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The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option is fully vested at time of grant."}],"balance_after":2068,"derivative":{"exercise_price":9.08,"expiration_date":"2031-04-01","underlying":"Common Stock","underlying_shares":2068},"source":{"system":"sec-edgar","filing":"0000899243-21-014967","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000089924321014967/doc4.xml","form_type":"4"}},{"id":2789228,"issuer":{"id":3793,"kind":"organization","name":"Cogent Biosciences, Inc.","symbol":"COGT"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2021-03-15T23:00:29.000Z","date":"2021-03-11","kind":"grant","acquired":true,"shares":60000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This stock option shall vest in equal monthly installments over a three year period."}],"balance_after":60000,"derivative":{"exercise_price":8.45,"expiration_date":"2031-03-11","underlying":"Common Stock","underlying_shares":60000},"source":{"system":"sec-edgar","filing":"0000899243-21-011694","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000089924321011694/doc4.xml","form_type":"4"}},{"id":2876665,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock, par value $0.0001","published_at":"2021-02-05T21:36:32.000Z","date":"2021-02-04","kind":"sale","acquired":false,"shares":894,"price":11.21,"value":10021.74,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares automatically sold by the reporting person to satisfy tax withholding obligations in connection with the vesting of the restricted stock units granted under the issuer's 2013 Stock Incentive Plan on February 3, 2020. 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These RSUs are scheduled to vest in four equal annual installments over four years from the grant date, with the first installment vesting on February 1, 2022."}],"balance_after":84082,"source":{"system":"sec-edgar","filing":"0000899243-21-004508","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000089924321004508/doc4.xml","form_type":"4"}},{"id":2893510,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock, par value $0.0001","published_at":"2021-01-28T01:42:56.000Z","date":"2021-01-25","kind":"sale","acquired":false,"shares":2872,"price":11.41,"value":32769.52,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares automatically sold by the reporting person to satisfy tax withholding obligations in connection with the vesting of the restricted stock units granted under the issuer's 2013 Stock Incentive Plan on January 24, 2019. The automatic sale of the reporting person's shares is provided for in a restricted stock unit agreement constituting a \"binding contract\" consistent with the affirmative defense to liability under Rule 10b5-1 and the sale does not represent a discretionary trade by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The reporting person acquired (i) 708 shares of Common Stock under the Issuer's 2013 Employee Stock Purchase Plan (the \"2013 ESPP\") on August 31, 2018 and (ii) 614 shares of Common Stock under the 2013 ESPP on February 28, 2019 that were not previously reported on Form 4."}],"balance_after":55957,"source":{"system":"sec-edgar","filing":"0000899243-21-003533","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000089924321003533/doc4.xml","form_type":"4"}},{"id":2915819,"issuer":{"id":3793,"kind":"organization","name":"Cogent Biosciences, Inc.","symbol":"COGT"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2021-01-07T02:48:53.000Z","date":"2021-01-04","kind":"grant","acquired":true,"shares":1641,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option is fully vested at time of grant."}],"balance_after":1641,"derivative":{"exercise_price":7.6191,"expiration_date":"2031-01-04","underlying":"Common Stock","underlying_shares":1641},"source":{"system":"sec-edgar","filing":"0000899243-21-000793","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000089924321000793/doc4.xml","form_type":"4"}},{"id":3016352,"issuer":{"id":3793,"kind":"organization","name":"Cogent Biosciences, Inc.","symbol":"COGT"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2020-10-02T21:30:08.000Z","date":"2020-10-01","kind":"grant","acquired":true,"shares":9247,"price":1.3518,"value":12500.0946,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option is fully vested at time of grant."}],"balance_after":9247,"derivative":{"exercise_price":2.26,"expiration_date":"2030-10-01","underlying":"Common Stock","underlying_shares":9247},"source":{"system":"sec-edgar","filing":"0001209191-20-053276","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000120919120053276/doc4.xml","form_type":"4"}},{"id":3088920,"issuer":{"id":3793,"kind":"organization","name":"Cogent Biosciences, Inc.","symbol":"COGT"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2020-07-06T20:27:44.000Z","date":"2020-07-01","kind":"grant","acquired":true,"shares":35280,"price":0.3118,"value":11000.304,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The option award was issued to the Reporting Person, who elected to take shares in lieu of cash compensation for services as a director, pursuant to the Issuer's non-employee director compensation plan. The number of options granted was determined by dividing the cash compensation otherwise payable with respect to the quarter by the Black-Scholes value of a single option calculated as of the date of the grant."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option is fully vested at time of grant."}],"balance_after":35280,"derivative":{"exercise_price":0.47,"expiration_date":"2030-07-01","underlying":"Common Stock","underlying_shares":35280},"source":{"system":"sec-edgar","filing":"0001209191-20-041017","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000120919120041017/doc4.xml","form_type":"4"}},{"id":3096635,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock, par value $0.0001","published_at":"2020-06-30T12:54:33.000Z","date":"2020-06-26","kind":"sale","acquired":false,"shares":2728,"price":16.15,"value":44057.2,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents shares automatically sold by the reporting person to satisfy tax withholding obligations in connection with the vesting of the restricted stock units described in footnote 1.  The automatic sale of the reporting person's shares is provided for in a restricted stock unit agreement constituting a \"binding contract\" consistent with the affirmative defense to liability under Rule 10b5-1 and the sale does not represent a discretionary trade by the reporting person."}],"balance_after":57507,"source":{"system":"sec-edgar","filing":"0000899243-20-017900","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000089924320017900/doc4.xml","form_type":"4"}},{"id":3096634,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock, par value $0.0001","published_at":"2020-06-30T12:54:33.000Z","date":"2020-06-25","kind":"grant","acquired":true,"shares":6000,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents common stock issued upon vesting of restricted stock units granted under the issuer's 2013 Stock Incentive Plan that vested upon the issuer's achievement of a specified performance target. The transaction date represents the date on which the issuer's Compensation Committee determined that the performance target was achieved."}],"balance_after":60235,"source":{"system":"sec-edgar","filing":"0000899243-20-017900","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000089924320017900/doc4.xml","form_type":"4"}},{"id":3096633,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock, par value 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These shares were sold in multiple transactions at prices ranging from $21.50 per share to $22.00 per share, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":51798,"source":{"system":"sec-edgar","filing":"0000899243-20-017434","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000089924320017434/doc4.xml","form_type":"4"}},{"id":3103181,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock, par value 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These RSUs are scheduled to vest in four equal annual installments over four years from the grant date, with the first installment vesting on January 24, 2020"}],"balance_after":36217,"source":{"system":"sec-edgar","filing":"0000899243-19-002093","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000089924319002093/doc4.xml","form_type":"4"}},{"id":4062960,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2018-02-13T22:08:44.000Z","date":"2018-02-09","kind":"grant","acquired":true,"shares":106344,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option was granted on February 9, 2018 pursuant to the Company's 2013 Stock Incentive Plan with respect to 106,344 shares of Common Stock, with 25% vesting on February 9, 2019 and the remaining 75% vesting in 36 substantially equal monthly installments thereafter."}],"balance_after":106344,"derivative":{"exercise_price":16,"expiration_date":"2028-02-08","underlying":"Common Stock","underlying_shares":106344},"source":{"system":"sec-edgar","filing":"0001209191-18-009640","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000120919118009640/doc4.xml","form_type":"4"}},{"id":4073830,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2018-02-06T21:26:46.000Z","date":"2018-02-05","kind":"exercise","acquired":false,"shares":72264,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The exercise and sale reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"This option is fully vested."}],"balance_after":0,"derivative":{"exercise_price":9.58,"expiration_date":"2027-05-15","underlying":"Common Stock","underlying_shares":72264},"source":{"system":"sec-edgar","filing":"0001209191-18-007843","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000120919118007843/doc4.xml","form_type":"4"}},{"id":4073829,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock, par value $0.0001","published_at":"2018-02-06T21:26:46.000Z","date":"2018-02-05","kind":"sale","acquired":false,"shares":519,"price":17.2,"value":8926.8,"ownership":{"direct":true},"balance_after":2603,"source":{"system":"sec-edgar","filing":"0001209191-18-007843","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000120919118007843/doc4.xml","form_type":"4"}},{"id":4073828,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Commons Stock, par value $0.0001","published_at":"2018-02-06T21:26:46.000Z","date":"2018-02-05","kind":"sale","acquired":false,"shares":71745,"price":16.6251,"value":1192767.7995,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $16.20 per share to $17.15 per share, inclusive.  The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":3122,"source":{"system":"sec-edgar","filing":"0001209191-18-007843","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000120919118007843/doc4.xml","form_type":"4"}},{"id":4073827,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Commons Stock, par value $0.0001","published_at":"2018-02-06T21:26:46.000Z","date":"2018-02-05","kind":"exercise","acquired":true,"shares":72264,"price":9.58,"value":692289.12,"ownership":{"direct":true},"balance_after":74867,"source":{"system":"sec-edgar","filing":"0001209191-18-007843","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000120919118007843/doc4.xml","form_type":"4"}},{"id":4410096,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common stock, par value $0.0001","published_at":"2017-03-02T21:03:56.000Z","date":"2017-02-28","kind":"grant","acquired":true,"shares":1708,"price":6.2135,"value":10612.658,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares were acquired under the Epizyme, Inc. 2013 Employee Stock Purchase Plan in connection with offering period ended February 28, 2017."}],"balance_after":1708,"source":{"system":"sec-edgar","filing":"0001209191-17-016504","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000120919117016504/doc4.xml","form_type":"4"}},{"id":4459579,"issuer":{"id":12703,"kind":"organization","name":"Epizyme, Inc.","symbol":"EPZM"},"owners":[{"id":39276,"kind":"person","name":"Ros Matthew","position":1,"cik":"0001673802","reported_name":"Ros Matthew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2017-02-09T22:53:41.000Z","date":"2017-02-08","kind":"grant","acquired":true,"shares":109866,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option was granted on February 8, 2017 pursuant to the Company's 2013 Stock Incentive Plan with respect to 109,866 shares of Common Stock, with 25% vesting on February 8, 2018 and the remaining 75% vesting in 36 substantially equal monthly installments thereafter."}],"balance_after":109866,"derivative":{"exercise_price":12.45,"expiration_date":"2027-02-07","underlying":"Common Stock","underlying_shares":109866},"source":{"system":"sec-edgar","filing":"0001209191-17-009196","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1673802/000120919117009196/doc4.xml","form_type":"4"}}]}