Michael Heinrich - 20 Jul 2026 Form 4 Insider Report for ZeroStack Corp. (ZSTK)

Reporting relationship: Executive Chairman, Director
Issuer ticker: ZSTK
Reported as of: 20 Jul 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 20 Jul 2026, 18:31:03 UTC
Prior SEC filing: 02 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Dany Vaiman as attorney-in-fact for Michael Heinrich

Filing notes and source

Key filing fact

Michael Heinrich filed Form 4 for ZeroStack Corp. (ZSTK) on 20 Jul 2026.

Key facts

This page summarizes Michael Heinrich's Form 4 filing for ZeroStack Corp. (ZSTK).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 20 Jul 2026, 18:31.

Change

Previous filing in this sequence was filed on 02 Apr 2026.
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., 2626 COLE AVENUE, SUITE 300, DALLAS
Signature: /s/ Dany Vaiman as attorney-in-fact for Michael Heinrich
Signature date: 20 Jul 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ZSTK transaction

Common Shares

Purchase

Transaction value
Shares: +4,608,575
Change %
Price: $0.7549^*
Shares after: 4,608,575
Date: 20 Jul 2026
Ownership: Held by Zero Gravity Labs, Inc.
Footnotes: F1, F2

Reported derivative securities

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

ZSTK transaction Derivative

Employee Stock Option (Right to Buy)

Award

Transaction value
Shares: +500,000
Change %
Price: $0.000000^*
Shares after: 500,000
Date: 20 Jul 2026
Ownership: Direct
Underlying class: Common Shares
Underlying amount: 500,000
Exercise price: $5.10
Footnotes: F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

Purchase price in the form of native blockchain tokens; each token deemed to have a value of US$0.7549.

Footnote F2

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

Footnote F3

The options were approved by the Issuer's board of directors on March 5, 2026, subject to shareholder approval, which occurred on July 20, 2026. The options vest in five equal installments; the vesting of each 20% installment is contingent on the Issuer's volume weighted average price reaching a specified threshold.