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Form SCHEDULE 13G/A Verastem, Inc. Filed by: Foresite Capital Fund VI LP

May 15, 2026 4:30 PM





Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)




schemaVersion:


SCHEDULE 13G




Comment for Type of Reporting Person: Note to Row 5: 3,146,631 shares, except that Foresite Capital Management VI, LLC ("FCM VI"), the general partner of Foresite Capital Fund VI LP ("FCF VI"), may be deemed to have sole power to vote these shares, and James B. Tananbaum ("Tananbaum"), the managing member of FCM VI, may be deemed to have sole power to vote these shares. Note to Row 6: See response to row 5. Note to Row 7: 3,146,631 shares, except that FCM VI, the general partner of FCF VI, may be deemed to have sole power to dispose of these shares, and Tananbaum, the managing member of FCM VI, may be deemed to have sole power to dispose of these shares. Note to Row 8: See response to row 7. Note to Row 11: This percentage is calculated based upon 87,873,639 shares of Common Stock outstanding of Verastem, Inc. (the "Issuer") as of May 4, 2026, as set forth in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on May 7, 2026.


SCHEDULE 13G




Comment for Type of Reporting Person: Note to Row 5: 3,146,631 shares, all of which are directly owned by FCF VI. FCM VI, the general partner of FCF VI, may be deemed to have sole power to vote these shares, and Tananbaum, the managing member of FCM VI, may be deemed to have sole power to vote these shares. Note to Row 6: See response to row 5. Note to Row 7: 3,146,631 shares, all of which are directly owned by FCF VI. FCM VI, the general partner of FCF VI, may be deemed to have sole power to dispose of these shares, and Tananbaum, the managing member of FCM VI, may be deemed to have sole power to dispose of these shares. Note to Row 8: See response to row 7. Note to Row 11: This percentage is calculated based upon 87,873,639 shares of Common Stock outstanding of the Issuer as of May 4, 2026, as set forth in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on May 7, 2026.


SCHEDULE 13G




Comment for Type of Reporting Person: Note to Row 5: 3,146,631 shares, all of which are directly owned by FCF VI. Tananbaum is the managing member of FCM VI, which is the general partner of FCF VI. Tananbaum may be deemed to have sole power to vote these shares. Note to Row 6: See response to row 5. Note to Row 7: 3,146,631 shares, all of which are directly owned by FCF VI. Tananbaum is the managing member of FCM VI, which is the general partner of FCF VI. Tananbaum may be deemed to have sole power to dispose of these shares. Note to Row 8: See response to row 7. Note to Row 11: This percentage is calculated based upon 87,873,639 shares of Common Stock outstanding of the Issuer as of May 4, 2026, as set forth in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on May 7, 2026.


SCHEDULE 13G



Foresite Capital Fund VI LP
Signature:/s/ James B. Tananbaum
Name/Title:James B. Tananbaum, Managing Member of the General Partner
Date:05/15/2026
Foresite Capital Management VI LLC
Signature:/s/ James B. Tananbaum
Name/Title:James B. Tananbaum, Managing Member
Date:05/15/2026
Tananbaum James B.
Signature:/s/ James B. Tananbaum
Name/Title:James B. Tananbaum
Date:05/15/2026
Exhibit Information

Exhibit A Agreement of Joint Filing The undersigned hereby agree that a single Schedule 13G (or any amendment thereto) relating to the Common Stock of the Issuer shall be filed on behalf of each of the undersigned. Note that a copy of the applicable Agreement of Joint Filing is already on file with the appropriate agencies.

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