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The Initial Grant RSUs vest in twelve substantially equal installments (rounded down to the nearest whole share on each vesting date except with respect to the final vesting date on which the remaining unvested portion shall vest) on each quarterly anniversary of May 21, 2026 (the \"Start Date\") until the award is fully vested on the date that is three (3) years from the Start Date, provided that the Reporting Person continues to serve as a director of the Issuer on each such vesting date."}],"balance_after":108000,"source":{"system":"sec-edgar","filing":"0001104659-26-067048","document":"tm2615478-6_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1255856/000110465926067048/tm2615478-6_4seq1.xml","form_type":"4"}},{"id":764073,"issuer":{"id":5242,"kind":"organization","name":"Verastem, Inc.","symbol":"VSTM"},"owners":[{"id":44283,"kind":"person","name":"Tollefson Karin Anna","position":1,"cik":"0001976551","reported_name":"Tollefson Karin Anna","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-26T22:23:36.000Z","date":"2026-05-21","kind":"grant","planned":false,"acquired":true,"shares":36000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"RSUs granted to the Reporting Person under the Issuer's Amended and Restated 2021 Equity Incentive Plan. 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The first eleven installments shall vest beginning on the last day of each month over a period from June, 2026 to April, 2027 and the last installment shall vest on the earlier of (i) the day before the 2027 Annual Meeting of Stockholders is held or (ii) May 31, 2027, provided that the Reporting Person continues to serve as a director of the Issuer on each such vesting date."}],"balance_after":52666,"source":{"system":"sec-edgar","filing":"0001104659-26-066421","document":"tm2615478-7_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1755098/000110465926066421/tm2615478-7_4seq1.xml","form_type":"4"}},{"id":763312,"issuer":{"id":5242,"kind":"organization","name":"Verastem, Inc.","symbol":"VSTM"},"owners":[{"id":44129,"kind":"person","name":"Kapur Anil","position":1,"cik":"0001730703","reported_name":"Kapur Anil","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-26T22:18:10.000Z","date":"2026-05-21","kind":"grant","planned":false,"acquired":true,"shares":36000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"RSUs granted to the Reporting Person under the Issuer's Amended and Restated 2021 Equity Incentive Plan. 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The first eleven installments shall vest beginning on the last day of each month over a period from June, 2026 to April, 2027 and the last installment shall vest on the earlier of (i) the day before the 2027 Annual Meeting of Stockholders is held or (ii) May 31, 2027, provided that the Reporting Person continues to serve as a director of the Issuer on each such vesting date."}],"balance_after":52666,"source":{"system":"sec-edgar","filing":"0001104659-26-066418","document":"tm2615478-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1526119/000110465926066418/tm2615478-2_4seq1.xml","form_type":"4"}},{"id":763311,"issuer":{"id":5242,"kind":"organization","name":"Verastem, Inc.","symbol":"VSTM"},"owners":[{"id":44128,"kind":"person","name":"Bunn Paul A.","position":1,"cik":"0001868760","reported_name":"Bunn Paul A.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-26T22:12:57.000Z","date":"2026-05-21","kind":"grant","planned":false,"acquired":true,"shares":36000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"RSUs granted to the Reporting Person under the Issuer's Amended and Restated 2021 Equity Incentive Plan. 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The first eleven installments shall vest beginning on the last day of each month over a period from June, 2025 to April, 2026 and the last installment shall vest on the earlier of (i) the day before the 2026 Annual Meeting of Stockholders is held or (ii) May 31, 2026, provided that the Reporting Person continues to serve as a director of the Issuer on each such vesting date."}],"balance_after":17216,"source":{"system":"sec-edgar","filing":"0001104659-25-053096","document":"tm2516118-4_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1364719/000110465925053096/tm2516118-4_4seq1.xml","form_type":"4"}},{"id":1133661,"issuer":{"id":5242,"kind":"organization","name":"Verastem, Inc.","symbol":"VSTM"},"owners":[{"id":44283,"kind":"person","name":"Tollefson Karin Anna","position":1,"cik":"0001976551","reported_name":"Tollefson Karin Anna","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-05-27T21:43:08.000Z","date":"2025-05-22","kind":"grant","planned":false,"acquired":true,"shares":12500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The stock option vests in twelve equal installments (rounded down to the nearest whole share on each vesting date except with respect to the final vesting date on which the remaining unvested portion shall vest). The first eleven installments shall vest beginning on the last day of each month over a period from June, 2025 to April, 2026 and the last installment shall vest on the earlier of (i) the day before the 2026 Annual Meeting of Stockholders is held or (ii) May 31, 2026, provided that the Reporting Person continues to serve as a director of the Issuer on each such vesting date."}],"balance_after":12500,"derivative":{"exercise_price":7.48,"expiration_date":"2035-05-22","underlying":"Common Stock","underlying_shares":12500},"source":{"system":"sec-edgar","filing":"0001104659-25-053095","document":"tm2516118-3_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1976551/000110465925053095/tm2516118-3_4seq1.xml","form_type":"4"}},{"id":1133660,"issuer":{"id":5242,"kind":"organization","name":"Verastem, Inc.","symbol":"VSTM"},"owners":[{"id":44283,"kind":"person","name":"Tollefson Karin Anna","position":1,"cik":"0001976551","reported_name":"Tollefson Karin Anna","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-27T21:43:08.000Z","date":"2025-05-22","kind":"grant","planned":false,"acquired":true,"shares":8333,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"RSUs granted to the Reporting Person under the Issuer's Amended and Restated 2021 Equity Incentive Plan. 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The first eleven installments shall vest beginning on the last day of each month over a period from June, 2025 to April, 2026 and the last installment shall vest on the earlier of (i) the day before the 2026 Annual Meeting of Stockholders is held or (ii) May 31, 2026, provided that the Reporting Person continues to serve as a director of the Issuer on each such vesting date."}],"balance_after":16666,"source":{"system":"sec-edgar","filing":"0001104659-25-053095","document":"tm2516118-3_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1976551/000110465925053095/tm2516118-3_4seq1.xml","form_type":"4"}},{"id":1133277,"issuer":{"id":5242,"kind":"organization","name":"Verastem, Inc.","symbol":"VSTM"},"owners":[{"id":13228,"kind":"person","name":"JOHNSON JOHN","position":1,"cik":"0001410781","reported_name":"JOHNSON JOHN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-05-27T21:42:07.000Z","date":"2025-05-22","kind":"grant","planned":false,"acquired":true,"shares":12500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The stock option vests in twelve equal installments (rounded down to the nearest whole share on each vesting date except with respect to the final vesting date on which the remaining unvested portion shall vest). The first eleven installments shall vest beginning on the last day of each month over a period from June, 2025 to April, 2026 and the last installment shall vest on the earlier of (i) the day before the 2026 Annual Meeting of Stockholders is held or (ii) May 31, 2026, provided that the Reporting Person continues to serve as a director of the Issuer on each such vesting date."}],"balance_after":12500,"derivative":{"exercise_price":7.48,"expiration_date":"2035-05-22","underlying":"Common Stock","underlying_shares":12500},"source":{"system":"sec-edgar","filing":"0001104659-25-053093","document":"tm2516118-2_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1410781/000110465925053093/tm2516118-2_4seq1.xml","form_type":"4"}},{"id":1133276,"issuer":{"id":5242,"kind":"organization","name":"Verastem, Inc.","symbol":"VSTM"},"owners":[{"id":13228,"kind":"person","name":"JOHNSON JOHN","position":1,"cik":"0001410781","reported_name":"JOHNSON JOHN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-27T21:42:07.000Z","date":"2025-05-22","kind":"grant","planned":false,"acquired":true,"shares":8333,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"RSUs granted to the Reporting Person under the Issuer's Amended and Restated 2021 Equity Incentive Plan. 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The first eleven installments shall vest beginning on the last day of each month over a period from June, 2025 to April, 2026 and the last installment shall vest on the earlier of (i) the day before the 2026 Annual Meeting of Stockholders is held or (ii) May 31, 2026, provided that the Reporting Person continues to serve as a director of the Issuer on each such vesting date."}],"balance_after":16666,"source":{"system":"sec-edgar","filing":"0001104659-25-053093","document":"tm2516118-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1410781/000110465925053093/tm2516118-2_4seq1.xml","form_type":"4"}},{"id":1133134,"issuer":{"id":5242,"kind":"organization","name":"Verastem, Inc.","symbol":"VSTM"},"owners":[{"id":39449,"kind":"person","name":"Rowinsky Eric K","position":1,"cik":"0001318886","reported_name":"Rowinsky Eric K","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-05-27T21:40:59.000Z","date":"2025-05-22","kind":"grant","planned":false,"acquired":true,"shares":12500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The stock option vests in twelve equal installments (rounded down to the nearest whole share on each vesting date except with respect to the final vesting date on which the remaining unvested portion shall vest). The first eleven installments shall vest beginning on the last day of each month over a period from June, 2025 to April, 2026 and the last installment shall vest on the earlier of (i) the day before the 2026 Annual Meeting of Stockholders is held or (ii) May 31, 2026, provided that the Reporting Person continues to serve as a director of the Issuer on each such vesting date."}],"balance_after":12500,"derivative":{"exercise_price":7.48,"expiration_date":"2035-05-22","underlying":"Common Stock","underlying_shares":12500},"source":{"system":"sec-edgar","filing":"0001104659-25-053092","document":"tm2516118-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1318886/000110465925053092/tm2516118-1_4seq1.xml","form_type":"4"}},{"id":1133133,"issuer":{"id":5242,"kind":"organization","name":"Verastem, Inc.","symbol":"VSTM"},"owners":[{"id":39449,"kind":"person","name":"Rowinsky Eric K","position":1,"cik":"0001318886","reported_name":"Rowinsky Eric K","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-27T21:40:59.000Z","date":"2025-05-22","kind":"grant","planned":false,"acquired":true,"shares":8333,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"RSUs granted to the Reporting Person under the Issuer's Amended and Restated 2021 Equity Incentive Plan. 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