STTK Rule 144 notice for stock-option sale

STTK filing of a Rule 144 notice records an intended sale of Common stock tied to a Stock Option Exercise with a transaction date of 06/30/2026.

Rhea-AI Filing Summary

STTK filing of a Rule 144 notice records an intended sale of Common stock tied to a Stock Option Exercise with a transaction date of 06/30/2026. The filing lists the broker Fidelity Brokerage Services LLC and shows numeric entries including 23365 and 14235.58 in the disclosure.

Insights

Securities Compliance Analyst

Rule 144 notice for a stock-option-related sale on 06/30/2026.

The excerpt lists a proposed sale of Common stock associated with a Stock Option Exercise and indicates 06/30/2026 as the transaction date and Cash as the consideration method. The broker named is Fidelity Brokerage Services LLC.

Cash-flow treatment and exact seller attribution are not detailed in the excerpt; subsequent filings or transaction reports will show completion and final proceeds.

Key Figures

Broker-listed numeric field: 23365 Additional numeric entry: 165469.29 Reference number: 76680517 +2 more

5 metrics

Broker-listed numeric field 23365 Appears on the Common security line next to broker details

Additional numeric entry 165469.29 Numeric value listed on the same Common security line

Reference number 76680517 Numeric value listed on the Common security line

Transaction date 06/30/2026 Date tied to the Stock Option Exercise and Securities To Be Sold lines

Past 3 months entry 14235.58 Numeric figure shown under "Securities Sold During The Past 3 Months" line

Key Terms

Rule 144, Stock Option Exercise, Cash

3 terms

Rule 144 regulatory

"144: Securities To Be Sold"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Stock Option Exercise financial

"Stock Option Exercise | Issuer"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Cash financial

"23365 | 06/30/2026 | Cash"

FAQ

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

What does STTK's Form 144 disclose?

The Form 144 discloses a proposed sale of Common stock tied to a Stock Option Exercise on 06/30/2026. It names Fidelity Brokerage Services LLC as the broker and indicates Cash as the consideration method in the excerpt.

Who is listed as the broker in the STTK filing?

The filing lists Fidelity Brokerage Services LLC, 900 Salem Street, Smithfield RI as the broker. That broker entry appears alongside numeric fields including 23365 in the provided excerpt.

Does the excerpt show how many shares are proposed for sale?

The excerpt includes the numeric value 23365 next to the Common security line. The filing fragment does not explicitly label that number as "shares offered" within the provided text.

What transaction method is specified in the STTK excerpt?

The excerpt specifies Stock Option Exercise as the transaction type and lists Cash as the method of payment. The transaction date shown is 06/30/2026.

Will Form 144 alone confirm that the sale occurred?

Form 144 notifies the market of an intended sale under Rule 144; it does not confirm completion. Confirmation requires a subsequent trade report or the seller's Form 4/Form 5 that records the executed transaction details.

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

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Accepted by SEC EDGAR 06/30/2026 - 04:10 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001923377
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Shattuck Labs, Inc.
SEC File Number	001-39593
Address of Issuer	500 W. 5TH STREET AUSTIN TEXAS 78701
Phone	512-900-4690
Name of Person for Whose Account the Securities are To Be Sold	Shukla Abhinav A.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	23365	165469.29	76680517	06/30/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	06/30/2026	Stock Option Exercise	Issuer			23365	06/30/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Abhinav A. Shukla 500 W. 5th Street Suite 1200 Austin TX 78701	Common	05/12/2026	2032	14235.58

144: Remarks and Signature

Remarks
Date of Notice	06/30/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/02/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Abhinav A. Shukla
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)