X0202 SCHEDULE 13D/A 0002093136 XXXXXXXX LIVE 2 Common Shares, no par value 03/31/2026 0001790169 98956L101 ZeroStack Corp.

40 King Street W., Suite 2400 Toronto A6 M5H 3Y2

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 471208 0 471208 0 471208 10.0 IN Y Zero Gravity Labs Inc. OO DE 0 0 0 0 0 0 CO Common Shares, no par value ZeroStack Corp. 40 King Street W., Suite 2400 Toronto A6 M5H 3Y2 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 On March 31, 2026, the Issuer entered into a note settlement agreement (the "Note Settlement Agreement") with 0G pursuant to which the convertible promissory 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, 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. 471,208 common shares; 10.0% i) 471,208 total sole voting and dispositive authority; 0 total shared voting and dispostive authority; Total Shares: 471,2088; Percentage - 10.0% ii) 0 sole voting and dispositive authority: 0 shared voting and dispositive authority; Total Shares: 0; Percentage - 0% See Item 4 Not applicable Not applicable Note Settlement Agreement by and between ZeroStack Corp. and Zero Gravity Labs, Inc. dated March 31, 2026 Exhibit 1 - Note Settlement Agreement by and between ZeroStack Corp. and Zero Gravity Labs, Inc. dated March 31, 2026 (incorporated by reference to Exhibit 10.3 to the Issuer's 8-K filed with the SEC on March 31, 2026) Exhibit 99.1 - Joint Filing Agreement dated April 2, 2026 Heinrich Michael Michael Heinrich 04/02/2026 Zero Gravity Labs Inc. Michael Heinrich 04/02/2026