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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

X0202 SCHEDULE 13D/A 0002089970 XXXXXXXX LIVE 2 Common Shares, no par value 07/20/2026 false 0001790169 98956L1O1 ZeroStack Corp. 2626 Cole Avenue, Suite 300 Dallas TX 75204 Daniel Reis-Faria (954) 842-4989 c/o 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 0002089970 N Reis-Faria Daniel PF X1 6925951 0 6925951 0 6925951 N 37.5 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. Common Shares, no par value ZeroStack Corp. 2626 Cole Avenue, Suite 300 Dallas TX 75204 Daniel Reis-Faria 2626 Cole Avenue, Suite 300 Dallas, Texas 75204 Chief Executive Officer of Issuer The Reporting Person has not, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors). The Reporting Person has 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. Canadian PF and OO On May 5, 2026, the board of directors of the Issuer approved a grant of 500,000 options to the Reporting Person (the "May 2026 Option Grant"), subject to shareholder approval. The options are exercisable for shares of common stock of the Issuer at an exercise price of $5.10 per share, and vest in five equal installments subject to the Issuer's common stock meeting the following volume weighted average price ("VWAP") thresholds: 20% following VWAP of $7.65; 20% following VWAP of $10.20; 20% following VWAP of $12.75; 20% following VWAP of $15.30; and 20% following VWAP of $17.85. On July 20, 2026, the shareholders approved the May 2026 Option Grant. On July 20, 2026, the Reporting Person exercised pre-funded warrants into 5,954,743 common shares at an exercise price of $0.0001 per share. 37.5% Sole dispositive and voting authority: 6,925,951; Shared dispositive and voting authority: 0; Total: 6,925,951 See Item 4 Not applicable Not applicable Form of Pre-Funded Common Share Purchase Warrant Form of Stock Option Agreement dated May 5, 2026 Exhibit 4.1 to the Issuer's 8-K filed with the Securities and Exchange Commission on March 31, 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 Reis-Faria Daniel Daniel Reis-Faria Reis-Faria Daniel 07/21/2026