{"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"}}]}