{"transactions":[{"id":1496657,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-05-31T21:24:23.000Z","date":"2024-05-29","kind":"other","planned":false,"acquired":false,"shares":98533,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F8","text":"Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by PVM to its members."},{"field":"shares","element":"transactionShares","label":"F6","text":"Shares held by PVM. 276 shares received from PVPFF VI, 78,869 shares received from PVP VI AIV and 19,388 shares received from PVP VI AIV-B. The Managing Members are managing members of PVM and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F7","text":"(Continued from footnote 6) Each of the Managing Members disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000950170-24-067444","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000095017024067444/ownership.xml","form_type":"4"}},{"id":1496656,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-05-31T21:24:23.000Z","date":"2024-05-29","kind":"other","planned":false,"acquired":true,"shares":98533,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"Represents a change in the form of ownership of PVM by virtue of the receipt of shares in the pro-rata in-kind distribution of common stock of the Issuer for no consideration by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F6","text":"Shares held by PVM. 276 shares received from PVPFF VI, 78,869 shares received from PVP VI AIV and 19,388 shares received from PVP VI AIV-B. The Managing Members are managing members of PVM and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F7","text":"(Continued from footnote 6) Each of the Managing Members disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":98533,"source":{"system":"sec-edgar","filing":"0000950170-24-067444","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000095017024067444/ownership.xml","form_type":"4"}},{"id":1496655,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-05-31T21:24:23.000Z","date":"2024-05-29","kind":"other","planned":false,"acquired":false,"shares":500000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by Polaris Venture Partners Founders' Fund VI, L.P. (\"PVPFF VI\"), Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and Polaris Venture Partners VI (AIV-B), L.P. (p/k/a PVP VI (AIV) Feeder Corp. Holding Partnership, L.P., \"PVP VI AIV-B\" and, together with PVPFF VI, PVP VI AIV and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\")."},{"field":"shares","element":"transactionShares","label":"F2","text":"27,606 shares were distributed by PVPFF VI, 379,180 shares were distributed by PVP VI AIV and 93,214 shares were distributed by PVP VI AIV-B. The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\"). Each of Amir Nashat, Brian Chee, David Barrett, Bryce Youngren, Jonathan Flint, and Terrance McGuire are managing members of PVM (collectively, the \"Managing Members\") and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F3","text":"(Continued from footnote 2) Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"544,039 shares are held by PVPFF VI, 7,072,644 shares are held by PVP VI AIV, 1,738,666 shares are held by PVP VI AIV-B and 498,468 shares are held by PVP VI. Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":9853817,"source":{"system":"sec-edgar","filing":"0000950170-24-067444","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000095017024067444/ownership.xml","form_type":"4"}},{"id":1530527,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-05-02T21:32:41.000Z","date":"2024-04-30","kind":"other","planned":false,"acquired":false,"shares":98533,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F8","text":"Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by PVM to its members."},{"field":"shares","element":"transactionShares","label":"F6","text":"Shares held by PVM. 276 shares received from PVPFF VI, 78,869 shares received from PVP VI AIV and 19,388 shares received from PVP VI AIV-B. The Managing Members are managing members of PVM and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F7","text":"(Continued from footnote 6) Each of the Managing Members disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000950170-24-052329","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000095017024052329/ownership.xml","form_type":"4"}},{"id":1530526,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. 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The Managing Members are managing members of PVM and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F7","text":"(Continued from footnote 6) Each of the Managing Members disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":98533,"source":{"system":"sec-edgar","filing":"0000950170-24-052329","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000095017024052329/ownership.xml","form_type":"4"}},{"id":1530525,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2024-05-02T21:32:41.000Z","date":"2024-04-30","kind":"other","planned":false,"acquired":false,"shares":500000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by Polaris Venture Partners Founders' Fund VI, L.P. (\"PVPFF VI\"), Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and Polaris Venture Partners VI (AIV-B), L.P. (p/k/a PVP VI (AIV) Feeder Corp. Holding Partnership, L.P., \"PVP VI AIV-B\" and, together with PVPFF VI, PVP VI AIV and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\")."},{"field":"shares","element":"transactionShares","label":"F2","text":"27,606 shares were distributed by PVPFF VI, 379,180 shares were distributed by PVP VI AIV and 93,214 shares were distributed by PVP VI AIV-B. The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\"). Each of Amir Nashat, Brian Chee, David Barrett, Bryce Youngren, Jonathan Flint, and Terrance McGuire are managing members of PVM (collectively, the \"Managing Members\") and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F3","text":"(Continued from footnote 2) Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"571,645 shares are held by PVPFF VI, 7,451,824 shares are held by PVP VI AIV, 1,831,880 shares are held by PVP VI AIV-B and 498,468 shares are held by PVP VI. Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":10353817,"source":{"system":"sec-edgar","filing":"0000950170-24-052329","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000095017024052329/ownership.xml","form_type":"4"}},{"id":1782030,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-09-13T20:33:40.000Z","date":"2023-09-11","kind":"sale","planned":false,"acquired":false,"shares":500000,"price":6,"value":3000000.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"27,606 shares were sold by Polaris Venture Partners Founders' Fund VI, L.P. (\"PVPFF VI\"), 379,180 shares were sold by Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and 93,214 shares were sold by Polaris Venture Partners VI (AIV-B), L.P. (p/k/a PVP VI (AIV) Feeder Corp. Holding Partnership, L.P., \"PVP VI AIV-B\" and, together with PVPFF VI, PVP VI AIV and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\")."},{"field":"shares","element":"transactionShares","label":"F2","text":"(Continued from footnote 1) The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\"). Each of Amir Nashat, Brian Chee, David Barrett, Bryce Youngren, Jonathan Flint, and Terrance McGuire, a member of the Issuer's board of directors, are managing members of PVM (collectively, the \"Managing Members\") and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds. Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"599,251 shares are held by PVPFF VI, 7,831,004 shares are held by PVP VI AIV, 1,925,094 shares are held by PVP VI AIV-B and 498,468 shares are held by PVP VI. Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":10853817,"source":{"system":"sec-edgar","filing":"0000899243-23-018840","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924323018840/doc4.xml","form_type":"4"}},{"id":1797662,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-08-24T21:26:24.000Z","date":"2023-08-22","kind":"other","planned":false,"acquired":false,"shares":98533,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F8","text":"Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by PVM to its members."},{"field":"shares","element":"transactionShares","label":"F6","text":"Shares held by PVM. 276 shares received from PVPFF VI, 78,869 shares received from PVP VI AIV and 19,388 shares received from PVP VI AIV-B. The Managing Members, including Terrance McGuire who is a member of the Issuer's board of directors, are managing members of PVM and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F7","text":"(Continued from footnote 6) Each of the Managing Members disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-23-018377","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924323018377/doc4.xml","form_type":"4"}},{"id":1797661,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-08-24T21:26:24.000Z","date":"2023-08-22","kind":"other","planned":false,"acquired":true,"shares":98533,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"Represents a change in the form of ownership of PVM by virtue of the receipt of shares in the pro-rata in-kind distribution of common stock of the Issuer for no consideration by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F6","text":"Shares held by PVM. 276 shares received from PVPFF VI, 78,869 shares received from PVP VI AIV and 19,388 shares received from PVP VI AIV-B. The Managing Members, including Terrance McGuire who is a member of the Issuer's board of directors, are managing members of PVM and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F7","text":"(Continued from footnote 6) Each of the Managing Members disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":98533,"source":{"system":"sec-edgar","filing":"0000899243-23-018377","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924323018377/doc4.xml","form_type":"4"}},{"id":1797660,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2023-08-24T21:26:24.000Z","date":"2023-08-22","kind":"other","planned":false,"acquired":false,"shares":500000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by Polaris Venture Partners Founders' Fund VI, L.P. (\"PVPFF VI\"), Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and Polaris Venture Partners VI (AIV-B), L.P. (p/k/a PVP VI (AIV) Feeder Corp. Holding Partnership, L.P., \"PVP VI AIV-B\" and, together with PVPFF VI, PVP VI AIV and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\")."},{"field":"shares","element":"transactionShares","label":"F2","text":"27,606 shares were distributed by PVPFF VI, 379,180 shares were distributed by PVP VI AIV and 93,214 shares were distributed by PVP VI AIV-B. The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\"). Each of Amir Nashat, Brian Chee, David Barrett, Bryce Youngren, Jonathan Flint, and Terrance McGuire, a member of the Issuer's board of directors, are managing members of PVM (collectively, the \"Managing Members\") and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F3","text":"(Continued from footnote 2) Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"626,857 shares are held by PVPFF VI, 8,210,184 shares are held by PVP VI AIV, 2,018,308 shares are held by PVP VI AIV-B and 498,468 shares are held by PVP VI. Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":11353817,"source":{"system":"sec-edgar","filing":"0000899243-23-018377","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924323018377/doc4.xml","form_type":"4"}},{"id":2110229,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2022-11-18T22:17:51.000Z","date":"2022-11-16","kind":"other","acquired":false,"shares":98533,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F8","text":"Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by PVM to its members."},{"field":"shares","element":"transactionShares","label":"F6","text":"Shares held by PVM. 276 shares received from PVPFF VI, 78,869 shares received from PVP VI AIV and 19,388 shares received from PVP VI AIV-B. The Managing Members, including Terrance McGuire who is a member of the Issuer's board of directors, are managing members of PVM and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F7","text":"(Continued from footnote 6) Each of the Managing Members disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-22-036406","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924322036406/doc4.xml","form_type":"4"}},{"id":2110228,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2022-11-18T22:17:51.000Z","date":"2022-11-16","kind":"other","acquired":true,"shares":98533,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"Represents a change in the form of ownership of PVM by virtue of the receipt of shares in the pro-rata in-kind distribution of common stock of the Issuer for no consideration by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F6","text":"Shares held by PVM. 276 shares received from PVPFF VI, 78,869 shares received from PVP VI AIV and 19,388 shares received from PVP VI AIV-B. The Managing Members, including Terrance McGuire who is a member of the Issuer's board of directors, are managing members of PVM and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F7","text":"(Continued from footnote 6) Each of the Managing Members disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":98533,"source":{"system":"sec-edgar","filing":"0000899243-22-036406","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924322036406/doc4.xml","form_type":"4"}},{"id":2110227,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"Polaris Venture Partners VI (AIV-B), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2022-11-18T22:17:51.000Z","date":"2022-11-16","kind":"other","acquired":false,"shares":500000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by Polaris Venture Partners Founders' Fund VI, L.P. (\"PVPFF VI\"), Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and Polaris Venture Partners VI (AIV-B), L.P. (p/k/a PVP VI (AIV) Feeder Corp. Holding Partnership, L.P., \"PVP VI AIV-B\" and, together with PVPFF VI, PVP VI AIV and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\")."},{"field":"shares","element":"transactionShares","label":"F2","text":"27,606 shares were distributed by PVPFF VI, 379,180 shares were distributed by PVP VI AIV and 93,214 shares were distributed by PVP VI AIV-B. The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\"). Each of Amir Nashat, Brian Chee, David Barrett, Bryce Youngren, Jonathan Flint, and Terrance McGuire, a member of the Issuer's board of directors, are managing members of PVM (collectively, the \"Managing Members\") and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F3","text":"(Continued from footnote 2) Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"654,463 shares are held by PVPFF VI, 8,589,364 shares are held by PVP VI AIV, 2,111,522 shares are held by PVP VI AIV-B and 498,468 shares are held by PVP VI. Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":11853817,"source":{"system":"sec-edgar","filing":"0000899243-22-036406","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924322036406/doc4.xml","form_type":"4"}},{"id":2459565,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2021-12-23T21:44:37.000Z","date":"2021-12-21","kind":"other","acquired":false,"shares":98533,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F8","text":"Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by PVM to its members."},{"field":"shares","element":"transactionShares","label":"F6","text":"Shares held by PVM. 276 shares received from PVPFF VI, 78,869 shares received from PVP VI AIV and 19,388 shares received from PVP VI AIV-B. The Managing Members, including Terrance McGuire who is a member of the Issuer's board of directors, are managing members of PVM and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F7","text":"(Continued from footnote 6) Each of the Managing Members disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-21-049599","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924321049599/doc4.xml","form_type":"4"}},{"id":2459564,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2021-12-23T21:44:37.000Z","date":"2021-12-21","kind":"other","acquired":true,"shares":98533,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"Represents a change in the form of ownership of PVM by virtue of the receipt of shares in the pro-rata in-kind distribution of common stock of the Issuer for no consideration by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F6","text":"Shares held by PVM. 276 shares received from PVPFF VI, 78,869 shares received from PVP VI AIV and 19,388 shares received from PVP VI AIV-B. The Managing Members, including Terrance McGuire who is a member of the Issuer's board of directors, are managing members of PVM and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F7","text":"(Continued from footnote 6) Each of the Managing Members disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":98533,"source":{"system":"sec-edgar","filing":"0000899243-21-049599","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924321049599/doc4.xml","form_type":"4"}},{"id":2459563,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2021-12-23T21:44:37.000Z","date":"2021-12-21","kind":"other","acquired":false,"shares":500000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by Polaris Venture Partners Founders' Fund VI, L.P. (\"PVPFF VI\"), Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and Polaris Venture Partners VI (AIV-B), L.P. (f/k/a PVP VI (AIV) Feeder Corp. Holding Partnership, L.P., \"PVP VI AIV-B\" and, together with PVPFF VI, PVP VI AIV and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\")."},{"field":"shares","element":"transactionShares","label":"F2","text":"27,606 shares were distributed by PVPFF VI, 379,180 shares were distributed by PVP VI AIV and 93,214 shares were distributed by PVP VI AIV-B. The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\"). Each of Amir Nashat, Brian Chee, David Barrett, Bryce Youngren, Jonathan Flint, and Terrance McGuire, a member of the Issuer's board of directors, are managing members of PVM (collectively, the \"Managing Members\") and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F3","text":"(Continued from footnote 2) Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"682,069 shares are held by PVPFF VI, 8,968,544 shares are held by PVP VI AIV, 2,204,736 shares are held by PVP VI AIV-B and 498,468 shares are held by PVP VI. Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":12353817,"source":{"system":"sec-edgar","filing":"0000899243-21-049599","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924321049599/doc4.xml","form_type":"4"}},{"id":3099741,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-06-25T21:47:35.000Z","date":"2020-06-23","kind":"sale","acquired":false,"shares":4377,"price":31.5428,"value":138062.8356,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"242 shares were sold by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\"), 3,153 shares were sold by Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and 982 shares were sold by PVP VI (AIV) Feeder Corp. Holding Partnership, L.P. (\"PVP VI Feeder\" and, together with PVP VI AIV, PVPFF VI, and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\"). The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\"). Each of Amir Nashat, Brian Chee, David Barrett, Bryce Youngren, Jonathan Flint, and Terrance McGuire, a member of the Issuer's board of directors, are managing members of PVM (collectively, the \"Managing Members\") and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds."},{"field":"shares","element":"transactionShares","label":"F2","text":"(Continued from footnote 1) Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.50 to $31.61, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (3) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"709,675 shares are held by PVPFF VI, 9,347,724 shares are held by PVP VI AIV, 2,297,950 shares are held by PVP VI Feeder and 498,468 shares are held by PVP VI. Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein."}],"balance_after":12853817,"source":{"system":"sec-edgar","filing":"0000899243-20-017680","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924320017680/doc4.xml","form_type":"4"}},{"id":3660405,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series E Preferred Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":false,"shares":527597,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"29,129 shares are held by PVPFF VI and 498,468 shares are held by PVP VI. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":527597},"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660404,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series D Preferred Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":false,"shares":1246883,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"68,842 shares are held by PVPFF VI, 945,571 shares are held by PVP VI AIV and 232,470 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1246883},"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660403,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series C Preferred Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":false,"shares":2808989,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"155,087 shares are held by PVPFF VI, 2,130,190 shares are held by PVP VI AIV and 523,712 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":2808989},"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660402,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B Preferred Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":false,"shares":2500000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"138,030 shares are held by PVPFF VI, 1,895,867 shares are held by PVP VI AIV and 466,103 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":2500000},"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660401,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-2 Preferred Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":false,"shares":5274725,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"291,223 shares are held by PVPFF VI, 4,000,075 shares are held by PVP VI AIV and 983,427 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":5274725},"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660400,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-1 Preferred Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":false,"shares":500000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"27,606 shares are held by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\"), 379,174 shares are held by Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and 93,220 shares are held by PVP VI (AIV) Feeder Corp. Holding Partnership, L.P. (\"PVP VI Feeder\" and, together with PVP VI AIV, PVPFF VI, and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\"). The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\").  PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":500000},"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660399,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":true,"shares":527597,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"27,606 shares are held by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\"), 379,174 shares are held by Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and 93,220 shares are held by PVP VI (AIV) Feeder Corp. Holding Partnership, L.P. (\"PVP VI Feeder\" and, together with PVP VI AIV, PVPFF VI, and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\"). The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\").  PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"291,223 shares are held by PVPFF VI, 4,000,075 shares are held by PVP VI AIV and 983,427 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"138,030 shares are held by PVPFF VI, 1,895,867 shares are held by PVP VI AIV and 466,103 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"155,087 shares are held by PVPFF VI, 2,130,190 shares are held by PVP VI AIV and 523,712 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"68,842 shares are held by PVPFF VI, 945,571 shares are held by PVP VI AIV and 232,470 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"29,129 shares are held by PVPFF VI and 498,468 shares are held by PVP VI. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":12858194,"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660398,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":true,"shares":1246883,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"27,606 shares are held by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\"), 379,174 shares are held by Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and 93,220 shares are held by PVP VI (AIV) Feeder Corp. Holding Partnership, L.P. (\"PVP VI Feeder\" and, together with PVP VI AIV, PVPFF VI, and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\"). The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\").  PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"291,223 shares are held by PVPFF VI, 4,000,075 shares are held by PVP VI AIV and 983,427 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"138,030 shares are held by PVPFF VI, 1,895,867 shares are held by PVP VI AIV and 466,103 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"155,087 shares are held by PVPFF VI, 2,130,190 shares are held by PVP VI AIV and 523,712 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"68,842 shares are held by PVPFF VI, 945,571 shares are held by PVP VI AIV and 232,470 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":12330597,"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660397,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":true,"shares":2808989,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"27,606 shares are held by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\"), 379,174 shares are held by Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and 93,220 shares are held by PVP VI (AIV) Feeder Corp. Holding Partnership, L.P. (\"PVP VI Feeder\" and, together with PVP VI AIV, PVPFF VI, and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\"). The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\").  PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"291,223 shares are held by PVPFF VI, 4,000,075 shares are held by PVP VI AIV and 983,427 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"138,030 shares are held by PVPFF VI, 1,895,867 shares are held by PVP VI AIV and 466,103 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"155,087 shares are held by PVPFF VI, 2,130,190 shares are held by PVP VI AIV and 523,712 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":11083714,"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660396,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":true,"shares":2500000,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"27,606 shares are held by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\"), 379,174 shares are held by Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and 93,220 shares are held by PVP VI (AIV) Feeder Corp. Holding Partnership, L.P. (\"PVP VI Feeder\" and, together with PVP VI AIV, PVPFF VI, and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\"). The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\").  PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"291,223 shares are held by PVPFF VI, 4,000,075 shares are held by PVP VI AIV and 983,427 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"138,030 shares are held by PVPFF VI, 1,895,867 shares are held by PVP VI AIV and 466,103 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":8274725,"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660395,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":true,"shares":5274725,"ownership":{"direct":false,"nature":"See footnotes"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"27,606 shares are held by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\"), 379,174 shares are held by Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and 93,220 shares are held by PVP VI (AIV) Feeder Corp. Holding Partnership, L.P. (\"PVP VI Feeder\" and, together with PVP VI AIV, PVPFF VI, and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\"). The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\").  PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"291,223 shares are held by PVPFF VI, 4,000,075 shares are held by PVP VI AIV and 983,427 shares are held by PVP VI Feeder. PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":5774725,"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3660394,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90384,"kind":"organization","name":"Polaris Venture Partners VI (AIV), L.P.","position":2,"cik":"0001767127","reported_name":"Polaris Venture Partners VI (AIV), L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":4,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90387,"kind":"organization","name":"Polaris Venture Partners VI (AIV-B), L.P.","position":5,"cik":"0001767130","reported_name":"PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-02-13T22:33:37.000Z","date":"2019-02-11","kind":"exercise","acquired":true,"shares":500000,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each of the Series A-1 Preferred Stock, Series A-2 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"27,606 shares are held by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\"), 379,174 shares are held by Polaris Venture Partners VI (AIV), L.P. (\"PVP VI AIV\") and 93,220 shares are held by PVP VI (AIV) Feeder Corp. Holding Partnership, L.P. (\"PVP VI Feeder\" and, together with PVP VI AIV, PVPFF VI, and Polaris Venture Partners VI, L.P. (\"PVP VI\"), the \"Polaris Funds\"). The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (\"PVM\").  PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that PVM is the beneficial owner of such securities, except to the extent of its pecuniary interest therein, if any."}],"balance_after":500000,"source":{"system":"sec-edgar","filing":"0001209191-19-009780","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000120919119009780/doc4.xml","form_type":"4"}},{"id":3912682,"issuer":{"id":3721,"kind":"organization","name":"Scholar Rock Holding Corp","symbol":"SRRK"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. 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(\"PVPFF VI\"). PVM VI is the general partner of PVPFF VI. PVM VI may be deemed to have sole voting and dispositive power with respect to the shares held by PVPFF VI and the Managing Members may each be deemed to have shared voting and dispositive power with respect to the shares held by PVPFF VI. Each of PVM VI and the Managing Members disclaims beneficial ownership of these securities and this report shall not be deemed an admission that PVM VI or any of the Managing Members is a beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":16542},"source":{"system":"sec-edgar","filing":"0001104659-18-037319","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":26,"url":"https://www.sec.gov/Archives/edgar/data/1727196/000110465918037319/a4.xml","form_type":"4"}},{"id":3912681,"issuer":{"id":3721,"kind":"organization","name":"Scholar Rock Holding Corp","symbol":"SRRK"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. 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(\"PVP VI\"). Polaris Venture Management Co. VI, L.L.C. (\"PVM VI\") is the general partner of PVP VI. PVM VI is managed by its managing members, one of whom is Dr. Amir Nashat, a member of the Issuer's Board of Directors (collectively, the \"Managing Members\"). 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Each of PVM VI and the Managing Members disclaims beneficial ownership of these securities and this report shall not be deemed an admission that PVM VI or any of the Managing Members is a beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":40514},"source":{"system":"sec-edgar","filing":"0001104659-18-037319","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":24,"url":"https://www.sec.gov/Archives/edgar/data/1727196/000110465918037319/a4.xml","form_type":"4"}},{"id":3912679,"issuer":{"id":3721,"kind":"organization","name":"Scholar Rock Holding Corp","symbol":"SRRK"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. 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(\"PVP VI\"). Polaris Venture Management Co. VI, L.L.C. (\"PVM VI\") is the general partner of PVP VI. PVM VI is managed by its managing members, one of whom is Dr. Amir Nashat, a member of the Issuer's Board of Directors (collectively, the \"Managing Members\"). 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VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":2,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-12-08T22:07:05.000Z","date":"2016-12-07","kind":"sale","acquired":false,"shares":75000,"price":15.82,"value":1186500.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 70,859 shares disposed of by Polaris Venture Partners VI, L.P. (\"PVP VI\") and 4,141 shares disposed of by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\")."},{"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 $15.70 to $15.93, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"3,587,503 of these shares are owned directly by PVP VI and 209,641 of the shares are owned by PVPFF VI (together with PVP VI, the \"Polaris Funds\"). Polaris Venture Management Co. VI, L.L.C. (\"Polaris Management\") is the general partner of each of the Polaris Funds. Kevin Bitterman, a member of the Board of Directors of the Issuer, has an assignee interest in Polaris Management. Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein."}],"balance_after":3797144,"source":{"system":"sec-edgar","filing":"0000899243-16-035126","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924316035126/doc4.xml","form_type":"4"}},{"id":4529932,"issuer":{"id":5502,"kind":"organization","name":"Editas Medicine, Inc.","symbol":"EDIT"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":2,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-12-07T21:44:58.000Z","date":"2016-12-06","kind":"sale","acquired":false,"shares":50000,"price":15.87,"value":793500.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents 47,240 shares disposed of by PVP VI and 2,760 shares disposed of by PVPFF VI."},{"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 $15.80 to $15.94, inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"3,658,362 of these shares are owned directly by PVP VI and 213,782 of the shares are owned by PVPFF VI . Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein."}],"balance_after":3872144,"source":{"system":"sec-edgar","filing":"0000899243-16-035046","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924316035046/doc4.xml","form_type":"4"}},{"id":4529931,"issuer":{"id":5502,"kind":"organization","name":"Editas Medicine, Inc.","symbol":"EDIT"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":2,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-12-07T21:44:58.000Z","date":"2016-12-05","kind":"sale","acquired":false,"shares":80000,"price":15.74,"value":1259200.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 75,583 shares disposed of by Polaris Venture Partners VI, L.P. (\"PVP VI\") and 4,417 shares disposed of by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\")."},{"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 $15.70 to $15.96, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities 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 (5) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"3,705,602 of these shares are owned directly by PVP VI and 216,542 of the shares are owned by PVPFF VI (together with PVP VI, the \"Polaris Funds\"). Polaris Venture Management Co. VI, L.L.C. (\"Polaris Management\") is the general partner of each of the Polaris Funds. Kevin Bitterman, a member of the Board of Directors of the Issuer, has an assignee interest in Polaris Management. Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein."}],"balance_after":3922144,"source":{"system":"sec-edgar","filing":"0000899243-16-035046","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924316035046/doc4.xml","form_type":"4"}},{"id":4541071,"issuer":{"id":5502,"kind":"organization","name":"Editas Medicine, Inc.","symbol":"EDIT"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":2,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-11-28T21:37:37.000Z","date":"2016-11-23","kind":"sale","acquired":false,"shares":21480,"price":15.71,"value":337450.8,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 20,294 shares disposed of by Polaris Venture Partners VI, L.P. (\"PVP VI\") and 1,186 shares disposed of by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\")."},{"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 $15.70 to $15.84, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"3,781,185 of these shares are owned directly by PVP VI and 220,959 of the shares are owned by PVPFF VI (together with PVP VI, the \"Polaris Funds\"). Polaris Venture Management Co. VI, L.L.C. (\"Polaris Management\") is the general partner of each of the Polaris Funds. Kevin Bitterman, a member of the Board of Directors of the Issuer, has an assignee interest in Polaris Management. Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein."}],"balance_after":4002144,"source":{"system":"sec-edgar","filing":"0000899243-16-034435","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924316034435/doc4.xml","form_type":"4"}},{"id":4543083,"issuer":{"id":5502,"kind":"organization","name":"Editas Medicine, Inc.","symbol":"EDIT"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":2,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-11-23T21:38:49.000Z","date":"2016-11-22","kind":"sale","acquired":false,"shares":12819,"price":15.77,"value":202155.63,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 12,111 shares disposed of by Polaris Venture Partners VI, L.P. (\"PVP VI\") and 708 shares disposed of by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\")."},{"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 $15.75 to $15.86, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"3,801,479 of these shares are owned directly by PVP VI and 222,145 of the shares are owned by PVPFF VI (together with PVP VI, the \"Polaris Funds\"). Polaris Venture Management Co. VI, L.L.C. (\"Polaris Management\") is the general partner of each of the Polaris Funds. Kevin Bitterman, a member of the Board of Directors of the Issuer, has an assignee interest in Polaris Management. Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein."}],"balance_after":4023624,"source":{"system":"sec-edgar","filing":"0000899243-16-034344","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924316034344/doc4.xml","form_type":"4"}},{"id":4548716,"issuer":{"id":5502,"kind":"organization","name":"Editas Medicine, Inc.","symbol":"EDIT"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":2,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-11-18T22:46:58.000Z","date":"2016-11-16","kind":"sale","acquired":false,"shares":30830,"price":16.3,"value":502529.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 29,128 shares disposed of by Polaris Venture Partners VI, L.P. (\"PVP VI\") and 1,702 shares disposed of by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\")."},{"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 $16.25 to $16.5167, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"3,813,590 of these shares are owned directly by PVP VI and 222,853 of the shares are owned by PVPFF VI (together with PVP VI, the \"Polaris Funds\"). Polaris Venture Management Co. VI, L.L.C. (\"Polaris Management\") is the general partner of each of the Polaris Funds. Kevin Bitterman, a member of the Board of Directors of the Issuer, has an assignee interest in Polaris Management. Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein."}],"balance_after":4036443,"source":{"system":"sec-edgar","filing":"0000899243-16-033918","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924316033918/doc4.xml","form_type":"4"}},{"id":4552917,"issuer":{"id":5502,"kind":"organization","name":"Editas Medicine, Inc.","symbol":"EDIT"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":2,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-11-16T21:47:58.000Z","date":"2016-11-15","kind":"sale","acquired":false,"shares":498,"price":17.78,"value":8854.44,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F7","text":"Represents 472 shares disposed of by PVP VI and 26 shares disposed of by PVPFF VI."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.50 to $17.86, inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"3,842,718 of these shares are owned directly by PVP VI and 224,555 of the shares are owned by PVPFF VI. Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein."}],"balance_after":4067273,"source":{"system":"sec-edgar","filing":"0000899243-16-033690","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924316033690/doc4.xml","form_type":"4"}},{"id":4552916,"issuer":{"id":5502,"kind":"organization","name":"Editas Medicine, Inc.","symbol":"EDIT"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":2,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-11-16T21:47:58.000Z","date":"2016-11-15","kind":"sale","acquired":false,"shares":30367,"price":16.55,"value":502573.85,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Represents 28,689 shares disposed of by PVP VI and 1,678 shares disposed of by PVPFF VI."},{"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 $16.50 to $17.09, inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"3,843,190 of these shares are owned directly by PVP VI and 224,581 of the shares are owned by PVPFF VI. Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein."}],"balance_after":4067771,"source":{"system":"sec-edgar","filing":"0000899243-16-033690","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924316033690/doc4.xml","form_type":"4"}},{"id":4552915,"issuer":{"id":5502,"kind":"organization","name":"Editas Medicine, Inc.","symbol":"EDIT"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":2,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-11-16T21:47:58.000Z","date":"2016-11-14","kind":"sale","acquired":false,"shares":58035,"price":17.16,"value":995880.6,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents 54,831 shares disposed of by Polaris Venture Partners VI, L.P. (\"PVP VI\") and 3,204 shares disposed of by Polaris Venture Partners Founders' Fund VI, L.P (\"PVPFF VI\")."},{"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 $17.00 to $17.51, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2),(5), and (8) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"3,871,879 of these shares are owned directly by PVP VI and 226,259 of the shares are owned by PVPFF VI (together with PVP VI, the \"Polaris Funds\"). Polaris Venture Management Co. VI, L.L.C. (\"Polaris Management\") is the general partner of each of the Polaris Funds. Kevin Bitterman, a member of the Board of Directors of the Issuer, has an assignee interest in Polaris Management. Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein."}],"balance_after":4098138,"source":{"system":"sec-edgar","filing":"0000899243-16-033690","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924316033690/doc4.xml","form_type":"4"}},{"id":4605886,"issuer":{"id":5502,"kind":"organization","name":"Editas Medicine, Inc.","symbol":"EDIT"},"owners":[{"id":90383,"kind":"organization","name":"Polaris Venture Management Co. VI, L.L.C.","position":1,"cik":"0001665594","reported_name":"Polaris Venture Management Co. VI, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90386,"kind":"organization","name":"Polaris Venture Partners VI, L.P.","position":2,"cik":"0001493463","reported_name":"Polaris Venture Partners VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":90385,"kind":"organization","name":"Polaris Venture Partners Founders' Fund VI, L.P.","position":3,"cik":"0001575691","reported_name":"Polaris Venture Partners Founders' Fund VI, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-09-12T20:30:27.000Z","date":"2016-09-08","kind":"sale","acquired":false,"shares":500000,"price":16.8,"value":8400000.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"3,926,710 of these shares are owned directly by Polaris Venture Partners VI, L.P. and 229,463 of the shares are owned by Polaris Venture Partners Founders' Fund VI, L.P. (together with Polaris Venture Partners VI, L.P., the \"Polaris Funds\").  Polaris Venture Management Co. VI, L.L.C. (\"Polaris Management\") is the general partner of each of the Polaris Funds. Kevin Bitterman, a member of the Board of Directors of the Issuer, has an assignee interest in Polaris Management.  Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein."}],"balance_after":4156173,"source":{"system":"sec-edgar","filing":"0000899243-16-028807","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1493463/000089924316028807/doc4.xml","form_type":"4"}}]}