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These shares were sold in multiple transactions at prices ranging from $26.28 to $26.43, inclusive."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The reported securities are held directly by The Rosenthal Family Revocable Trust Dated November 4, 1994, as restated on June 9, 1999, for which the Reporting Person serves as trustee."}],"balance_after":2512500,"source":{"system":"sec-edgar","filing":"0001209191-21-057273","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1757770/000120919121057273/doc4.xml","form_type":"4"}},{"id":2562074,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":10217,"kind":"person","name":"Rosenthal Arnon","position":1,"cik":"0001757770","reported_name":"Rosenthal Arnon","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2021-09-22T20:54:53.000Z","date":"2021-09-20","kind":"sale","acquired":false,"shares":91954,"price":25.7579,"value":2368541.9366,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 20, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.25 to $26.17, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and\nExchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in\nfootnotes (2) and (4) through (6) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The reported securities are held directly by The Rosenthal Family Revocable Trust Dated November 4, 1994, as restated on June 9, 1999, for which the Reporting Person serves as trustee."}],"balance_after":2520546,"source":{"system":"sec-edgar","filing":"0001209191-21-057273","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1757770/000120919121057273/doc4.xml","form_type":"4"}},{"id":2718799,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":10217,"kind":"person","name":"Rosenthal Arnon","position":1,"cik":"0001757770","reported_name":"Rosenthal Arnon","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2021-05-11T22:22:12.000Z","date":"2021-05-07","kind":"grant","acquired":true,"shares":150000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reported shares are represented by performance share units, or PSUs. Fifty percent of the award will be earned if the Issuer's average closing stock price is $30 per share for 40 consecutive trading days and an additional fifty percent will be earned if the average closing stock price is $40 per share for 40 consecutive trading days. Upon attainment of the performance metrics, the shares vest in four equal quarterly installments beginning on the first vesting date as set forth in the PSU award agreement."}],"balance_after":1455226,"source":{"system":"sec-edgar","filing":"0001209191-21-031831","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1757770/000120919121031831/doc4.xml","form_type":"4"}},{"id":3013556,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":10217,"kind":"person","name":"Rosenthal Arnon","position":1,"cik":"0001757770","reported_name":"Rosenthal Arnon","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Stock Option (right to buy)","published_at":"2020-10-05T20:27:04.000Z","date":"2020-10-01","kind":"grant","acquired":true,"shares":457038,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One forty-eighth (1/48th) of the shares subject to the option shall vest on the one month anniversary of October 1, 2020 (the \"Vesting Commencement Date\"), and one forty-eighth (1/48th) of the shares shall vest each month thereafter on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month), subject to the Reporting Person continuing to be a service provider to the Issuer through each such date."}],"balance_after":457038,"derivative":{"exercise_price":10.24,"expiration_date":"2030-09-30","underlying":"Common Stock","underlying_shares":457038},"source":{"system":"sec-edgar","filing":"0001209191-20-053597","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1757770/000120919120053597/doc4.xml","form_type":"4"}},{"id":3376518,"issuer":{"id":6051,"kind":"organization","name":"Alector, Inc.","symbol":"ALEC"},"owners":[{"id":10217,"kind":"person","name":"Rosenthal Arnon","position":1,"cik":"0001757770","reported_name":"Rosenthal Arnon","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Stock Option (right to buy)","published_at":"2019-11-08T21:31:04.000Z","date":"2019-11-06","kind":"grant","acquired":true,"shares":520000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"One forty-eighth (1/48th) of the shares subject to the option shall vest on the one month anniversary of November 6, 2019 (the \"Vesting Commencement Date\"), and one forty-eighth (1/48th) of the shares shall vest each month thereafter on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month), subject to the Reporting Person continuing to have a Service Relationship (as defined in the Issuer's 2019 Equity Incentive Plan) with the Issuer through each such date."}],"balance_after":520000,"derivative":{"exercise_price":17.15,"expiration_date":"2029-11-05","underlying":"Common Stock","underlying_shares":520000},"source":{"system":"sec-edgar","filing":"0001209191-19-055823","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1757770/000120919119055823/doc4.xml","form_type":"4"}}]}