SEABRIDGE GOLD INC

COMPLETION AND RETURN OF PROXY

A proxy will not be valid unless the completed, dated and signed proxy is received by Computershare Investor Services Inc., Proxy Department, at 14th Floor, 320 Bay Street, Toronto, Ontario M5H 4A6 by 10:00 a.m. Eastern Time on May 20, 2026 or if the Meeting is adjourned or postponed, not less than 48 hours (excluding Saturdays, Sundays and holidays) before the date to which the Meeting is adjourned or postponed. Telephone voting can be completed at 1-866-732-8683, voting by fax can be sent to 1-866-249-7775 or 416-263-9524 and Internet voting can be completed atwww.investorvote.com.

Late proxies may be accepted or rejected by the Chairman of the Meeting at their discretion and the Chairman of the Meeting is under no obligation to accept or reject any particular late proxy. The Chairman of the Meeting may waive or extend the proxy cut-off without notice.