Daniel Calkins - 21 Sep 2026 Form 4 Insider Report for Verastem, Inc. (VSTM)

Reporting relationship: Chief Financial Officer
Issuer ticker: VSTM
Reported as of: 21 Sep 2026
Net transaction value: -$424
SEC form: 4
Accepted by SEC: 23 Sep 2026, 20:10:13 UTC
Prior SEC filing: 24 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Daniel Calkins

Key filing fact

Daniel Calkins filed Form 4 for Verastem, Inc. (VSTM) on 23 Sep 2026.

Key facts

This page summarizes Daniel Calkins's Form 4 filing for Verastem, Inc. (VSTM).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 23 Sep 2026, 20:10.

Change

Previous filing in this sequence was filed on 24 Jun 2026.
Current net transaction value: -$424.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001951861 Primary reporting owner

Calkins Daniel

Relationship: Chief Financial Officer
Address: C/O VERASTEM, INC.,, 117 KENDRICK ST., SUITE 500, NEEDHAM
Signature: /s/ Daniel Calkins
Signature date: 23 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

VSTM transaction

Common Stock

Sale

Transaction value: $424
Shares: -55
Change %: -0.05%
Price: $7.70
Shares after: 118,014
Date: 21 Sep 2026
Ownership: Direct
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 2 footnotes

Footnote F1

The sale reported on this Form 4 represents shares sold by the Reporting Person to satisfy statutory withholding requirements in connection with the vesting of restricted stock units.

Footnote F2

The total number of shares beneficially owned includes 831 shares of common stock acquired pursuant to the Issuer's 2018 Employee Stock Purchase Plan.