144 0001588386 XXXXXXXX LIVE 0001009001 Cameco Corporation 001-14228 2121 11th Street West Saskatoon A9 S7M 1J3 3063855286 Gitzel Timothy S. Officer Common Shares Solium Financial Inc.

1500, 800 - 6th Avenue SW Calgary A0 T2P 3G3

50000 4499500.00 435407158 12/19/2025 NYSE Common Shares 12/19/2025 Stock Option Exercise Cameco Corporation N 50000 12/19/2025 Cash Y 12/19/2025 Timothy S. Gitzel