Verastem director granted 36,000 RSUs

Rowinsky Eric K reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Rowinsky Eric K reported acquisition or exercise transactions in this Form 4 filing.

Verastem, Inc. director Eric K. Rowinsky received a grant of 36,000 restricted stock units (RSUs). The grant was made at a price of $0.00 per share under Verastem’s Amended and Restated 2021 Equity Incentive Plan, reflecting stock-based compensation rather than an open-market purchase.

Each RSU represents the right to receive one share of common stock. The RSUs vest in twelve substantially equal monthly installments from the end of June 2026 through April 2027, with the final installment vesting on the earlier of the day before the 2027 annual stockholders’ meeting or May 31, 2027, contingent on his continued board service. Following this award, Rowinsky directly holds 52,666 shares of Verastem common stock.

Insider Trade Summary

Grant/Award: 36,000 shares

Grant/Award 1 txn

Insider Rowinsky Eric K

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	36,000	$0.00	$0.00

Holdings After Transaction: Common Stock — 52,666 shares (Direct)

Footnotes (1)

1. F1. RSUs granted to the Reporting Person under the Issuer's Amended and Restated 2021 Equity Incentive Plan. Each RSU represents the contingent right to receive one share of Common Stock. The 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). 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.

Key Figures

RSUs granted: 36,000 units Grant price: $0.00 per share Shares held after grant: 52,666 shares +2 more

5 metrics

RSUs granted 36,000 units Restricted stock units awarded to director Eric K. Rowinsky

Grant price $0.00 per share Equity compensation, not an open-market purchase

Shares held after grant 52,666 shares Rowinsky’s direct Verastem common stock holdings post-transaction

Vesting period start June 2026 First of eleven monthly vesting installments

Final vesting deadline May 31, 2027 Final installment vests by this date or the day before 2027 meeting

Key Terms

RSUs, Amended and Restated 2021 Equity Incentive Plan, vest, Annual Meeting of Stockholders

4 terms

RSUs financial

"RSUs granted to the Reporting Person under the Issuer's Amended and Restated 2021 Equity Incentive Plan."

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

Amended and Restated 2021 Equity Incentive Plan financial

"RSUs granted to the Reporting Person under the Issuer's Amended and Restated 2021 Equity Incentive Plan."

vest financial

"The RSUs vest in twelve substantially equal installments (rounded down to the nearest whole share..."

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

Annual Meeting of Stockholders financial

"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..."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Verastem (VSTM) disclose in this Form 4 for Eric K. Rowinsky?

Verastem reported a stock-based compensation grant to director Eric K. Rowinsky. He received 36,000 restricted stock units at a price of $0.00 per share, increasing his direct holdings to 52,666 common shares after the award.

How many Verastem RSUs were granted to director Eric K. Rowinsky?

Eric K. Rowinsky received 36,000 restricted stock units from Verastem. Each RSU represents a contingent right to one share of common stock, issued as equity compensation under the company’s Amended and Restated 2021 Equity Incentive Plan.

What is the vesting schedule for Eric K. Rowinsky’s 36,000 Verastem RSUs?

The 36,000 RSUs vest in twelve substantially equal monthly installments. Vesting runs from the last day of each month between June 2026 and April 2027, with the final installment vesting by the earlier of the day before the 2027 annual meeting or May 31, 2027.

Are Eric K. Rowinsky’s Verastem RSUs subject to continued board service?

Yes, vesting depends on continued service as a Verastem director. Each monthly installment, including the final tranche tied to the 2027 annual meeting or May 31, 2027, requires that Rowinsky still be serving on the board on the applicable vesting date.

How many Verastem shares does Eric K. Rowinsky hold after this RSU grant?

Following the RSU grant, Eric K. Rowinsky directly holds 52,666 shares of Verastem common stock. This figure reflects his position after the 36,000 restricted stock units were awarded as equity compensation, as reported in the Form 4.

Was this Verastem (VSTM) Form 4 transaction an open-market stock purchase?

No, the transaction reflects a grant of restricted stock units at $0.00 per share. It is a compensation award under Verastem’s 2021 Equity Incentive Plan, not an open-market buy or sell of existing common shares by the director.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/26/2026 - 06:21 PM EDT Learn about SEC filing dates

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

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^*

Rowinsky Eric K

(Last) (First) (Middle)

C/O VERASTEM, INC.,

117 KENDRICK ST., SUITE 500

(Street)

NEEDHAM MASSACHUSETTS 02494

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

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

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

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

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	05/21/2026		A		36,000(1)	A	$0.00	52,666	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. RSUs granted to the Reporting Person under the Issuer's Amended and Restated 2021 Equity Incentive Plan. Each RSU represents the contingent right to receive one share of Common Stock. The 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). 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.

	/s/ Daniel Calkins, Attorney in Fact	05/26/2026
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)