SANA

SEC source: 0000899243-21-005752 · doc4.xml · derivative · entry 6

ARCH Venture Fund X, L.P. · CIK 0001757011 · 10% owner

ARCH Venture Fund IX, L.P. · CIK 0001666306 · 10% owner

ARCH Venture Fund IX Overage, L.P. · CIK 0001666307 · 10% owner

ARCH Venture Fund X Overage, L.P. · CIK 0001757017 · 10% owner

ARCH Venture Partners IX, L.P. · CIK 0001723173 · 10% owner

ARCH Venture Partners IX Overage, L.P. · CIK 0001723172 · 10% owner

ARCH Venture Partners X, L.P. · CIK 0001782583 · 10% owner

ARCH Venture Partners X Overage, L.P. · CIK 0001768905 · 10% owner

ARCH Venture Partners IX, LLC · CIK 0001723174 · 10% owner

ARCH Venture Partners X, LLC · CIK 0001769012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 3,687,500 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically converted into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically converted into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F8 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F3 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX Overage, L.P. (ARCH IX Overage). ARCH Venture Partners IX Overage, L.P. (AVP IX Overage LP) is the sole general partner of ARCH IX Overage.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

SEC source: 0000899243-21-005752 · doc4.xml · derivative · entry 5

ARCH Venture Fund X, L.P. · CIK 0001757011 · 10% owner

ARCH Venture Fund IX, L.P. · CIK 0001666306 · 10% owner

ARCH Venture Fund IX Overage, L.P. · CIK 0001666307 · 10% owner

ARCH Venture Fund X Overage, L.P. · CIK 0001757017 · 10% owner

ARCH Venture Partners IX, L.P. · CIK 0001723173 · 10% owner

ARCH Venture Partners IX Overage, L.P. · CIK 0001723172 · 10% owner

ARCH Venture Partners X, L.P. · CIK 0001782583 · 10% owner

ARCH Venture Partners X Overage, L.P. · CIK 0001768905 · 10% owner

ARCH Venture Partners IX, LLC · CIK 0001723174 · 10% owner

ARCH Venture Partners X, LLC · CIK 0001769012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 3,687,500 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically converted into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically converted into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F8 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F2 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX, L.P. (ARCH IX). ARCH Venture Partners IX, L.P. (AVP IX LP) is the sole general partner of ARCH IX.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

SEC source: 0000899243-21-005752 · doc4.xml · nonDerivative · entry 4

ARCH Venture Fund X, L.P. · CIK 0001757011 · 10% owner

ARCH Venture Fund IX, L.P. · CIK 0001666306 · 10% owner

ARCH Venture Fund IX Overage, L.P. · CIK 0001666307 · 10% owner

ARCH Venture Fund X Overage, L.P. · CIK 0001757017 · 10% owner

ARCH Venture Partners IX, L.P. · CIK 0001723173 · 10% owner

ARCH Venture Partners IX Overage, L.P. · CIK 0001723172 · 10% owner

ARCH Venture Partners X, L.P. · CIK 0001782583 · 10% owner

ARCH Venture Partners X Overage, L.P. · CIK 0001768905 · 10% owner

ARCH Venture Partners IX, LLC · CIK 0001723174 · 10% owner

ARCH Venture Partners X, LLC · CIK 0001769012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 11,718,750

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

F1 · price: The shares of Issuer's Preferred Stock automatically converted into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F6 · ownership.nature: Represents shares held directly by ARCH Venture Fund X Overage, L.P. (ARCH X Overage). ARCH Venture Partners X Overage, L.P. (AVP X Overage LP) is the sole general partner of ARCH X Overage.

F7 · ownership.nature: ARCH Venture Partners X, LLC (AVP X LLC) is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow and Steven Gillis are members of the investment committee of AVP X LLC (the AVP X Committee Members). AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members each disclaim beneficial ownership except to the extent of any pecuniary interest therein.

SEC source: 0000899243-21-005752 · doc4.xml · nonDerivative · entry 3

ARCH Venture Fund X, L.P. · CIK 0001757011 · 10% owner

ARCH Venture Fund IX, L.P. · CIK 0001666306 · 10% owner

ARCH Venture Fund IX Overage, L.P. · CIK 0001666307 · 10% owner

ARCH Venture Fund X Overage, L.P. · CIK 0001757017 · 10% owner

ARCH Venture Partners IX, L.P. · CIK 0001723173 · 10% owner

ARCH Venture Partners IX Overage, L.P. · CIK 0001723172 · 10% owner

ARCH Venture Partners X, L.P. · CIK 0001782583 · 10% owner

ARCH Venture Partners X Overage, L.P. · CIK 0001768905 · 10% owner

ARCH Venture Partners IX, LLC · CIK 0001723174 · 10% owner

ARCH Venture Partners X, LLC · CIK 0001769012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 11,718,750

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

F1 · price: The shares of Issuer's Preferred Stock automatically converted into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F5 · ownership.nature: Represents shares held directly by ARCH Venture Fund X, L.P. (ARCH X). ARCH Venture Partners X, L.P. (AVP X LP) is the sole general partner of ARCH X.

F7 · ownership.nature: ARCH Venture Partners X, LLC (AVP X LLC) is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow and Steven Gillis are members of the investment committee of AVP X LLC (the AVP X Committee Members). AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members each disclaim beneficial ownership except to the extent of any pecuniary interest therein.

SEC source: 0000899243-21-005752 · doc4.xml · nonDerivative · entry 2

ARCH Venture Fund X, L.P. · CIK 0001757011 · 10% owner

ARCH Venture Fund IX, L.P. · CIK 0001666306 · 10% owner

ARCH Venture Fund IX Overage, L.P. · CIK 0001666307 · 10% owner

ARCH Venture Fund X Overage, L.P. · CIK 0001757017 · 10% owner

ARCH Venture Partners IX, L.P. · CIK 0001723173 · 10% owner

ARCH Venture Partners IX Overage, L.P. · CIK 0001723172 · 10% owner

ARCH Venture Partners X, L.P. · CIK 0001782583 · 10% owner

ARCH Venture Partners X Overage, L.P. · CIK 0001768905 · 10% owner

ARCH Venture Partners IX, LLC · CIK 0001723174 · 10% owner

ARCH Venture Partners X, LLC · CIK 0001769012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 10,301,250

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

F1 · price: The shares of Issuer's Preferred Stock automatically converted into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F3 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX Overage, L.P. (ARCH IX Overage). ARCH Venture Partners IX Overage, L.P. (AVP IX Overage LP) is the sole general partner of ARCH IX Overage.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

SEC source: 0000899243-21-005752 · doc4.xml · nonDerivative · entry 1

ARCH Venture Fund X, L.P. · CIK 0001757011 · 10% owner

ARCH Venture Fund IX, L.P. · CIK 0001666306 · 10% owner

ARCH Venture Fund IX Overage, L.P. · CIK 0001666307 · 10% owner

ARCH Venture Fund X Overage, L.P. · CIK 0001757017 · 10% owner

ARCH Venture Partners IX, L.P. · CIK 0001723173 · 10% owner

ARCH Venture Partners IX Overage, L.P. · CIK 0001723172 · 10% owner

ARCH Venture Partners X, L.P. · CIK 0001782583 · 10% owner

ARCH Venture Partners X Overage, L.P. · CIK 0001768905 · 10% owner

ARCH Venture Partners IX, LLC · CIK 0001723174 · 10% owner

ARCH Venture Partners X, LLC · CIK 0001769012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 10,303,750

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

F1 · price: The shares of Issuer's Preferred Stock automatically converted into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX, L.P. (ARCH IX). ARCH Venture Partners IX, L.P. (AVP IX LP) is the sole general partner of ARCH IX.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

SEC source: 0000899243-21-005747 · doc4.xml · derivative · entry 8

Flagship Ventures Fund V General Partner LLC · CIK 0001724575 · 10% owner

Flagship V VentureLabs Rx Fund, L.P. · CIK 0001724939 · 10% owner

Flagship Ventures Fund V, L.P. · CIK 0001627639 · 10% owner

Flagship Pioneering Inc. · CIK 0001400240 · 10% owner

Flagship Pioneering Fund VI General Partner LLC · CIK 0001724957 · 10% owner

Flagship Pioneering Fund VI, L.P. · CIK 0001716926 · 10% owner

Flagship VentureLabs V Manager LLC · CIK 0001768987 · 10% owner

Flagship VentureLabs V LLC · CIK 0001724959 · 10% owner

AFEYAN NOUBAR · CIK 0001222012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Stock · 11,585,199 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F8 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F5 · ownership.nature: Represents shares held directly by Flagship Ventures Fund V, L.P. ("Flagship Fund V" and together with Flagship Fund V Rx, Flagship Pioneering VI, and VentureLabs V, the "Flagship Pioneering Funds").

F6 · ownership.nature: VentureLabs V Manager LLC ("VentureLabs V Manager") is the manager of VentureLabs V. Flagship Pioneering, Inc. ("Flagship Pioneering") is the manager of VentureLabs V Manager. The General Partner of Flagship Pioneering VI is Flagship Pioneering Fund VI General Partner LLC ("Flagship Pioneering VI GP"). The manager of Flagship Pioneering VI GP is Flagship Pioneering. The General Partner of Flagship Fund V and Flagship Fund V Rx is Flagship Ventures Fund V General Partner LLC ("Flagship V GP" and, together with VentureLabs V Manager, Flagship Pioneering, and Flagship Pioneering VI GP, the "Flagship General Partners").

F7 · ownership.nature: (continued from footnote 6) Noubar B. Afeyan, Ph.D. is the sole Director of Flagship Pioneering and may be deemed to have sole voting and investment control over all the shares held by VentureLabs V and Flagship Fund VI. In addition, Noubar B. Afeyan, Ph.D. serves as the sole manager of Flagship V GP and may be deemed to possess sole voting and investment control over all the shares held by Flagship Fund V and Flagship Fund V Rx. None of the Flagship General Partners nor Noubar B. Afeyan, Ph.D. directly own any of the shares held by the Flagship Pioneering Funds, and each of the Flagship General Partners and Noubar Afeyan, Ph.D. disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-005747 · doc4.xml · derivative · entry 7

Flagship Ventures Fund V General Partner LLC · CIK 0001724575 · 10% owner

Flagship V VentureLabs Rx Fund, L.P. · CIK 0001724939 · 10% owner

Flagship Ventures Fund V, L.P. · CIK 0001627639 · 10% owner

Flagship Pioneering Inc. · CIK 0001400240 · 10% owner

Flagship Pioneering Fund VI General Partner LLC · CIK 0001724957 · 10% owner

Flagship Pioneering Fund VI, L.P. · CIK 0001716926 · 10% owner

Flagship VentureLabs V Manager LLC · CIK 0001768987 · 10% owner

Flagship VentureLabs V LLC · CIK 0001724959 · 10% owner

AFEYAN NOUBAR · CIK 0001222012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Stock · 11,441,326 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F8 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F4 · ownership.nature: Represents shares held directly by Flagship VentureLabs V LLC. ("VentureLabs V").

F6 · ownership.nature: VentureLabs V Manager LLC ("VentureLabs V Manager") is the manager of VentureLabs V. Flagship Pioneering, Inc. ("Flagship Pioneering") is the manager of VentureLabs V Manager. The General Partner of Flagship Pioneering VI is Flagship Pioneering Fund VI General Partner LLC ("Flagship Pioneering VI GP"). The manager of Flagship Pioneering VI GP is Flagship Pioneering. The General Partner of Flagship Fund V and Flagship Fund V Rx is Flagship Ventures Fund V General Partner LLC ("Flagship V GP" and, together with VentureLabs V Manager, Flagship Pioneering, and Flagship Pioneering VI GP, the "Flagship General Partners").

F7 · ownership.nature: (continued from footnote 6) Noubar B. Afeyan, Ph.D. is the sole Director of Flagship Pioneering and may be deemed to have sole voting and investment control over all the shares held by VentureLabs V and Flagship Fund VI. In addition, Noubar B. Afeyan, Ph.D. serves as the sole manager of Flagship V GP and may be deemed to possess sole voting and investment control over all the shares held by Flagship Fund V and Flagship Fund V Rx. None of the Flagship General Partners nor Noubar B. Afeyan, Ph.D. directly own any of the shares held by the Flagship Pioneering Funds, and each of the Flagship General Partners and Noubar Afeyan, Ph.D. disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-005747 · doc4.xml · derivative · entry 6

Flagship Ventures Fund V General Partner LLC · CIK 0001724575 · 10% owner

Flagship V VentureLabs Rx Fund, L.P. · CIK 0001724939 · 10% owner

Flagship Ventures Fund V, L.P. · CIK 0001627639 · 10% owner

Flagship Pioneering Inc. · CIK 0001400240 · 10% owner

Flagship Pioneering Fund VI General Partner LLC · CIK 0001724957 · 10% owner

Flagship Pioneering Fund VI, L.P. · CIK 0001716926 · 10% owner

Flagship VentureLabs V Manager LLC · CIK 0001768987 · 10% owner

Flagship VentureLabs V LLC · CIK 0001724959 · 10% owner

AFEYAN NOUBAR · CIK 0001222012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Stock · 9,725,122 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F8 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F3 · ownership.nature: Represents shares held directly by Flagship Pioneering Fund VI, L.P. ("Flagship Pioneering VI").

F6 · ownership.nature: VentureLabs V Manager LLC ("VentureLabs V Manager") is the manager of VentureLabs V. Flagship Pioneering, Inc. ("Flagship Pioneering") is the manager of VentureLabs V Manager. The General Partner of Flagship Pioneering VI is Flagship Pioneering Fund VI General Partner LLC ("Flagship Pioneering VI GP"). The manager of Flagship Pioneering VI GP is Flagship Pioneering. The General Partner of Flagship Fund V and Flagship Fund V Rx is Flagship Ventures Fund V General Partner LLC ("Flagship V GP" and, together with VentureLabs V Manager, Flagship Pioneering, and Flagship Pioneering VI GP, the "Flagship General Partners").

F7 · ownership.nature: (continued from footnote 6) Noubar B. Afeyan, Ph.D. is the sole Director of Flagship Pioneering and may be deemed to have sole voting and investment control over all the shares held by VentureLabs V and Flagship Fund VI. In addition, Noubar B. Afeyan, Ph.D. serves as the sole manager of Flagship V GP and may be deemed to possess sole voting and investment control over all the shares held by Flagship Fund V and Flagship Fund V Rx. None of the Flagship General Partners nor Noubar B. Afeyan, Ph.D. directly own any of the shares held by the Flagship Pioneering Funds, and each of the Flagship General Partners and Noubar Afeyan, Ph.D. disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-005747 · doc4.xml · derivative · entry 5

Flagship Ventures Fund V General Partner LLC · CIK 0001724575 · 10% owner

Flagship V VentureLabs Rx Fund, L.P. · CIK 0001724939 · 10% owner

Flagship Ventures Fund V, L.P. · CIK 0001627639 · 10% owner

Flagship Pioneering Inc. · CIK 0001400240 · 10% owner

Flagship Pioneering Fund VI General Partner LLC · CIK 0001724957 · 10% owner

Flagship Pioneering Fund VI, L.P. · CIK 0001716926 · 10% owner

Flagship VentureLabs V Manager LLC · CIK 0001768987 · 10% owner

Flagship VentureLabs V LLC · CIK 0001724959 · 10% owner

AFEYAN NOUBAR · CIK 0001222012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Stock · 1,487,371 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F8 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F2 · ownership.nature: Represents shares held directly by Flagship V VentureLabs Rx Fund, L.P. ("Flagship Fund V Rx").

F6 · ownership.nature: VentureLabs V Manager LLC ("VentureLabs V Manager") is the manager of VentureLabs V. Flagship Pioneering, Inc. ("Flagship Pioneering") is the manager of VentureLabs V Manager. The General Partner of Flagship Pioneering VI is Flagship Pioneering Fund VI General Partner LLC ("Flagship Pioneering VI GP"). The manager of Flagship Pioneering VI GP is Flagship Pioneering. The General Partner of Flagship Fund V and Flagship Fund V Rx is Flagship Ventures Fund V General Partner LLC ("Flagship V GP" and, together with VentureLabs V Manager, Flagship Pioneering, and Flagship Pioneering VI GP, the "Flagship General Partners").

F7 · ownership.nature: (continued from footnote 6) Noubar B. Afeyan, Ph.D. is the sole Director of Flagship Pioneering and may be deemed to have sole voting and investment control over all the shares held by VentureLabs V and Flagship Fund VI. In addition, Noubar B. Afeyan, Ph.D. serves as the sole manager of Flagship V GP and may be deemed to possess sole voting and investment control over all the shares held by Flagship Fund V and Flagship Fund V Rx. None of the Flagship General Partners nor Noubar B. Afeyan, Ph.D. directly own any of the shares held by the Flagship Pioneering Funds, and each of the Flagship General Partners and Noubar Afeyan, Ph.D. disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-005747 · doc4.xml · nonDerivative · entry 4

Flagship Ventures Fund V General Partner LLC · CIK 0001724575 · 10% owner

Flagship V VentureLabs Rx Fund, L.P. · CIK 0001724939 · 10% owner

Flagship Ventures Fund V, L.P. · CIK 0001627639 · 10% owner

Flagship Pioneering Inc. · CIK 0001400240 · 10% owner

Flagship Pioneering Fund VI General Partner LLC · CIK 0001724957 · 10% owner

Flagship Pioneering Fund VI, L.P. · CIK 0001716926 · 10% owner

Flagship VentureLabs V Manager LLC · CIK 0001768987 · 10% owner

Flagship VentureLabs V LLC · CIK 0001724959 · 10% owner

AFEYAN NOUBAR · CIK 0001222012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 11,585,199

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F5 · ownership.nature: Represents shares held directly by Flagship Ventures Fund V, L.P. ("Flagship Fund V" and together with Flagship Fund V Rx, Flagship Pioneering VI, and VentureLabs V, the "Flagship Pioneering Funds").

F6 · ownership.nature: VentureLabs V Manager LLC ("VentureLabs V Manager") is the manager of VentureLabs V. Flagship Pioneering, Inc. ("Flagship Pioneering") is the manager of VentureLabs V Manager. The General Partner of Flagship Pioneering VI is Flagship Pioneering Fund VI General Partner LLC ("Flagship Pioneering VI GP"). The manager of Flagship Pioneering VI GP is Flagship Pioneering. The General Partner of Flagship Fund V and Flagship Fund V Rx is Flagship Ventures Fund V General Partner LLC ("Flagship V GP" and, together with VentureLabs V Manager, Flagship Pioneering, and Flagship Pioneering VI GP, the "Flagship General Partners").

F7 · ownership.nature: (continued from footnote 6) Noubar B. Afeyan, Ph.D. is the sole Director of Flagship Pioneering and may be deemed to have sole voting and investment control over all the shares held by VentureLabs V and Flagship Fund VI. In addition, Noubar B. Afeyan, Ph.D. serves as the sole manager of Flagship V GP and may be deemed to possess sole voting and investment control over all the shares held by Flagship Fund V and Flagship Fund V Rx. None of the Flagship General Partners nor Noubar B. Afeyan, Ph.D. directly own any of the shares held by the Flagship Pioneering Funds, and each of the Flagship General Partners and Noubar Afeyan, Ph.D. disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-005747 · doc4.xml · nonDerivative · entry 3

Flagship Ventures Fund V General Partner LLC · CIK 0001724575 · 10% owner

Flagship V VentureLabs Rx Fund, L.P. · CIK 0001724939 · 10% owner

Flagship Ventures Fund V, L.P. · CIK 0001627639 · 10% owner

Flagship Pioneering Inc. · CIK 0001400240 · 10% owner

Flagship Pioneering Fund VI General Partner LLC · CIK 0001724957 · 10% owner

Flagship Pioneering Fund VI, L.P. · CIK 0001716926 · 10% owner

Flagship VentureLabs V Manager LLC · CIK 0001768987 · 10% owner

Flagship VentureLabs V LLC · CIK 0001724959 · 10% owner

AFEYAN NOUBAR · CIK 0001222012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 11,441,326

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F4 · ownership.nature: Represents shares held directly by Flagship VentureLabs V LLC. ("VentureLabs V").

F6 · ownership.nature: VentureLabs V Manager LLC ("VentureLabs V Manager") is the manager of VentureLabs V. Flagship Pioneering, Inc. ("Flagship Pioneering") is the manager of VentureLabs V Manager. The General Partner of Flagship Pioneering VI is Flagship Pioneering Fund VI General Partner LLC ("Flagship Pioneering VI GP"). The manager of Flagship Pioneering VI GP is Flagship Pioneering. The General Partner of Flagship Fund V and Flagship Fund V Rx is Flagship Ventures Fund V General Partner LLC ("Flagship V GP" and, together with VentureLabs V Manager, Flagship Pioneering, and Flagship Pioneering VI GP, the "Flagship General Partners").

F7 · ownership.nature: (continued from footnote 6) Noubar B. Afeyan, Ph.D. is the sole Director of Flagship Pioneering and may be deemed to have sole voting and investment control over all the shares held by VentureLabs V and Flagship Fund VI. In addition, Noubar B. Afeyan, Ph.D. serves as the sole manager of Flagship V GP and may be deemed to possess sole voting and investment control over all the shares held by Flagship Fund V and Flagship Fund V Rx. None of the Flagship General Partners nor Noubar B. Afeyan, Ph.D. directly own any of the shares held by the Flagship Pioneering Funds, and each of the Flagship General Partners and Noubar Afeyan, Ph.D. disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-005747 · doc4.xml · nonDerivative · entry 2

Flagship Ventures Fund V General Partner LLC · CIK 0001724575 · 10% owner

Flagship V VentureLabs Rx Fund, L.P. · CIK 0001724939 · 10% owner

Flagship Ventures Fund V, L.P. · CIK 0001627639 · 10% owner

Flagship Pioneering Inc. · CIK 0001400240 · 10% owner

Flagship Pioneering Fund VI General Partner LLC · CIK 0001724957 · 10% owner

Flagship Pioneering Fund VI, L.P. · CIK 0001716926 · 10% owner

Flagship VentureLabs V Manager LLC · CIK 0001768987 · 10% owner

Flagship VentureLabs V LLC · CIK 0001724959 · 10% owner

AFEYAN NOUBAR · CIK 0001222012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 9,725,122

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F3 · ownership.nature: Represents shares held directly by Flagship Pioneering Fund VI, L.P. ("Flagship Pioneering VI").

F6 · ownership.nature: VentureLabs V Manager LLC ("VentureLabs V Manager") is the manager of VentureLabs V. Flagship Pioneering, Inc. ("Flagship Pioneering") is the manager of VentureLabs V Manager. The General Partner of Flagship Pioneering VI is Flagship Pioneering Fund VI General Partner LLC ("Flagship Pioneering VI GP"). The manager of Flagship Pioneering VI GP is Flagship Pioneering. The General Partner of Flagship Fund V and Flagship Fund V Rx is Flagship Ventures Fund V General Partner LLC ("Flagship V GP" and, together with VentureLabs V Manager, Flagship Pioneering, and Flagship Pioneering VI GP, the "Flagship General Partners").

F7 · ownership.nature: (continued from footnote 6) Noubar B. Afeyan, Ph.D. is the sole Director of Flagship Pioneering and may be deemed to have sole voting and investment control over all the shares held by VentureLabs V and Flagship Fund VI. In addition, Noubar B. Afeyan, Ph.D. serves as the sole manager of Flagship V GP and may be deemed to possess sole voting and investment control over all the shares held by Flagship Fund V and Flagship Fund V Rx. None of the Flagship General Partners nor Noubar B. Afeyan, Ph.D. directly own any of the shares held by the Flagship Pioneering Funds, and each of the Flagship General Partners and Noubar Afeyan, Ph.D. disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-005747 · doc4.xml · nonDerivative · entry 1

Flagship Ventures Fund V General Partner LLC · CIK 0001724575 · 10% owner

Flagship V VentureLabs Rx Fund, L.P. · CIK 0001724939 · 10% owner

Flagship Ventures Fund V, L.P. · CIK 0001627639 · 10% owner

Flagship Pioneering Inc. · CIK 0001400240 · 10% owner

Flagship Pioneering Fund VI General Partner LLC · CIK 0001724957 · 10% owner

Flagship Pioneering Fund VI, L.P. · CIK 0001716926 · 10% owner

Flagship VentureLabs V Manager LLC · CIK 0001768987 · 10% owner

Flagship VentureLabs V LLC · CIK 0001724959 · 10% owner

AFEYAN NOUBAR · CIK 0001222012 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 1,487,371

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · ownership.nature: Represents shares held directly by Flagship V VentureLabs Rx Fund, L.P. ("Flagship Fund V Rx").

F6 · ownership.nature: VentureLabs V Manager LLC ("VentureLabs V Manager") is the manager of VentureLabs V. Flagship Pioneering, Inc. ("Flagship Pioneering") is the manager of VentureLabs V Manager. The General Partner of Flagship Pioneering VI is Flagship Pioneering Fund VI General Partner LLC ("Flagship Pioneering VI GP"). The manager of Flagship Pioneering VI GP is Flagship Pioneering. The General Partner of Flagship Fund V and Flagship Fund V Rx is Flagship Ventures Fund V General Partner LLC ("Flagship V GP" and, together with VentureLabs V Manager, Flagship Pioneering, and Flagship Pioneering VI GP, the "Flagship General Partners").

F7 · ownership.nature: (continued from footnote 6) Noubar B. Afeyan, Ph.D. is the sole Director of Flagship Pioneering and may be deemed to have sole voting and investment control over all the shares held by VentureLabs V and Flagship Fund VI. In addition, Noubar B. Afeyan, Ph.D. serves as the sole manager of Flagship V GP and may be deemed to possess sole voting and investment control over all the shares held by Flagship Fund V and Flagship Fund V Rx. None of the Flagship General Partners nor Noubar B. Afeyan, Ph.D. directly own any of the shares held by the Flagship Pioneering Funds, and each of the Flagship General Partners and Noubar Afeyan, Ph.D. disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-005749 · doc4.xml · derivative · entry 4

Bishop Hans Edgar · CIK 0001480212 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 156,250 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

SEC source: 0000899243-21-005749 · doc4.xml · derivative · entry 3

Bishop Hans Edgar · CIK 0001480212 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 800,000 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

SEC source: 0000899243-21-005749 · doc4.xml · derivative · entry 2

Bishop Hans Edgar · CIK 0001480212 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,075,000 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

SEC source: 0000899243-21-005749 · doc4.xml · nonDerivative · entry 1

Bishop Hans Edgar · CIK 0001480212 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,736,250

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

SEC source: 0000899243-21-005739 · doc4.xml · derivative · entry 14

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 2,343,750 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F9 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F6 · ownership.nature: Represents shares held directly by ARCH Venture Fund X Overage, L.P. (ARCH X Overage). ARCH Venture Partners X Overage, L.P. (AVP X Overage LP) is the sole general partner of ARCH X Overage.

F7 · ownership.nature: ARCH Venture Partners X, LLC (AVP X LLC) is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow and Steven Gillis are members of the investment committee of AVP X LLC (the AVP X Committee Members). AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members each disclaim beneficial ownership except to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · derivative · entry 13

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 2,343,750 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F9 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F5 · ownership.nature: Represents shares held directly by ARCH Venture Fund X, L.P. (ARCH X). ARCH Venture Partners X, L.P. (AVP X LP) is the sole general partner of ARCH X.

F7 · ownership.nature: ARCH Venture Partners X, LLC (AVP X LLC) is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow and Steven Gillis are members of the investment committee of AVP X LLC (the AVP X Committee Members). AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members each disclaim beneficial ownership except to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · derivative · entry 12

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 781,250 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F9 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F3 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX Overage, L.P. (ARCH IX Overage). ARCH Venture Partners IX Overage, L.P. (AVP IX Overage LP) is the sole general partner of ARCH IX Overage.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · derivative · entry 11

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 781,250 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F9 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F2 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX, L.P. (ARCH IX). ARCH Venture Partners IX, L.P. (AVP IX LP) is the sole general partner of ARCH IX.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · derivative · entry 10

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 5,687,500 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F9 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F3 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX Overage, L.P. (ARCH IX Overage). ARCH Venture Partners IX Overage, L.P. (AVP IX Overage LP) is the sole general partner of ARCH IX Overage.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · derivative · entry 9

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 9,375,000 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F9 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F6 · ownership.nature: Represents shares held directly by ARCH Venture Fund X Overage, L.P. (ARCH X Overage). ARCH Venture Partners X Overage, L.P. (AVP X Overage LP) is the sole general partner of ARCH X Overage.

F7 · ownership.nature: ARCH Venture Partners X, LLC (AVP X LLC) is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow and Steven Gillis are members of the investment committee of AVP X LLC (the AVP X Committee Members). AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members each disclaim beneficial ownership except to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · derivative · entry 8

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 9,375,000 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F9 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F5 · ownership.nature: Represents shares held directly by ARCH Venture Fund X, L.P. (ARCH X). ARCH Venture Partners X, L.P. (AVP X LP) is the sole general partner of ARCH X.

F7 · ownership.nature: ARCH Venture Partners X, LLC (AVP X LLC) is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow and Steven Gillis are members of the investment committee of AVP X LLC (the AVP X Committee Members). AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members each disclaim beneficial ownership except to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · derivative · entry 7

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 5,687,500 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F9 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F2 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX, L.P. (ARCH IX). ARCH Venture Partners IX, L.P. (AVP IX LP) is the sole general partner of ARCH IX.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · derivative · entry 6

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 3,687,500 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F9 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F3 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX Overage, L.P. (ARCH IX Overage). ARCH Venture Partners IX Overage, L.P. (AVP IX Overage LP) is the sole general partner of ARCH IX Overage.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · derivative · entry 5

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 3,687,500 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F9 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

F2 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX, L.P. (ARCH IX). ARCH Venture Partners IX, L.P. (AVP IX LP) is the sole general partner of ARCH IX.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · nonDerivative · entry 4

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 11,718,750

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F6 · ownership.nature: Represents shares held directly by ARCH Venture Fund X Overage, L.P. (ARCH X Overage). ARCH Venture Partners X Overage, L.P. (AVP X Overage LP) is the sole general partner of ARCH X Overage.

F7 · ownership.nature: ARCH Venture Partners X, LLC (AVP X LLC) is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow and Steven Gillis are members of the investment committee of AVP X LLC (the AVP X Committee Members). AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members each disclaim beneficial ownership except to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · nonDerivative · entry 3

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 11,718,750

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F5 · ownership.nature: Represents shares held directly by ARCH Venture Fund X, L.P. (ARCH X). ARCH Venture Partners X, L.P. (AVP X LP) is the sole general partner of ARCH X.

F7 · ownership.nature: ARCH Venture Partners X, LLC (AVP X LLC) is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow and Steven Gillis are members of the investment committee of AVP X LLC (the AVP X Committee Members). AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members each disclaim beneficial ownership except to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · nonDerivative · entry 2

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 10,301,250

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F3 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX Overage, L.P. (ARCH IX Overage). ARCH Venture Partners IX Overage, L.P. (AVP IX Overage LP) is the sole general partner of ARCH IX Overage.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005739 · doc4.xml · nonDerivative · entry 1

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 10,303,750

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · ownership.nature: Represents shares held directly by ARCH Venture Fund IX, L.P. (ARCH IX). ARCH Venture Partners IX, L.P. (AVP IX LP) is the sole general partner of ARCH IX.

F4 · ownership.nature: ARCH Venture Partners IX, LLC (AVP IX LLC) is the sole general partner of each of AVP IX LP and AVP IX Overage LP. Keith Crandell and Clinton Bybee are managing directors of AVP IX LLC (the AVP IX MDs). AVP IX LP and AVP IX Overage LP may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, respectively, AVP IX LLC may be deemed to beneficially own the shares held by ARCH IX and ARCH IX Overage, and each of the AVP IX MDs may be deemed to share the power to direct the disposition and vote of the shares held by ARCH IX and ARCH IX Overage. AVP IX LP, AVP IX Overage LP, AVP IX LLC, and the AVP IX MDs each disclaim beneficial ownership except to to the extent of any pecuniary interest therein.

F8 · ownership.nature: The Reporting Person is an AVP IX MD and an AVP X Committee Member and may be deemed to beneficially own the shares held by ARCH IX, ARCH IX Overage, ARCH X, and ARCH X Overage. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-005738 · doc4.xml · derivative · entry 5

Harr Steve · CIK 0001627387 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 156,250 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

SEC source: 0000899243-21-005738 · doc4.xml · derivative · entry 4

Harr Steve · CIK 0001627387 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 800,000 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

SEC source: 0000899243-21-005738 · doc4.xml · derivative · entry 3

Harr Steve · CIK 0001627387 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,075,000 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

SEC source: 0000899243-21-005738 · doc4.xml · nonDerivative · entry 1

Harr Steve · CIK 0001627387 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,173,750

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

SEC source: 0000899243-21-005728 · doc4.xml · derivative · entry 6

MacDonald James J. · CIK 0001830054 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Indirect · Held by The James J. MacDonald and Rena Chng Trust dtd 01/15/10

Disclosed balance after: 0

Underlying: Common Stock · 7,812 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

SEC source: 0000899243-21-005728 · doc4.xml · derivative · entry 5

MacDonald James J. · CIK 0001830054 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 93,750 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

SEC source: 0000899243-21-005728 · doc4.xml · nonDerivative · entry 2

MacDonald James J. · CIK 0001830054 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Indirect · Held by The James J. MacDonald and Rena Chng Trust dtd 01/15/10

Disclosed balance after: 7,812

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

SEC source: 0000899243-21-005728 · doc4.xml · nonDerivative · entry 1

MacDonald James J. · CIK 0001830054 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 428,750

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

SEC source: 0000899243-21-005736 · doc4.xml · derivative · entry 4

von Maltzahn Geoffrey · CIK 0001768286 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Held by the Geoffrey A. von Malzahn 2020 GRAT

Disclosed balance after: 0

Underlying: Common Stock · 366,122 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

SEC source: 0000899243-21-005736 · doc4.xml · derivative · entry 3

von Maltzahn Geoffrey · CIK 0001768286 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,464,488 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F1 · derivative.exercise_date: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

F2 · derivative.expiration_date: The expiration date is not relevant to the conversion of these securities.

SEC source: 0000899243-21-005736 · doc4.xml · nonDerivative · entry 2

von Maltzahn Geoffrey · CIK 0001768286 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Held by the Geoffrey A. von Malzahn 2020 GRAT

Disclosed balance after: 366,122

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

SEC source: 0000899243-21-005736 · doc4.xml · nonDerivative · entry 1

von Maltzahn Geoffrey · CIK 0001768286 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,464,488

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

F1 · price: The shares of Issuer's Preferred Stock automatically convert into shares of Issuer's Common Stock, for no additional consideration, on a 1-for-1 basis immediately prior to the consummation of Issuer's initial public offering.

SEC source: 0000899243-21-005071 · doc4.xml · derivative · entry 1

Wilderotter Mary Agnes · CIK 0001180610 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,000

Underlying: Common Stock · 14,000 shares

Expires 2031-02-02

F1 · derivative.exercise_date: The stock option shall vest and become exercisable in full on February 3, 2022.

SEC source: 0000899243-21-005076 · doc4.xml · derivative · entry 1

Bilenker Joshua H. · CIK 0001612312 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,000

Underlying: Common Stock · 7,000 shares

Expires 2031-02-02

F1 · derivative.exercise_date: The stock option shall vest and become exercisable in full on February 3, 2022.

SEC source: 0000899243-21-005072 · doc4.xml · derivative · entry 1

Cole Douglas G. · CIK 0001486373 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,000

Underlying: Common Stock · 14,000 shares

Expires 2031-02-02

F1 · derivative.exercise_date: The stock option shall vest and become exercisable in full on February 3, 2022.

SEC source: 0000899243-21-005082 · doc4.xml · derivative · entry 1

Bishop Hans Edgar · CIK 0001480212 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,000

Underlying: Common Stock · 14,000 shares

Expires 2031-02-02

F1 · derivative.exercise_date: The stock option shall vest and become exercisable in full on February 3, 2022.

SEC source: 0000899243-21-005086 · doc4.xml · derivative · entry 1

NELSEN ROBERT · CIK 0001219042 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,000

Underlying: Common Stock · 14,000 shares

Expires 2031-02-02

F1 · derivative.exercise_date: The stock option shall vest and become exercisable in full on February 3, 2022.

SEC source: 0000899243-21-005065 · doc4.xml · derivative · entry 1

Yang Patrick Y · CIK 0001309988 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,000

Underlying: Common Stock · 14,000 shares

Expires 2031-02-02

F1 · derivative.exercise_date: The stock option shall vest and become exercisable in full on February 3, 2022.