STTK insider reports 968-share tax withholding

Shattuck Labs, Inc. executive Stephen Stout reported a small tax-related share disposition.

Rhea-AI Filing Summary

Shattuck Labs, Inc. executive Stephen Stout reported a small tax-related share disposition. On this Form 4, 968 shares of Common Stock were withheld at $6.85 per share to cover tax obligations, a non-market transaction. After this withholding, Stout directly holds 80,561 shares of Shattuck Labs common stock.

Insider Trade Summary

Exercise Price or Tax Liability: 968 shares

Exercise Price or Tax Liability 1 txn

Insider Stout Stephen

Role See Remarks

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	968	$6.85	$7K

Holdings After Transaction: Common Stock — 80,561 shares (Direct)

Key Figures

Shares withheld for taxes: 968 shares Withholding price: $6.85 per share Shares owned after transaction: 80,561 shares

3 metrics

Shares withheld for taxes 968 shares Tax-withholding disposition on Common Stock

Withholding price $6.85 per share Value used for tax-withholding disposition

Shares owned after transaction 80,561 shares Direct holdings following tax withholding

Key Terms

Common Stock, tax-withholding disposition, Payment of exercise price or tax liability by delivering securities

3 terms

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

tax-withholding disposition financial

"transaction_action: "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Payment of exercise price or tax liability by delivering securities financial

"transaction_code_description: "Payment of exercise price or tax liability by delivering securities""

FAQ

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

What insider transaction did STTK executive Stephen Stout report on this Form 4?

Stephen Stout reported a tax-related disposition of 968 Shattuck Labs shares. These shares were withheld by the company to satisfy tax obligations, rather than sold on the open market, and reflect a routine compensation-related adjustment.

Was the STTK Form 4 transaction an open-market sale of Shattuck Labs stock?

No, the Form 4 for STTK shows a tax-withholding disposition, not an open-market sale. The company withheld 968 shares at $6.85 per share to cover tax liabilities tied to equity compensation.

How many Shattuck Labs (STTK) shares does Stephen Stout hold after this Form 4 transaction?

After the reported tax-withholding transaction, Stephen Stout directly holds 80,561 shares of Shattuck Labs common stock. This figure reflects his remaining direct ownership following the 968-share disposition for tax purposes.

What does transaction code F mean in the STTK Form 4 filing?

Transaction code F on the STTK Form 4 indicates a payment of tax liability by delivering securities. In this case, 968 Shattuck Labs common shares were withheld at $6.85 each to satisfy tax obligations connected to an equity award.

Is the STTK Form 4 transaction likely to signal a change in insider sentiment?

The STTK Form 4 describes a tax-withholding disposition, which is typically routine and mechanical. Because the shares were withheld to cover taxes rather than sold voluntarily, it generally carries limited information about the insider’s view of Shattuck Labs’ prospects.

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

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Accepted by SEC EDGAR 05/12/2026 - 05:36 PM 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^*

Stout Stephen

(Last) (First) (Middle)

C/O SHATTUCK LABS, INC.

500 W. 5TH STREET, SUITE 1200

(Street)

AUSTIN TEXAS 78701

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Shattuck Labs, Inc. [ STTK ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/10/2026

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	05/10/2026		F		968	D	$6.85	80,561	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:

Remarks:

General Counsel, Corporate Secretary and Chief Ethics and Compliance Officer

	/s/ Stephen Stout	05/12/2026
	** 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)