MPM BIOIMPACT LLC

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 32

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 457,706 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · derivative.underlying_shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F9 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2018 LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 31

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 24,944 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · derivative.underlying_shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F8 · ownership.nature: These securities are owned directly by MPM Asset Management Investors BV 2014 LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 30

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 48,336 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · derivative.underlying_shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F7 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2014 (B) LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 29

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 724,702 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · derivative.underlying_shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F6 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2014 LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 28

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 1,397,574 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · derivative.underlying_shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F12 · ownership.nature: These securities are owned directly by UBS Oncology. MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the managing director of Oncology GP LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 27

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 15,820 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · derivative.underlying_shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F11 · ownership.nature: These securities are owned directly by MPM Asset Management Investors BV 2018 LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 26

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 42,605 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · derivative.underlying_shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F10 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2018 (B) LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 25

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 801,619 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · derivative.underlying_shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F9 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2018 LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 24

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 43,687 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · derivative.underlying_shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F8 · ownership.nature: These securities are owned directly by MPM Asset Management Investors BV 2014 LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 23

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 84,655 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · derivative.underlying_shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F7 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2014 (B) LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · derivative · entry 22

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 1,269,230 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.exercise_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.exercise_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.exercise_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · derivative.expiration_date: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.expiration_date: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.expiration_date: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.expiration_date: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F1 · derivative.underlying_shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · derivative.underlying_shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · derivative.underlying_shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · derivative.underlying_shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · derivative.underlying_shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F6 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2014 LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 21

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,355,557

F20 · shares: On July 28, 2020, UBS Oncology purchased 160,000 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

F20 · ownership.nature: On July 28, 2020, UBS Oncology purchased 160,000 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 20

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 25,974

F19 · shares: On July 28, 2020, MPM Asset Management Investors BV 2018 LLC purchased 1,121 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

F19 · ownership.nature: On July 28, 2020, MPM Asset Management Investors BV 2018 LLC purchased 1,121 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 19

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 69,951

F18 · shares: On July 28, 2020, MPM Bio Ventures 2018 (B) LP purchased 3,020 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

F18 · ownership.nature: On July 28, 2020, MPM Bio Ventures 2018 (B) LP purchased 3,020 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 18

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,316,139

F17 · shares: On July 28, 2020, MPM Bio Ventures 2018 LP purchased 56,814 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

F17 · ownership.nature: On July 28, 2020, MPM Bio Ventures 2018 LP purchased 56,814 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 17

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 71,727

F16 · shares: On July 28, 2020, MPM Asset Management Investors BV 2014 LLC purchased 3,096 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

F16 · ownership.nature: On July 28, 2020, MPM Asset Management Investors BV 2014 LLC purchased 3,096 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 16

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 138,985

F15 · shares: On July 28, 2020, MPM Bio Ventures 2014 (B) LP purchased 5,994 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

F15 · ownership.nature: On July 28, 2020, MPM Bio Ventures 2014 (B) LP purchased 5,994 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 15

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,083,887

F14 · shares: On July 28, 2020, MPM Bio Ventures 2014 LP purchased 89,955 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

F14 · ownership.nature: On July 28, 2020, MPM Bio Ventures 2014 LP purchased 89,955 shares of Common Stock of the Issuer at a price of $19.00 per share pursuant to an underwritten public offering.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 14

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,195,557

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F12 · ownership.nature: These securities are owned directly by UBS Oncology. MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the managing director of Oncology GP LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 13

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 24,853

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F11 · ownership.nature: These securities are owned directly by MPM Asset Management Investors BV 2018 LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 12

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 66,931

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F10 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2018 (B) LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 11

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,259,325

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F9 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2018 LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 10

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 68,381

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F8 · ownership.nature: These securities are owned directly by MPM Asset Management Investors BV 2014 LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 9

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 132,991

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F7 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2014 (B) LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 8

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,993,932

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F13 · shares: Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F6 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2014 LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 7

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,397,574

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F12 · ownership.nature: These securities are owned directly by UBS Oncology. MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the managing director of Oncology GP LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 6

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 15,820

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F11 · ownership.nature: These securities are owned directly by MPM Asset Management Investors BV 2018 LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 5

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 42,605

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F10 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2018 (B) LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 4

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 801,619

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F9 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2018 LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 3

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 43,687

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F8 · ownership.nature: These securities are owned directly by MPM Asset Management Investors BV 2014 LLC. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 2

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 84,655

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F7 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2014 (B) LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0000899243-20-020725 · doc4.xml · nonDerivative · entry 1

GADICKE ANSBERT · CIK 0001134655 · Director · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · X*

MPM Oncology Impact Management GP LLC · CIK 0001721035 · X*

MPM Oncology Impact Management LP · CIK 0001687078 · X*

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · X*

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,269,230

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each share of Series B Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date.

F2 · shares: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · shares: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · shares: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · shares: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F2 · price: The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 1,269,230 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 84,655 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 43,687 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 801,619 shares of Common Stock upon the closing of the Issuer's initial public offering.

F3 · price: (Continued From footnote 2) The shares of Series B Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 42,605 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 15,820 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B Convertible Preferred stock held by UBS Oncology Impact Fund LP will convert automatically into 1,397,574 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 LP will convert automatically into 724,702 shares of Common Stock upon the closing of the Issuer's initial public offering.

F4 · price: (Continued From footnote 3) The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2014 (B) LP will convert automatically into 48,336 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2014 LLC will convert automatically into 24,944 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 LP will convert automatically into 457,706 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MPM Bio Ventures 2018 (B) LP will convert automatically into 24,326 shares of Common Stock upon the closing of the Issuer's initial public offering.

F5 · price: (Continued From footnote 4) The shares of Series B-2 Convertible Preferred stock held by MPM Asset Management Investors BV 2018 LLC will convert automatically into 9,033 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by UBS Oncology Impact Fund LP ("UBS Oncology") will convert automatically into 797,983 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020.

F6 · ownership.nature: These securities are owned directly by MPM Bio Ventures 2014 LP. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein

SEC source: 0001209191-19-012247 · doc4.xml · derivative · entry 5

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 282,540 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: All shares of Series A Preferred Stock and Series B Preferred Stock automatically converted into the number of shares of the Issuer's common stock on a 6.1938:1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and had no expiration date.

F1 · derivative.exercise_date: All shares of Series A Preferred Stock and Series B Preferred Stock automatically converted into the number of shares of the Issuer's common stock on a 6.1938:1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and had no expiration date.

F1 · derivative.expiration_date: All shares of Series A Preferred Stock and Series B Preferred Stock automatically converted into the number of shares of the Issuer's common stock on a 6.1938:1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and had no expiration date.

SEC source: 0001209191-19-012247 · doc4.xml · derivative · entry 4

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,421,775 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: All shares of Series A Preferred Stock and Series B Preferred Stock automatically converted into the number of shares of the Issuer's common stock on a 6.1938:1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and had no expiration date.

F1 · derivative.exercise_date: All shares of Series A Preferred Stock and Series B Preferred Stock automatically converted into the number of shares of the Issuer's common stock on a 6.1938:1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and had no expiration date.

F1 · derivative.expiration_date: All shares of Series A Preferred Stock and Series B Preferred Stock automatically converted into the number of shares of the Issuer's common stock on a 6.1938:1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and had no expiration date.

SEC source: 0001209191-19-012247 · doc4.xml · nonDerivative · entry 3

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,370,982

F2 · ownership.direct: The reported securities are held in the account of UBS Oncology Impact Fund L.P. ("UBS Oncology"). MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the managing director of Oncology GP LLC.

F3 · ownership.direct: The Reporting Persons disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.

SEC source: 0001209191-19-012247 · doc4.xml · nonDerivative · entry 2

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,704,315

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: All shares of Series A Preferred Stock and Series B Preferred Stock automatically converted into the number of shares of the Issuer's common stock on a 6.1938:1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and had no expiration date.

F2 · ownership.direct: The reported securities are held in the account of UBS Oncology Impact Fund L.P. ("UBS Oncology"). MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the managing director of Oncology GP LLC.

F3 · ownership.direct: The Reporting Persons disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.

SEC source: 0001209191-19-012247 · doc4.xml · nonDerivative · entry 1

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,421,775

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: All shares of Series A Preferred Stock and Series B Preferred Stock automatically converted into the number of shares of the Issuer's common stock on a 6.1938:1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and had no expiration date.

F2 · ownership.direct: The reported securities are held in the account of UBS Oncology Impact Fund L.P. ("UBS Oncology"). MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the managing director of Oncology GP LLC.

F3 · ownership.direct: The Reporting Persons disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.

SEC source: 0001209191-19-010320 · doc4.xml · derivative · entry 11

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 50,838 shares

Expires 2027-01-10

F4 · kind: On February 12, 2019, UBS Oncology exercised warrants to purchase an aggregate of 127,096 shares of the Issuer's common stock for $0.0492 per share. UBS Oncology paid the exercise price on a cashless basis, resulting in the Issuer's withholding of 447 of the warrant shares to pay the exercise price and issuing to UBS Oncology the remaining 126,649 shares.

SEC source: 0001209191-19-010320 · doc4.xml · derivative · entry 10

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 76,258 shares

Expires 2026-11-01

F4 · kind: On February 12, 2019, UBS Oncology exercised warrants to purchase an aggregate of 127,096 shares of the Issuer's common stock for $0.0492 per share. UBS Oncology paid the exercise price on a cashless basis, resulting in the Issuer's withholding of 447 of the warrant shares to pay the exercise price and issuing to UBS Oncology the remaining 126,649 shares.

SEC source: 0001209191-19-010320 · doc4.xml · derivative · entry 9

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 417,853 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

F1 · derivative.exercise_date: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

F1 · derivative.expiration_date: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

SEC source: 0001209191-19-010320 · doc4.xml · derivative · entry 8

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,578,755 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

F1 · derivative.exercise_date: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

F1 · derivative.expiration_date: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

SEC source: 0001209191-19-010320 · doc4.xml · derivative · entry 7

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,525,165 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

F1 · derivative.exercise_date: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

F1 · derivative.expiration_date: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

SEC source: 0001209191-19-010320 · doc4.xml · nonDerivative · entry 6

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,898,422

F2 · ownership.direct: The reported securities are held in the account of UBS Oncology Impact Fund L.P. ("UBS Oncology"). MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the Managing Member of Oncology GP LLC.

F3 · ownership.direct: The Reporting Persons disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.

SEC source: 0001209191-19-010320 · doc4.xml · nonDerivative · entry 5

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,648,422

F4 · kind: On February 12, 2019, UBS Oncology exercised warrants to purchase an aggregate of 127,096 shares of the Issuer's common stock for $0.0492 per share. UBS Oncology paid the exercise price on a cashless basis, resulting in the Issuer's withholding of 447 of the warrant shares to pay the exercise price and issuing to UBS Oncology the remaining 126,649 shares.

F2 · ownership.direct: The reported securities are held in the account of UBS Oncology Impact Fund L.P. ("UBS Oncology"). MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the Managing Member of Oncology GP LLC.

F3 · ownership.direct: The Reporting Persons disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.

SEC source: 0001209191-19-010320 · doc4.xml · nonDerivative · entry 4

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,648,869

F4 · kind: On February 12, 2019, UBS Oncology exercised warrants to purchase an aggregate of 127,096 shares of the Issuer's common stock for $0.0492 per share. UBS Oncology paid the exercise price on a cashless basis, resulting in the Issuer's withholding of 447 of the warrant shares to pay the exercise price and issuing to UBS Oncology the remaining 126,649 shares.

F2 · ownership.direct: The reported securities are held in the account of UBS Oncology Impact Fund L.P. ("UBS Oncology"). MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the Managing Member of Oncology GP LLC.

F3 · ownership.direct: The Reporting Persons disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.

SEC source: 0001209191-19-010320 · doc4.xml · nonDerivative · entry 3

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,521,773

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

F2 · ownership.direct: The reported securities are held in the account of UBS Oncology Impact Fund L.P. ("UBS Oncology"). MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the Managing Member of Oncology GP LLC.

F3 · ownership.direct: The Reporting Persons disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.

SEC source: 0001209191-19-010320 · doc4.xml · nonDerivative · entry 2

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,103,920

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

F2 · ownership.direct: The reported securities are held in the account of UBS Oncology Impact Fund L.P. ("UBS Oncology"). MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the Managing Member of Oncology GP LLC.

F3 · ownership.direct: The Reporting Persons disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.

SEC source: 0001209191-19-010320 · doc4.xml · nonDerivative · entry 1

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,525,165

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 1-for-1 basis, for no additional consideration, immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

F2 · ownership.direct: The reported securities are held in the account of UBS Oncology Impact Fund L.P. ("UBS Oncology"). MPM Oncology Impact Management GP LLC ("Oncology GP LLC") is the General Partner of MPM Oncology Impact Management LP, the General Partner of Oncology Impact Fund (Cayman) Management L.P., the General Partner of UBS Oncology. Ansbert Gadicke is the Managing Member of Oncology GP LLC.

F3 · ownership.direct: The Reporting Persons disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.

SEC source: 0001140361-17-041187 · doc1.xml · nonDerivative · entry 3

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 3,331,500

F1 · ownership.nature: MPM Oncology Impact Management GP LLC ("MPM GP") is the general partner of MPM Oncology Impact Management LP ("MPM Management"), which is the general partner of Oncology Impact Fund (Cayman) Management L.P. ("MPM Cayman"), which is the general partner of UBS Oncology Impact Fund L.P. ("UBS Oncology"). The reported securities are owned indirectly by MPM GP, MPM Management and MPM Cayman, and are owned directly by UBS Oncology.

SEC source: 0001140361-17-041187 · doc1.xml · nonDerivative · entry 2

MPM Oncology Impact Management GP LLC · CIK 0001721035 · 10% owner

MPM Oncology Impact Management LP · CIK 0001687078 · 10% owner

Oncology Impact Fund (Cayman) Management L.P. · CIK 0001721036 · 10% owner

UBS Oncology Impact Fund L.P. · CIK 0001691428 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 3,315,300

F1 · ownership.nature: MPM Oncology Impact Management GP LLC ("MPM GP") is the general partner of MPM Oncology Impact Management LP ("MPM Management"), which is the general partner of Oncology Impact Fund (Cayman) Management L.P. ("MPM Cayman"), which is the general partner of UBS Oncology Impact Fund L.P. ("UBS Oncology"). The reported securities are owned indirectly by MPM GP, MPM Management and MPM Cayman, and are owned directly by UBS Oncology.