Cameco : Report of Voting Results %282026 05 07%29 0

About this update from Cameco Corporation

May 7, 2026 Canadian Securities Administrators CAMECO CORPORATION Corporate Office 2121 11 th Street West Saskatoon SK S7M 1J3 Canada Tel: +1 (306) 956-6200 https://www.cameco.com Cameco Corporation Annual Meeting May 7, 2026 Report of Voting Results Under National Instrument 51-102 In accordance with Section 11.3 of National Instrument 51-102 - Continuous Disclosure Obligations, we advise of the results of the voting on the matters submitted to the annual meeting (the Meeting) of the shareholders (the Shareholders) of Cameco Corporation (the Corporation) held on May 7, 2026. Each matter voted on is described in greater detail in the Corporation's 2026 Management Proxy Circular issued in connection with this meeting, which is available at cameco.com. The matters voted upon at the Meeting and the results of the voting were as follows: Item 1: Election of Directors The following directors were elected to hold office for the ensuing year or until their successors are elected or appointed: Tammy Cook-Searson Don Kayne Catherine Gignac Peter Kukielski Tim Gitzel Dominique Minière Marie Inkster Leontine van Leeuwen-Atkins Kathryn Jackson The outcome of the ballot vote, both before and after giving effect to the twenty-five (25%) percent non-resident Shareholder voting restriction, was as follows: Vote Results Before Reduction of Non-resident Vote: Nominee Votes For % Votes For Votes Against % Votes Against Tammy Cook-Searson 268,546,019 99.46% 1,445,035 0.54% Catherine Gignac 257,616,122 95.42% 12,374,935 4.58% Tim Gitzel 269,493,993 99.82% 497,067 0.18% Marie Inkster 268,122,805 99.31% 1,868,248 0.69% Kathryn Jackson 267,520,591 99.08% 2,470,465 0.92% Don Kayne 262,615,561 97.27% 7,375,495 2.73% Peter Kukielski 268,828,780 99.57% 1,162,278 0.43% Dominique Minière 266,630,842 98.76% 3,360,213 1.24% Leontine van Leeuwen- Atkins 268,148,177 99.32% 1,842,880 0.68% Vote Results After Reduction of Non-resident Vote to 25%: Nominee Votes For % Votes For Votes Against % Votes Against Tammy Cook-Searson 73,976,654 99.57% 322,919 0.43% Catherine Gignac 72,913,617 98.13% 1,385,967 1.87% Tim Gitzel 74,100,179 99.77% 174,337 0.23% Marie Inkster 73,781,111 99.33% 494,252 0.67% Kathryn Jackson 73,302,463 98.69% 972,353 1.31% Don Kayne 73,311,694 98.81% 882,589 1.19% Peter Kukielski 74,137,072 99.78% 162,508 0.22% Dominique Minière 73,460,367 99.35% 480,348 0.65% Leontine van Leeuwen- Atkins 73,814,853 99.38% 460,340 0.62% Item 2: Appointment of Auditors On a vote by ballot, KPMG LLP was appointed auditors of the Corporation to hold office until the next annual meeting of Shareholders, or until their successors are appointed. The outcome of the ballot vote, both before and after giving effect to the twenty-five (25%) percent non-resident Shareholder voting restriction, was as follows: Vote Results Before Reduction of Non-resident Vote: Votes For % Votes For Votes Withheld % Votes Withheld 272,099,367 90.32% 29,170,316 9.68% Vote Results After Reduction of Non-resident Vote to 25%: Votes For % Votes For Votes Withheld % Votes Withheld 69,559,186 93.17% 5,095,830 6.83% Item 3: Executive Compensation On a vote by ballot, an advisory resolution was passed accepting the approach to executive compensation disclosed in Cameco's Management Proxy Circular delivered in advance of this meeting. The outcome of the ballot vote, both before and after giving effect to the twenty-five (25%) percent non-resident Shareholder voting restriction, was as follows: Vote Results Before Reduction of Non-resident Vote: Votes For % Votes For Votes Against % Votes Against 265,970,208 97.07% 8,038,777 2.93% Vote Results After Reduction of Non-resident Vote to 25%: Votes For % Votes For Votes Against % Votes Against 73,630,638 98.63% 1,024,378 1.37% Cameco Corporation By: "Jenny L. Hoffman" Jenny L. Hoffman Corporate Secretary

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