MDGL

SEC source: 0001209191-23-058691 · doc4.xml · nonDerivative · entry 1

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 175,915

F1 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, L.P. ("667"), Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in common stock ("Common Stock") of Madrigal Pharmaceuticals, Inc. (the "Issuer") reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F2 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to 667 and Baker Brothers Life Sciences, L.P. ("Life Sciences", and together with 667, the "Funds"). In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F3 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F4 · ownership.nature: Includes beneficial ownership of 2,396 previously issued restricted stock units (each, an "RSU") payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on the board of directors of the Issuer and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the RSUs. Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

SEC source: 0000950170-23-070416 · ownership.xml · derivative · entry 7

Waltermire Robert E. · CIK 0001876996 · Senior VP, Chief Pharma Dev.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,700

Underlying: Common Stock · 1,300 shares

Expires 2031-08-02

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_date: All shares issued pursuant to the exercise of the options reported herein represent 3,800 shares underlying an overall option award of 35,000 shares. All exercised options had vested. As to the overall option for 35,000 shares, 25% of the shares underlying the option vested on August 2, 2022 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0000950170-23-070416 · ownership.xml · nonDerivative · entry 3

Waltermire Robert E. · CIK 0001876996 · Senior VP, Chief Pharma Dev.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,667

SEC source: 0000950170-23-070416 · ownership.xml · nonDerivative · entry 2

Waltermire Robert E. · CIK 0001876996 · Senior VP, Chief Pharma Dev.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,467

SEC source: 0000950170-23-070416 · ownership.xml · nonDerivative · entry 1

Waltermire Robert E. · CIK 0001876996 · Senior VP, Chief Pharma Dev.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,967

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 · kind: All shares issued pursuant to the exercise of the options reported herein represent 3,800 shares underlying an overall option award of 35,000 shares. All exercised options had vested. As to the overall option for 35,000 shares, 25% of the shares underlying the option vested on August 2, 2022 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0000899243-23-020582 · doc4.xml · nonDerivative · entry 2

CRAVES FRED B · CIK 0001014095 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,261

F6 · kind: Represents transfers, without the payment of any consideration, to their partners and employees.

F7 · shares: Includes 46,073 shares of Common Stock previously reported as indirectly held by Fund IV.

F1 · ownership.nature: Bay City Capital LLC, a Delaware limited liability company ("BCC"), Bay City Capital Management IV LLC, a Delaware limited liability company ("Management IV"), and Bay City Capital Fund IV, L.P., a Delaware limited partnership ("Fund IV"), are deemed to be a "group" for the purposes of Section 13(d) under the Securities Exchange Act of 1934. Management IV is the general partner of Fund IV and has sole voting and dispositive power with respect to the securities held by Fund IV. BCC, the manager of Management IV, is also an advisor to Fund IV and has sole voting and dispositive power with respect to the securities held by Fund IV.

F3 · ownership.nature: These securities are held by BCC. Dr. Craves disclaims beneficial ownership of these securities held by BCC, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such shares, except to the extent of his pecuniary interest, if any, in the securities by virtue of the limited liability company interests he owns in BCC.

SEC source: 0000899243-23-020582 · doc4.xml · nonDerivative · entry 1

CRAVES FRED B · CIK 0001014095 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F6 · kind: Represents transfers, without the payment of any consideration, to their partners and employees.

F1 · ownership.nature: Bay City Capital LLC, a Delaware limited liability company ("BCC"), Bay City Capital Management IV LLC, a Delaware limited liability company ("Management IV"), and Bay City Capital Fund IV, L.P., a Delaware limited partnership ("Fund IV"), are deemed to be a "group" for the purposes of Section 13(d) under the Securities Exchange Act of 1934. Management IV is the general partner of Fund IV and has sole voting and dispositive power with respect to the securities held by Fund IV. BCC, the manager of Management IV, is also an advisor to Fund IV and has sole voting and dispositive power with respect to the securities held by Fund IV.

F2 · ownership.nature: These securities were held by Fund IV. Dr. Craves disclaims beneficial ownership of these securities previously held by Fund IV, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such shares, except to the extent of his pecuniary interest, if any, in the securities by virtue of the limited liability company interests he owns in BCC.

SEC source: 0000950170-23-068575 · ownership.xml · derivative · entry 10

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,000

Underlying: Common Stock · 800 shares

Expires 2032-02-22

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_date: All shares issued pursuant to the exercise of this option represent 2,000 shares underlying an overall option award of 45,000 shares. All exercised options had vested. As to the overall option for 45,000 shares, 25% of the shares underlying the option vested on February 22, 2023 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0000950170-23-068575 · ownership.xml · nonDerivative · entry 6

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,001

SEC source: 0000950170-23-068575 · ownership.xml · nonDerivative · entry 5

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,001

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 · kind: All shares issued pursuant to the exercise of this option represent 2,000 shares underlying an overall option award of 45,000 shares. All exercised options had vested. As to the overall option for 45,000 shares, 25% of the shares underlying the option vested on February 22, 2023 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0000950170-23-068575 · ownership.xml · derivative · entry 9

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,000

Underlying: Common Stock · 1,000 shares

Expires 2032-02-22

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_date: All shares issued pursuant to the exercise of this option represent 2,000 shares underlying an overall option award of 45,000 shares. All exercised options had vested. As to the overall option for 45,000 shares, 25% of the shares underlying the option vested on February 22, 2023 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0000950170-23-068575 · ownership.xml · derivative · entry 8

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,200

Underlying: Common Stock · 1,000 shares

Expires 2032-08-10

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_date: All shares issued pursuant to the exercise of this option represent 800 shares underlying an overall option award of 25,000 shares. All exercised options had vested. As to the overall option for 25,000 shares, 25% of the shares underlying the option vested on August 10, 2023 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0000950170-23-068575 · ownership.xml · nonDerivative · entry 4

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,001

SEC source: 0000950170-23-068575 · ownership.xml · nonDerivative · entry 3

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,001

SEC source: 0000950170-23-068575 · ownership.xml · nonDerivative · entry 2

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,801

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 · kind: All shares issued pursuant to the exercise of this option represent 2,000 shares underlying an overall option award of 45,000 shares. All exercised options had vested. As to the overall option for 45,000 shares, 25% of the shares underlying the option vested on February 22, 2023 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0000950170-23-068575 · ownership.xml · nonDerivative · entry 1

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,801

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 · kind: All shares issued pursuant to the exercise of this option represent 800 shares underlying an overall option award of 25,000 shares. All exercised options had vested. As to the overall option for 25,000 shares, 25% of the shares underlying the option vested on August 10, 2023 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0000950170-23-067360 · ownership.xml · derivative · entry 10

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,000

Underlying: Common Stock · 3,000 shares

Expires 2032-08-10

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_date: All shares issued pursuant to the exercise of the options reported herein represent 7,000 shares underlying an overall option award of 25,000 shares. All exercised options had vested. As to the overall option for 25,000 shares, 25% of the shares underlying the option vested on August 10, 2023 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0000950170-23-067360 · ownership.xml · nonDerivative · entry 7

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,001

SEC source: 0000950170-23-067360 · ownership.xml · nonDerivative · entry 6

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,001

SEC source: 0000950170-23-067360 · ownership.xml · nonDerivative · entry 5

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,001

SEC source: 0000950170-23-067360 · ownership.xml · nonDerivative · entry 4

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,001

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.

SEC source: 0000950170-23-067360 · ownership.xml · derivative · entry 9

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,000

Underlying: Common Stock · 4,000 shares

Expires 2032-08-10

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_date: All shares issued pursuant to the exercise of the options reported herein represent 7,000 shares underlying an overall option award of 25,000 shares. All exercised options had vested. As to the overall option for 25,000 shares, 25% of the shares underlying the option vested on August 10, 2023 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0000950170-23-067360 · ownership.xml · nonDerivative · entry 3

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,001

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $199.25 to $199.59, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote

SEC source: 0000950170-23-067360 · ownership.xml · nonDerivative · entry 2

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,001

SEC source: 0000950170-23-067360 · ownership.xml · nonDerivative · entry 1

Lynch Brian Joseph · CIK 0001776196 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,001

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 · kind: All shares issued pursuant to the exercise of the options reported herein represent 7,000 shares underlying an overall option award of 25,000 shares. All exercised options had vested. As to the overall option for 25,000 shares, 25% of the shares underlying the option vested on August 10, 2023 and, thereafter, 6.25% of the shares vested, or will vest, on the last day of each successive three-month period, provided the Reporting Person continues in service with the Issuer on each such date.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 20

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,667,104

F16 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $189.52 to $190.50, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F8 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 19

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 175,908

F16 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $189.52 to $190.50, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 18

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,659,187

F15 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $188.47 to $189.46, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F8 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 17

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 175,253

F15 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $188.47 to $189.46, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 16

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,643,567

F14 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $187.85 to $188.84, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F8 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 15

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 173,962

F14 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $187.85 to $188.84, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 14

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,630,062

F13 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $188.14 to $188.46, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F8 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 13

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 172,845

F13 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $188.14 to $188.46, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 12

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,617,051

F12 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $186.91 to $187.81, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F8 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 11

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 171,769

F12 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $186.91 to $187.81, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 10

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,612,339

F11 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $186.80 to $187.57, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F8 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 9

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 171,381

F11 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $186.80 to $187.57, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 8

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,610,215

F10 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $186.40 to $186.75, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F8 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 7

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 171,205

F10 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $186.40 to $186.75, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 6

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,608,830

F9 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $186.06 to $186.43, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F8 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 5

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 171,090

F9 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $186.06 to $186.43, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 4

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,608,183

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F8 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 3

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 171,037

F2 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 2

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,607,814

F1 · price: The price reported in Column 4 is a weighted average price. These shares of common stock ("Common Stock") of Madrigal Pharmaceuticals, Inc. (the "Issuer") were traded by 667, L.P. ("667") and Baker Brothers Life Sciences, L.P. ("Life Sciences", and together with 667, the "Funds") in multiple transactions at prices ranging from $185.87 to $186.17, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission (the "Staff"), upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F8 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056364 · doc4.xml · nonDerivative · entry 1

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 171,006

F1 · price: The price reported in Column 4 is a weighted average price. These shares of common stock ("Common Stock") of Madrigal Pharmaceuticals, Inc. (the "Issuer") were traded by 667, L.P. ("667") and Baker Brothers Life Sciences, L.P. ("Life Sciences", and together with 667, the "Funds") in multiple transactions at prices ranging from $185.87 to $186.17, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission (the "Staff"), upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F3 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to the Funds. In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F4 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on board of directors of the Issuer (the "Board") and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the restricted stock units (each, an "RSU"). Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: Includes beneficial ownership of 2,396 previously issued RSUs payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

SEC source: 0001209191-23-056363 · doc4.xml · nonDerivative · entry 30

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,607,668

F17 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $189.69 to $189.73, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to 667 and Baker Brothers Life Sciences, L.P. ("Life Sciences", and together with 667, the "Funds"). In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F3 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F4 · ownership.nature: Includes beneficial ownership of 2,396 previously issued restricted stock units (each, an "RSU") payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on the board of directors of the Issuer and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the RSUs. Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056363 · doc4.xml · nonDerivative · entry 29

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 170,994

F17 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $189.69 to $189.73, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F1 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, L.P. ("667"), Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in common stock ("Common Stock") of Madrigal Pharmaceuticals, Inc. (the "Issuer") reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F2 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to 667 and Baker Brothers Life Sciences, L.P. ("Life Sciences", and together with 667, the "Funds"). In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F3 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F4 · ownership.nature: Includes beneficial ownership of 2,396 previously issued restricted stock units (each, an "RSU") payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on the board of directors of the Issuer and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the RSUs. Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

SEC source: 0001209191-23-056363 · doc4.xml · nonDerivative · entry 28

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,604,646

F16 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $188.46 to $189.00, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F2 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to 667 and Baker Brothers Life Sciences, L.P. ("Life Sciences", and together with 667, the "Funds"). In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F3 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F4 · ownership.nature: Includes beneficial ownership of 2,396 previously issued restricted stock units (each, an "RSU") payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on the board of directors of the Issuer and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the RSUs. Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.

SEC source: 0001209191-23-056363 · doc4.xml · nonDerivative · entry 27

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 170,744

F16 · price: The price reported in Column 4 is a weighted average price. These shares were traded by 667 and Life Sciences in multiple transactions at prices ranging from $188.46 to $189.00, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff, upon request, full information regarding the number of shares traded at each separate price within the range set forth in this footnote.

F1 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Biotech Capital, L.P. and (ii) 667, L.P. ("667"), Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in common stock ("Common Stock") of Madrigal Pharmaceuticals, Inc. (the "Issuer") reported in column 5 of Table I held directly by or held for the benefit of 667, a limited partnership of which the sole general partner is Baker Biotech Capital, L.P., a limited partnership of which the sole general partner is Baker Biotech Capital (GP), LLC, due to their interest in 667 and Baker Biotech Capital, L.P.'s right to receive an allocation of a portion of the profits from 667.

F2 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to 667 and Baker Brothers Life Sciences, L.P. ("Life Sciences", and together with 667, the "Funds"). In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F3 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F4 · ownership.nature: Includes beneficial ownership of 2,396 previously issued restricted stock units (each, an "RSU") payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on the board of directors of the Issuer and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the RSUs. Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

SEC source: 0001209191-23-056363 · doc4.xml · nonDerivative · entry 26

BAKER BROS. ADVISORS LP · CIK 0001263508 · Director

667, L.P. · CIK 0001551139 · Director

BAKER JULIAN · CIK 0001087939 · Director

BAKER FELIX · CIK 0001087940 · Director

Baker Bros. Advisors (GP) LLC · CIK 0001580575 · Director

Baker Brothers Life Sciences LP · CIK 0001363364 · Director

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,603,499

F2 · ownership.nature: Baker Bros. Advisors LP (the "Adviser") serves as the investment adviser to 667 and Baker Brothers Life Sciences, L.P. ("Life Sciences", and together with 667, the "Funds"). In connection with the services provided by the Adviser, the Adviser receives an asset-based management fee that does not confer any pecuniary interest in the securities held directly by the Funds or for the benefit of the Funds. Baker Bros. Advisors (GP) LLC (the "Adviser GP") is the Adviser's sole general partner. Julian C. Baker and Felix J. Baker are managing members of the Adviser GP. The Adviser has complete and unlimited discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds. The general partners of the Funds relinquished to the Adviser all discretion and authority with respect to the investment and voting power of the securities held directly by the Funds or for the benefit of the Funds.

F3 · ownership.nature: Julian C. Baker, Felix J. Baker, the Adviser GP and the Adviser disclaim beneficial ownership of the securities held directly by the Funds or for the benefit of the Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Julian C. Baker, Felix J. Baker, the Adviser GP or the Adviser is a beneficial owner of such securities for purposes of Section 16 or any other purpose.

F4 · ownership.nature: Includes beneficial ownership of 2,396 previously issued restricted stock units (each, an "RSU") payable solely in Common Stock issued to each of Julian C. Baker, a managing member of the Adviser GP and Dr. Raymond Cheong, an employee of the Adviser, in their capacity as directors of the Issuer pursuant to the Issuer's Amended 2015 Stock Plan ("2015 Plan") of which the Funds may be deemed to own a portion.

F5 · ownership.nature: Pursuant to the policies of the Adviser, Julian C. Baker and Dr. Cheong do not have a right to any of the Issuer's securities issued as compensation for their service on the board of directors of the Issuer and the Funds are entitled to an indirect proportionate pecuniary interest in the securities. The Funds each own an indirect proportionate pecuniary interest in the RSUs. Solely as a result of their ownership interest in (i) the general partners of the Funds and (ii) the Funds, Felix J. Baker and Julian C. Baker may be deemed to have an indirect pecuniary interest in the RSUs and any Common Stock acquired upon the vesting of RSUs (i.e. no direct pecuniary interest).

F6 · ownership.nature: Pursuant to agreements between Julian C. Baker, Dr. Cheong and the Adviser and the policies of the Adviser, the Adviser has voting and dispositive power over the RSUs and any Common Stock received as a result of the vesting of RSUs.

F7 · ownership.nature: After giving effect to the transactions reported herein and as a result of their ownership interest in (i) Baker Brothers Life Sciences Capital, L.P. and (ii) Life Sciences, Julian C. Baker and Felix J. Baker each may be deemed to have an indirect pecuniary interest in Common Stock reported in column 5 of Table I held directly by or held for the benefit of Life Sciences, a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital, L.P., a limited partnership of which the sole general partner is Baker Brothers Life Sciences Capital (GP), LLC, due to their interest in Life Sciences and Baker Brothers Life Sciences Capital, L.P.'s right to receive an allocation of a portion of the profits from Life Sciences.