Verastem CFO sells shares for RSU tax withholding

Verastem, Inc. Chief Financial Officer Daniel Calkins reported selling 4,089 shares of common stock.

Rhea-AI Filing Summary

Verastem, Inc. Chief Financial Officer Daniel Calkins reported selling 4,089 shares of common stock. The transactions on June 22, 2026 consisted of open-market sales of 57 shares at $4.13 per share and 4,032 shares at $4.18 per share.

According to the footnote, these sales were made to satisfy statutory withholding requirements tied to the vesting of restricted stock units, meaning they were compensation-related rather than discretionary portfolio trades.

Insider Trade Summary 10b5-1

Net Seller: 4,089 shares

Net Sell 2 txns

Insider Calkins Daniel

Role Chief Financial Officer

Sold 4,089 shs ($17K)

Type	Security	Shares	Price	Value
Sale	Common Stock	4,032	$4.18	$17K
Sale	Common Stock	57	$4.13	$235.41

Holdings After Transaction: Common Stock — 117,238 shares (Direct)

Footnotes (1)

1. 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.

Key Figures

Total shares sold: 4,089 shares First sale tranche: 57 shares at $4.13/share Second sale tranche: 4,032 shares at $4.18/share

3 metrics

Total shares sold 4,089 shares Common stock sold by CFO on June 22, 2026

First sale tranche 57 shares at $4.13/share Open-market sale of common stock on June 22, 2026

Second sale tranche 4,032 shares at $4.18/share Open-market sale of common stock on June 22, 2026

Key Terms

restricted stock units, statutory withholding requirements, open-market sale, Form 4

4 terms

restricted stock units financial

"in connection with the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

statutory withholding requirements financial

"shares sold by the Reporting Person to satisfy statutory withholding requirements"

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"The sale reported on this Form 4 represents shares sold"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

What did Verastem (VSTM) CFO Daniel Calkins report in this Form 4?

Verastem CFO Daniel Calkins reported selling 4,089 shares of common stock. The sales occurred on June 22, 2026 and were linked to tax withholding obligations from vesting restricted stock units, rather than a discretionary sale of a large existing stake.

How many Verastem (VSTM) shares did the CFO sell and at what prices?

Daniel Calkins sold a total of 4,089 Verastem common shares. The filing shows 57 shares sold at $4.13 per share and 4,032 shares sold at $4.18 per share, all on June 22, 2026, according to the reported transactions.

Why were the Verastem (VSTM) CFO’s shares sold in this transaction?

The filing states the shares were sold to satisfy statutory withholding requirements. These obligations arose in connection with the vesting of restricted stock units, indicating the transactions were related to compensation and associated taxes rather than a voluntary reduction of the CFO’s investment position.

Were the Verastem (VSTM) CFO’s transactions open-market sales?

Yes, the Form 4 classifies both transactions as open-market sales of common stock. However, the footnote clarifies they were executed specifically to cover statutory tax withholding tied to restricted stock unit vesting, which typically reflects a mechanical, compensation-driven process.

Does this Verastem (VSTM) Form 4 involve derivative securities or options?

No derivative transactions are listed in this Form 4. The derivativeSummary section is empty, and both reported entries involve non-derivative common stock sales associated with tax withholding on restricted stock unit vesting for the company’s Chief Financial Officer.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 06/24/2026 - 04:44 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).

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 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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/22/2026

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	06/22/2026		S		4,032(1)	D	$4.18	117,295	D
Common Stock	06/22/2026		S		57(1)	D	$4.13	117,238	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	06/24/2026
	** 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)