SPHERE 3D CORP.

$10,300,000

Common Shares

This prospectus supplement and the accompanying prospectus relate to the issuance and sale of up to $10,300,000 of our common shares, no par value ("common shares"), from time to time through our sales agents, A.G.P./Alliance Global Partners ("A.G.P.") and Maxim Group LLC ("Maxim") (each, a "Sales Agent" and, collectively, the "Sales Agents"). These sales, if any, will be made pursuant to the terms of the Amended and Restated Sales Agreement, dated July 31, 2026 (the "A&R Sales Agreement"), by and among us and the Sales Agents, which amended and restated our Sales Agreement, dated January 3, 2025, with A.G.P. (the "Prior Sales Agreement") to add Maxim as a Sales Agent and otherwise retain all material terms thereof.