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Shattuck Labs (NASDAQ: STTK) CTO exercises 5,122 warrants and increases share holdings

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Shattuck Labs, Inc. Chief Technical Officer Abhinav A. Shukla reported routine equity transactions involving company stock. He received a grant or award of 5,122 shares of common stock at $1.0846 per share, increasing his direct holdings to 86,380 shares.

On the same date, he exercised warrants covering 5,122 shares of common stock at an exercise price of $1.0846 per share, eliminating this warrant position. Footnotes explain these warrants and shares stemmed from a prior private placement that included common stock and accompanying warrants issued under a securities purchase agreement.

Positive

  • None.

Negative

  • None.
Insider Shukla Abhinav A.
Role Chief Technical Officer
Type Security Shares Price Value
Exercise Warrants (Right to Buy) 5,122 $0.00 --
Grant/Award Common Stock 5,122 $1.0846 $6K
Holdings After Transaction: Warrants (Right to Buy) — 0 shares (Direct, null); Common Stock — 86,380 shares (Direct, null)
Footnotes (1)
  1. On August 4, 2025, the Issuer entered into a securities purchase agreement (the "Purchase Agreement") with certain accredited investors, including the Reporting Person. Pursuant to the terms of the Purchase Agreement, the Issuer in a private placement, which closed on August 25, 2025, issued and sold to the Reporting Person 5,122 shares of the Issuer's common stock and accompanying warrants (the "Warrants") to purchase up to an aggregate of 5,122 shares of the Issuer's common stock at a combined price per share and accompanying Warrant of $0.8677. The Warrants are exercisable at any time on or after the original issuance date until the 30th day following the date on which the data from the single ascending dose and multiple ascending dose portions of the Issuer's Phase 1 clinical trial of SL-325, including receptor occupancy and safety data, and the design of the planned Phase 2 clinical trial(s) have been announced publicly.
Common stock grant 5,122 shares Grant or award of common stock on May 21, 2026
Grant price $1.0846 per share Price for 5,122 granted common shares
Warrants exercised 5,122 warrants Exercise of warrants into 5,122 common shares
Warrant exercise price $1.0846 per share Exercise or conversion price for warrants
Shares owned after 86,380 shares Direct common stock holdings following transactions
Private placement unit price $0.8677 per unit Combined price per common share and accompanying warrant
Underlying warrant shares 5,122 shares Common shares underlying the exercised warrants
securities purchase agreement financial
"the Issuer entered into a securities purchase agreement (the "Purchase Agreement") with certain accredited investors"
A securities purchase agreement is a written contract between a buyer and a seller outlining the terms for buying or selling financial assets such as stocks or bonds. It specifies details like the price, quantity, and conditions of the transaction, similar to a shopping list with agreed-upon terms. For investors, it provides clarity and legal protection when transferring ownership of these financial instruments.
private placement financial
"the Issuer in a private placement, which closed on August 25, 2025, issued and sold"
A private placement is a way for companies to raise money by selling securities directly to a small group of investors instead of through a public offering. This process is often quicker and less regulated, making it similar to offering a special, exclusive investment opportunity to select individuals or institutions. For investors, it can provide access to unique investment options that are not available on public markets.
accompanying warrants financial
"issued and sold to the Reporting Person 5,122 shares of the Issuer's common stock and accompanying warrants"
Phase 1 clinical trial technical
"the Issuer's Phase 1 clinical trial of SL-325, including receptor occupancy and safety data"
A phase 1 clinical trial is the first stage of testing a new drug or treatment in people, typically involving a small group to assess safety, how the body handles the treatment, and appropriate dosing. For investors, phase 1 results are an early risk check — like a test drive that can reveal fatal flaws or promising signals — and they often cause big changes in a drug’s perceived value and the company’s prospects.
Phase 2 clinical trial(s) technical
"and the design of the planned Phase 2 clinical trial(s) have been announced publicly"
SEC Form 4
FORM 4UNITED 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*
Shukla Abhinav A.

(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Technical Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock05/21/2026A5,122A$1.084686,380D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Warrants (Right to Buy)$1.084605/21/2026M5,122 (2) (2)Common Stock5,122(1)0D
Explanation of Responses:
1. On August 4, 2025, the Issuer entered into a securities purchase agreement (the "Purchase Agreement") with certain accredited investors, including the Reporting Person. Pursuant to the terms of the Purchase Agreement, the Issuer in a private placement, which closed on August 25, 2025, issued and sold to the Reporting Person 5,122 shares of the Issuer's common stock and accompanying warrants (the "Warrants") to purchase up to an aggregate of 5,122 shares of the Issuer's common stock at a combined price per share and accompanying Warrant of $0.8677.
2. The Warrants are exercisable at any time on or after the original issuance date until the 30th day following the date on which the data from the single ascending dose and multiple ascending dose portions of the Issuer's Phase 1 clinical trial of SL-325, including receptor occupancy and safety data, and the design of the planned Phase 2 clinical trial(s) have been announced publicly.
/s/ Andrew R. Neill, Attorney-in-fact for Abhinav A. Shukla05/21/2026
** Signature of Reporting PersonDate
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)

FAQ

What insider transactions did STTK executive Abhinav Shukla report?

Abhinav A. Shukla reported receiving 5,122 shares of Shattuck Labs common stock and exercising warrants for 5,122 underlying shares. These actions increased his direct common stock holdings and removed the related warrant position, reflecting compensation and warrant exercise activity rather than open-market trading.

How many STTK shares does Abhinav Shukla hold after this Form 4?

After these transactions, Abhinav A. Shukla directly holds 86,380 shares of Shattuck Labs common stock. This figure reflects his position following the 5,122-share grant and the exercise of warrants for 5,122 underlying shares, with the exercised warrants no longer outstanding.

Were the STTK transactions open-market buys or sells?

No open-market buys or sells were reported. The filing shows a grant or award of 5,122 common shares and the exercise of warrants for 5,122 underlying shares. Both are classified as acquisition and derivative exercise events, not open-market purchases or sales of existing stock.

What is the exercise price of the STTK warrants exercised by Abhinav Shukla?

The warrants exercised by Abhinav A. Shukla had an exercise price of $1.0846 per share for 5,122 underlying common shares. These warrants originated from a prior private placement that paired common stock with accompanying warrants sold under a securities purchase agreement.

How were the STTK shares and warrants originally issued to Abhinav Shukla?

The shares and accompanying warrants were originally issued in a private placement under a securities purchase agreement dated August 4, 2025. On closing, he received 5,122 common shares and warrants for 5,122 shares at a combined price of $0.8677 per share and warrant unit.

What does the Form 4 reveal about STTK’s SL-325 clinical trial warrants?

Footnotes state the warrants are exercisable until 30 days after data from single and multiple ascending dose portions of Shattuck’s Phase 1 SL-325 trial, along with Phase 2 design details, have been publicly announced. This links warrant timing to clinical and safety data milestones.