Shattuck Labs director granted 81,000 stock options

Shattuck Labs, Inc. director Clay B. Siegall received a grant of stock options covering 81,000 shares of common stock.

Rhea-AI Filing Summary

Shattuck Labs, Inc. director Clay B. Siegall received a grant of stock options covering 81,000 shares of common stock. The options have an exercise price of $5.95 per share and expire on May 29, 2036. They vest in full on the earlier of the one-year anniversary of the grant date or immediately before the company’s next annual stockholder meeting, as long as he continues serving the company. This is a compensation-related award, not an open-market purchase or sale, and results in 81,000 derivative securities held after the transaction.

Insider Trade Summary

Grant/Award: 81,000 shares

Grant/Award 1 txn

Insider SIEGALL CLAY B

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy)	81,000	$0.00	$0.00

Holdings After Transaction: Stock Option (Right to Buy) — 81,000 contracts (Direct)

Footnotes (1)

1. F1. This option represents the right to purchase a total of 81,000 shares of the Issuer's common stock, which will vest in full on the earlier of the one-year anniversary of the grant date or immediately prior to the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service to the Issuer.

Key Figures

Options granted: 81,000 options Exercise price: $5.95 per share Shares underlying options: 81,000 shares +2 more

5 metrics

Options granted 81,000 options Stock Option (Right to Buy) grant to director

Exercise price $5.95 per share Conversion or exercise price for options

Shares underlying options 81,000 shares Underlying common stock linked to option grant

Expiration date May 29, 2036 Option expiration for director grant

Post-transaction derivative holdings 81,000 options Total derivative securities following this grant

Key Terms

Stock Option (Right to Buy), exercise price, expiration date, vest in full, +1 more

5 terms

Stock Option (Right to Buy) financial

"security_title: Stock Option (Right to Buy)"

exercise price financial

"conversion_or_exercise_price: 5.9500"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

expiration date financial

"expiration_date: 2036-05-29T00:00:00.000Z"

The expiration date is the deadline after which a financial contract, such as an option or a futures agreement, is no longer valid or can be exercised. It matters to investors because it determines the timeframe during which they can take action or benefit from the contract, similar to how a coupon or a food item has a limited period of usefulness. Once the expiration date passes, the contract loses its value or ability to be used.

vest in full financial

"which will vest in full on the earlier of the one-year anniversary"

annual meeting of stockholders financial

"immediately prior to the Issuer's next annual meeting of stockholders"

FAQ

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

What did the Form 4 for Shattuck Labs (STTK) report for Clay B. Siegall?

The Form 4 reports that director Clay B. Siegall received a grant of stock options for 81,000 shares of Shattuck Labs common stock. These options are part of his compensation and give him the right to buy shares at a fixed exercise price in the future.

How many Shattuck Labs (STTK) options did Clay B. Siegall receive and at what price?

Clay B. Siegall received options on 81,000 shares of Shattuck Labs common stock with an exercise price of $5.95 per share. This means he can later purchase those shares at $5.95, regardless of the market price at the time of exercise.

When do Clay B. Siegall’s Shattuck Labs (STTK) stock options vest?

The options vest in full on the earlier of the one-year anniversary of the grant date or immediately before Shattuck Labs’ next annual stockholder meeting. Vesting is conditional on his continued service to the company during this period.

Do the reported Shattuck Labs (STTK) option grants involve open-market buying or selling?

No, the reported transaction is a grant of stock options as compensation, not an open-market purchase or sale. Siegall did not buy or sell shares in the market; he received the right to buy 81,000 shares at a set price in the future.

What is the expiration date of Clay B. Siegall’s Shattuck Labs (STTK) stock options?

The stock options granted to Clay B. Siegall expire on May 29, 2036. If he does not exercise them by that date, his right to buy the 81,000 shares at the $5.95 exercise price will lapse and become worthless.

How many derivative securities does Clay B. Siegall hold after this Shattuck Labs (STTK) grant?

After the grant, Clay B. Siegall holds 81,000 derivative securities in the form of stock options. Each option corresponds to one share of Shattuck Labs common stock, giving him the right to purchase that share at the specified exercise price.

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

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Accepted by SEC EDGAR 06/02/2026 - 08:00 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^*

SIEGALL CLAY B

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/29/2026

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

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
Stock Option (Right to Buy)	$5.95	05/29/2026		A		81,000		(1)	05/29/2036	Common Stock	81,000	$0	81,000	D

Explanation of Responses:

1. This option represents the right to purchase a total of 81,000 shares of the Issuer's common stock, which will vest in full on the earlier of the one-year anniversary of the grant date or immediately prior to the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service to the Issuer.

	/s/ Andrew R. Neill, Attorney-in-Fact for Clay B. Siegall	06/02/2026
	** 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)