Verastem (NASDAQ: VSTM) CFO share sale covers RSU tax withholding

Rhea-AI Filing Summary

Verastem, Inc. Chief Financial Officer Form 4 filing reports a small, routine sale of company stock tied to equity compensation. On January 12, 2026, the CFO, Daniel Calkins, sold 5,039 shares of Verastem common stock at $7.16 per share. According to the footnote, this sale was made to satisfy statutory withholding tax requirements in connection with the vesting of restricted stock units, rather than as a discretionary sale of shares.

Following this transaction, the reporting person beneficially owned 104,719 shares of Verastem common stock, held directly. The filing is made by a single reporting person in the capacity of Chief Financial Officer and reflects standard administration of equity awards.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Calkins Daniel

(Last) (First) (Middle)

C/O VERASTEM, INC.,

117 KENDRICK ST., SUITE 500

(Street)

NEEDHAM MA 02494

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Verastem, Inc. [ VSTM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
01/12/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	01/12/2026		S		5,039(1)	D	$7.16	104,719	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

	/s/ Daniel Calkins	01/14/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider transaction did Verastem (VSTM) report in this Form 4?

The Form 4 reports that Verastem's Chief Financial Officer, Daniel Calkins, sold 5,039 shares of Verastem common stock on January 12, 2026 at a price of $7.16 per share.

Why did the Verastem (VSTM) CFO sell 5,039 shares?

The footnote explains that the sale of 5,039 shares was made to satisfy statutory withholding requirements in connection with the vesting of restricted stock units, meaning it was related to tax obligations on equity compensation.

How many Verastem (VSTM) shares does the CFO own after this transaction?

After the reported sale, the Verastem CFO beneficially owned 104,719 shares of Verastem common stock, held directly.

What role does the reporting person hold at Verastem (VSTM)?

The reporting person, Daniel Calkins, is an officer of Verastem and serves as the company's Chief Financial Officer.

Was this Verastem (VSTM) insider transaction reported as a direct or indirect holding?

The transaction and resulting ownership of 104,719 shares are reported as held directly by the CFO, with no indirect ownership nature specified.

Does this Verastem (VSTM) Form 4 indicate multiple reporting persons?

No. The filing indicates it is a Form filed by one reporting person, identifying only the Verastem Chief Financial Officer.