Michael Heinrich - 31 Mar 2026 Form 4 Insider Report for ZeroStack Corp. (ZSTK)

Reporting relationship: Executive Chairman, Director
Issuer ticker: ZSTK
Reported as of: 31 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Apr 2026, 20:05:02 UTC
Prior SEC filing: 22 Dec 2025
Source filing: View source filing
Reporting owner signature: /s/ Dany Vaiman as attorney-in-fact for Michael Heinrich

Key filing fact

Michael Heinrich filed Form 4 for ZeroStack Corp. (ZSTK) on 02 Apr 2026.

Key facts

This page summarizes Michael Heinrich's Form 4 filing for ZeroStack Corp. (ZSTK).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 02 Apr 2026, 20:05.

Change

Previous filing in this sequence was filed on 22 Dec 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002093136 Primary reporting owner

Heinrich Michael

Relationship: Executive Chairman, Director
Address: C/O ZEROSTACK CORP., 40 KING STREET W., SUITE 2400, TORONTO, ONTARIO, CANADA
Signature: /s/ Dany Vaiman as attorney-in-fact for Michael Heinrich
Signature date: 02 Apr 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ZSTK transaction Derivative

Convertible Promissory Note

Other

Transaction value
Shares: -4,902,220
Change %: -100%
Price
Shares after: 0
Date: 31 Mar 2026
Ownership: Held by Zero Gravity Labs Inc., a corporation owned and controlled by the Reporting Person
Underlying class: Common Shares
Underlying amount: 4,902,220
Exercise price: $33.34
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

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.

Footnote F2

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.