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The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"These shares are held directly by Atlas Venture Opportunity Fund II, L.P. (\"AVOF II\"). The general partner of AVOF II is Atlas Venture Associates Opportunity II, L.P. (\"AVAO II LP\"). Atlas Venture Associates Opportunity II, LLC (\"AVAO II LLC\") is the general partner of AVAO II LP. Each of AVAO II LP and AVAO II LLC disclaims Section 16 beneficial ownership of the securities held by AVOF II, except to the extent of its pecuniary interest therein, if any."}],"balance_after":747727,"source":{"system":"sec-edgar","filing":"0000950170-25-017030","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2036042/000095017025017030/ownership.xml","form_type":"4"}},{"id":1276886,"issuer":{"id":5996,"kind":"organization","name":"Sionna Therapeutics, Inc.","symbol":"SION"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":4,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":5,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":6,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-02-10T21:05:04.000Z","date":"2025-02-10","kind":"exercise","planned":false,"acquired":true,"shares":2886293,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed convertible preferred stock, Series A convertible preferred stock, Series B convertible preferred stock and Series C convertible preferred stock (collectively, the \"Preferred Stock\") automatically converted into shares of the Issuer's Common Stock on a one-for-1.4611 basis upon the closing of the Issuer's initial public offering on February 10, 2025. The Preferred Stock had no expiration date."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are held directly by Atlas Venture Fund XI, L.P. (\"AVF XI\"). The general partner of AVF XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by AVF XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":2886293,"source":{"system":"sec-edgar","filing":"0000950170-25-017030","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2036042/000095017025017030/ownership.xml","form_type":"4"}},{"id":1612731,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-28T19:13:18.000Z","date":"2024-02-28","kind":"sale","planned":true,"acquired":false,"shares":210,"price":25.25,"value":5302.5,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Opportunity Fund II, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F12","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.25 to $25.255 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"The shares are owned directly by Atlas Venture Opportunity Fund II, L.P. (\"AVOF II\"). Atlas Venture Associates Opportunity II, L.P. (\"AVAO II LP\") is the general partner of AVOF II. Atlas Venture Associates Opportunity II, LLC (\"AVAO II LLC\") is the general partner of AVAO II LP. 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These shares were sold in multiple transactions at prices ranging from $24.25 to $25.235 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"The shares are owned directly by Atlas Venture Opportunity Fund II, L.P. (\"AVOF II\"). Atlas Venture Associates Opportunity II, L.P. (\"AVAO II LP\") is the general partner of AVOF II. Atlas Venture Associates Opportunity II, LLC (\"AVAO II LLC\") is the general partner of AVAO II LP. Each of AVAO II LP and AVAO II LLC disclaims Section 16 beneficial ownership of the securities held by AVOF II, except to the extent of its pecuniary interest therein, if any."}],"balance_after":864697,"source":{"system":"sec-edgar","filing":"0001415889-24-005777","document":"form4-02292024_120212.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":17,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005777/form4-02292024_120212.xml","form_type":"4"}},{"id":1612729,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-28T19:13:18.000Z","date":"2024-02-28","kind":"sale","planned":true,"acquired":false,"shares":360,"price":25.25,"value":9090.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Opportunity Fund I, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F12","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.25 to $25.255 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"The shares are held directly by Atlas Venture Opportunity Fund I, L.P. (\"AVOF I\"). The general partner of AVOF 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. Each of AVAO I LP and AVAO I LLC disclaims Section 16 beneficial ownership of the securities held by AVOF I, except to the extent of its pecuniary interest therein, if any."}],"balance_after":1488126,"source":{"system":"sec-edgar","filing":"0001415889-24-005777","document":"form4-02292024_120212.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005777/form4-02292024_120212.xml","form_type":"4"}},{"id":1612728,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-28T19:13:18.000Z","date":"2024-02-28","kind":"sale","planned":true,"acquired":false,"shares":22567,"price":24.83,"value":560338.61,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Opportunity Fund I, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.25 to $25.235 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"The shares are held directly by Atlas Venture Opportunity Fund I, L.P. (\"AVOF I\"). The general partner of AVOF 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. 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These shares were sold in multiple transactions at prices ranging from $25.25 to $25.255 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. 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These shares were sold in multiple transactions at prices ranging from $23.62 to $24.615 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. 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These shares were sold in multiple transactions at prices ranging from $23.83 to $24.04 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"The shares are owned directly by Atlas Venture Opportunity Fund II, L.P. (\"AVOF II\"). Atlas Venture Associates Opportunity II, L.P. (\"AVAO II LP\") is the general partner of AVOF II. Atlas Venture Associates Opportunity II, LLC (\"AVAO II LLC\") is the general partner of AVAO II LP. 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These shares were sold in multiple transactions at prices ranging from $22.83 to $23.82 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (4), (9), (10), (11) and (12)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"The shares are owned directly by Atlas Venture Opportunity Fund II, L.P. (\"AVOF II\"). Atlas Venture Associates Opportunity II, L.P. (\"AVAO II LP\") is the general partner of AVOF II. Atlas Venture Associates Opportunity II, LLC (\"AVAO II LLC\") is the general partner of AVAO II LP. 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These shares were sold in multiple transactions at prices ranging from $23.83 to $24.04 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"The shares are held directly by Atlas Venture Opportunity Fund I, L.P. (\"AVOF I\"). The general partner of AVOF 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. 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These shares were sold in multiple transactions at prices ranging from $22.83 to $23.82 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (4), (9), (10), (11) and (12)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"The shares are held directly by Atlas Venture Opportunity Fund I, L.P. (\"AVOF I\"). The general partner of AVOF 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. Each of AVAO I LP and AVAO I LLC disclaims Section 16 beneficial ownership of the securities held by AVOF I, except to the extent of its pecuniary interest therein, if any."}],"balance_after":1564932,"source":{"system":"sec-edgar","filing":"0001415889-24-005777","document":"form4-02292024_120212.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005777/form4-02292024_120212.xml","form_type":"4"}},{"id":1612715,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-28T19:13:18.000Z","date":"2024-02-26","kind":"sale","planned":true,"acquired":false,"shares":64783,"price":23.98,"value":1553496.34,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.83 to $24.04 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":6151467,"source":{"system":"sec-edgar","filing":"0001415889-24-005777","document":"form4-02292024_120212.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005777/form4-02292024_120212.xml","form_type":"4"}},{"id":1612714,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-28T19:13:18.000Z","date":"2024-02-26","kind":"sale","planned":true,"acquired":false,"shares":136312,"price":23.59,"value":3215600.08,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.83 to $23.82 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (4), (9), (10), (11) and (12)."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":6216250,"source":{"system":"sec-edgar","filing":"0001415889-24-005777","document":"form4-02292024_120212.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005777/form4-02292024_120212.xml","form_type":"4"}},{"id":1622905,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-23T18:58:32.000Z","date":"2024-02-23","kind":"sale","planned":true,"acquired":false,"shares":13738,"price":22.7,"value":311852.6,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F9","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Opportunity Fund II, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.205 to $22.92 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"The shares are owned directly by Atlas Venture Opportunity Fund II, L.P. (\"AVOF II\"). Atlas Venture Associates Opportunity II, L.P. (\"AVAO II LP\") is the general partner of AVOF II. Atlas Venture Associates Opportunity II, LLC (\"AVAO II LLC\") is the general partner of AVAO II LP. Each of AVAO II LP and AVAO II LLC disclaims Section 16 beneficial ownership of the securities held by AVOF II, except to the extent of its pecuniary interest therein, if any."}],"balance_after":920843,"source":{"system":"sec-edgar","filing":"0001415889-24-005124","document":"form4-02232024_110219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005124/form4-02232024_110219.xml","form_type":"4"}},{"id":1622904,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-23T18:58:32.000Z","date":"2024-02-23","kind":"sale","planned":true,"acquired":false,"shares":23648,"price":22.7,"value":536809.6,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Opportunity Fund I, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.205 to $22.92 inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"The shares are held directly by Atlas Venture Opportunity Fund I, L.P. (\"AVOF I\"). The general partner of AVOF 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. Each of AVAO I LP and AVAO I LLC disclaims Section 16 beneficial ownership of the securities held by AVOF I, except to the extent of its pecuniary interest therein, if any."}],"balance_after":1585137,"source":{"system":"sec-edgar","filing":"0001415889-24-005124","document":"form4-02232024_110219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005124/form4-02232024_110219.xml","form_type":"4"}},{"id":1622903,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-23T18:58:32.000Z","date":"2024-02-23","kind":"sale","planned":true,"acquired":false,"shares":159542,"price":22.7,"value":3621603.4,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.205 to $22.92 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":6352562,"source":{"system":"sec-edgar","filing":"0001415889-24-005124","document":"form4-02232024_110219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005124/form4-02232024_110219.xml","form_type":"4"}},{"id":1622902,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-23T18:58:32.000Z","date":"2024-02-22","kind":"sale","planned":true,"acquired":false,"shares":119360,"price":22.66,"value":2704697.6,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.17 to $23.1566 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":6512104,"source":{"system":"sec-edgar","filing":"0001415889-24-005124","document":"form4-02232024_110219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005124/form4-02232024_110219.xml","form_type":"4"}},{"id":1622901,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-23T18:58:32.000Z","date":"2024-02-21","kind":"sale","planned":true,"acquired":false,"shares":35164,"price":23.14,"value":813694.96,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.7625 to $23.3899 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":6631464,"source":{"system":"sec-edgar","filing":"0001415889-24-005124","document":"form4-02232024_110219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005124/form4-02232024_110219.xml","form_type":"4"}},{"id":1622900,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83426,"kind":"organization","name":"Atlas Venture Opportunity Fund II, L.P.","position":7,"cik":"0001885327","reported_name":"Atlas Venture Opportunity Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83427,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LP","position":8,"cik":"0001935814","reported_name":"Atlas Venture Associates Opportunity II, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83428,"kind":"organization","name":"Atlas Venture Associates Opportunity II, LLC","position":9,"cik":"0001935810","reported_name":"Atlas Venture Associates Opportunity II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-23T18:58:32.000Z","date":"2024-02-21","kind":"sale","planned":true,"acquired":false,"shares":149337,"price":22.44,"value":3351122.28,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.75 to $22.72 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (4), (5) and (6)."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":6666628,"source":{"system":"sec-edgar","filing":"0001415889-24-005124","document":"form4-02232024_110219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1935810/000141588924005124/form4-02232024_110219.xml","form_type":"4"}},{"id":1634094,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-20T23:35:34.000Z","date":"2024-02-20","kind":"sale","planned":true,"acquired":false,"shares":3510,"price":23.4,"value":82134.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.16 to $24.01 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":6815965,"source":{"system":"sec-edgar","filing":"0001415889-24-004467","document":"form4-02202024_110225.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1818794/000141588924004467/form4-02202024_110225.xml","form_type":"4"}},{"id":1634093,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-20T23:35:34.000Z","date":"2024-02-20","kind":"sale","planned":true,"acquired":false,"shares":166029,"price":22.71,"value":3770518.59,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.117 to $23.09 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":6819475,"source":{"system":"sec-edgar","filing":"0001415889-24-004467","document":"form4-02202024_110225.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1818794/000141588924004467/form4-02202024_110225.xml","form_type":"4"}},{"id":1634092,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-20T23:35:34.000Z","date":"2024-02-16","kind":"sale","planned":true,"acquired":false,"shares":162707,"price":23.14,"value":3765039.98,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.878 to $23.54 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":6985504,"source":{"system":"sec-edgar","filing":"0001415889-24-004467","document":"form4-02202024_110225.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1818794/000141588924004467/form4-02202024_110225.xml","form_type":"4"}},{"id":1634091,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-20T23:35:34.000Z","date":"2024-02-15","kind":"sale","planned":true,"acquired":false,"shares":2113,"price":24.45,"value":51662.85,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.40 to $24.51 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":7148211,"source":{"system":"sec-edgar","filing":"0001415889-24-004467","document":"form4-02202024_110225.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818794/000141588924004467/form4-02202024_110225.xml","form_type":"4"}},{"id":1634090,"issuer":{"id":3948,"kind":"organization","name":"Dyne Therapeutics, Inc.","symbol":"DYN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-02-20T23:35:34.000Z","date":"2024-02-15","kind":"sale","planned":true,"acquired":false,"shares":175793,"price":23.88,"value":4197936.84,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Atlas Venture Fund XI, L.P. on January 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.40 to $24.3943 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (4), (5), (6) and (7)."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. 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(\"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. 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These shares were sold in multiple transactions at prices ranging from $0.85 to $0.9499 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. 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(\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":1241935,"source":{"system":"sec-edgar","filing":"0001209191-21-069644","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1780068/000120919121069644/doc4.xml","form_type":"4"}},{"id":2473587,"issuer":{"id":7139,"kind":"organization","name":"ImageneBio, Inc."},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2021-12-15T01:27:43.000Z","date":"2021-12-13","kind":"sale","acquired":false,"shares":8330,"price":14.64,"value":121951.2,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.60 to $14.65 inclusive."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":1247894,"source":{"system":"sec-edgar","filing":"0001209191-21-069644","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1780068/000120919121069644/doc4.xml","form_type":"4"}},{"id":2473586,"issuer":{"id":7139,"kind":"organization","name":"ImageneBio, Inc."},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2021-12-15T01:27:43.000Z","date":"2021-12-10","kind":"sale","acquired":false,"shares":11989,"price":15.03,"value":180194.67,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.60 to $15.55 inclusive. The Reporting Persons undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (4)."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Atlas Venture Fund XI\"). The general partner of Atlas Venture Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":1256224,"source":{"system":"sec-edgar","filing":"0001209191-21-069644","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1780068/000120919121069644/doc4.xml","form_type":"4"}},{"id":2473585,"issuer":{"id":7139,"kind":"organization","name":"ImageneBio, Inc."},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":2,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":3,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":4,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":5,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":6,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2021-12-15T01:27:43.000Z","date":"2021-03-30","kind":"purchase","acquired":true,"shares":125000,"price":16,"value":2000000.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"The shares are held directly by Atlas Venture Opportunity Fund I, L.P. (\"Atlas Venture Opportunity Fund I\"). The general partner of Atlas Venture\nOpportunity Fund I is Atlas Venture Associates Opportunity I, L.P. (\"AVAO I LP\"). Atlas Venture Associates Opportunity I, LLC (\"AVAO I LLC\") is\nthe general partner of AVAO I LP. Each of AVAO I LP and AVAO I LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Opportunity Fund I, except to the extent of its pecuniary interest therein, if any."}],"balance_after":874634,"source":{"system":"sec-edgar","filing":"0001209191-21-069644","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1780068/000120919121069644/doc4.xml","form_type":"4"}},{"id":2686813,"issuer":{"id":51180,"kind":"organization","name":"Day One Biopharmaceuticals, Inc.","symbol":"DAWN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":2,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":3,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":4,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":5,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":6,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B Preferred Stock","published_at":"2021-06-02T22:40:34.000Z","date":"2021-06-01","kind":"exercise","acquired":false,"shares":741396,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The shares of the Issuer's Series B Preferred Stock automatically converted on a one-for-one basis into shares of the Issuer's Common Stock on May 26, 2021 in connection with the closing of the Issuer's sale of its Common Stock in its IPO pursuant to the Registration Statement, and had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The shares of the Issuer's Series B Preferred Stock automatically converted on a one-for-one basis into shares of the Issuer's Common Stock on May 26, 2021 in connection with the closing of the Issuer's sale of its Common Stock in its IPO pursuant to the Registration Statement, and had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The shares of the Issuer's Series B Preferred Stock automatically converted on a one-for-one basis into shares of the Issuer's Common Stock on May 26, 2021 in connection with the closing of the Issuer's sale of its Common Stock in its IPO pursuant to the Registration Statement, and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"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. Each of AVAO I LP and AVAO I LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Opportunity Fund I, except to the extent of its pecuniary interest therein, if any."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":741396},"source":{"system":"sec-edgar","filing":"0001209191-21-037402","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1780068/000120919121037402/doc4.xml","form_type":"4"}},{"id":2686812,"issuer":{"id":51180,"kind":"organization","name":"Day One Biopharmaceuticals, Inc.","symbol":"DAWN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":2,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":3,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":4,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":5,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":6,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A Preferred Stock","published_at":"2021-06-02T22:40:34.000Z","date":"2021-06-01","kind":"exercise","acquired":false,"shares":7761380,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The shares of the Issuer's Series A Preferred Stock automatically converted on a one-for-one basis into shares of the Issuer's Common Stock on May 26, 2021 in connection with the closing of the Issuer's sale of its Common Stock in its firm commitment initial public offering (the \"IPO\") pursuant to a registration statement on Form S-1 (File No. 333-255754) under the Securities Act of 1933, as amended (the \"Registration Statement\"), and had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares of the Issuer's Series A Preferred Stock automatically converted on a one-for-one basis into shares of the Issuer's Common Stock on May 26, 2021 in connection with the closing of the Issuer's sale of its Common Stock in its firm commitment initial public offering (the \"IPO\") pursuant to a registration statement on Form S-1 (File No. 333-255754) under the Securities Act of 1933, as amended (the \"Registration Statement\"), and had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The shares of the Issuer's Series A Preferred Stock automatically converted on a one-for-one basis into shares of the Issuer's Common Stock on May 26, 2021 in connection with the closing of the Issuer's sale of its Common Stock in its firm commitment initial public offering (the \"IPO\") pursuant to a registration statement on Form S-1 (File No. 333-255754) under the Securities Act of 1933, as amended (the \"Registration Statement\"), and had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The shares are held directly by Atlas Venture Fund XI, L.P. (\"Fund XI\"). The general partner of Fund XI is Atlas Venture Associates XI, L.P. (\"AVA XI LP\"). Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVA XI LP. Each of AVA XI LP and AVA XI LLC disclaims Section 16 beneficial ownership of the securities held by Fund XI, except to the extent of its pecuniary interest therein, if any."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":7761380},"source":{"system":"sec-edgar","filing":"0001209191-21-037402","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1780068/000120919121037402/doc4.xml","form_type":"4"}},{"id":2686811,"issuer":{"id":51180,"kind":"organization","name":"Day One Biopharmaceuticals, Inc.","symbol":"DAWN"},"owners":[{"id":83423,"kind":"organization","name":"Atlas Venture Fund XI, L.P.","position":1,"cik":"0001708269","reported_name":"Atlas Venture Fund XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67262,"kind":"organization","name":"Atlas Venture Associates Opportunity I, LLC","position":2,"cik":"0001780066","reported_name":"Atlas Venture Associates Opportunity I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67260,"kind":"organization","name":"Atlas Venture Opportunity Fund I, L.P.","position":3,"cik":"0001759241","reported_name":"Atlas Venture Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":67261,"kind":"organization","name":"Atlas Venture Associates Opportunity I, L.P.","position":4,"cik":"0001780065","reported_name":"Atlas Venture Associates Opportunity I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83424,"kind":"organization","name":"Atlas Venture Associates XI, L.P.","position":5,"cik":"0001780068","reported_name":"Atlas Venture Associates XI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":83425,"kind":"organization","name":"Atlas Venture Associates XI, LLC","position":6,"cik":"0001780067","reported_name":"Atlas Venture Associates XI, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B Preferred Stock","published_at":"2021-06-02T22:40:34.000Z","date":"2021-02-01","kind":"purchase","acquired":true,"shares":741396,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F7","text":"The Reporting Person is reporting the purchase of these securities pursuant to Rule 16a-2(a) of the Securities Exchange Act of 1934, as amended. Each share of Series B Preferred Stock automatically converted into one share of Common Stock at the close of the Issuer's IPO and has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The Reporting Person is reporting the purchase of these securities pursuant to Rule 16a-2(a) of the Securities Exchange Act of 1934, as amended. Each share of Series B Preferred Stock automatically converted into one share of Common Stock at the close of the Issuer's IPO and has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"The Reporting Person is reporting the purchase of these securities pursuant to Rule 16a-2(a) of the Securities Exchange Act of 1934, as amended. Each share of Series B Preferred Stock automatically converted into one share of Common Stock at the close of the Issuer's IPO and has no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"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. 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(\"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. 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The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"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. 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Atlas Venture Associates Opportunity I, L.P. (\"AVAO LP\") is the general partner of AVO I. Atlas Venture Associates Opportunity I, LLC (\"AVAO LLC\") is the general partner of AVAO LP. 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Atlas Venture Associates XI, L.P., (\"AVA XI LP\") is the general partner of AVF XI.  Atlas Venture Associates XI, LLC (\"AVA XI LLC\") is the general partner of AVF XI LP.  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Atlas Venture Associates Opportunity I, L.P. (\"AVAO LP\") is the general partner of AVO I. Atlas Venture Associates Opportunity I, LLC (\"AVAO LLC\") is the general partner of AVAO LP. 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