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person · Reporting owner

Booth Bruce

Disclosed activity across 8 companies

Tapewire entity
32920
SEC CIK
0001451612

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
Cogent Biosciences, Inc.UMRX · Entity 3793DirectorJuly 01, 2020July 06, 2020
Dianthus Therapeutics, Inc. /DE/MGTA · Entity 1813DirectorJune 28, 2022June 30, 2022
Kymera Therapeutics, Inc.KYMR · Entity 3545DirectorJune 26, 2026July 02, 2026
Larimar Therapeutics, Inc.ZFGN · Entity 5634Director · 10% ownerJanuary 03, 2018January 05, 2018
Sionna Therapeutics, Inc.SION · Entity 5996DirectorJune 17, 2026June 18, 2026
Tectonic Therapeutic, Inc.AVRO · Entity 5328DirectorJune 06, 2023June 08, 2023
Viridian Therapeutics, Inc.\DEMGEN · Entity 4316DirectorJune 27, 2018June 28, 2018

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

Cogent Biosciences, Inc.

Report date July 01, 2020 · Filed July 06, 2020

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $0.47 · Expires 2030-07-01Direct61,338 Reported balance After 2020-07-01 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2020-07-01 · Grant · Acquired 61,338 · Balance 61,338

F1: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2: This option is fully vested at time of grant.

F3: 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 Advisors, LLC and as such, the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of this pecuniary interest therein, if any.

Filing footnotes · ownership attribution and instrument terms

F1: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2: This option is fully vested at time of grant.

F3: 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 Advisors, LLC and as such, the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of this pecuniary interest therein, if any.

Dianthus Therapeutics, Inc. /DE/

Report date June 28, 2022 · Filed June 30, 2022

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $1.21 · Expires 2032-06-27Direct20,000 Reported balance After 2022-06-28 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2022-06-28 · Grant · Acquired 20,000 · Balance 20,000

F1: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 28, 2023 or (b) the next annual meeting of the Issuer's stockholders.

F2: 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.

Filing footnotes · ownership attribution and instrument terms

F1: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 28, 2023 or (b) the next annual meeting of the Issuer's stockholders.

F2: 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.

Kymera Therapeutics, Inc.

Report date June 26, 2026 · Filed July 02, 2026 · Amendment

Amendment: balances below belong to this corrected disclosure, not necessarily a complete replacement of earlier positions.

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeIndirectSee footnote2,446,375 Reported balance After 2026-06-29 transaction · row 1 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 1 · 2026-06-29 · Sale · Disposed 5,549 · Balance 2,446,375

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F3: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.015 to $106.0145 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold each separate price within the ranges set forth in footnotes (3) and (5) through (10).

F4: These shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. The Reporting Person is a member of AVA X LLC and disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote2,431,577 Reported balance After 2026-06-29 transaction · row 2 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 2 · 2026-06-29 · Sale · Disposed 14,798 · Balance 2,431,577

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F5: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $106.0271 to $106.96 inclusive.

F4: These shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. The Reporting Person is a member of AVA X LLC and disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote2,412,158 Reported balance After 2026-06-29 transaction · row 3 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 3 · 2026-06-29 · Sale · Disposed 19,419 · Balance 2,412,158

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F6: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.03 to $108.0293 inclusive.

F4: These shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. The Reporting Person is a member of AVA X LLC and disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote2,401,310 Reported balance After 2026-06-29 transaction · row 4 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 4 · 2026-06-29 · Sale · Disposed 10,848 · Balance 2,401,310

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F7: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $108.0326 to $109.019 inclusive.

F4: These shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. The Reporting Person is a member of AVA X LLC and disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote2,393,342 Reported balance After 2026-06-29 transaction · row 5 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 5 · 2026-06-29 · Sale · Disposed 7,968 · Balance 2,393,342

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F8: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $109.034 to $109.96 inclusive.

F4: These shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. The Reporting Person is a member of AVA X LLC and disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote2,385,619 Reported balance After 2026-06-29 transaction · row 6 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 6 · 2026-06-29 · Sale · Disposed 7,723 · Balance 2,385,619

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F9: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $110.09 to $111.08 inclusive.

F4: These shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. The Reporting Person is a member of AVA X LLC and disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote2,384,685 Reported balance After 2026-06-29 transaction · row 7 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 7 · 2026-06-29 · Sale · Disposed 934 · Balance 2,384,685

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F10: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $111.09 to $111.63 inclusive.

F4: These shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. The Reporting Person is a member of AVA X LLC and disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote471,497 Reported balance After 2026-06-29 transaction · row 8 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 8 · 2026-06-29 · Sale · Disposed 770 · Balance 471,497

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F3: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.015 to $106.0145 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold each separate price within the ranges set forth in footnotes (3) and (5) through (10).

F11: The shares are owned directly by Atlas Venture Opportunity Fund I, L.P. ("AVOF"). Atlas Venture Associates Opportunity I, L.P. ("AVAO LP") is the general partner of AVOF. Atlas Venture Associates Opportunity I, LLC ("AVAO LLC") is the general partner of AVAO LP. The Reporting Person is a member of AVAO LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote469,364 Reported balance After 2026-06-29 transaction · row 9 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 9 · 2026-06-29 · Sale · Disposed 2,133 · Balance 469,364

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F5: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $106.0271 to $106.96 inclusive.

F11: The shares are owned directly by Atlas Venture Opportunity Fund I, L.P. ("AVOF"). Atlas Venture Associates Opportunity I, L.P. ("AVAO LP") is the general partner of AVOF. Atlas Venture Associates Opportunity I, LLC ("AVAO LLC") is the general partner of AVAO LP. The Reporting Person is a member of AVAO LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote466,666 Reported balance After 2026-06-29 transaction · row 10 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 10 · 2026-06-29 · Sale · Disposed 2,698 · Balance 466,666

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F6: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.03 to $108.0293 inclusive.

F11: The shares are owned directly by Atlas Venture Opportunity Fund I, L.P. ("AVOF"). Atlas Venture Associates Opportunity I, L.P. ("AVAO LP") is the general partner of AVOF. Atlas Venture Associates Opportunity I, LLC ("AVAO LLC") is the general partner of AVAO LP. The Reporting Person is a member of AVAO LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote465,168 Reported balance After 2026-06-29 transaction · row 11 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 11 · 2026-06-29 · Sale · Disposed 1,498 · Balance 465,168

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F7: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $108.0326 to $109.019 inclusive.

F11: The shares are owned directly by Atlas Venture Opportunity Fund I, L.P. ("AVOF"). Atlas Venture Associates Opportunity I, L.P. ("AVAO LP") is the general partner of AVOF. Atlas Venture Associates Opportunity I, LLC ("AVAO LLC") is the general partner of AVAO LP. The Reporting Person is a member of AVAO LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote464,064 Reported balance After 2026-06-29 transaction · row 12 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 12 · 2026-06-29 · Sale · Disposed 1,104 · Balance 464,064

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F8: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $109.034 to $109.96 inclusive.

F11: The shares are owned directly by Atlas Venture Opportunity Fund I, L.P. ("AVOF"). Atlas Venture Associates Opportunity I, L.P. ("AVAO LP") is the general partner of AVOF. Atlas Venture Associates Opportunity I, LLC ("AVAO LLC") is the general partner of AVAO LP. The Reporting Person is a member of AVAO LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote462,986 Reported balance After 2026-06-29 transaction · row 13 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 13 · 2026-06-29 · Sale · Disposed 1,078 · Balance 462,986

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F9: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $110.09 to $111.08 inclusive.

F11: The shares are owned directly by Atlas Venture Opportunity Fund I, L.P. ("AVOF"). Atlas Venture Associates Opportunity I, L.P. ("AVAO LP") is the general partner of AVOF. Atlas Venture Associates Opportunity I, LLC ("AVAO LLC") is the general partner of AVAO LP. The Reporting Person is a member of AVAO LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectSee footnote462,856 Reported balance After 2026-06-29 transaction · row 14 Amendment: may correct only part of an earlier disclosure.
1 source row

Row 14 · 2026-06-29 · Sale · Disposed 130 · Balance 462,856

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F10: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $111.09 to $111.63 inclusive.

F11: The shares are owned directly by Atlas Venture Opportunity Fund I, L.P. ("AVOF"). Atlas Venture Associates Opportunity I, L.P. ("AVAO LP") is the general partner of AVOF. Atlas Venture Associates Opportunity I, LLC ("AVAO LLC") is the general partner of AVAO LP. The Reporting Person is a member of AVAO LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF, except to the extent of his pecuniary interest therein, if any.

Filing footnotes · ownership attribution and instrument terms

F1: This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund X, L.P. and Atlas Venture Opportunity Fund I, L.P. on December 11, 2025.

F2: The number of shares disposed and the number of shares owned following reported transaction were inadvertently misreported on the original Form 4. This represents to correct number.

F3: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.015 to $106.0145 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold each separate price within the ranges set forth in footnotes (3) and (5) through (10).

F4: These shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. The Reporting Person is a member of AVA X LLC and disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

F5: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $106.0271 to $106.96 inclusive.

F6: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.03 to $108.0293 inclusive.

F7: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $108.0326 to $109.019 inclusive.

F8: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $109.034 to $109.96 inclusive.

F9: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $110.09 to $111.08 inclusive.

F10: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $111.09 to $111.63 inclusive.

F11: The shares are owned directly by Atlas Venture Opportunity Fund I, L.P. ("AVOF"). Atlas Venture Associates Opportunity I, L.P. ("AVAO LP") is the general partner of AVOF. Atlas Venture Associates Opportunity I, LLC ("AVAO LLC") is the general partner of AVAO LP. The Reporting Person is a member of AVAO LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF, except to the extent of his pecuniary interest therein, if any.

Larimar Therapeutics, Inc.

Report date January 03, 2018 · Filed January 05, 2018

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $5.18 · Expires 2028-01-03Direct8,509 Reported balance After 2018-01-03 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2018-01-03 · Grant · Acquired 8,509 · Balance 8,509

F1: The stock option was issued in lieu of cash fees under the Non-Employee Director Compensation Policy pursuant to a Non-Qualified Stock Option Agreement and shall vest over a period of one year starting January 1, 2018 on a quarterly basis in arrears.

Filing footnotes · ownership attribution and instrument terms

F1: The stock option was issued in lieu of cash fees under the Non-Employee Director Compensation Policy pursuant to a Non-Qualified Stock Option Agreement and shall vest over a period of one year starting January 1, 2018 on a quarterly basis in arrears.

Sionna Therapeutics, Inc.

Report date June 17, 2026 · Filed June 18, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Non-Qualified Stock Option (right to buy)SEC Table II · derivative / convertible security · Conversion / exercise price $36.73 · Expires 2036-06-16Direct17,340 Reported balance After 2026-06-17 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2026-06-17 · Grant · Acquired 17,340 · Balance 17,340

F1: 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.

F2: This option vests in full upon the earlier of June 17, 2027 or the date of the next annual meeting of Sionna Therapeutics, Inc., subject to the Reporting Person's continued service on such vesting date.

Filing footnotes · ownership attribution and instrument terms

F1: 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.

F2: This option vests in full upon the earlier of June 17, 2027 or the date of the next annual meeting of Sionna Therapeutics, Inc., subject to the Reporting Person's continued service on such vesting date.

Tectonic Therapeutic, Inc.

Report date June 06, 2023 · Filed June 08, 2023

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $1.09 · Expires 2033-06-05Direct17,643 Reported balance After 2023-06-06 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2023-06-06 · Grant · Acquired 17,643 · Balance 17,643

F1: The option shall vest in full upon the earlier of June 6, 2024 or the date of the Issuer's 2024 Annual Meeting of Stockholders, subject to the reporting person's continued service as a director through such vesting date.

F2: 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.

Filing footnotes · ownership attribution and instrument terms

F1: The option shall vest in full upon the earlier of June 6, 2024 or the date of the Issuer's 2024 Annual Meeting of Stockholders, subject to the reporting person's continued service as a director through such vesting date.

F2: 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.

Viridian Therapeutics, Inc.\DE

Report date June 27, 2018 · Filed June 28, 2018

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Stock Option (right to buy)SEC Table II · derivative / convertible security · Conversion / exercise price $6.46 · Expires 2028-06-26Direct12,000 Reported balance After 2018-06-27 transaction · row 1 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 1 · 2018-06-27 · Grant · Acquired 12,000 · Balance 12,000

F1: Automatic non-discretionary grant to the Reporting Person of a nonstatutory stock option under the Issuer's 2016 Equity Incentive Plan (the "Plan") in accordance with the Issuer's Amended and Restated Non-Employee Director Compensation Policy. One hundred percent (100%) of the shares subject to the option shall vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the next annual meeting of the Issuer's stockholders following the date of grant, subject in each case to the Reporting Person's continued service on such vesting date.

F2: This option was granted to Bruce Booth, Ph.D., a director of the Issuer. The proceeds of any sale of shares of common stock issued to Dr. Booth upon exercise of this option will be transferred to Atlas Venture Advisors, Inc. and therefore Dr. Booth disclaims beneficial ownership of such shares, which belongs to Atlas Venture Advisors, Inc.

Filing footnotes · ownership attribution and instrument terms

F1: Automatic non-discretionary grant to the Reporting Person of a nonstatutory stock option under the Issuer's 2016 Equity Incentive Plan (the "Plan") in accordance with the Issuer's Amended and Restated Non-Employee Director Compensation Policy. One hundred percent (100%) of the shares subject to the option shall vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the next annual meeting of the Issuer's stockholders following the date of grant, subject in each case to the Reporting Person's continued service on such vesting date.

F2: This option was granted to Bruce Booth, Ph.D., a director of the Issuer. The proceeds of any sale of shares of common stock issued to Dr. Booth upon exercise of this option will be transferred to Atlas Venture Advisors, Inc. and therefore Dr. Booth disclaims beneficial ownership of such shares, which belongs to Atlas Venture Advisors, Inc.

Past disclosures · reporting ended (1)

No longer tracked through insider filings. These historical balances do not imply present ownership or a zero position.

Vigil Neuroscience, Inc.

Report date August 05, 2025 · Filed August 05, 2025

Section 16 reporting ended · disclosed 2025-08-05. Current position is not established by this disclosure.

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect0 Reported balance After 2025-08-05 transaction · row 1 Account or security details depend on footnotes; rows are not merged.
1 source row

Row 1 · 2025-08-05 · Disposition to issuer · Disposed 5,000 · Balance 0

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F2: Represents Restricted Stock Units ("RSUs"), each of which represented the contingent right to receive one share of the Common Stock. Pursuant to the terms of the Merger Agreement, at the Effective Time, each RSU that is outstanding as of immediately prior to the Effective Time, to the extent unvested, was accelerated and became fully vested, and was cancelled and converted into the right to receive (i) an amount, without interest, equal to the product of (a) the total number of shares subject to such RSU immediately prior to the Effective Time, multiplied by (b) the Closing Amount and (ii) one CVR for each share subject to such RSU.

F3: The Reporting Person is a member of Atlas Venture Associates XII, LLC and is obligated to transfer the economic benefit, if any, received upon the sale of the shares issuable upon settlement of this award to Atlas Venture Life Science Advisors, LLC. As such, the Reporting Person disclaims beneficial ownership of the 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.

Common StockSEC Table I · non-derivativeIndirectBy Atlas Venture Fund XII, L.P.0 Reported balance After 2025-08-05 transaction · row 2 Account identity is unresolved; indirect or unspecified ownership is not merged.
1 source row

Row 2 · 2025-08-05 · Disposition to issuer · Disposed 4,808,896 · Balance 0

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F4: These shares are held directly by Atlas Venture Fund XII, L.P. ("Atlas Venture Fund XII"). The general partner of Atlas Venture Fund XII is Atlas Venture Associates XII, L.P. ("AVA XII LP"). Atlas Venture Associates XII, LLC ("AVA XII LLC") is the general partner of AVA XII LP. The Reporting Person is a member of AVA XII LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund XII, except to the extent of his pecuniary interest therein, if any.

Common StockSEC Table I · non-derivativeIndirectBy Atlas Venture Opportunity Fund I, L.P.0 Reported balance After 2025-08-05 transaction · row 3 Account identity is unresolved; indirect or unspecified ownership is not merged.
1 source row

Row 3 · 2025-08-05 · Disposition to issuer · Disposed 1,027,978 · Balance 0

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F5: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

Stock Option Award (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $3.03Direct0 Reported balance After 2025-08-05 transaction · row 4 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 4 · 2025-08-05 · Disposition to issuer · Disposed 7,577 · Balance 0

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F5: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

F6: Pursuant to the terms of the Merger Agreement, at the Effective Time, each stock option that was outstanding as of immediately prior to the Effective Time, to the extent unvested, was accelerated and became fully vested. Each stock option having an exercise price per share that was less than the Closing Amount was cancelled and converted into the right to receive (i) an amount, without interest, equal to the product of (a) the total number of shares subject to such option immediately prior to the Effective Time, multiplied by (b) the excess of (1) the Closing Amount over (2) the exercise price per share under such option and (ii) one CVR for each share subject to such option.

F3: The Reporting Person is a member of Atlas Venture Associates XII, LLC and is obligated to transfer the economic benefit, if any, received upon the sale of the shares issuable upon settlement of this award to Atlas Venture Life Science Advisors, LLC. As such, the Reporting Person disclaims beneficial ownership of the 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.

Stock Option Award (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $3.03Direct0 Reported balance After 2025-08-05 transaction · row 5 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 5 · 2025-08-05 · Disposition to issuer · Disposed 12,155 · Balance 0

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F5: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

F6: Pursuant to the terms of the Merger Agreement, at the Effective Time, each stock option that was outstanding as of immediately prior to the Effective Time, to the extent unvested, was accelerated and became fully vested. Each stock option having an exercise price per share that was less than the Closing Amount was cancelled and converted into the right to receive (i) an amount, without interest, equal to the product of (a) the total number of shares subject to such option immediately prior to the Effective Time, multiplied by (b) the excess of (1) the Closing Amount over (2) the exercise price per share under such option and (ii) one CVR for each share subject to such option.

F3: The Reporting Person is a member of Atlas Venture Associates XII, LLC and is obligated to transfer the economic benefit, if any, received upon the sale of the shares issuable upon settlement of this award to Atlas Venture Life Science Advisors, LLC. As such, the Reporting Person disclaims beneficial ownership of the 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.

Stock Option Award (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $3.03Direct0 Reported balance After 2025-08-05 transaction · row 6 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 6 · 2025-08-05 · Disposition to issuer · Disposed 9,713 · Balance 0

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F5: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

F6: Pursuant to the terms of the Merger Agreement, at the Effective Time, each stock option that was outstanding as of immediately prior to the Effective Time, to the extent unvested, was accelerated and became fully vested. Each stock option having an exercise price per share that was less than the Closing Amount was cancelled and converted into the right to receive (i) an amount, without interest, equal to the product of (a) the total number of shares subject to such option immediately prior to the Effective Time, multiplied by (b) the excess of (1) the Closing Amount over (2) the exercise price per share under such option and (ii) one CVR for each share subject to such option.

F3: The Reporting Person is a member of Atlas Venture Associates XII, LLC and is obligated to transfer the economic benefit, if any, received upon the sale of the shares issuable upon settlement of this award to Atlas Venture Life Science Advisors, LLC. As such, the Reporting Person disclaims beneficial ownership of the 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.

Stock Option Award (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $3.03Direct0 Reported balance After 2025-08-05 transaction · row 7 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 7 · 2025-08-05 · Disposition to issuer · Disposed 13,928 · Balance 0

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F5: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

F6: Pursuant to the terms of the Merger Agreement, at the Effective Time, each stock option that was outstanding as of immediately prior to the Effective Time, to the extent unvested, was accelerated and became fully vested. Each stock option having an exercise price per share that was less than the Closing Amount was cancelled and converted into the right to receive (i) an amount, without interest, equal to the product of (a) the total number of shares subject to such option immediately prior to the Effective Time, multiplied by (b) the excess of (1) the Closing Amount over (2) the exercise price per share under such option and (ii) one CVR for each share subject to such option.

F3: The Reporting Person is a member of Atlas Venture Associates XII, LLC and is obligated to transfer the economic benefit, if any, received upon the sale of the shares issuable upon settlement of this award to Atlas Venture Life Science Advisors, LLC. As such, the Reporting Person disclaims beneficial ownership of the 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.

Stock Option Award (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $3.39Direct0 Reported balance After 2025-08-05 transaction · row 8 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 8 · 2025-08-05 · Disposition to issuer · Disposed 34,612 · Balance 0

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F5: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

F6: Pursuant to the terms of the Merger Agreement, at the Effective Time, each stock option that was outstanding as of immediately prior to the Effective Time, to the extent unvested, was accelerated and became fully vested. Each stock option having an exercise price per share that was less than the Closing Amount was cancelled and converted into the right to receive (i) an amount, without interest, equal to the product of (a) the total number of shares subject to such option immediately prior to the Effective Time, multiplied by (b) the excess of (1) the Closing Amount over (2) the exercise price per share under such option and (ii) one CVR for each share subject to such option.

F3: The Reporting Person is a member of Atlas Venture Associates XII, LLC and is obligated to transfer the economic benefit, if any, received upon the sale of the shares issuable upon settlement of this award to Atlas Venture Life Science Advisors, LLC. As such, the Reporting Person disclaims beneficial ownership of the 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.

Stock Option Award (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $3.38Direct0 Reported balance After 2025-08-05 transaction · row 9 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 9 · 2025-08-05 · Disposition to issuer · Disposed 18,068 · Balance 0

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F5: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

F6: Pursuant to the terms of the Merger Agreement, at the Effective Time, each stock option that was outstanding as of immediately prior to the Effective Time, to the extent unvested, was accelerated and became fully vested. Each stock option having an exercise price per share that was less than the Closing Amount was cancelled and converted into the right to receive (i) an amount, without interest, equal to the product of (a) the total number of shares subject to such option immediately prior to the Effective Time, multiplied by (b) the excess of (1) the Closing Amount over (2) the exercise price per share under such option and (ii) one CVR for each share subject to such option.

F3: The Reporting Person is a member of Atlas Venture Associates XII, LLC and is obligated to transfer the economic benefit, if any, received upon the sale of the shares issuable upon settlement of this award to Atlas Venture Life Science Advisors, LLC. As such, the Reporting Person disclaims beneficial ownership of the 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.

Stock Option Award (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $2.19Direct0 Reported balance After 2025-08-05 transaction · row 10 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 10 · 2025-08-05 · Disposition to issuer · Disposed 48,393 · Balance 0

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F5: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

F6: Pursuant to the terms of the Merger Agreement, at the Effective Time, each stock option that was outstanding as of immediately prior to the Effective Time, to the extent unvested, was accelerated and became fully vested. Each stock option having an exercise price per share that was less than the Closing Amount was cancelled and converted into the right to receive (i) an amount, without interest, equal to the product of (a) the total number of shares subject to such option immediately prior to the Effective Time, multiplied by (b) the excess of (1) the Closing Amount over (2) the exercise price per share under such option and (ii) one CVR for each share subject to such option.

F3: The Reporting Person is a member of Atlas Venture Associates XII, LLC and is obligated to transfer the economic benefit, if any, received upon the sale of the shares issuable upon settlement of this award to Atlas Venture Life Science Advisors, LLC. As such, the Reporting Person disclaims beneficial ownership of the 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.

Filing footnotes · ownership attribution and instrument terms

F1: This Form 4 reports securities disposed pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, Sanofi ("Parent"), and Vesper Acquisition Sub Inc., a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, on August 5, 2025 (the "Effective Time"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. At the Effective Time, each share of Issuer Common Stock issued and outstanding immediately prior to the Effective Time was converted into the right to receive (i) $8.00 per share of Common Stock in cash, without interest (the "Closing Amount") plus (ii) one contingent value right ("CVR"), representing the right to receive $2.00 payable in cash, conditioned upon satisfaction of a certain clinical milestone (together with the Closing Amount, the "Merger Consideration").

F2: Represents Restricted Stock Units ("RSUs"), each of which represented the contingent right to receive one share of the Common Stock. Pursuant to the terms of the Merger Agreement, at the Effective Time, each RSU that is outstanding as of immediately prior to the Effective Time, to the extent unvested, was accelerated and became fully vested, and was cancelled and converted into the right to receive (i) an amount, without interest, equal to the product of (a) the total number of shares subject to such RSU immediately prior to the Effective Time, multiplied by (b) the Closing Amount and (ii) one CVR for each share subject to such RSU.

F3: The Reporting Person is a member of Atlas Venture Associates XII, LLC and is obligated to transfer the economic benefit, if any, received upon the sale of the shares issuable upon settlement of this award to Atlas Venture Life Science Advisors, LLC. As such, the Reporting Person disclaims beneficial ownership of the 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.

F4: These shares are held directly by Atlas Venture Fund XII, L.P. ("Atlas Venture Fund XII"). The general partner of Atlas Venture Fund XII is Atlas Venture Associates XII, L.P. ("AVA XII LP"). Atlas Venture Associates XII, LLC ("AVA XII LLC") is the general partner of AVA XII LP. The Reporting Person is a member of AVA XII LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund XII, except to the extent of his pecuniary interest therein, if any.

F5: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. The Reporting Person is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

F6: Pursuant to the terms of the Merger Agreement, at the Effective Time, each stock option that was outstanding as of immediately prior to the Effective Time, to the extent unvested, was accelerated and became fully vested. Each stock option having an exercise price per share that was less than the Closing Amount was cancelled and converted into the right to receive (i) an amount, without interest, equal to the product of (a) the total number of shares subject to such option immediately prior to the Effective Time, multiplied by (b) the excess of (1) the Closing Amount over (2) the exercise price per share under such option and (ii) one CVR for each share subject to such option.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
July 01, 2020 Filed Jul 6, 2020 20:52 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 61,338 $0.31 Strike: $0.47 $19,125.19
Disclosure

SEC source: 0001209191-20-041045 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,338

Underlying: Common Stock · 61,338 shares

Expires 2030-07-01

F1 · shares: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2 · derivative.exercise_date: This option is fully vested at time of grant.

F3 · 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 Advisors, LLC and as such, the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of this pecuniary interest therein, if any.

Read SEC document
June 29, 2020 Filed Jul 1, 2020 20:48 UTC Dianthus Therapeutics, Inc. /DE/ MGTA · Entity 1813 PurchaseCommon Stock 1,250,000 $8.00 $10,000,000.00
Disclosure

SEC source: 0001209191-20-039768 · doc4.xml · nonDerivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,250,000

F1 · ownership.nature: The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas Venture Opportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") is the general partner of AVAO I LP. Dr. Booth is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.

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June 09, 2020 Filed Jun 11, 2020 20:23 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 14,331 $0.00 Strike: $0.63 $0.00
Disclosure

SEC source: 0001209191-20-035925 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,331

Underlying: Common Stock · 14,331 shares

Expires 2030-06-09

F1 · derivative.exercise_date: This option shall vest in full on the earlier of (i) June 9, 2021, and (ii) the next annual meeting of the Issuer's stockholders.

F2 · balance_after: 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 Advisors, LLC and as such, the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of this pecuniary interest therein, if any.

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June 05, 2020 Filed Jun 9, 2020 20:25 UTC Dianthus Therapeutics, Inc. /DE/ MGTA · Entity 1813 GrantStock Option (Right to Buy) · Derivative 18,188 $0.00 Strike: $9.99 $0.00
Disclosure

SEC source: 0000899243-20-015798 · 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 2030-06-04

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 5, 2021 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.

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June 04, 2020 Filed Jun 5, 2020 21:18 UTC Tectonic Therapeutic, Inc. AVRO · Entity 5328 GrantStock Option (Right to Buy) · Derivative 14,000 $0.00 Strike: $21.91 $0.00
Disclosure

SEC source: 0001127602-20-019028 · form4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,000

Underlying: Common Stock · 14,000 shares

Expires 2030-06-03

F1 · derivative.exercise_date: The option shall vest in full upon the earlier of June 4, 2021 or the date of the Issuer's 2021 Annual Meeting of Stockholders, subject to the reporting person's continued service as a director through such vesting date.

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.

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April 06, 2020 Filed Apr 8, 2020 21:40 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 86,735 $0.22 Strike: $0.35 $19,125.07
Disclosure

SEC source: 0001209191-20-023944 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 86,735

Underlying: Common Stock · 86,735 shares

Expires 2030-04-06

F1 · shares: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2 · derivative.exercise_date: This option is fully vested at time of grant.

F3 · 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 Advisors, LLC and as such, the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of this pecuniary interest therein, if any.

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January 02, 2020 Filed Jan 6, 2020 21:45 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 39,996 $0.45 Strike: $0.72 $18,126.19
Disclosure

SEC source: 0001209191-20-001886 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,996

Underlying: Common Stock · 39,996 shares

Expires 2030-01-02

F1 · shares: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2 · derivative.exercise_date: This option is fully vested at time of grant.

F3 · 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 Advisors, LLC and as such, the Reporting Person disclaims beneficial ownership of the 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.

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October 01, 2019 Filed Oct 3, 2019 20:39 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 20,611 $0.88 Strike: $1.41 $18,125.31
Disclosure

SEC source: 0001209191-19-052255 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,611

Underlying: Common Stock · 20,611 shares

Expires 2029-10-01

F1 · shares: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2 · derivative.exercise_date: This option is fully vested at time of grant.

F3 · 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 Advisors, LLC and as such, the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of this pecuniary interest therein, if any.

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July 19, 2019 Filed Jul 23, 2019 20:09 UTC Tectonic Therapeutic, Inc. AVRO · Entity 5328 PurchaseCommon Stock 810,811 $18.50 $15,000,003.50
Disclosure

SEC source: 0000899243-19-020100 · doc4.xml · nonDerivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 5,567,289

F1 · ownership.nature: The shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

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July 01, 2019 Filed Jul 3, 2019 20:05 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 10,285 $1.77 Strike: $2.41 $18,250.73
Disclosure

SEC source: 0001209191-19-041040 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,285

Underlying: Common Stock · 10,285 shares

Expires 2029-07-01

F1 · shares: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2 · derivative.exercise_date: This option is fully vested at time of grant.

F3 · 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 Advisors, LLC and as such, the Reporting Person disclaims beneficial ownership of the 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.

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June 18, 2019 Filed Jun 20, 2019 20:14 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 14,331 $0.00 Strike: $2.70 $0.00
Disclosure

SEC source: 0001209191-19-038217 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,331

Underlying: Common Stock · 14,331 shares

Expires 2029-06-18

F1 · derivative.exercise_date: This option shall vest in full on the earlier of (i) June 18, 2020, and (ii) 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 Advisors, LLC and as such, the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of this pecuniary interest therein, if any.

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June 11, 2019 Filed Jun 13, 2019 21:08 UTC Tectonic Therapeutic, Inc. AVRO · Entity 5328 GrantStock Option (Right to Buy) · Derivative 9,675 $0.00 Strike: $13.60 $0.00
Disclosure

SEC source: 0000899243-19-016853 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,675

Underlying: Common Stock · 9,675 shares

Expires 2029-06-10

F1 · derivative.exercise_date: The option shall vest in full upon the earlier of June 11, 2020 or the date of the Issuer's 2020 Annual Meeting of Stockholders, subject to the reporting person's continued service as a director through such vesting date.

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.

Read SEC document
June 07, 2019 Filed Jun 11, 2019 21:07 UTC Dianthus Therapeutics, Inc. /DE/ MGTA · Entity 1813 GrantStock Option (Right to Buy) · Derivative 18,188 $0.00 Strike: $13.40 $0.00
Disclosure

SEC source: 0000899243-19-016414 · 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 2029-06-06

F1 · derivative.exercise_date: This option shall vest and become exercisable in full upon the earlier to occur of (a) June 7, 2020 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.

Read SEC document
April 01, 2019 Filed Apr 3, 2019 20:24 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 6,714 $2.72 Strike: $4.40 $18,252.01
Disclosure

SEC source: 0001209191-19-023119 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,714

Underlying: Common Stock · 6,714 shares

Expires 2029-04-01

F1 · shares: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2 · derivative.exercise_date: This option is fully vested at time of grant.

F3 · 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 Advisors, LLC and as such, the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of this pecuniary interest therein, if any.

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March 20, 2019 Filed Mar 22, 2019 21:01 UTC Dianthus Therapeutics, Inc. /DE/ MGTA · Entity 1813 SaleCommon Stock 14,245 $17.86 $254,415.70
Disclosure

SEC source: 0001209191-19-021014 · doc4.xml · nonDerivative · entry 3

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold by AVA X LP in multiple transactions at prices ranging from $17.75 to $18.14, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of 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.

F4 · ownership.nature: The shares are held directly by AVA X LP. AVA X LLC is the general partner of AVA X LP. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by AVF X and AVA X LP, except to the extent of his pecuniary interest therein, if any.

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March 20, 2019 Filed Mar 22, 2019 21:01 UTC Dianthus Therapeutics, Inc. /DE/ MGTA · Entity 1813 OtherCommon Stock 14,245 $0.00 $0.00
Disclosure

SEC source: 0001209191-19-021014 · doc4.xml · nonDerivative · entry 2

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 14,245

F3 · kind: Represents the shares received by AVA X LP in connection with the pro rata distribution described in footnote 1 by AVF X.

F4 · ownership.nature: The shares are held directly by AVA X LP. AVA X LLC is the general partner of AVA X LP. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by AVF X and AVA X LP, except to the extent of his pecuniary interest therein, if any.

Read SEC document
March 20, 2019 Filed Mar 22, 2019 21:01 UTC Dianthus Therapeutics, Inc. /DE/ MGTA · Entity 1813 OtherCommon Stock 726,500 $0.00 $0.00
Disclosure

SEC source: 0001209191-19-021014 · doc4.xml · nonDerivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 4,117,125

F1 · kind: Represents 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.

F2 · ownership.nature: 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by AVF X and AVA X LP, except to the extent of his pecuniary interest therein, if any.

Read SEC document
January 02, 2019 Filed Jan 4, 2019 21:52 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 6,757 $2.70 Strike: $4.47 $18,243.90
Disclosure

SEC source: 0001209191-19-002040 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,757

Underlying: Common Stock · 6,757 shares

Expires 2029-01-02

F1 · shares: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2 · derivative.exercise_date: This option is fully vested at time of grant.

F3 · 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 Advisors, LLC and therefore the Reporting Person disclaims beneficial ownership of such shares.

Read SEC document
October 01, 2018 Filed Oct 3, 2018 21:12 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 2,935 $6.22 Strike: $10.37 $18,255.70
Disclosure

SEC source: 0001209191-18-053961 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,935

Underlying: Common Stock · 2,935 shares

Expires 2028-10-01

F1 · shares: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2 · derivative.exercise_date: This option is fully vested at time of grant.

F3 · 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 Advisors, LLC and therefore the Reporting Person disclaims beneficial ownership of such shares.

Read SEC document
July 26, 2018 Filed Sep 26, 2018 22:39 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 GrantStock Option (Right to Buy) · Derivative 2,092 $8.72 Strike: $14.57 $18,242.24
Disclosure

SEC source: 0001209191-18-052356 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,092

Underlying: Common Stock · 2,092 shares

Expires 2028-07-26

F1 · shares: The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant.

F2 · derivative.exercise_date: This option is fully vested at time of grant.

F3 · 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 Advisors, LLC and therefore the Reporting Person disclaims beneficial ownership of such shares.

Read SEC document
June 27, 2018 Filed Jun 28, 2018 20:31 UTC Viridian Therapeutics, Inc.\DE MGEN · Entity 4316 GrantStock Option (right to buy) · Derivative 12,000 $0.00 Strike: $6.46 $0.00
Disclosure

SEC source: 0001209191-18-039868 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,000

Underlying: Common Stock · 12,000 shares

Expires 2028-06-26

F1 · derivative.exercise_date: Automatic non-discretionary grant to the Reporting Person of a nonstatutory stock option under the Issuer's 2016 Equity Incentive Plan (the "Plan") in accordance with the Issuer's Amended and Restated Non-Employee Director Compensation Policy. One hundred percent (100%) of the shares subject to the option shall vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the next annual meeting of the Issuer's stockholders following the date of grant, subject in each case to the Reporting Person's continued service on such vesting date.

F2 · ownership.direct: This option was granted to Bruce Booth, Ph.D., a director of the Issuer. The proceeds of any sale of shares of common stock issued to Dr. Booth upon exercise of this option will be transferred to Atlas Venture Advisors, Inc. and therefore Dr. Booth disclaims beneficial ownership of such shares, which belongs to Atlas Venture Advisors, Inc.

Read SEC document
June 25, 2018 Filed Jun 25, 2018 22:15 UTC Tectonic Therapeutic, Inc. AVRO · Entity 5328 ConversionSeries B Preferred Stock · Derivative 3,740,239 $0.00 $0.00
Disclosure

SEC source: 0000899243-18-017963 · doc4.xml · derivative · entry 6

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Common Stock · 905,188 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.

F3 · derivative.exercise_price: Represents the total number of shares of Common Stock received by Atlas Venture Fund X upon the conversion of the Issuer's Series A Preferred Stock in connection with the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: All series of Convertible Preferred Stock automatically converted into the Issuer's Common Stock on a 4.132-for-1 basis on June 25, 2018 and had no expiration date.

F5 · derivative.expiration_date: All series of Convertible Preferred Stock automatically converted into the Issuer's Common Stock on a 4.132-for-1 basis on June 25, 2018 and had no expiration date.

F5 · derivative.underlying_shares: All series of Convertible Preferred Stock automatically converted into the Issuer's Common Stock on a 4.132-for-1 basis on June 25, 2018 and had no expiration date.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Read SEC document
June 25, 2018 Filed Jun 25, 2018 22:15 UTC Tectonic Therapeutic, Inc. AVRO · Entity 5328 ConversionSeries A Preferred Stock · Derivative 12,580,199 $0.00 $0.00
Disclosure

SEC source: 0000899243-18-017963 · doc4.xml · derivative · entry 5

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Common Stock · 3,044,579 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.

F3 · derivative.exercise_price: Represents the total number of shares of Common Stock received by Atlas Venture Fund X upon the conversion of the Issuer's Series A Preferred Stock in connection with the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: All series of Convertible Preferred Stock automatically converted into the Issuer's Common Stock on a 4.132-for-1 basis on June 25, 2018 and had no expiration date.

F5 · derivative.expiration_date: All series of Convertible Preferred Stock automatically converted into the Issuer's Common Stock on a 4.132-for-1 basis on June 25, 2018 and had no expiration date.

F5 · derivative.underlying_shares: All series of Convertible Preferred Stock automatically converted into the Issuer's Common Stock on a 4.132-for-1 basis on June 25, 2018 and had no expiration date.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Read SEC document
June 25, 2018 Filed Jun 25, 2018 22:15 UTC Tectonic Therapeutic, Inc. AVRO · Entity 5328 ConversionSeries Seed Preferred Stock · Derivative 3,333,333 $0.00 $0.00
Disclosure

SEC source: 0000899243-18-017963 · doc4.xml · derivative · entry 4

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Common Stock · 806,711 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.

F3 · derivative.exercise_price: Represents the total number of shares of Common Stock received by Atlas Venture Fund X upon the conversion of the Issuer's Series A Preferred Stock in connection with the closing of the Issuer's initial public offering.

F5 · derivative.exercise_date: All series of Convertible Preferred Stock automatically converted into the Issuer's Common Stock on a 4.132-for-1 basis on June 25, 2018 and had no expiration date.

F5 · derivative.expiration_date: All series of Convertible Preferred Stock automatically converted into the Issuer's Common Stock on a 4.132-for-1 basis on June 25, 2018 and had no expiration date.

F5 · derivative.underlying_shares: All series of Convertible Preferred Stock automatically converted into the Issuer's Common Stock on a 4.132-for-1 basis on June 25, 2018 and had no expiration date.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Read SEC document
June 25, 2018 Filed Jun 25, 2018 22:15 UTC Tectonic Therapeutic, Inc. AVRO · Entity 5328 ConversionCommon Stock 905,188 Not disclosed Not disclosed
Disclosure

SEC source: 0000899243-18-017963 · doc4.xml · nonDerivative · entry 3

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 4,756,478

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.

F4 · price: Represents the total number of shares of Common Stock received by Atlas Venture Fund X upon the conversion of the Issuer's Series B Preferred Stock in connection with the closing of the Issuer's initial public offering.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Read SEC document
June 25, 2018 Filed Jun 25, 2018 22:15 UTC Tectonic Therapeutic, Inc. AVRO · Entity 5328 ConversionCommon Stock 3,044,579 Not disclosed Not disclosed
Disclosure

SEC source: 0000899243-18-017963 · doc4.xml · nonDerivative · entry 2

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 3,851,290

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.

F3 · price: Represents the total number of shares of Common Stock received by Atlas Venture Fund X upon the conversion of the Issuer's Series A Preferred Stock in connection with the closing of the Issuer's initial public offering.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Read SEC document
June 25, 2018 Filed Jun 25, 2018 22:15 UTC Tectonic Therapeutic, Inc. AVRO · Entity 5328 ConversionCommon Stock 806,711 Not disclosed Not disclosed
Disclosure

SEC source: 0000899243-18-017963 · doc4.xml · nonDerivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 806,711

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: Represents the total number of shares of Common Stock received by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"), upon the conversion of the Issuer's Series Seed Preferred Stock in connection with the closing of the Issuer's initial public offering.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Read SEC document
June 25, 2018 Filed Jun 27, 2018 20:28 UTC Dianthus Therapeutics, Inc. /DE/ MGTA · Entity 1813 ConversionSeries B Preferred Stock · Derivative 204,339 Not disclosed Not disclosed
Disclosure

SEC source: 0000899243-18-018328 · doc4.xml · derivative · entry 3

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 79,079 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 Series A Preferred Stock and Series B Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · price: The Series A Preferred Stock and Series B Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.exercise_date: The Series A Preferred Stock and Series B Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: The Series A Preferred Stock and Series B Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F2 · ownership.direct: The shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Read SEC document
June 25, 2018 Filed Jun 27, 2018 20:28 UTC Dianthus Therapeutics, Inc. /DE/ MGTA · Entity 1813 ConversionSeries A Preferred Stock · Derivative 12,061,496 Not disclosed Not disclosed
Disclosure

SEC source: 0000899243-18-018328 · doc4.xml · derivative · entry 2

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 4,667,797 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 Series A Preferred Stock and Series B Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · price: The Series A Preferred Stock and Series B Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.exercise_date: The Series A Preferred Stock and Series B Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: The Series A Preferred Stock and Series B Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F2 · ownership.direct: The shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Read SEC document
June 25, 2018 Filed Jun 27, 2018 20:28 UTC Dianthus Therapeutics, Inc. /DE/ MGTA · Entity 1813 ConversionCommon Stock 4,746,876 Not disclosed Not disclosed
Disclosure

SEC source: 0000899243-18-018328 · doc4.xml · nonDerivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 4,843,625

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 Series A Preferred Stock and Series B Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F2 · ownership.direct: The shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund 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. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund X, except to the extent of his pecuniary interest therein, if any.

Read SEC document
April 03, 2018 Filed Apr 3, 2018 21:07 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 ConversionSeries B Preferred Stock · Derivative 83,037 $0.00 $0.00
Disclosure

SEC source: 0000899243-18-009260 · doc4.xml · derivative · entry 5

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 83,037 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: Each share automatically converted into Common Stock, for no additional consideration, on a 1.5701314513884-for-1 basis at the closing of the Issuer's initial public offering. The shares had no expiration date.

F1 · derivative.exercise_date: Each share automatically converted into Common Stock, for no additional consideration, on a 1.5701314513884-for-1 basis at the closing of the Issuer's initial public offering. The shares had no expiration date.

F1 · derivative.expiration_date: Each share automatically converted into Common Stock, for no additional consideration, on a 1.5701314513884-for-1 basis at the closing of the Issuer's initial public offering. The shares had no expiration date.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund IX, L.P. ("Atlas Venture Fund IX"). The general partner of Atlas Venture Fund IX is Atlas Venture Associates IX, L.P. ("AVA IX LP"). Atlas Venture Associates IX, LLC ("AVA IX LLC") is the general partner of AVA IX LP. Dr. Booth is a member of AVA IX LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund IX, except to the extent of his pecuniary interest therein, if any.

Read SEC document
April 03, 2018 Filed Apr 3, 2018 21:07 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 ConversionSeries A Preferred Stock · Derivative 3,184,446 $0.00 $0.00
Disclosure

SEC source: 0000899243-18-009260 · doc4.xml · derivative · entry 4

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Common Stock · 3,184,446 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: Each share automatically converted into Common Stock, for no additional consideration, on a 1.5701314513884-for-1 basis at the closing of the Issuer's initial public offering. The shares had no expiration date.

F1 · derivative.exercise_date: Each share automatically converted into Common Stock, for no additional consideration, on a 1.5701314513884-for-1 basis at the closing of the Issuer's initial public offering. The shares had no expiration date.

F1 · derivative.expiration_date: Each share automatically converted into Common Stock, for no additional consideration, on a 1.5701314513884-for-1 basis at the closing of the Issuer's initial public offering. The shares had no expiration date.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund IX, L.P. ("Atlas Venture Fund IX"). The general partner of Atlas Venture Fund IX is Atlas Venture Associates IX, L.P. ("AVA IX LP"). Atlas Venture Associates IX, LLC ("AVA IX LLC") is the general partner of AVA IX LP. Dr. Booth is a member of AVA IX LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund IX, except to the extent of his pecuniary interest therein, if any.

Read SEC document
April 03, 2018 Filed Apr 3, 2018 21:07 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 PurchaseCommon Stock 94,052 $12.00 $1,128,624.00
Disclosure

SEC source: 0000899243-18-009260 · doc4.xml · nonDerivative · entry 3

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 3,361,535

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund IX, L.P. ("Atlas Venture Fund IX"). The general partner of Atlas Venture Fund IX is Atlas Venture Associates IX, L.P. ("AVA IX LP"). Atlas Venture Associates IX, LLC ("AVA IX LLC") is the general partner of AVA IX LP. Dr. Booth is a member of AVA IX LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund IX, except to the extent of his pecuniary interest therein, if any.

Read SEC document
April 03, 2018 Filed Apr 3, 2018 21:07 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 ConversionCommon Stock 83,037 Not disclosed Not disclosed
Disclosure

SEC source: 0000899243-18-009260 · doc4.xml · nonDerivative · entry 2

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 3,267,483

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: Each share automatically converted into Common Stock, for no additional consideration, on a 1.5701314513884-for-1 basis at the closing of the Issuer's initial public offering. The shares had no expiration date.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund IX, L.P. ("Atlas Venture Fund IX"). The general partner of Atlas Venture Fund IX is Atlas Venture Associates IX, L.P. ("AVA IX LP"). Atlas Venture Associates IX, LLC ("AVA IX LLC") is the general partner of AVA IX LP. Dr. Booth is a member of AVA IX LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund IX, except to the extent of his pecuniary interest therein, if any.

Read SEC document
April 03, 2018 Filed Apr 3, 2018 21:07 UTC Cogent Biosciences, Inc. UMRX · Entity 3793 ConversionCommon Stock 3,184,446 Not disclosed Not disclosed
Disclosure

SEC source: 0000899243-18-009260 · doc4.xml · nonDerivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 3,184,446

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: Each share automatically converted into Common Stock, for no additional consideration, on a 1.5701314513884-for-1 basis at the closing of the Issuer's initial public offering. The shares had no expiration date.

F2 · ownership.nature: The shares are held directly by Atlas Venture Fund IX, L.P. ("Atlas Venture Fund IX"). The general partner of Atlas Venture Fund IX is Atlas Venture Associates IX, L.P. ("AVA IX LP"). Atlas Venture Associates IX, LLC ("AVA IX LLC") is the general partner of AVA IX LP. Dr. Booth is a member of AVA IX LLC and disclaims beneficial ownership of such securities held by Atlas Venture Fund IX, except to the extent of his pecuniary interest therein, if any.

Read SEC document
February 13, 2018 Filed Feb 13, 2018 21:59 UTC Viridian Therapeutics, Inc.\DE MGEN · Entity 4316 PurchaseCommon Stock 545,454 $5.50 $2,999,997.00
Disclosure

SEC source: 0001209191-18-009617 · doc4.xml · nonDerivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,351,090

F1 · shares: Represents shares purchased through the Issuer's follow-on public offering.

F2 · ownership.nature: The shares are held by Atlas Venture Fund X, L.P. ("Atlas Venture X"). Atlas Venture Associates X, L.P. ("AVA X LP"), is the general partner of Atlas Venture X, and 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 Atlas Venture X, except to the extent of its pecuniary interest therein, if any.

Read SEC document
January 03, 2018 Filed Jan 5, 2018 21:59 UTC Larimar Therapeutics, Inc. ZFGN · Entity 5634 GrantStock Option (Right to Buy) · Derivative 8,509 $0.00 Strike: $5.18 $0.00
Disclosure

SEC source: 0000899243-18-000593 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,509

Underlying: Common Stock · 8,509 shares

Expires 2028-01-03

F1 · derivative.exercise_date: The stock option was issued in lieu of cash fees under the Non-Employee Director Compensation Policy pursuant to a Non-Qualified Stock Option Agreement and shall vest over a period of one year starting January 1, 2018 on a quarterly basis in arrears.

Read SEC document
January 03, 2018 Filed Jan 5, 2018 21:22 UTC Viridian Therapeutics, Inc.\DE MGEN · Entity 4316 GrantStock Option (right to buy) · Derivative 10,191 $0.00 Strike: $9.72 $0.00
Disclosure

SEC source: 0001209191-18-002462 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,191

Underlying: Common Stock · 10,191 shares

Expires 2028-01-02

F1 · derivative.exercise_date: Grant to the Reporting Person of a stock option under the Issuer's 2016 Equity Incentive Plan (the "Plan"). The shares vest in four equal quarterly installments beginning on January 1, 2018 through December 31, 2018, provided that at the relevant vesting dates the Reporting Person's continuous service to the Issuer has not been terminated as defined in and as determined under the Plan. The option expires 10 years after the date of grant.

F2 · ownership.direct: This option was granted to Bruce Booth, a director of the Issuer. The proceeds of any sale of shares of common stock issued to Mr. Booth upon exercise of this option will be transferred to Atlas Venture Advisors, Inc. and therefore Mr. Booth disclaims beneficial ownership of such shares, which belongs to Atlas Venture Advisors, Inc.

Read SEC document
June 28, 2017 Filed Jun 30, 2017 21:19 UTC Viridian Therapeutics, Inc.\DE MGEN · Entity 4316 GrantStock Option (right to buy) · Derivative 12,000 $0.00 Strike: $12.06 $0.00
Disclosure

SEC source: 0001209191-17-042569 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,000

Underlying: Common Stock · 12,000 shares

Expires 2027-06-27

F1 · derivative.exercise_date: Automatic non-discretionary grant to the Reporting Person of a nonstatutory stock option under the Issuer's 2016 Equity Incentive Plan (the "Plan") in accordance with the Issuer's Amended and Restated Non-Employee Director Compensation Policy. One hundred percent (100%) of the shares subject to the option shall vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the next annual meeting of the Issuer's stockholders following the date of grant, subject in each case to the Reporting Person's continued service on such vesting date.

F2 · ownership.direct: This option was granted to Bruce Booth, Ph.D., a director of the Issuer. The proceeds of any sale of shares of common stock issued to Dr. Booth upon exercise of this option will be transferred to Atlas Venture Advisors, Inc. and therefore Dr. Booth disclaims beneficial ownership of such shares, which belongs to Atlas Venture Advisors, Inc.

Read SEC document
June 21, 2017 Filed Jun 23, 2017 20:10 UTC Larimar Therapeutics, Inc. ZFGN · Entity 5634 GrantStock Option (Right to Buy) · Derivative 14,500 $0.00 Strike: $3.95 $0.00
Disclosure

SEC source: 0000899243-17-017079 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,500

Underlying: Common Stock · 14,500 shares

Expires 2027-06-21

F1 · derivative.exercise_date: These options were issued under the nonemployee director compensation policy and will vest in full upon the earlier of June 21, 2018 or the date of the 2018 annual meeting of stockholders, subject to the director's continued service on the board of directors.

Read SEC document
March 24, 2017 Filed Mar 28, 2017 21:17 UTC Viridian Therapeutics, Inc.\DE MGEN · Entity 4316 GrantStock Option (right to buy) · Derivative 6,844 $0.00 Strike: $11.80 $0.00
Disclosure

SEC source: 0001209191-17-023171 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,844

Underlying: Common Stock · 6,844 shares

Expires 2027-03-23

F1 · derivative.exercise_date: Grant to the Reporting Person of a stock option under the Issuer's 2016 Equity Incentive Plan (the "Plan"). The shares vest in three equal quarterly installments beginning on April 1, 2017 through December 31, 2017, provided that at the relevant vesting dates the Reporting Person's continuous service to the Issuer has not been terminated as defined in and as determined under the Plan. The option expires 10 years after the date of grant.

F2 · ownership.direct: This option was granted to Bruce Booth, a director of the Issuer. The proceeds of any sale of shares of common stock issued to Mr. Booth upon exercise of this option will be transferred to Atlas Venture Advisors, Inc. and therefore Mr. Booth disclaims beneficial ownership of such shares, which belongs to Atlas Venture Advisors, Inc.

Read SEC document
February 13, 2017 Filed Feb 15, 2017 01:17 UTC Larimar Therapeutics, Inc. ZFGN · Entity 5634 GrantStock Option (Right to Buy) · Derivative 12,003 $0.00 Strike: $4.18 $0.00
Disclosure

SEC source: 0000899243-17-004102 · doc4.xml · derivative · entry 1

Booth Bruce · CIK 0001451612 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,003

Underlying: Common Stock · 12,003 shares

Expires 2027-02-13

F1 · derivative.exercise_date: The stock option was issued in lieu of cash fees under the Non-Employee Director Compensation Policy pursuant to a Non-Qualified Stock Option Agreement and shall vest over a period of one year starting January 1, 2017 on a quarterly basis in arrears.

Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.