CAMECO CORP (CCJ) Form 6-K — May 28, 2026

Cameco announced that its McArthur River mine and Key Lake mill have returned to full production activities following a disruption caused by flooding in northern Saskatchewan. The disruption was triggered by the partial collapse of the Smoothstone River Bridge, which serves as the primary supply route, forcing the company to rely on secondary routes with weight restrictions. The company confirmed that its 2026 consolidated production outlook remains unchanged at 19.5 million to 21.5 million pounds of U3O8. While the primary supply route is not yet fully restored, Cameco has established consistent delivery of critical materials via secondary routes to maintain operations.

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