X0202 SCHEDULE 13D/A 0002093136 XXXXXXXX LIVE 3 Common Shares, no par value 07/20/2026 0001790169 98956L101 ZeroStack Corp.

2626 Cole Avenue, Suite 300 Dallas TX 75204

Richard Raymer (416) 367-7370 Dorsey & Whitney LLP 66 Wellington St. W., Suite 3400 Toronto A6 M5K 1E6 Michael Heinrich (416) 861-2267 Zero Gravity Labs Inc. 548 Market Street, PMB 33721 San Francisco CA 94104 0002093136 N Heinrich Michael OO X1 5579783 0 5579783 0 5579783 30.2 IN Percentage of class is based on 17,489,828 outstanding Issuer shares as of July 20, 2026, and has been calculated on a partially-diluted basis. Y Zero Gravity Labs Inc. OO DE 0 4608575 0 4608575 4607575 26.4 CO Percentage of class is based on 17,489,828 outstanding Issuer shares as of July 20, 2026. Common Shares, no par value ZeroStack Corp. 2626 Cole Avenue, Suite 300 Dallas TX 75204 i) Michael Heinrich (the "Reporting Person") ii) Zero Gravity Labs Inc., a Delaware corporation owned and controlled by the Reporting Person ("0G") i) and ii) 548 Market Street, PMB 33721, San Francisco, CA 94104 The present occupation of the Reporting Person is Chief Executive Officer of 0G, 548 Market Street, PMB 33721, San Francisco, CA 94104. The Reporting Person is also a director and the Chairman of the Board of the Issuer as of September 20, 2025. The Reporting Person and 0G have not, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors). The Reporting Person and 0G have not, during the last five years, been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction, and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws, or finding any violation with respect to such laws. i) United States ii) Delaware i) and ii) OO . 5,579,783 COMMON SHARES 30.2% i) 5,579,783 total sole voting and dispositive authority; 0 total shared voting and dispositive authority; Total Shares: 5,579,783; Percentage - 30.2% ii) 0 sole voting and dispositive authority: 4,608,575 shared voting and dispositive authority; Total Shares: 4,608,575; Percentage - 26.4% See Item 4 Not applicable Not applicable Joint Filing Agreement dated April 2, 2026 Form of Stock Option Agreement dated May 5, 2026 Exhibit 99.1 to Schedule 13D Amendment 2 filed with the Securities and Exchange Commission on April 2, 2026, is incorporated by reference herein Exhibit 10.1 to the Issuer's 8-K filed with the Securities and Exchange Commission on May 6, 2026, is incorporated by reference herein Heinrich Michael Michael Heinrich 07/21/2026 Zero Gravity Labs Inc. Michael Heinrich 07/21/2026