Report of Foreign Private Issuer - Seabridge Gold Inc.

This filing is a report of Seabridge Gold Inc., a foreign private issuer, for the month of April 2026. It includes a Letter of Transmittal for common shares, a proxy circular, and a form of proxy related to a proposed arrangement with Valor Gold Corp. The arrangement involves transferring Seabridge's interest in the Courageous Lake gold project to Valor, which will become an independent, publicly traded company. Shareholders will receive Valor shares on a pro-rata basis. The filing also details procedures for U.S. shareholders regarding tax withholding and instructions for completing the Letter of Transmittal. Additionally, it outlines the notice of a special meeting of shareholders to be held on May 22, 2026, to consider and vote on the arrangement resolution and other related matters. The board of directors of Seabridge Gold Inc. unanimously recommends voting in favor of the arrangement.