Cameco IPO Presentation Deck

Westinghouse Operates Globally in Nuclear Services and Technology WWestinghouse Summary Overview Global provider of engineering, maintenance and repair services as well as highly- engineered parts and consumables to the global nuclear power sector • The company operates through three key business segments: - Operating Plant Services ("OPS") - Energy Systems Environmental Services 2021 Financials Revenue by Business Segment (US$) Adjusted EBITDA by Business Segment (US$)¹ Environmental Services, 6% Energy Systems, 13% US$3.3B $3.3B 2021Net Revenue Long-term Customer Relationships Operating Plant Services, 81% Environmental Services, 1% Energy Systems, 25% US$695M 2021Adjusted EBITDA Large-scale Global Operations $695M Operating Plant Services, 73% 21% 2021 Adjusted EBITDA Margin Fuel and Service Provider to Global Nuclear Reactor Fleet Cameco Energizing a clean-air world Large-Scale Global Business Platform ★ Global Headquarters ● Main Operational Sites Fuel Fabrication Facilities 1 Adjusted EBITDA is a non-GAAP measure which does not have a standardized meaning or a consistent basis of calculation under U.S. GAAP and should not be considered in isolation or as a substitute for financial information prepared according to U.S. GAAP. Other companies may calculate this measure differently, so you may not be able to make a direct comparison to similar measures presented by other companies. Adjusted EBITDA Margin is defined as Adjusted EBITDA divided by revenue. A reconciliation of non-GAAP measures to the most comparable financial measure can be found on slide 21. 14

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