DNTH

SEC source: 0000899243-22-018801 · doc4.xml · derivative · entry 1

Beetham Thomas W. · CIK 0001741382 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Stock · 50,000 shares

Expires 2032-05-16

F1 · derivative.exercise_date: This option shall vest and become exercisable in three equal installments, each installment vesting every six months, over the 18 months following the vesting commencement date. The vesting commencement date is May 15, 2022.

SEC source: 0000899243-22-018798 · doc4.xml · derivative · entry 1

Deardorf Caren · CIK 0001871152 · Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Stock · 50,000 shares

Expires 2032-05-16

F1 · derivative.exercise_date: This option shall vest and become exercisable in three equal installments, each installment vesting every six months, over the 18 months following the vesting commencement date. The vesting commencement date is May 15, 2022.

SEC source: 0000899243-22-006824 · doc4.xml · derivative · entry 1

Humphrey Jeffrey · CIK 0001816944 · Chief Medical Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Stock · 75,000 shares

Expires 2032-02-14

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on the first quarter following the vesting commencement date. The vesting commencement date is February 1, 2022.

SEC source: 0000899243-22-006820 · doc4.xml · derivative · entry 1

Stants Kristen · CIK 0001805727 · Chief People Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 85,000

Underlying: Common Stock · 85,000 shares

Expires 2032-02-14

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on the first quarter following the vesting commencement date. The vesting commencement date is February 1, 2022.

SEC source: 0000899243-22-006830 · doc4.xml · derivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 187,500

Underlying: Common Stock · 187,500 shares

Expires 2032-02-14

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on the first quarter following the vesting commencement date. The vesting commencement date is February 1, 2022.

SEC source: 0000899243-22-006818 · doc4.xml · derivative · entry 1

Nichols David Wayne · CIK 0001857488 · Chief Technical Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Stock · 75,000 shares

Expires 2032-02-14

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on the first quarter following the vesting commencement date. The vesting commencement date is February 1, 2022.

SEC source: 0000899243-22-006821 · doc4.xml · derivative · entry 1

Deardorf Caren · CIK 0001871152 · Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Stock · 75,000 shares

Expires 2032-02-14

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on the first quarter following the vesting commencement date. The vesting commencement date is February 1, 2022.

SEC source: 0000899243-22-006815 · doc4.xml · derivative · entry 1

Olson Lisa · CIK 0001824009 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 100,000

Underlying: Common Stock · 100,000 shares

Expires 2032-02-14

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on the first quarter following the vesting commencement date. The vesting commencement date is February 1, 2022.

SEC source: 0000899243-22-006814 · doc4.xml · derivative · entry 1

Mahoney Stephen F. · CIK 0001741389 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 130,000

Underlying: Common Stock · 130,000 shares

Expires 2032-02-14

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on the first quarter following the vesting commencement date. The vesting commencement date is February 1, 2022.

SEC source: 0000899243-22-006813 · doc4.xml · derivative · entry 1

Beetham Thomas W. · CIK 0001741382 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Stock · 75,000 shares

Expires 2032-02-14

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on the first quarter following the vesting commencement date. The vesting commencement date is February 1, 2022.

SEC source: 0000899243-21-038823 · doc4.xml · derivative · entry 1

Humphrey Jeffrey · CIK 0001816944 · Chief Medical Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 275,000

Underlying: Common Stock · 275,000 shares

Expires 2031-09-30

F1 · derivative.exercise_date: This option shall vest and become exerciseable over four years, with 25% of this option vesting on October 1, 2022, and the remainder vesting in 36 equal monthly installments thereafter.

SEC source: 0000899243-21-036604 · doc4.xml · nonDerivative · entry 1

Stants Kristen · CIK 0001805727 · Chief People Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,264

F1 · kind: This transaction represents shares sold solely to pay taxes due upon the vesting of restricted stock units, as disclosed by the reporting person on the Form 4 filed on September 16, 2021.

F2 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.60 to $6.87, inclusive. The reporting person undertakes to provide 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 range set forth in this footnote.

SEC source: 0000899243-21-036600 · doc4.xml · nonDerivative · entry 1

Deardorf Caren · CIK 0001871152 · Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,762

F1 · kind: This transaction represents shares sold solely to pay taxes due upon the vesting of restricted stock units, as disclosed by the reporting person on the Form 4 filed on September 16, 2021.

F2 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.60 to $6.87, inclusive. The reporting person undertakes to provide 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 range set forth in this footnote.

SEC source: 0000899243-21-036601 · doc4.xml · nonDerivative · entry 1

Mahoney Stephen F. · CIK 0001741389 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,264

F1 · kind: This transaction represents shares sold solely to pay taxes due upon the vesting of restricted stock units, as disclosed by the reporting person on the Form 4 filed on September 16, 2021.

F2 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.60 to $6.87, inclusive. The reporting person undertakes to provide 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 range set forth in this footnote.

SEC source: 0000899243-21-036599 · doc4.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 286,872

F1 · kind: This transaction represents shares sold solely to pay taxes due upon the vesting of restricted stock units, as disclosed by the reporting person on the Form 4 filed on September 16, 2021.

F2 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.60 to $6.87, inclusive. The reporting person undertakes to provide 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 range set forth in this footnote.

SEC source: 0000899243-21-036598 · doc4.xml · nonDerivative · entry 1

Beetham Thomas W. · CIK 0001741382 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,897

F1 · kind: This transaction represents shares sold solely to pay taxes due upon the vesting of restricted stock units, as disclosed by the reporting person on the Form 4 filed on September 16, 2021.

F2 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.60 to $6.87, inclusive. The reporting person undertakes to provide 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 range set forth in this footnote.

SEC source: 0000899243-21-036596 · doc4.xml · nonDerivative · entry 1

Olson Lisa · CIK 0001824009 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,264

F1 · kind: This transaction represents shares sold solely to pay taxes due upon the vesting of restricted stock units, as disclosed by the reporting person on the Form 4 filed on September 16, 2021.

F2 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.60 to $6.87, inclusive. The reporting person undertakes to provide 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 range set forth in this footnote.

SEC source: 0000899243-21-036595 · doc4.xml · nonDerivative · entry 1

Nichols David Wayne · CIK 0001857488 · Chief Technical Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,306

F1 · kind: This transaction represents shares sold solely to pay taxes due upon the vesting of restricted stock units, as disclosed by the reporting person on the Form 4 filed on September 16, 2021.

F2 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.60 to $6.87, inclusive. The reporting person undertakes to provide 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 range set forth in this footnote.

SEC source: 0000899243-21-036341 · doc4.xml · nonDerivative · entry 1

Stants Kristen · CIK 0001805727 · Chief People Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

F1 · kind: On October 26, 2020, the reporting person was granted 40,000 restricted stock units. The restricted stock units vest in two equal installments subject to the achievement of certain performance milestones related to the issuer's business plans. The first performance milestone was achieved, resulting in vesting of 20,000 restricted stock units and the corresponding issuance of 20,000 shares of issuer common stock.

SEC source: 0000899243-21-036342 · doc4.xml · nonDerivative · entry 1

Olson Lisa · CIK 0001824009 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

F1 · kind: On February 11, 2021, the reporting person was granted 40,000 restricted stock units. The restricted stock units vest in two equal installments subject to the achievement of certain performance milestones related to the issuer's business plans. The first performance milestone was achieved, resulting in vesting of 20,000 restricted stock units and the corresponding issuance of 20,000 shares of issuer common stock.

SEC source: 0000899243-21-036338 · doc4.xml · nonDerivative · entry 1

Deardorf Caren · CIK 0001871152 · Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

F1 · kind: On July 6, 2021, the reporting person was granted 40,000 restricted stock units. The restricted stock units vest in two equal installments subject to the achievement of certain performance milestones related to the issuer's business plans. The first performance milestone was achieved, resulting in vesting of 20,000 restricted stock units and the corresponding issuance of 20,000 shares of issuer common stock.

SEC source: 0000899243-21-036337 · doc4.xml · nonDerivative · entry 1

Mahoney Stephen F. · CIK 0001741389 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

F1 · kind: On February 11, 2021, the reporting person was granted 40,000 restricted stock units. The restricted stock units vest in two equal installments subject to the achievement of certain performance milestones related to the issuer's business plans. The first performance milestone was achieved, resulting in vesting of 20,000 restricted stock units and the corresponding issuance of 20,000 shares of issuer common stock.

SEC source: 0000899243-21-036335 · doc4.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 301,212

F1 · kind: On February 11, 2021, the reporting person was granted 100,000 restricted stock units. The restricted stock units vest in two equal installments subject to the achievement of certain performance milestones related to the issuer's business plans. The first performance milestone was achieved, resulting in vesting of 50,000 restricted stock units and the corresponding issuance of 50,000 shares of issuer common stock.

SEC source: 0000899243-21-036333 · doc4.xml · nonDerivative · entry 1

Nichols David Wayne · CIK 0001857488 · Chief Technical Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

F1 · kind: On April 19, 2021, the reporting person was granted 40,000 restricted stock units. The restricted stock units vest in two equal installments subject to the achievement of certain performance milestones related to the issuer's business plans. The first performance milestone was achieved, resulting in vesting of 20,000 restricted stock units and the corresponding issuance of 20,000 shares of issuer common stock.

SEC source: 0000899243-21-036332 · doc4.xml · nonDerivative · entry 1

Beetham Thomas W. · CIK 0001741382 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

F1 · kind: On June 14, 2021, the reporting person was granted 40,000 restricted stock units. The restricted stock units vest in two equal installments subject to the achievement of certain performance milestones related to the issuer's business plans. The first performance milestone was achieved, resulting in vesting of 20,000 restricted stock units and the corresponding issuance of 20,000 shares of issuer common stock.

SEC source: 0000899243-21-037336 · doc4.xml · nonDerivative · entry 1

Borisy Alexis · CIK 0001319446 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,100

F1 · kind: Pro rata distribution from Third Rock Ventures GP IV, L.P., of which the reporting person is a limited partner.

SEC source: 0000899243-21-034297 · doc4.xml · nonDerivative · entry 1

Third Rock Ventures IV, L.P. · CIK 0001688327 · 10% owner

Third Rock Ventures GP IV, L.P. · CIK 0001688326 · 10% owner

TRV GP IV, LLC · CIK 0001688325 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,758,204

F1 · kind: On August 25, 2021, Third Rock Ventures IV, L.P. ("TRV IV") distributed for no consideration, 1,250,000 shares of Common Stock of the Issuer (the "Shares") to its limited partners and to Third Rock Ventures GP IV, L.P. ("TRV GP IV"), the general partner of TRV IV, representing each such partner's pro rata interest in such Shares. On the same date, TRV GP IV distributed, for no consideration, the Shares it received in the distribution by TRV IV to its partners, representing each such partner's pro rata interest in such Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F1 · price: On August 25, 2021, Third Rock Ventures IV, L.P. ("TRV IV") distributed for no consideration, 1,250,000 shares of Common Stock of the Issuer (the "Shares") to its limited partners and to Third Rock Ventures GP IV, L.P. ("TRV GP IV"), the general partner of TRV IV, representing each such partner's pro rata interest in such Shares. On the same date, TRV GP IV distributed, for no consideration, the Shares it received in the distribution by TRV IV to its partners, representing each such partner's pro rata interest in such Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F2 · ownership.direct: These shares are directly held by TRV IV. The general partner of TRV IV is TRV GP IV. The general partner of TRV GP IV is TRV GP IV, LLC ("TRV GP IV LLC"). Each of TRV GP IV and TRV GP IV LLC disclaims beneficial ownership of the shares except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that it is the beneficial owner of such shares.

SEC source: 0000899243-21-031274 · doc4.xml · derivative · entry 1

Stants Kristen · CIK 0001805727 · Chief People Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 67,500

Underlying: Common Stock · 67,500 shares

Expires 2031-08-01

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on August 2, 2021.

SEC source: 0000899243-21-031275 · doc4.xml · derivative · entry 1

Olson Lisa · CIK 0001824009 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,500

Underlying: Common Stock · 12,500 shares

Expires 2031-08-01

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on August 2, 2021.

SEC source: 0000899243-21-031272 · doc4.xml · derivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 112,500

Underlying: Common Stock · 112,500 shares

Expires 2031-08-01

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on August 2, 2021.

SEC source: 0000899243-21-029470 · doc4.xml · derivative · entry 1

Olson Lisa · CIK 0001824009 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Stock · 50,000 shares

Expires 2031-07-19

F1 · derivative.exercise_date: This option shall vest and become exercisable over four years, with 25% of this option vesting on July 20, 2022, and the remainder vesting in 36 equal monthly installments thereafter.

SEC source: 0000899243-21-027882 · doc4.xml · derivative · entry 1

Deardorf Caren · CIK 0001871152 · Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 200,000

Underlying: Common Stock · 200,000 shares

Expires 2031-07-05

F1 · derivative.exercise_date: This option shall vest and become exerciseable over four years, with 25% of this option vesting on July 6, 2022, and the remainder vesting in 36 equal monthly installments thereafter.

SEC source: 0000899243-21-023865 · doc4.xml · derivative · entry 1

Beetham Thomas W. · CIK 0001741382 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 200,000

Underlying: Common Stock · 200,000 shares

Expires 2031-06-13

F1 · derivative.exercise_date: This option shall vest and become exerciseable over four years, with 25% of this option vesting on June 14, 2022, and the remainder vesting in 36 equal monthly installments thereafter.

SEC source: 0000899243-21-021849 · doc4.xml · derivative · entry 1

McGeorge Anne · CIK 0001779934 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,188

Underlying: Common Stock · 18,188 shares

Expires 2031-05-31

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 1, 2022 or (b) the next annual meeting of the Issuer's stockholders.

SEC source: 0000899243-21-021848 · doc4.xml · derivative · entry 1

Lawton Alison Frances · CIK 0001542650 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,188

Underlying: Common Stock · 18,188 shares

Expires 2031-05-31

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 1, 2022 or (b) the next annual meeting of the Issuer's stockholders.

SEC source: 0000899243-21-021847 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,188

Underlying: Common Stock · 18,188 shares

Expires 2031-05-31

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 1, 2022 or (b) the next annual meeting of the Issuer's stockholders.

F2 · ownership.direct: This option was granted to the Reporting Person, a director of the Issuer. The proceeds of any sale of shares of common stock issued to the Reporting Person upon exercise of this option will be transferred to Atlas Venture Life Science Advisors, LLC and as such, the Reporting Person disclaims ownership of such securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of his pecuniary interest therein, if any.

SEC source: 0000899243-21-021845 · doc4.xml · derivative · entry 1

RONNEBERG AMY L · CIK 0001380292 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,188

Underlying: Common Stock · 18,188 shares

Expires 2031-05-31

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 1, 2022 or (b) the next annual meeting of the Issuer's stockholders.

SEC source: 0000899243-21-021843 · doc4.xml · derivative · entry 1

BONNEY MICHAEL W · CIK 0001219016 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,188

Underlying: Common Stock · 18,188 shares

Expires 2031-05-31

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 1, 2022 or (b) the next annual meeting of the Issuer's stockholders.

SEC source: 0000899243-21-021839 · doc4.xml · derivative · entry 1

Scadden David · CIK 0001707715 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,188

Underlying: Common Stock · 18,188 shares

Expires 2031-05-31

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 1, 2022 or (b) the next annual meeting of the Issuer's stockholders.

SEC source: 0000899243-21-021838 · doc4.xml · derivative · entry 1

Daniel Thomas O · CIK 0001538894 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,188

Underlying: Common Stock · 18,188 shares

Expires 2031-05-31

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 1, 2022 or (b) the next annual meeting of the Issuer's stockholders.

SEC source: 0000899243-21-021836 · doc4.xml · derivative · entry 1

Borisy Alexis · CIK 0001319446 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,188

Underlying: Common Stock · 18,188 shares

Expires 2031-05-31

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 1, 2022 or (b) the next annual meeting of the Issuer's stockholders.

SEC source: 0000899243-21-021835 · doc4.xml · derivative · entry 1

Albers Jeffrey W. · CIK 0001638474 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,188

Underlying: Common Stock · 18,188 shares

Expires 2031-05-31

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 1, 2022 or (b) the next annual meeting of the Issuer's stockholders.

SEC source: 0000899243-21-016411 · doc4.xml · derivative · entry 1

Nichols David Wayne · CIK 0001857488 · Chief Technical Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 175,000

Underlying: Common Stock · 175,000 shares

Expires 2031-04-18

F1 · derivative.exercise_date: This option shall vest and become exerciseable over four years, with 25% of this option vesting on April 19, 2021, and the remainder vesting in 36 equal monthly installments thereafter.

SEC source: 0000899243-21-019632 · doc4a.xml · derivative · entry 1

Nichols David Wayne · CIK 0001857488 · Chief Technical Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 175,000

Underlying: Common Stock · 175,000 shares

Expires 2031-04-18

F1 · derivative.exercise_date: This option shall vest and become exerciseable over four years, with 25% of this option vesting on April 19, 2022, and the remainder vesting in 36 equal monthly installments thereafter.

F2 · derivative.exercise_date: This amendment has been filed to revise the vesting terms of Mr. Nichols' stock option, which were reported incorrectly on Mr. Nichols' prior Form 4. The corrected vesting schedule is included in Footnote 1 above.

SEC source: 0000899243-21-006705 · doc4.xml · derivative · entry 1

Stants Kristen · CIK 0001805727 · Chief People Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 67,500

Underlying: Common Stock · 67,500 shares

Expires 2031-02-10

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on January 1, 2021.

SEC source: 0000899243-21-006727 · doc4.xml · derivative · entry 1

Olson Lisa · CIK 0001824009 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,500

Underlying: Common Stock · 12,500 shares

Expires 2031-02-10

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on January 1, 2021.

SEC source: 0001209191-21-010943 · doc4.xml · nonDerivative · entry 1

Atlas Venture Fund X, L.P. · CIK 0001628098 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,148,399

F1 · kind: Represent a pro rata distribution, and not a purchase or sale of securities, by Atlas Venture Fund X, L.P. ("AVF X") to its general partner and limited partners without additional consideration. This distribution was effected pursuant to a plan adopted in accordance with Rule 10b5-1 on September 25, 2020.

F2 · ownership.direct: The shares are held directly by AVF X. The general partner of AVF X is Atlas Venture Associates X, L.P. ("AVA X LP"). Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. Each of AVA X LP and AVA X LLC disclaims Section 16 beneficial ownership of the securities held by AVF X, except to the extent of its pecuniary interest therein, if any.

SEC source: 0000899243-21-006715 · doc4.xml · derivative · entry 1

DAVIS JOHN C. JR · CIK 0001741287 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,500

Underlying: Common Stock · 72,500 shares

Expires 2031-02-10

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on January 1, 2021.

SEC source: 0000899243-21-006713 · doc4.xml · derivative · entry 1

ZDRAVESKI ZORAN · CIK 0001741285 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 67,700

Underlying: Common Stock · 67,700 shares

Expires 2031-02-10

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on January 1, 2021.

SEC source: 0000899243-21-006710 · doc4.xml · derivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 112,500

Underlying: Common Stock · 112,500 shares

Expires 2031-02-10

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on January 1, 2021.