Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Heinrich Michael 2. Issuer Name and Ticker or Trading Symbol ZeroStack Corp. [ZSTK] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Executive Chairman (Last) (First) (Middle) C/O ZEROSTACK CORP., 40 KING STREET W., SUITE 2400 3. Date of Earliest Transaction (Month/Day/Year) 03/31/2026 (Street) TORONTO M5H 3Y2 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) 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

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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 Underlying Securities (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 of Derivative Security: 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

Convertible Promissory Note

$33.34

03/31/2026

J(1)

4,902,220

10/23/2025

09/22/2035

Common Shares

4,902,220

(2)

0

I

Held by Zero Gravity Labs Inc., a corporation owned and controlled by the Reporting Person

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Heinrich Michael C/O ZEROSTACK CORP. 40 KING STREET W., SUITE 2400 TORONTO M5H 3Y2	X		Executive Chairman

Signatures

/s/ Dany Vaiman as attorney-in-fact for Michael Heinrich		04/02/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	On March 31, 2026, the Issuer entered into a note settlement agreement (the "Note Settlement Agreement") with Zero Gravity Labs Inc., a Delaware corporation ("0G") pursuant to which the convertible promissory note (the "Note") issued to 0G pursuant to the securities purchase agreement dated September 22, 2025, as amended on October 9, 2025, by and between the Issuer and 0G was settled. The Note Settlement Agreement provides that upon payment by the Issuer to 0G on or before March 31, 2026, of 50,000,000 Tokens (as defined in the Note), the Issuer shall be deemed to have paid the entire Principal (as defined in the Note) and Interest (as defined in the Note) of the Note in full and the Issuer shall have no further obligations under the Note and the Note shall be deemed to be satisfied.
(2)	Represents issuance of convertible promissory note to Zero Gravity Labs Inc., a Delaware corporation owned and controlled by the Reporting Person, in the principal amount of 50,000,000 0G bitcoin tokens.

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