CCJ / Cameco Corporation - SEC-arkivering, Årsberetning, Fuldmagtserklæring

Cameco Corporation
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LEI N4BHALMXL3GMZKCUON55
CIK 1009001
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Cameco Corporation
SEC Filings (Chronological Order)
Denne side giver en komplet, kronologisk liste over SEC-arkiveringer, eksklusive ejerskabsregistreringer, som vi leverer andre steder.
June 3, 2026 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Cameco Corporation (Exact name of registrant as specified in its charter) Canada 1-14228 98-0113090 (State or other jurisdiction of incorpor

SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Cameco Corporation (Exact name of registrant as specified in its charter) Canada 1-14228 98-0113090 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) 2121-11th Street West Saskatoon, Saskatchewan, Canada S7M 1J3

June 3, 2026 EX-2.01.SCH

XBRL TAXONOMY EXTENSION SCHEMA

Cameco Australia [Member] Cameco Corporation [Member] Cigar Lake [Member] Crow Butte Resources [Member] Exploration [Member] Key Lake [Member] McArthur River [Member] Power Resources Inc [Member] Rabbit Lake [Member] AUSTRALIA Australia CANADA Canada -Saskatchewan UNITED STATES United States of America Athabasca Community Trust [Member] English River First Nation [Member] Government of Western Aus

June 3, 2026 EX-2.01

Extractive Sector Transparency Measures Act - Annual Report Reporting Year From: 2025-01-01 To: 2025-12-31 Reporting Entity Name Cameco Corporation Currency of the Report CAD Reporting Entity ESTMA Identification Number E886600 Subsidiary Reporting E

Exhibit 2.01 Extractive Sector Transparency Measures Act - Annual Report Reporting Entity Name Cameco Corporation Reporting Year From 2025-01-01 To: 2025-12-31 Date submitted  2026-05-29 Reporting Entity ESTMA Identification Number  E886600 Other Subsidiaries Included (optional field) Not Consolidated Not Substituted Attestation by Reporting Entity In accordance with the requirements of the ESTMA

June 1, 2026 EX-99.1

Cameco Increases Ownership Stake in Cigar Lake Mine

EX-99.1 Exhibit 99.1 NEWS RELEASE All amounts in Canadian dollars unless specified otherwise www.cameco.com   Saskatoon Saskatchewan Canada Cameco Increases Ownership Stake in Cigar Lake Mine June 1, 2026 Cameco (TSX: CCO; NYSE: CCJ) and Orano Canada Inc. (Orano) have reached agreement with TEPCO Resources Inc. (TEPCO) to acquire TEPCO’s 5% participating interest in the Cigar Lake Joint Venture. U

June 1, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June, 2026 Commission File Number 1-14228 Cam

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June, 2026 Commission File Number 1-14228 Cameco Corporation (Translation of Registrant’s Name into English) 2121-11th Street West Saskatoon, Saskatchewan, Canada S7M 1J3 (Address of Principal Executive Offices) Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

May 28, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May, 2026 Commission File Number 1-14228 Came

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May, 2026 Commission File Number 1-14228 Cameco Corporation (Translation of Registrant’s Name into English) 2121-11th Street West Saskatoon, Saskatchewan, Canada S7M 1J3 (Address of Principal Executive Offices) Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

May 28, 2026 EX-99.1

Cameco Announces McArthur River/Key Lake Operation Resumes Production

EX-99.1 Exhibit 99.1 NEWS RELEASE All amounts in Canadian dollars unless specified otherwise www.cameco.com   Saskatoon Saskatchewan Canada Cameco Announces McArthur River/Key Lake Operation Resumes Production May 27, 2026 Cameco (TSX: CCO; NYSE: CCJ) today announced that the Key Lake mill and McArthur River mine have returned to full production activities following a disruption caused by flooding

May 19, 2026 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Cameco Corporation (Exact name of registrant as specified in its charter) Canada 1-14228 98-0113090 (State or other jurisdiction of incorpor

SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Cameco Corporation (Exact name of registrant as specified in its charter) Canada 1-14228 98-0113090 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) 2121-11th Street West Saskatoon, Saskatchewan, Canada S7M 1J3

May 11, 2026 EX-99.1

Northern Saskatchewan Operations Update

EX-99.1 Exhibit 99.1 NEWS RELEASE All amounts in Canadian dollars unless specified otherwise www.cameco.com Saskatoon Saskatchewan Canada Northern Saskatchewan Operations Update May 10, 2026 Cameco (TSX: CCO; NYSE: CCJ) today provided an operational update for our northern Saskatchewan sites amidst flooding in the region, which is impacting roadways. Our northern Saskatchewan sites are not directl

May 11, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May, 2026 Commission File Number 1-14228 Came

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May, 2026 Commission File Number 1-14228 Cameco Corporation (Translation of Registrant’s Name into English) 2121-11th Street West Saskatoon, Saskatchewan, Canada S7M 1J3 (Address of Principal Executive Offices) Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

May 8, 2026 EX-99.2

May 7, 2026 CAMECO CORPORATION Corporate Office 2121 11th Street West Saskatoon SK S7M 1J3 Canadian Securities Administrators Canada Cameco Corporation Annual Meeting May 7, 2026 Report of Voting Results Under National Instrument 51-102 Tel: +1 (306)

EX-99.2 Exhibit 99.2 May 7, 2026 CAMECO CORPORATION Corporate Office 2121 11th Street West Saskatoon SK S7M 1J3 Canadian Securities Administrators Canada Cameco Corporation Annual Meeting May 7, 2026 Report of Voting Results Under National Instrument 51-102 Tel: +1 (306) 956-6200 www.cameco.com In accordance with Section 11.3 of National Instrument 51-102 – Continuous Disclosure Obligations, we ad

May 8, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May, 2026 Commission File Number 1-14228 Came

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May, 2026 Commission File Number 1-14228 Cameco Corporation (Translation of Registrant’s Name into English) 2121-11th Street West Saskatoon, Saskatchewan, Canada S7M 1J3 (Address of Principal Executive Offices) Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

May 8, 2026 EX-99.1

Cameco Announces Election of Directors

EX-99.1 Exhibit 99.1 NEWS RELEASE www.cameco.com Saskatoon Saskatchewan All amounts in Canadian dollars unless specified otherwise Canada Cameco Announces Election of Directors May 7, 2026 Cameco (TSX: CCO; NYSE: CCJ) has announced the election of nine board members at its annual meeting held on May 7, 2026. Shareholders elected board members Tammy Cook-Searson, Catherine Gignac, Tim Gitzel, Marie

May 5, 2026 EX-99.1

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EX-99.1 Exhibit 99.1 NEWS RELEASE www.cameco.com Saskatoon Saskatchewan All amounts in Canadian dollars Canada unless specified otherwise Cameco reports first quarter 2026 results: financial results and operational execution reflect disciplined strategy; annual guidance unchanged; nuclear energy on track for long-term growth in support of global demand May 5, 2026 Cameco (TSX: CCO; NYSE: CCJ) toda

May 5, 2026 EX-99.3

2

EX-99.3 Exhibit 99.3 Cameco Corporation 2026 condensed consolidated interim financial statements (unaudited) May 4, 2026 Cameco Corporation Consolidated statements of earnings (Unaudited) Three months ended ($Cdn thousands, except per share amounts) Note Mar 31/26 Mar 31/25 Revenue from products and services 11 $ 845,365 $ 789,432 Cost of products and services sold 476,684 458,693 Depreciation and

May 5, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of May, 2026 Cameco Corporation (Commission file

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of May, 2026 Cameco Corporation (Commission file No.

May 5, 2026 EX-99.4

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-99.4 Exhibit 99.4 Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Tim Gitzel, chief executive officer of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the state

May 5, 2026 EX-99.2

Management’s discussion and analysis

EX-99.2 Exhibit 99.2 Management’s discussion and analysis for the quarter ended March 31, 2026 7 FIRST QUARTER MARKET UPDATE 11 OUR STRATEGY 13 CONSOLIDATED FINANCIAL RESULTS 17 OUTLOOK FOR 2026 22 LIQUIDITY AND CAPITAL RESOURCES 24 FINANCIAL RESULTS BY SEGMENT 28 OUR OPERATIONS - FIRST QUARTER UPDATES 29 QUALIFIED PERSONS 30 NON-IFRS MEASURES 34 ADDITIONAL INFORMATION This management’s discussion

May 5, 2026 EX-99.5

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-99.5 Exhibit 99.5 Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Heidi Shockey, senior vice-president and chief financial officer, of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fa

April 2, 2026 EX-99.3

   

EX-99.3 Exhibit 99.3 Powering a secure energy future 2026 Management Proxy Circular Notice of Annual Meeting of Shareholders May 7, 2026 About Cameco Cameco is one of the largest global providers of the uranium fuel needed to power a secure energy future. Our competitive position is based on our controlling ownership of the world’s largest high-grade uranium reserves and low-cost operations, as we

April 2, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2026 Cameco Corporation (Commission fi

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2026 Cameco Corporation (Commission file No.

April 2, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2026 Cameco Corporation (Commission fi

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2026 Cameco Corporation (Commission file No.

April 2, 2026 EX-99.1

Notice of our 2026 annual meeting

EX-99.1 Exhibit 99.1     Notice of our 2026 annual meeting of shareholders When Thursday, May 7, 2026 10:00 a.m. CST Via live webcast from Saskatoon, SK https://meetings.lumiconnect.com/400-707-444-004 password: cameco2026 (case sensitive) Your vote is important If you held Cameco common shares on March 9, 2026 (the record date), you are entitled to receive notice of and to vote at this meeting. Y

April 2, 2026 EX-99.1

CAMECO 2025 ANNUAL REPORT

MINING & MILLING Once an orebody is discovered and defined by exploration, there are three common ways to mine uranium, depending on the depth of the orebody and the deposit’s geological characteristics: Ɣ Open pit mining is used if the ore is near the surface.

April 2, 2026 EX-99.4

Cameco Computershare 320 Bay Street, 14th Floor Toronto, ON M5H 4A6 www.computershare.com Security Class Holder Account Number Fold Form of Proxy - Annual Meeting to be held on Thursday, May 7, 2026 This Form of Proxy is solicited by and on behalf of

EX-99.4 Exhibit 99.4 Cameco Computershare 320 Bay Street, 14th Floor Toronto, ON M5H 4A6 www.computershare.com Security Class Holder Account Number Fold Form of Proxy - Annual Meeting to be held on Thursday, May 7, 2026 This Form of Proxy is solicited by and on behalf of Management. Notes to proxy 1. Every holder has the right to appoint some other person or company of their choice, who need not b

April 2, 2026 EX-99.1

Cameco Corporation

EX-99.1 Exhibit 99.1 Cameco Corporation 2025 Modern Slavery Report For financial year ended December 31, 2025. Introduction Overview This Modern Slavery Report has been produced in accordance with the Fighting Against Forced Labour and Child Labour in Supply Chains Act (the Act). It pertains to the financial year ended December 31, 2025 and is the joint report of Cameco Corporation and its wholly

April 2, 2026 EX-99.2

Notice and Access Notification to Shareholders

EX-99.2 Exhibit 99.2   Notice and Access Notification to Shareholders Notice of 2026 Annual Meeting of Shareholders and Notice of Availability of Meeting Materials  Annual Meeting of Shareholders of Cameco Corporation will be held:  When: Thursday, May 7, 2026 Via live audio webcast from Saskatoon, SK at 10:00 a.m. (Saskatoon time) https://meetings.lumiconnect.com/400-707-444-004 (password cameco2

April 2, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2026 Cameco Corporation (Commission fi

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2026 Cameco Corporation (Commission file No.

March 19, 2026 EX-99.14

CONSENT OF EXPERT

EX-99.14 EXHIBIT 99.14 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of

March 19, 2026 EX-99.11

CONSENT OF EXPERT

EX-99.11 EXHIBIT 99.11 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of

March 19, 2026 EX-99.3

PROVEN AND PROBABLE (P&P) RESERVES, MEASURED AND INDICATED (M&I) RESOURCES, INFERRED RESOURCES (SHOWING CHANGE FROM 2024) at December 31, 2025

EX-99.3 Exhibit 99.3 Management’s discussion and analysis February 13, 2026 10 MARKET OVERVIEW AND DEVELOPMENTS 17 2025 PERFORMANCE HIGHLIGHTS 22 OUR VALUES AND STRATEGY 32 OUR SUSTAINABILITY PRINCIPLES AND PRACTICES 35 MEASURING OUR RESULTS 37 FINANCIAL RESULTS 74 OPERATIONS AND PROJECTS 107 MINERAL RESERVES AND RESOURCES 112 ADDITIONAL INFORMATION This management’s discussion and analysis (MD&A)

March 19, 2026 EX-99.6

CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

EX-99.6 EXHIBIT 99.6 CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED I, Tim Gitzel, certify that: 1. I have reviewed this Annual Report on Form 40-F of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made,

March 19, 2026 EX-99.4

For fiscal years ended December 31, 2025 and December 31, 2024, KPMG LLP and its affiliates billed Cameco Corporation and its subsidiaries the following fees:

EX-99.4 EXHIBIT 99.4 For fiscal years ended December 31, 2025 and December 31, 2024, KPMG LLP and its affiliates billed Cameco Corporation and its subsidiaries the following fees: 2025 ($) % of total fees 2024 ($) % of total fees Audit fees Cameco1,8 3,005,100 79.1 3,268,600 76.0 Other statutory2,8 461,500 12.2 467,700 10.9 Securities engagement3 97,000 2.6 217,900 5.1 Total audit fees 3,563,600 9

March 19, 2026 EX-99.7

CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

EX-99.7 EXHIBIT 99.7 CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED I, Heidi Shockey, certify that: 1. I have reviewed this Annual Report on Form 40-F of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements ma

March 19, 2026 EX-99.2

Cameco Corporation

1 EXHIBIT 99.2 Cameco Corporation 2025 Consolidated Audited Financial Statements February 12, 2026 2 Cameco Corporation 2025 consolidated financial statements February 12, 2026 3 Report of management’s accountability The accompanying consolidated financial statements have been prepared by management in accordance with International Financial Reporting Standards as issued by the International Accou

March 19, 2026 EX-99.10

CONSENT OF EXPERT

EX-99.10 EXHIBIT 99.10 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of

March 19, 2026 EX-99.13

CONSENT OF EXPERT

EX-99.13 EXHIBIT 99.13 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of

March 19, 2026 EX-99.16

CONSENT OF EXPERT

EX-99.16 EXHIBIT 99.16 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of

March 19, 2026 EX-99.8

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

EX-99.8 EXHIBIT 99.8 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of Cameco Corporation (the “Company”) on Form 40-F for the year ended December 31, 2025, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Tim Gitzel, Chief Executive Officer of

March 19, 2026 EX-99.5

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

EX-99.5 EXHIBIT 99.5 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM The Board of Directors Cameco Corporation We consent to the use of: • our report dated February 12, 2026 on the consolidated financial statements of Cameco Corporation (the “Entity”) which comprise the consolidated statements of financial position as of December 31, 2025 and 2024, the related consolidated statements of e

March 19, 2026 EX-99.12

CONSENT OF EXPERT

EX-99.12 EXHIBIT 99.12 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of

March 19, 2026 EX-99.9

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

EX-99.9 EXHIBIT 99.9 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of Cameco Corporation (the “Company”) on Form 40-F for the year ended December 31, 2025, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Heidi Shockey, Senior Vice-President an

March 19, 2026 40-F

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 40-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13(a) or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 Commission file number : 1-14228 CAMECO CORPORATION (Exact name of Registrant as specified in

March 19, 2026 EX-99.1

Cameco Corporation 2025 Annual Information Form March 19, 2026

EX-99.1 EXHIBIT 99.1 Cameco Corporation 2025 Annual Information Form March 19, 2026 Cameco Corporation 2025 Annual information form March 19, 2026 2025 ANNUAL INFORMATION FORM Page 1 Contents Important information about this document 3 Our business 9 Our values and strategy 14 Operations, projects and investments 29 Uranium – Tier-one operations 30 Uranium – Tier-two operations 80 Uranium – Advanc

March 19, 2026 EX-99.15

CONSENT OF EXPERT

EX-99.15 EXHIBIT 99.15 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of

March 2, 2026 EX-99.1

Cameco Signs Long-Term Uranium Supply Agreement with India

EX-99.1 Exhibit 99.1 NEWS RELEASE www.cameco.com Saskatoon Saskatchewan Canada All amounts in Canadian dollars unless specified otherwise Cameco Signs Long-Term Uranium Supply Agreement with India March 2, 2026 Cameco (TSX: CCO; NYSE: CCJ) has entered a long-term agreement to supply uranium ore concentrate (U3O8) to the Government of India’s Department of Atomic Energy, for use in the country’s fl

March 2, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of March, 2026 Cameco Corporation (Commission fi

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of March, 2026 Cameco Corporation (Commission file No.

February 13, 2026 EX-99.9

CONSENT OF EXPERT

EX-99.9 Exhibit 99.9 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation o

February 13, 2026 EX-99.1

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EX-99.1 Exhibit 99.1 NEWS RELEASE All amounts in Canadian dollars unless specified otherwise Saskatoon Saskatchewan Canada Cameco announces 2025 results; solid fourth quarter and 2025 performance; increasing long-term uranium market activity reinforces constructive outlook; disciplined supply strategy expected to position company to unlock value from growing demand February 13, 2026 Cameco (TSX: C

February 13, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of February, 2026 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of February, 2026 Cameco Corporation (Commission file No.

February 13, 2026 EX-99.2

Cameco Corporation

EX-99.2 Exhibit 99.2 Cameco Corporation 2025 consolidated financial statements February 12, 2026 2025 CONSOLIDATED FINANCIAL STATEMENTS AND NOTES 1 Report of management’s accountability The accompanying consolidated financial statements have been prepared by management in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board. Manageme

February 13, 2026 EX-99.5

CONSENT OF EXPERT

EX-99.5 Exhibit 99.5 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation o

February 13, 2026 EX-99.3

PROVEN AND PROBABLE (P&P) RESERVES, MEASURED AND INDICATED (M&I) RESOURCES, INFERRED RESOURCES (SHOWING CHANGE FROM 2024) at December 31, 2025

EX-99.3 Exhibit 99.3 Management’s discussion and analysis February 13, 2026 10 MARKET OVERVIEW AND DEVELOPMENTS 17 2025 PERFORMANCE HIGHLIGHTS 22 OUR VALUES AND STRATEGY 32 OUR SUSTAINABILITY PRINCIPLES AND PRACTICES 35 MEASURING OUR RESULTS 37 FINANCIAL RESULTS 74 OPERATIONS AND PROJECTS 107 MINERAL RESERVES AND RESOURCES 112 ADDITIONAL INFORMATION This management’s discussion and analysis (MD&A)

February 13, 2026 EX-99.8

CONSENT OF EXPERT

EX-99.8 Exhibit 99.8 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation o

February 13, 2026 EX-99.7

CONSENT OF EXPERT

EX-99.7 Exhibit 99.7 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation o

February 13, 2026 EX-99.6

CONSENT OF EXPERT

EX-99.6 Exhibit 99.6 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation o

February 13, 2026 EX-99.11

CONSENT OF EXPERT

EX-99.11 Exhibit 99.11 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation

February 13, 2026 EX-99.4

Consent of Independent Registered Public Accounting Firm

EX-99.4 Exhibit 99.4 Consent of Independent Registered Public Accounting Firm The Board of Directors Cameco Corporation We consent to the incorporation by reference in the Registration Statements on Form S-8 (File Nos. 333-11736, 333-06180, 333-139165, 333-196422 and 333-281406) and the Registration Statement on Form F-10 (File No. 333-283140) of our reports dated February 12, 2026 with respect to

February 13, 2026 EX-99.10

CONSENT OF EXPERT

EX-99.10 Exhibit 99.10 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation

January 23, 2026 EX-99.14

Ethics and U CODE OF CONDUCT AND ETHICS Safety and Environment | People | Integrity | Excellence

EX-99.14 Exhibit 99.14 Ethics and U CODE OF CONDUCT AND ETHICS Safety and Environment | People | Integrity | Excellence Our Responsibilities | Our Conduct: | Administration | Management Documents | Contacts under the law of this Code Referenced in the Code within Cameco within the community with shareholders & the public with customers, partners, contractors, suppliers & competitors “Our dedicatio

January 23, 2026 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2026 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2026 Cameco Corporation (Commission file No.

November 5, 2025 EX-99.1

- 1 -

EX-99.1 Exhibit 99.1 NEWS RELEASE www.cameco.com Saskatoon All amounts in Canadian dollars unless specified otherwise Saskatchewan Canada Cameco announces third quarter results: financial performance on track for strong finish to the year; nuclear fundamentals strengthened by transformational partnership to deploy Westinghouse reactors in the US; annual dividend declared November 5, 2025 Cameco (T

November 5, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of November, 2025 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of November, 2025 Cameco Corporation (Commission file No.

November 5, 2025 EX-99.3

Cameco Corporation

EX-99.3 Exhibit 99.3 Cameco Corporation 2025 condensed consolidated interim financial statements (unaudited) November 4, 2025 Cameco Corporation Consolidated statements of earnings (Unaudited) Three months ended Nine months ended ($Cdn thousands, except per share amounts) Note Sep 30/25 Sep 30/24 Sep 30/25 Sep 30/24 Revenue from products and services 11 $ 614,555 $ 720,596 $ 2,281,003 $ 1,952,599

November 5, 2025 EX-99.2

Management’s discussion and analysis

EX-99.2 Exhibit 99.2 Management’s discussion and analysis for the quarter ended September 30, 2025 7 THIRD QUARTER MARKET UPDATE 11 OUR STRATEGY 14 CONSOLIDATED FINANCIAL RESULTS 18 OUTLOOK FOR 2025 23 LIQUIDITY AND CAPITAL RESOURCES 26 FINANCIAL RESULTS BY SEGMENT 31 OUR OPERATIONS - THIRD QUARTER UPDATES 33 QUALIFIED PERSONS 34 NON-IFRS MEASURES 40 ADDITIONAL INFORMATION This management’s discus

November 5, 2025 EX-99.5

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-99.5 Exhibit 99.5 Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Heidi Shockey, senior vice-president and chief financial officer, of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fa

November 5, 2025 EX-99.4

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-99.4 Exhibit 99.4 Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Tim Gitzel, chief executive officer of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the state

October 31, 2025 EX-99.1

FORM 51-102F3 MATERIAL CHANGE REPORT

EX-99.1 Exhibit 99.1 FORM 51-102F3 MATERIAL CHANGE REPORT Item 1 – Name and Address of Company Cameco Corporation (“Cameco”) 2121 – 11th Street West Saskatoon, Saskatchewan S7M 1J3 Item 2 – Date of Material Change October 28, 2025 Item 3 – News Release The news release relating to the material change described in this report was issued by Cameco via Business Wire on October 28, 2025. A copy of the

October 31, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of October, 2025 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of October, 2025 Cameco Corporation (Commission file No.

October 31, 2025 EX-99.2

TERM SHEET TERM SHEET This term sheet (Term Sheet) dated October 28, 2025 sets forth the details regarding the terms of the strategic partnership (the Strategic Partnership) among Brookfield Renewable Power Inc., Cameco U.S. Holdings, Inc. and Cameco

EX-99.2 Exhibit 99.2 TERM SHEET TERM SHEET This term sheet (Term Sheet) dated October 28, 2025 sets forth the details regarding the terms of the strategic partnership (the Strategic Partnership) among Brookfield Renewable Power Inc., Cameco U.S. Holdings, Inc. and Cameco Corporation (collectively, the Current Owners), the United States Department of Commerce (USG) (each, a Partner) and Westinghous

October 28, 2025 EX-99.2

1

EX-99.2 Exhibit 99.2 Brookfield United States Government, Brookfield and Cameco announce transformational partnership to deliver long-term value using Westinghouse nuclear reactor technology • At least $80 billion to construct new Westinghouse nuclear power reactors • Partnership will accelerate nuclear power and artificial intelligence deployment in America All values are USD Tokyo & Cranberry, P

October 28, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of October, 2025 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of October, 2025 Cameco Corporation (Commission file No.

October 28, 2025 EX-99.1

Cameco and Brookfield establish transformational partnership with United States Government to accelerate deployment of Westinghouse nuclear reactors

EX-99.1 Exhibit 99.1 NEWS RELEASE www.cameco.com Saskatoon Saskatchewan All amounts in Canadian dollars Canada unless specified otherwise Cameco and Brookfield establish transformational partnership with United States Government to accelerate deployment of Westinghouse nuclear reactors October 28, 2025 Cameco Corporation (TSX: CCO; NYSE: CCJ) today announced that it, along with Brookfield Asset Ma

September 17, 2025 144

144

144 0001979747 XXXXXXXX LIVE 0001009001 Cameco Corp 001-14228 2121 11th Street West Saskatoon A9 S7M 1J3 3063855286 Shockey Heidi Officer Common Shares Solium Financial Inc. 1500, 800 - 6th Avenue SW Calgary A0 T2P 3G3 19460 1680000.00 435387448 09/15/2025 NYSE Common Shares 09/15/2025 Stock Option Exercise Cameco Corporation N 19460 09/15/2025 Cash Y 09/17/2025 Shockey Heidi

September 15, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of September, 2025 Cameco Corporation (Commissio

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of September, 2025 Cameco Corporation (Commission file No.

September 15, 2025 EX-99.1

Cameco Signs Long-Term UF6 Supply Agreement with Slovenské elektrárne

EX-99.1 Exhibit 99.1 NEWS RELEASE All amounts in Canadian dollars unless specified otherwise www.cameco.com Saskatoon Saskatchewan Canada Cameco Signs Long-Term UF6 Supply Agreement with Slovenské elektrárne September 12, 2025 Cameco (TSX: CCO; NYSE: CCJ) has finalized a new long-term agreement to supply natural uranium hexafluoride (UF6) to Slovenské elektrárne (SE) for use in its nuclear power p

September 10, 2025 144

144

144 0002030590 XXXXXXXX LIVE 0001009001 CAMECO CORP 001-14228 2121 11TH ST W SASKATOON A9 S7M 1J3 3069566200 Girard Rachelle S.

August 28, 2025 EX-99.1

Cameco provides production update; strategically well-positioned for continued long-term value creation

EX-99.1 Exhibit 99.1 NEWS RELEASE www.cameco.com Saskatoon All amounts in Canadian dollars Saskatchewan unless specified otherwise Canada Cameco provides production update; strategically well-positioned for continued long-term value creation August 28, 2025 Cameco (TSX: CCO; NYSE: CCJ) provided an operational update today regarding its 2025 production plans. Development delays in transitioning the

August 28, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of August, 2025 Cameco Corporation (Commission f

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of August, 2025 Cameco Corporation (Commission file No.

July 31, 2025 EX-99.4

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-99.4 Exhibit 99.4 Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Tim Gitzel, president and chief executive officer of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to

July 31, 2025 EX-99.5

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 99.5 Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Grant Isaac, executive vice-president and chief financial officer, of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact nece

July 31, 2025 EX-99.2

Management’s discussion and analysis

EX-99.2 Exhibit 99.2 Management’s discussion and analysis for the quarter ended June 30, 2025 6 SECOND QUARTER MARKET UPDATE 9 OUR STRATEGY 12 CONSOLIDATED FINANCIAL RESULTS 16 OUTLOOK FOR 2025 21 LIQUIDITY AND CAPITAL RESOURCES 24 FINANCIAL RESULTS BY SEGMENT 28 OUR OPERATIONS - SECOND QUARTER UPDATES 30 QUALIFIED PERSONS 30 NON-IFRS MEASURES 36 ADDITIONAL INFORMATION This management’s discussion

July 31, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of July, 2025 Cameco Corporation (Commission fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of July, 2025 Cameco Corporation (Commission file No.

July 31, 2025 EX-99.3

Cameco Corporation

Exhibit 99.3 Cameco Corporation 2025 condensed consolidated interim financial statements (unaudited) July 30, 2025 Cameco Corporation Consolidated statements of earnings (Unaudited) Three months ended Six months ended ($Cdn thousands, except per share amounts) Note Jun 30/25 Jun 30/24 Jun 30/25 Jun 30/24 Revenue from products and services 11 $ 877,016 $ 598,458 $ 1,666,448 $ 1,232,003 Cost of prod

July 31, 2025 EX-99.1

- 1 -

Exhibit 99.1 NEWS RELEASE www.cameco.com Saskatoon All amounts in Canadian dollars unless specified otherwise Saskatchewan Canada Cameco Q2 results: strong financial performance reflecting positive momentum for nuclear power; uranium average realized price benefitting from long-term contracting strategy; Westinghouse opportunities driving improved 2025 outlook July 31, 2025 Cameco (TSX: CCO; NYSE:

June 27, 2025 EX-99.1

Cameco Releases 2024 Sustainability Report

Exhibit 1 NEWS RELEASE www.cameco.com Saskatoon All amounts in Canadian dollars Saskatchewan unless specified otherwise Canada Cameco Releases 2024 Sustainability Report Saskatoon, Saskatchewan, Canada, June 26, 2025 Cameco (TSX: CCO; NYSE: CCJ) released its 2024 Sustainability Report today, which communicates the initiatives and key metrics that demonstrate Cameco’s progress to date and the conti

June 27, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of June, 2025 Cameco Corporation (Commission fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of June, 2025 Cameco Corporation (Commission file No.

June 16, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Cameco Corporation (Exact name of registrant as specified in its charter) Canada 1-14228 98-0113090 (State or other jurisdiction of incorpor

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Cameco Corporation (Exact name of registrant as specified in its charter) Canada 1-14228 98-0113090 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) 2121-11th Street West Saskatoon, Saskatchewan, Canada S7M 1J3 (Ad

June 16, 2025 EX-2.01

Extractive Sector Transparency Measures Act - Annual Report Reporting Year From: 1/1/2024 To: 12/31/2024 Reporting Entity Name Cameco Corporation Currency of the Report CAD Reporting Entity ESTMA Identification Number E886600 Subsidiary Reporting Ent

Exhibit 2.01 Extractive Sector Transparency Measures Act - Annual Report Reporting Entity Name Cameco Corporation Reporting Year From 1/1/2024 To: 12/31/2024 Date submitted  5/30/2025 Reporting Entities May Insert Their Brand/Logo here Reporting Entity ESTMA Identification Number  E886600 Other Subsidiaries Included (optional field) Not Consolidated Not Substituted Attestation by Reporting Entity

June 9, 2025 EX-99.1

Cameco Reports Expected Increase in Its Share of Westinghouse 2025 Adjusted EBITDA

EX-99.1 Exhibit 99.1 NEWS RELEASE www.cameco.com Saskatoon All amounts in Canadian dollars unless specified otherwise Saskatchewan Canada Cameco Reports Expected Increase in Its Share of Westinghouse 2025 Adjusted EBITDA June 06, 2025 Cameco (TSX: CCO; NYSE: CCJ) reports an expected increase of approximately $170 million (US) in our 49% equity share of Westinghouse Electric Company’s (Westinghouse

June 9, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of June, 2025 Cameco Corporation (Commission fil

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of June, 2025 Cameco Corporation (Commission file No.

June 4, 2025 EX-99.1

Northern Saskatchewan Operations Update

EX-99.1 Exhibit 99.1 NEWS RELEASE www.cameco.com Saskatoon Saskatchewan All amounts in Canadian dollars Canada unless specified otherwise Northern Saskatchewan Operations Update June 3, 2025 Cameco (TSX: CCO; NYSE: CCJ) is continuing its operations at its northern Saskatchewan sites amidst wildfires that are impacting parts of the province. Currently, there are no fires in the vicinity of Cameco’s

June 4, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of June, 2025 Cameco Corporation (Commission fil

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of June, 2025 Cameco Corporation (Commission file No.

June 2, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Cameco Corporation (Exact name of registrant as specified in its charter) Canada 1-14228 98-0113090 (State or other jurisdiction of incorpor

SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Cameco Corporation (Exact name of registrant as specified in its charter) Canada 1-14228 98-0113090 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) 2121-11th Street West Saskatoon, Saskatchewan, Canada S7M 1J3

May 12, 2025 EX-99.1

Cameco Announces Election of Directors

Exhibit 99.1 NEWS RELEASE www.cameco.com Saskatoon All amounts in Canadian dollars unless specified otherwise Saskatchewan Canada Cameco Announces Election of Directors May 9, 2025 Cameco (TSX: CCO; NYSE: CCJ) has announced the election of ten board members at its annual meeting held on May 9, 2025. Shareholders elected board members Daniel Camus, Tammy Cook-Searson, Catherine Gignac, Tim Gitzel,

May 12, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of May, 2025 Cameco Corporation (Commission file

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of May, 2025 Cameco Corporation (Commission file No.

May 12, 2025 EX-99.2

CAMECO CORPORATION Corporate Office 2121 – 11th Street West Saskatoon, Saskatchewan Canada S7M 1J3 Tel 306.956.6200 Fax 306.956.6201 www.cameco.com

Exhibit 99.2 CAMECO CORPORATION Corporate Office 2121 – 11th Street West Saskatoon, Saskatchewan Canada S7M 1J3 Tel 306.956.6200 Fax 306.956.6201 www.cameco.com May 9, 2025 Canadian Securities Administrators Cameco Corporation Annual Meeting May 9, 2025 Report of Voting Results Under National Instrument 51-102 In accordance with Section 11.3 of National Instrument 51-102 – Continuous Disclosure Ob

May 1, 2025 EX-99.4

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 99.4 Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Tim Gitzel, president and chief executive officer of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the

May 1, 2025 EX-99.2

Management’s discussion and analysis

Exhibit 99.2 Management’s discussion and analysis for the quarter ended March 31, 2025 6 FIRST QUARTER MARKET UPDATE 9 OUR STRATEGY 11 CONSOLIDATED FINANCIAL RESULTS 15 OUTLOOK FOR 2025 20 LIQUIDITY AND CAPITAL RESOURCES 22 FINANCIAL RESULTS BY SEGMENT 26 OUR OPERATIONS - FIRST QUARTER UPDATES 28 QUALIFIED PERSONS 28 NON-IFRS MEASURES 34 ADDITIONAL INFORMATION This management’s discussion and anal

May 1, 2025 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201

Exhibit 99.1 TSX: CCO website: cameco.com NYSE: CCJ currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco reports Q1 results: strong consolidated financial and operational results; average realized price benefitting from long-term contracting strategy; full-cycle market fundamentals remain positive Saskatoon, Saskat

May 1, 2025 EX-99.3

Cameco Corporation

Exhibit 99.3 Cameco Corporation 2025 condensed consolidated interim financial statements (unaudited) April 30, 2025 Cameco Corporation Consolidated statements of earnings (Unaudited) Three months ended ($Cdn thousands, except per share amounts) Note Mar 31/25 Mar 31/24 Revenue from products and services 11 $ 789,432 $ 633,545 Cost of products and services sold 458,693 403,558 Depreciation and amor

May 1, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of May, 2025 Cameco Corporation (Commission file

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of May, 2025 Cameco Corporation (Commission file No.

May 1, 2025 EX-99.5

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-99.5 Exhibit 99.5 Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Grant Isaac, executive vice-president and chief financial officer, of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material f

April 3, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2025 Cameco Corporation (Commission fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2025 Cameco Corporation (Commission file No.

April 3, 2025 EX-99.1

2

Exhibit 99.1 Cameco Corporation 2024 Modern Slavery Report For financial year ended December 31, 2024. Introduction Overview This Modern Slavery Report has been produced in accordance with the Fighting Against Forced Labour and Child Labour in Supply Chains Act (the Act). It pertains to the financial year ended December 31, 2024 and is the joint report of Cameco Corporation and its wholly owned Ca

April 3, 2025 EX-99.3

[this page intentionally left blank]

Exhibit 99.3 About Cameco Cameco is one of the largest global providers of the uranium fuel needed to power a secure energy future. Our competitive position is based on our controlling ownership of the world’s largest high-grade uranium reserves and low-cost operations, as well as significant investments across the nuclear fuel cycle, including ownership interests in Westinghouse Electric Company

April 3, 2025 EX-99.2

Notice and Access Notification to Shareholders

Exhibit 99.2   Notice and Access Notification to Shareholders Notice of 2025 Annual Meeting of Shareholders and Notice of Availability of Meeting Materials  Annual Meeting of Shareholders of Cameco Corporation will be held:  When: Friday, May 9, 2025 Via live audio webcast from Saskatoon, SK at 10:00 a.m. (Saskatoon time) https://meetings.lumiconnect.com/400-610-583-908 (password cameco2025) Camec

April 3, 2025 EX-99.1

Notice of our 2025 annual meeting

Exhibit 99.1 Notice of our 2025 annual meeting of shareholders When Friday, May 9, 2025 10:00 a.m. CST Via live webcast from Saskatoon, SK https://meetings.lumiconnect.com/400-610-583-908 password: cameco2025 (case sensitive) Your vote is important If you held Cameco common shares on March 10, 2025 (the record date), you are entitled to receive notice of and to vote at this meeting. You can vote i

April 3, 2025 EX-99.4

Appoint a proxyholder — You can appoint Tim Gitzel or Sean Quinn to be your proxyholder, or choose someone else to represent you and vote your shares at the meeting. This person does not have to be a shareholder. You appoint Tim Gitzel, or in his abs

Exhibit 99.4 Appoint a proxyholder — You can appoint Tim Gitzel or Sean Quinn to be your proxyholder, or choose someone else to represent you and vote your shares at the meeting. This person does not have to be a shareholder. You appoint Tim Gitzel, or in his absence, Sean Quinn, You appoint the following person or company to attend the meeting and vote each with full power of substitution. on you

April 3, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2025 Cameco Corporation (Commission fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2025 Cameco Corporation (Commission file No.

April 3, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2025 Cameco Corporation (Commission fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2025 Cameco Corporation (Commission file No.

March 21, 2025 EX-99.13

CONSENT OF EXPERT

EXHIBIT 99.13 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prep

March 21, 2025 EX-99.7

CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

EXHIBIT 99.7 CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED I, Grant Isaac, certify that: 1. I have reviewed this Annual Report on Form 40-F of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in lig

March 21, 2025 EX-99.15

CONSENT OF EXPERT

EXHIBIT 99.15 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prep

March 21, 2025 EX-99.6

CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

EXHIBIT 99.6 CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED I, Tim Gitzel, certify that: 1. I have reviewed this Annual Report on Form 40-F of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in ligh

March 21, 2025 EX-99.11

CONSENT OF EXPERT

EXHIBIT 99.11 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prep

March 21, 2025 EX-99.14

CONSENT OF EXPERT

EXHIBIT 99.14 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prep

March 21, 2025 EX-99.9

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

EXHIBIT 99.9 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of Cameco Corporation (the “Company”) on Form 40-F for the year ended December 31, 2024, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Grant Isaac, Executive Vice-President and Chief

March 21, 2025 EX-99.2

Cameco Corporation

1 EXHIBIT 99.2 Cameco Corporation 2024 Consolidated Audited Financial Statements February 19, 2025 2 Cameco Corporation 2024 consolidated financial statements February 19, 2025 3 Report of management’s accountability The accompanying consolidated financial statements have been prepared by management in accordance with International Financial Reporting Standards as issued by the International Accou

March 21, 2025 EX-99.4

For fiscal years ended December 31, 2024 and December 31, 2023, KPMG LLP and its affiliates billed Cameco Corporation and its subsidiaries the following fees:

EXHIBIT 99.4 For fiscal years ended December 31, 2024 and December 31, 2023, KPMG LLP and its affiliates billed Cameco Corporation and its subsidiaries the following fees: 2024 ($) % of total fees 2023 ($) % of total fees Audit fees Cameco1 3,571,900 83.1 2,436,700 88.7 Subsidiaries2 164,400 3.8 135,600 4.9 Securities engagement3 217,900 5.1 —  —  Total audit fees 3,954,200 92.0 2,572,300 93.6 Aud

March 21, 2025 EX-99.5

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

EXHIBIT 99.5 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM The Board of Directors Cameco Corporation We consent to the use of: • our report dated February 19, 2025 on the consolidated financial statements of Cameco Corporation (the “Entity”) which comprise the consolidated statements of financial position as of December 31, 2024 and 2023, the related consolidated statements of earnings,

March 21, 2025 EX-99.1

Cameco Corporation 2024 Annual Information Form March 21, 2025

EXHIBIT 99.1 Cameco Corporation 2024 Annual Information Form March 21, 2025 Cameco Corporation 2024 Annual information form March 21, 2025 Contents Important information about this document 3 Our business 7 Our values and strategy 13 Operations, projects and investments 28 Uranium – Tier-one operations 29 Uranium – Tier-two operations 79 Uranium – Advanced projects 81 Uranium – Exploration 83 Fuel

March 21, 2025 EX-99.16

CONSENT OF EXPERT

EXHIBIT 99.16 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prep

March 21, 2025 EX-99.10

CONSENT OF EXPERT

EXHIBIT 99.10 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prep

March 21, 2025 EX-99.3

Cameco Corporation 2024 Management’s Discussion and Analysis February 20, 2025

EXHIBIT 99.3 Cameco Corporation 2024 Management’s Discussion and Analysis February 20, 2025 Exhibit 99.3 Management’s discussion and analysis February 20, 2025 10 MARKET OVERVIEW AND DEVELOPMENTS 17 2024 PERFORMANCE HIGHLIGHTS 22 OUR VALUES AND STRATEGY 32 OUR SUSTAINABILITY PRINCIPLES AND PRACTICES 35 MEASURING OUR RESULTS 37 FINANCIAL RESULTS 73 OPERATIONS AND PROJECTS 107 MINERAL RESERVES AND R

March 21, 2025 EX-99.12

CONSENT OF EXPERT

EXHIBIT 99.12 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prep

March 21, 2025 EX-99.8

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

EXHIBIT 99.8 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of Cameco Corporation (the “Company”) on Form 40-F for the year ended December 31, 2024, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Tim Gitzel, President and Chief Executive Offic

March 21, 2025 40-F

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 40-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13(a) or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 Commission file number : 1-14228 CAMECO CORPORATION (Exact name of Registrant as specified in

February 21, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of February, 2025 Cameco Corporation (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of February, 2025 Cameco Corporation (Commission file No.

February 21, 2025 EX-99.3

CONSENT OF EXPERT

Exhibit 99.3 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or su

February 21, 2025 EX-99.5

CONSENT OF EXPERT

Exhibit 99.5 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or su

February 21, 2025 EX-99.1

CONSENT OF EXPERT

Exhibit 99.1 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or su

February 21, 2025 EX-99.4

CONSENT OF EXPERT

Exhibit 99.4 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or su

February 21, 2025 EX-99.7

CONSENT OF EXPERT

Exhibit 99.7 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or su

February 21, 2025 EX-99.6

CONSENT OF EXPERT

Exhibit 99.6 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or su

February 21, 2025 EX-99.2

CONSENT OF EXPERT

Exhibit 99.2 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (File No. 333-283140) (the “Form F-10”) of Cameco Corporation filed with the United States Securities and Exchange Commission pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in the preparation of, or su

February 20, 2025 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201

Exhibit 99.1 TSX: CCO website: cameco.com NYSE: CCJ currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco announces 2024 results; strong performance across all segments; Westinghouse distribution; strategy centered on marketing, production, financial discipline expected to generate full-cycle value; positive outlook

February 20, 2025 EX-99.3

TARGET

Exhibit 99.3 Management’s discussion and analysis February 20, 2025 10 MARKET OVERVIEW AND DEVELOPMENTS 17 2024 PERFORMANCE HIGHLIGHTS 22 OUR VALUES AND STRATEGY 32 OUR SUSTAINABILITY PRINCIPLES AND PRACTICES 35 MEASURING OUR RESULTS 37 FINANCIAL RESULTS 73 OPERATIONS AND PROJECTS 107 MINERAL RESERVES AND RESOURCES 112 ADDITIONAL INFORMATION This management’s discussion and analysis (MD&A) include

February 20, 2025 EX-99.4

Consent of Independent Registered Public Accounting Firm

Exhibit 99.4 Consent of Independent Registered Public Accounting Firm The Board of Directors Cameco Corporation We consent to the incorporation by reference in the Registration Statements on Form S-8 (File Nos. 333-11736, 333-06180, 333-139165, 333-196422 and 333-281406) and the Registration Statement on Form F-10 (File No. 333-283140) of our reports dated February 19, 2025 with respect to the con

February 20, 2025 EX-99.2

2

Exhibit 99.2 Cameco Corporation 2024 consolidated financial statements February 19, 2025 Report of management’s accountability The accompanying consolidated financial statements have been prepared by management in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board. Management is responsible for ensuring that these statements, which

February 20, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of February, 2025 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of February, 2025 Cameco Corporation (Commission file No.

February 12, 2025 EX-99

EX-99

Exhibit 99 Pursuant to the instructions in Item 7 of Schedule 13G, the following table lists the identity and Item 3 classification, if applicable, of each relevant entity that beneficially owns shares of the security class being reported on this Schedule 13G.

January 27, 2025 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Production resumes at JV Inkai

Exhibit 99.1 TSX: CCO NYSE: CCJ website: cameco.com currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Production resumes at JV Inkai Saskatoon, Saskatchewan, Canada, January 27, 2025 . . . . . . . . . . . . . . Cameco (TSX: CCO; NYSE: CCJ) was informed by our partner, National Atomic Company Kazatomprom JSC (Kazatompro

January 27, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2025 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2025 Cameco Corporation (Commission file No.

January 23, 2025 EX-99.14

Ethics and U CODE OF CONDUCT AND ETHICS Safety and Environment | People | Integrity | Excellence

Exhibit 99.14 Ethics and U CODE OF CONDUCT AND ETHICS Safety and Environment | People | Integrity | Excellence “Our dedication to integrity allows us to take pride in our work and in our reputation as a good corporate citizen.” Dear Employees, Chief Executive President Officer, and Tim Gitzel At Cameco, we have built a strong reputation for maintaining standard of what we expect you to follow in a

January 23, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2025 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2025 Cameco Corporation (Commission file No.

January 17, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2025 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2025 Cameco Corporation (Commission file No.

January 17, 2025 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Westinghouse resolves technology export dispute with Korean Companies

Exhibit 99.1 TSX: CCO NYSE: CCJ   website: cameco.com   currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Westinghouse resolves technology export dispute with Korean Companies Saskatoon, Saskatchewan, Canada, January 16, 2025 . . . . . . . . . . . . .  Cameco (TSX: CCO; NYSE: CCJ) is pleased to announce and support the

January 10, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2025 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2025 Cameco Corporation (Commission file No.

January 10, 2025 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco acknowledges resignation of Westinghouse President and CEO

EX-99.1 Exhibit 99.1 TSX: CCO NYSE: CCJ website: cameco.com currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco acknowledges resignation of Westinghouse President and CEO Saskatoon, Saskatchewan, Canada, January 9, 2025 . . . . . . . . . . . . .  Cameco (TSX: CCO; NYSE: CCJ) acknowledges the dedicated work and lea

January 8, 2025 LETTER

LETTER

January 8, 2025 Grant Isaac Chief Financial Officer Cameco Corporation 2121 11th Street West Saskatoon, Saskatchewan Canada S7M 1J3 Re: Cameco Corporation Form 40-F for the fiscal year ended December 31, 2023 Filed March 22, 2024 File No.

January 2, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2025 Cameco Corporation (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2025 Cameco Corporation (Commission file No.

January 2, 2025 EX-1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Production suspension at JV Inkai

Exhibit 1 TSX: CCO NYSE: CCJ website: cameco.com currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Production suspension at JV Inkai Saskatoon, Saskatchewan, Canada, January 2, 2025 Cameco (TSX: CCO; NYSE: CCJ) was informed by our partner, National Atomic Company Kazatomprom JSC (Kazatomprom), and Joint Venture Inkai L

December 18, 2024 CORRESP

December 18, 2024 CAMECO CORPORATION Corporate Office 2121 – 11th Street West Saskatoon, Saskatchewan Canada S7M 1J3 FILED VIA EDGAR Division of Corporation Finance Tel 306.956.6200 Office of Energy & Transportation Fax 306.956.6201 United States Sec

December 18, 2024 CAMECO CORPORATION Corporate Office 2121 – 11th Street West Saskatoon, Saskatchewan Canada S7M 1J3 FILED VIA EDGAR Division of Corporation Finance Tel 306.

December 4, 2024 LETTER

LETTER

December 4, 2024 Grant Isaac Chief Financial Officer Cameco Corporation 2121 11th Street West Saskatoon, Saskatchewan Canada S7M 1J3 Re: Cameco Corporation Form 40-F for the fiscal year ended December 31, 2023 Filed March 22, 2024 File No.

November 13, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of November 2024 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of November 2024 Cameco Corporation (Commission file No.

November 13, 2024 EX-99.3

November 12, 2024

EX-99.3 Exhibit 99.3 November 12, 2024 VIA EDGAR Re: Cameco Corporation (the “Issuer”) Dear Ladies and Gentlemen: We refer to the prospectus supplement dated November 12, 2024 (the “Prospectus Supplement”) to the short form base shelf prospectus of Cameco Corporation (the “Issuer”), dated November 12, 2024, forming part of the Registration Statement on Form F-10 (File No. 333-283140) filed by the

November 13, 2024 EX-99.2

November 12, 2024

EX-99.2 Exhibit 99.2 November 12, 2024 VIA EDGAR Re: Cameco Corporation (the “Issuer”) Dear Ladies and Gentlemen: We refer you to the prospectus supplement dated November 12, 2024 (the “Prospectus Supplement”) to the base shelf prospectus of the Issuer dated November 12, 2024, forming part of the Registration Statement on Form F-10 (File No. 333-283140) filed by the Issuer with the U.S. Securities

November 13, 2024 EX-99.1

CAMECO CORPORATION EQUITY DISTRIBUTION AGREEMENT

EX-99.1 Exhibit 99.1 CAMECO CORPORATION US$500,000,000 EQUITY DISTRIBUTION AGREEMENT November 12, 2024 TD Securities Inc. 66 Wellington Street West, 10th Floor Toronto, Ontario M5K 1A2 TD Securities (USA) LLC 1 Vanderbilt Avenue New York, New York 10017 CIBC World Markets Inc. 161 Bay Street, 6th Floor Toronto, Ontario M5J 2S8 CIBC World Markets Corp. 300 Madison Ave, 6th Floor New York, New York

November 12, 2024 F-10

As filed with the Securities and Exchange Commission on November 12, 2024

F-10 As filed with the Securities and Exchange Commission on November 12, 2024 Registration No.

November 12, 2024 EX-FILING FEES

Calculation of Filing Fee Table Form F-10 (Form Type) Cameco Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities In United States Dollars (“USD”)

EXHIBIT 107 Calculation of Filing Fee Table Form F-10 (Form Type) Cameco Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities In United States Dollars (“USD”) Security Type Security Class Title  Fee Calculation Rule    Amount Registered (1)    Proposed Maximum   Offering Price Per Unit (1)    Maximum Aggregate  Offering Price (1) Fee Rate Amount of Registration Fee  Fees to be     Paid   Equity Common Shares Rule 457 (o) — $— $ —  0.

November 12, 2024 EX-5.8

CONSENT OF EXPERT

EX-5.8 Exhibit 5.8 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (the “Form F-10”) of Cameco Corporation (the “Corporation”) filed with the United States Securities and Exchange Commission (the “Commission”) pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in th

November 12, 2024 EX-5.7

CONSENT OF EXPERT

EX-5.7 Exhibit 5.7 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (the “Form F-10”) of Cameco Corporation (the “Corporation”) filed with the United States Securities and Exchange Commission (the “Commission”) pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in th

November 12, 2024 SUPPL

PROSPECTUS SUPPLEMENT To the Short Form Base Shelf Prospectus Dated November 12, 2024 New Issue November 12, 2024 CAMECO CORPORATION Up to US$500,000,000 Common Shares

Table of Contents Filed pursuant to General Instruction II.L. of Form F-10 File No. 333-283140 PROSPECTUS SUPPLEMENT To the Short Form Base Shelf Prospectus Dated November 12, 2024 New Issue November 12, 2024 CAMECO CORPORATION Up to US$500,000,000 Common Shares This prospectus supplement (this “Prospectus Supplement”) of Cameco Corporation (“Cameco”, “us”, “we” or the “Company”), together with th

November 12, 2024 SC 13G/A

CCJ / Cameco Corporation / FMR LLC Passive Investment

SCHEDULE 13G Amendment No.1 CAMECO CORP COMMON STOCK Cusip #13321L108 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [x] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) Cusip #13321L108 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 20,484,423 Item 6: 0 Item 7: 20,827,770 Item 8: 0 Item 9: 20,827,770 Item 11: 4.786%

November 12, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of November, 2024 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of November, 2024 Cameco Corporation (Commission file No.

November 12, 2024 EX-5.6

CONSENT OF EXPERT

EX-5.6 Exhibit 5.6 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (the “Form F-10”) of Cameco Corporation (the “Corporation”) filed with the United States Securities and Exchange Commission (the “Commission”) pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in th

November 12, 2024 EX-5.5

CONSENT OF EXPERT

EX-5.5 Exhibit 5.5 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (the “Form F-10”) of Cameco Corporation (the “Corporation”) filed with the United States Securities and Exchange Commission (the “Commission”) pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in th

November 12, 2024 EX-7.2

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE

EX-7.2 Exhibit 7.2 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) THE BANK OF NEW YORK MELLON (Exact name of trustee as specified in its charter) New York 13-51603

November 12, 2024 FWP

Issuer Free Writing Prospectus

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

November 12, 2024 EX-5.3

CONSENT OF EXPERT

EX-5.3 Exhibit 5.3 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (the “Form F-10”) of Cameco Corporation (the “Corporation”) filed with the United States Securities and Exchange Commission (the “Commission”) pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in th

November 12, 2024 EX-5.9

CONSENT OF EXPERT

EX-5.9 Exhibit 5.9 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (the “Form F-10”) of Cameco Corporation (the “Corporation”) filed with the United States Securities and Exchange Commission (the “Commission”) pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in th

November 12, 2024 EX-5.4

CONSENT OF EXPERT

EX-5.4 Exhibit 5.4 CONSENT OF EXPERT Reference is made to the Registration Statement on Form F-10 (the “Form F-10”) of Cameco Corporation (the “Corporation”) filed with the United States Securities and Exchange Commission (the “Commission”) pursuant to the United States Securities Act of 1933, as amended, and any amendments thereto. I hereby consent to reference to my name and my involvement in th

November 12, 2024 F-X

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM F-X APPOINTMENT OF AGENT FOR SERVICE OF PROCESS AND UNDERTAKING A.  Name of issuer or person filing (“Filer”): CAMECO CORPORATION B.  (1) This is [check one] ☒ an original f

F-X 1 d890785dfx.htm F-X UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM F-X APPOINTMENT OF AGENT FOR SERVICE OF PROCESS AND UNDERTAKING A.  Name of issuer or person filing (“Filer”): CAMECO CORPORATION B.  (1) This is [check one] ☒ an original filing for the Filer ☐ an amended filing for the Filer (2) Check the following box if you are filing the Form F-X in paper in

November 12, 2024 EX-99.1

Section # (description)

Exhibit 99.1 Inkai Operation Turkestan Region, Republic of Kazakhstan National Instrument 43-101 Technical Report Effective Date: September 30, 2024 Date of Technical Report: November 12, 2024 PREPARED FOR CAMECO CORPORATION BY: C. SCOTT BISHOP, P.ENG. SERGEY IVANOV, P.GEO. ALAIN D. RENAUD, P.GEO. Table of Contents 1    Summary 1 1.1   Operation overview 1 1.2   Property tenure 1 1.3   Location an

November 12, 2024 EX-7.1

TRUST INDENTURE CAMECO CORPORATION THE BANK OF NEW YORK MELLON as Trustee Dated as of May 22, 2012

EX-7.1 Exhibit 7.1 TRUST INDENTURE BETWEEN CAMECO CORPORATION and THE BANK OF NEW YORK MELLON as Trustee Indenture Dated as of May 22, 2012 TABLE OF CONTENTS Page ARTICLE 1. DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION 1 1.01 Definitions 1 1.02 Compliance Certificates and Opinions 16 1.03 Form of Documents Delivered to Trustee 16 1.04 Acts of Holders; Record Dates 17 1.05 Notices, Etc.,

November 7, 2024 EX-99.5

Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-99.5 Exhibit 99.5 Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Grant Isaac, executive vice-president and chief financial officer, of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material f

November 7, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of November, 2024 Cameco Corporation (Commission

FORM 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of November, 2024 Cameco Corporation (Commission file No.

November 7, 2024 EX-99.4

Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 99.4 Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Tim Gitzel, president and chief executive officer of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the

November 7, 2024 EX-99.3

2

EX-99.3 Exhibit 99.3 Cameco Corporation 2024 condensed consolidated interim financial statements (unaudited) November 6, 2024 Cameco Corporation Consolidated statements of earnings (Unaudited) Note Three months ended Nine months ended ($Cdn thousands, except per share amounts) Sep 30/24 Sep 30/23 Sep 30/24 Sep 30/23 Revenue from products and services 12 $ 720,596 $ 575,079 $ 1,952,599 $ 1,744,041

November 7, 2024 EX-99.2

Management’s discussion and analysis

EX-99.2 Exhibit 99.2 Management’s discussion and analysis for the quarter ended September 30, 2024 6 THIRD QUARTER MARKET UPDATE 10 OUR STRATEGY 13 CONSOLIDATED FINANCIAL RESULTS 17 OUTLOOK FOR 2024 22 LIQUIDITY AND CAPITAL RESOURCES 24 FINANCIAL RESULTS BY SEGMENT 28 OUR OPERATIONS - THIRD QUARTER UPDATES 31 QUALIFIED PERSONS 31 NON-IFRS MEASURES 37 ADDITIONAL INFORMATION This management’s discus

November 7, 2024 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201

EX-99.1 Exhibit 99.1 TSX: CCO NYSE: CCJ website: cameco.com currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco reports Q3 results; improving operational performance supports dividend growth; strengthening prospects amid growing demand for nuclear power; long-term contracting activity gaining momentum; strong annu

September 25, 2024 EX-2

Departments, Agency, etc... within Payee  that Received 

EX-2.01 Extractive Sector Transparency Measures Act - Annual Report Reporting Entity Name Cameco Corporation Reporting Year From 1/1/2023 To: 12/31/2023 Date submitted  6/13/2024 Reporting Entities May Insert Their Brand/Logo here Reporting Entity ESTMA Identification Number  E886600 Other Subsidiaries Included (optional field) Not Consolidated Not Substituted Attestation by Reporting Entity In ac

September 25, 2024 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Cameco Corporation (Exact name of registrant as specified in its charter) Canada 1-14228 98-0113090 (State or other jurisdiction of incorpor

Form SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT Cameco Corporation (Exact name of registrant as specified in its charter) Canada 1-14228 98-0113090 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) 2121-11th Street West Saskatoon, Saskatchewan, Canada S7M

September 25, 2024 EX-2.01.INS

XBRL INSTANCE DOCUMENT

0001009001 2023-01-01 2023-12-31 0001009001 ccj:CigarLakeMember 2023-01-01 2023-12-31 0001009001 ccj:RabbitLakeMember 2023-01-01 2023-12-31 0001009001 ccj:CrowButteResourcesMember 2023-01-01 2023-12-31 0001009001 ccj:PowerResourcesIncMember 2023-01-01 2023-12-31 0001009001 ccj:KeyLakeMember 2023-01-01 2023-12-31 0001009001 ccj:McArthurRiverMember 2023-01-01 2023-12-31 0001009001 ccj:CamecoCorporat

September 25, 2024 EX-2.01.SCH

XBRL TAXONOMY EXTENSION SCHEMA

Cameco Australia [Member] Cameco Corporation [Member] Cigar Lake [Member] Crow Butte Resources [Member] Exploration [Member] Key Lake [Member] McArthur River [Member] Power Resources Inc [Member] Rabbit Lake [Member] AUSTRALIA Australia CANADA Canada -Saskatchewan UNITED STATES United States of America Athabasca Community Trust [Member] English River First Nation [Member] Government of Western Aus

August 8, 2024 EX-4.3

CAMECO CORPORATION EMPLOYEE SHARE OWNERSHIP PLAN FOR EMPLOYEES OF NON-CANADIAN PARTICIPATING AFFILIATES (The Non-Canadian ESOP) Amendment and Restatement Effective January 1, 2023

EX-4.3 Exhibit 4.3 CAMECO CORPORATION EMPLOYEE SHARE OWNERSHIP PLAN FOR EMPLOYEES OF NON-CANADIAN PARTICIPATING AFFILIATES (The Non-Canadian ESOP) Amendment and Restatement Effective January 1, 2023 TABLE OF CONTENTS Page SECTION 1 DEFINITIONS AND INTERPRETATION 1 1.1 Definitions 1 1.2 Interpretation 4 SECTION 2 ESTABLISHMENT OF THE PLAN 5 2.1 Purpose 5 2.2 Effective Date of the Plan 5 2.3 Governm

August 8, 2024 EX-FILING FEES

Calculation of Filing Fee Table Form S-8 (Form Type) Cameco Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Cameco Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type  Security Class Title  Fee Calculation  Rule  Amount  Registered (1)(2)   Proposed  Maximum  Offering Price Per  Unit (3)   Maximum  Aggregate  Offering Price (3)   Fee Rate  Amount of  Registration Fee  Equity  Common Stock, no par value  Other  100,000 $36.

August 8, 2024 S-8

As filed with the United States Securities and Exchange Commission on August 8, 2024

S-8 As filed with the United States Securities and Exchange Commission on August 8, 2024 Registration No.

July 31, 2024 EX-99.2

CHANGE

Exhibit 99.2 Management’s discussion and analysis for the quarter ended June 30, 2024 6 SECOND QUARTER MARKET UPDATE 9 OUR STRATEGY 12 CONSOLIDATED FINANCIAL RESULTS 16 OUTLOOK FOR 2024 21 LIQUIDITY AND CAPITAL RESOURCES 23 FINANCIAL RESULTS BY SEGMENT 27 OUR OPERATIONS - SECOND QUARTER UPDATES 29 QUALIFIED PERSONS 29 NON-IFRS MEASURES 35 ADDITIONAL INFORMATION This management’s discussion and ana

July 31, 2024 EX-99.5

Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 99.5 Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Grant Isaac, executive vice-president and chief financial officer, of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact nece

July 31, 2024 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201

Exhibit 99.1 TSX: CCO NYSE: CCJ website: cameco.com currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco reports Q2 results: 2024 outlook on track; strong operational performance; financial results reflect transition to tier-one economics; durable demand outlook driving long-term price increases; disciplined strate

July 31, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of July, 2024 Cameco Corporation (Commission fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of July, 2024 Cameco Corporation (Commission file No.

July 31, 2024 EX-99.4

Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 99.4 Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Tim Gitzel, president and chief executive officer of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the

July 31, 2024 EX-99.3

Transaction value Three months ended

Exhibit 99.3 Cameco Corporation 2024 condensed consolidated interim financial statements (unaudited) July 30, 2024 Cameco Corporation Consolidated statements of earnings (Unaudited) Three months ended Six months ended ($Cdn thousands, except per share amounts) Note Jun 30/24 Jun 30/23 Jun 30/24 Jun 30/23 Revenue from products and services 12 $ 598,458 $ 481,987 $ 1,232,003 $ 1,168,961 Cost of prod

June 27, 2024 EX-1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco Releases 2023 Sustainability Report

Exhibit 1 TSX: CCO website: cameco.com currency: Cdn (unless noted) NYSE: CCJ 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco Releases 2023 Sustainability Report Saskatoon, Saskatchewan, Canada, June 27, 2024 . . . . . . . . . . . . .  Cameco (TSX: CCO; NYSE: CCJ) released its 2023 Sustainability Report today. The report communicates the

June 27, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of June, 2024 Cameco Corporation (Commission fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of June, 2024 Cameco Corporation (Commission file No.

May 28, 2024 EX-99.2

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 NOT FOR DISTRIBUTION IN THE UNITED STATES OR DISSEMINATION THROUGH U.S. NEWS OR WIRE SERVICES Cameco Completes $500 Million Debenture Offering

EX-99.2 Exhibit 99.2 TSX: CCO NYSE: CCJ website: cameco.com currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 NOT FOR DISTRIBUTION IN THE UNITED STATES OR DISSEMINATION THROUGH U.S. NEWS OR WIRE SERVICES Cameco Completes $500 Million Debenture Offering Saskatoon, Saskatchewan, Canada, May 24, 2024 . . . . . . . . . . .

May 28, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of May, 2024 Cameco Corporation (Commission file

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of May, 2024 Cameco Corporation (Commission file No.

May 28, 2024 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 NOT FOR DISTRIBUTION IN THE UNITED STATES OR DISSEMINATION THROUGH U.S. NEWS OR WIRE SERVICES Cameco Announces $500 Million Debenture Offering by Pri

EX-99.1 Exhibit 99.1 TSX: CCO NYSE: CCJ website: cameco.com currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 NOT FOR DISTRIBUTION IN THE UNITED STATES OR DISSEMINATION THROUGH U.S. NEWS OR WIRE SERVICES Cameco Announces $500 Million Debenture Offering by Private Placement Saskatoon, Saskatchewan, Canada, May 21, 2024 

May 10, 2024 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco Announces Election of Directors

EX-99.1 Exhibit 99.1 TSX: CCO NYSE: CCJ website: cameco.com currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco Announces Election of Directors Saskatoon, Saskatchewan, Canada, May 9, 2024 . . . . . . . . . . . . . Cameco (TSX: CCO; NYSE: CCJ) has announced the election of eight board members at its annual meeting

May 10, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of May, 2024 Cameco Corporation (Commission file

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of May, 2024 Cameco Corporation (Commission file No.

May 10, 2024 EX-99.2

CAMECO CORPORATION Corporate Office 2121 – 11th Street West Saskatoon, Saskatchewan Canada S7M 1J3 Tel 306.956.6200 Fax 306.956.6201 www.cameco.com

EX-99.2 Exhibit 99.2 CAMECO CORPORATION Corporate Office 2121 – 11th Street West Saskatoon, Saskatchewan Canada S7M 1J3 Tel 306.956.6200 Fax 306.956.6201 www.cameco.com May 9, 2024 Canadian Securities Administrators Cameco Corporation Annual Meeting May 9, 2024 Report of Voting Results Under National Instrument 51-102 In accordance with Section 11.3 of National Instrument 51-102 – Continuous Discl

April 30, 2024 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201

EX-99.1 Exhibit 99.1 TSX: CCO NYSE: CCJ website: cameco.com currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco reports Q1 results: 2024 outlook remains solid; financial discipline and strong cash position result in focused debt reduction; operationally, segments performing to plan; attributes of baseload nuclear

April 30, 2024 EX-99.5

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-99.5 Exhibit 99.5 Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Grant Isaac, executive vice-president and chief financial officer, of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material f

April 30, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2024 Cameco Corporation (Commission fi

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2024 Cameco Corporation (Commission file No.

April 30, 2024 EX-99.3

2

EX-99.3 Exhibit 99.3 Cameco Corporation 2024 condensed consolidated interim financial statements (unaudited) April 29, 2024 Cameco Corporation Consolidated statements of earnings (Unaudited) Note Three months ended ($Cdn thousands, except per share amounts) Mar 31/24 Mar 31/23 Revenue from products and services 12 $ 633,545 $ 686,975 Cost of products and services sold 403,558 443,422 Depreciation

April 30, 2024 EX-99.2

2024 OUTLOOK

EX-99.2 Exhibit 99.2 Management’s discussion and analysis for the quarter ended March 31, 2024 6 FIRST QUARTER MARKET UPDATE 9 OUR STRATEGY 11 CONSOLIDATED FINANCIAL RESULTS 15 OUTLOOK FOR 2024 20 LIQUIDITY AND CAPITAL RESOURCES 22 FINANCIAL RESULTS BY SEGMENT 26 OUR OPERATIONS - FIRST QUARTER UPDATES 28 QUALIFIED PERSONS 28 NON-IFRS MEASURES 33 ADDITIONAL INFORMATION This management’s discussion

April 30, 2024 EX-99.4

Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

EX-99.4 Exhibit 99.4 Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Tim Gitzel, president and chief executive officer of Cameco Corporation, certify that: 1. I have reviewed this quarterly report on Form 6-K of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to

April 9, 2024 EX-99.1

2

Exhibit 99.1 Cameco Corporation 2023 Modern Slavery Report For financial year ended December 31, 2023. Introduction Overview This Modern Slavery Report is Cameco Corporation’s annual report which has been produced in accordance with the Fighting Against Forced Labour and Child Labour in Supply Chains Act (the Act). It pertains to the financial year ended December 31, 2023, and is a joint report of

April 9, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2024 Cameco Corporation (Commission fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2024 Cameco Corporation (Commission file No.

April 5, 2024 EX-99.1

EX-99.1

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April 5, 2024 EX-99.3

Catherine Gignac Chair of the Board

EX-99.3 4 d99082dex993.htm EX-99.3 Exhibit 99.3 About Cameco Cameco is one of the largest global providers of the uranium fuel needed to energize a clean-air world. Our competitive position is based on our controlling ownership of the world’s largest high-grade uranium reserves and low-cost operations, as well as significant investments across the nuclear fuel cycle, including ownership interests

April 5, 2024 EX-99.4

Submit your proxy form — We must receive your completed form before 8:30 a.m. CST on Tuesday, May 7, 2024. If the meeting is postponed or adjourned, we must receive the form at least 48 hours (excluding Saturdays, Sundays and holidays) before the mee

Exhibit 99.4 Submit your proxy form — We must receive your completed form before 8:30 a.m. CST on Tuesday, May 7, 2024. If the meeting is postponed or adjourned, we must receive the form at least 48 hours (excluding Saturdays, Sundays and holidays) before the meeting is reconvened. The chair of the meeting has the discretion to accept or reject any late proxies and can waive or extend the deadline

April 5, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2024 Cameco Corporation (Commission fi

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2024 Cameco Corporation (Commission file No.

April 5, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2024 Cameco Corporation (Commission fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of April, 2024 Cameco Corporation (Commission file No.

April 5, 2024 EX-99.1

Notice of our 2024 annual meeting of shareholders

Exhibit 99.1 Notice of our 2024 annual meeting of shareholders When Thursday, May 9, 2024 8:30 a.m. CST Via live webcast from Saskatoon, SK https://web.lumiagm.com/436776211 password: cameco2024 (case sensitive) Your vote is important If you held Cameco common shares on March 11, 2024 (the record date), you are entitled to receive notice of and to vote at this meeting. You can vote in advance or i

April 5, 2024 EX-99.2

Notice and Access Notification to Shareholders

Exhibit 99.2   Notice and Access Notification to Shareholders Notice of 2024 Annual Meeting of Shareholders and Notice of Availability of Meeting Materials  Annual Meeting of Shareholders of Cameco Corporation will be held:  When: Thursday, May 9, 2024 Via live audio webcast from Saskatoon, SK at 8:30 a.m. (Saskatoon time) https://web.lumiagm.com/436776211 (password cameco2024) Cameco Corporation

March 22, 2024 EX-99.9

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

EXHIBIT 99.9 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of Cameco Corporation (the “Company”) on Form 40-F for the year ended December 31, 2023, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Grant Isaac, Executive Vice-President and Chief

March 22, 2024 EX-99.1

Cameco Corporation 2023 Annual Information Form March 22, 2024

EXHIBIT 99.1 Cameco Corporation 2023 Annual Information Form March 22, 2024 Cameco Corporation 2023 Annual information form March 22, 2024 Contents Important information about this document 1 Our business 6 Our vision, values and strategy 11 Operations, projects and investments 25 Uranium – Tier-one operations 26 Uranium – Tier-two operations 71 Uranium – Advanced projects 73 Uranium – Exploration

March 22, 2024 EX-99.12

CONSENT OF EXPERT

EXHIBIT 99.12 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation (the “Corporation”) to be filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prepar

March 22, 2024 EX-99.5

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

EXHIBIT 99.5 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM The Board of Directors Cameco Corporation We consent to the use of: • our report dated February 7, 2024 on the consolidated financial statements of Cameco Corporation (the “Entity”) which comprise the consolidated statements of financial position as of December 31, 2023 and 2022, the related consolidated statements of earnings,

March 22, 2024 EX-99.15

CONSENT OF EXPERT

EXHIBIT 99.15 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation (the “Corporation”) to be filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prepar

March 22, 2024 EX-99.14

CONSENT OF EXPERT

EXHIBIT 99.14 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation (the “Corporation”) to be filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prepar

March 22, 2024 EX-99.3

Cameco Corporation 2023 Management’s Discussion and Analysis February 8, 2024

EXHIBIT 99.3 Cameco Corporation 2023 Management’s Discussion and Analysis February 8, 2024 Management’s discussion and analysis February 8, 2024 10 MARKET OVERVIEW AND DEVELOPMENTS 17 2023 PERFORMANCE HIGHLIGHTS 22 OUR VISION, VALUES AND STRATEGY 32 OUR ESG PRINCIPLES AND PRACTICES 36 MEASURING OUR RESULTS 38 FINANCIAL RESULTS 69 OPERATIONS AND PROJECTS 100 MINERAL RESERVES AND RESOURCES 105 ADDIT

March 22, 2024 EX-99.7

CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

EXHIBIT 99.7 CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED I, Grant Isaac, certify that: 1. I have reviewed this Annual Report on Form 40-F of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in lig

March 22, 2024 40-F

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 40-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13(a) or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 Commission file number : 1-14228 CAMECO CORPORATION (Exact name of Registrant as specified in

March 22, 2024 EX-99.2

Section Number (description)

Exhibit 99.2 Cigar Lake Operation Northern Saskatchewan, Canada National Instrument 43-101 Technical Report Effective Date: December 31, 2023 Date of Technical Report: March 22, 2024 PREPARED FOR CAMECO CORPORATION BY: BIMAN BHARADWAJ, P. ENG. C. SCOTT BISHOP, P. ENG. ALAIN D. RENAUD, P. GEO. LLOYD ROWSON, P. ENG. Table of Contents 1    SUMMARY 1 1.1   Preamble 1 1.2   Introduction 1 1.3   Propert

March 22, 2024 EX-99.8

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

EXHIBIT 99.8 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of Cameco Corporation (the “Company”) on Form 40-F for the year ended December 31, 2023, as filed with the U.S. Securities and Exchange Commission on the date hereof (the “Report”), I, Tim Gitzel, President and Chief Executive Offic

March 22, 2024 EX-99.18

EXECUTIVE INCENTIVE COMPENSATION RECOUPMENT POLICY (SEC AND NYSE)

EXHIBIT 99.18 EXECUTIVE INCENTIVE COMPENSATION RECOUPMENT POLICY (SEC AND NYSE) Purpose This Executive Incentive Compensation Recoupment Policy (SEC and NYSE) has been adopted by Cameco Corporation (Cameco) to enhance its alignment with good compensation governance practices, to comply with requirements set forth by the U.S. Securities and Exchange Commission and the New York Stock Exchange, and t

March 22, 2024 EX-99.4

For fiscal years ended December 31, 2023 and December 31, 2022, KPMG LLP and its affiliates billed Cameco Corporation and its subsidiaries the following fees:

EXHIBIT 99.4 For fiscal years ended December 31, 2023 and December 31, 2022, KPMG LLP and its affiliates billed Cameco Corporation and its subsidiaries the following fees: 2023 ($) % of total fees 2022 ($) % of total fees Audit fees Cameco1 2,436,700 88.7 2,389,200 82.8 Subsidiaries2 135,600 4.9 136,800 4.7 Total audit fees 2,572,300 93.6 2,526,000 87.5 Audit-related fees Translation services3 — 

March 22, 2024 EX-99.13

CONSENT OF EXPERT

EXHIBIT 99.13 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation (the “Corporation”) to be filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prepar

March 22, 2024 EX-99.16

CONSENT OF EXPERT

EXHIBIT 99.16 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation (the “Corporation”) to be filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prepar

March 22, 2024 EX-99.6

CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

EXHIBIT 99.6 CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE U.S. SECURITIES EXCHANGE ACT OF 1934, AS AMENDED I, Tim Gitzel, certify that: 1. I have reviewed this Annual Report on Form 40-F of Cameco Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in ligh

March 22, 2024 EX-99.11

CONSENT OF EXPERT

EXHIBIT 99.11 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation (the “Corporation”) to be filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prepar

March 22, 2024 EX-99.10

CONSENT OF EXPERT

EXHIBIT 99.10 CONSENT OF EXPERT Reference is made to the Annual Report on Form 40-F (the “Form 40-F”) of Cameco Corporation (the “Corporation”) to be filed with the United States Securities and Exchange Commission pursuant to the United States Securities Exchange Act of 1934, as amended. I hereby consent to reference to my name and my involvement in the preparation of, or supervision of the prepar

March 22, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of March, 2024 Cameco Corporation (Commission fi

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of March, 2024 Cameco Corporation (Commission file No.

March 22, 2024 EX-99.2

2023 CONSOLIDATED FINANCIAL

2023 CONSOLIDATED FINANCIAL STATEMENTS AND NOTES 1 EXHIBIT 99.2 Cameco Corporation 2023 Consolidated Audited Financial Statements February 7, 2024 2 CAMECO CORPORATION Cameco Corporation 2023 consolidated financial statements February 7, 2024 2023 CONSOLIDATED FINANCIAL STATEMENTS AND NOTES 3 Report of management’s accountability The accompanying consolidated financial statements have been prepare

March 22, 2024 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco Reports Document Filings

Exhibit 99.1 TSX: CCO website: cameco.com NYSE: CCJ currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco Reports Document Filings Saskatoon, Saskatchewan, Canada, March 22, 2024 . . . . . . . . . . . . .  Cameco (TSX: CCO; NYSE: CCJ) reported today that it filed its annual report on Form 40-F with the US Securities

February 9, 2024 SC 13G

CCJ / Cameco Corporation / FMR LLC Passive Investment

SC 13G 1 filing.txt SCHEDULE 13G Amendment No.0 CAMECO CORP COMMON STOCK Cusip #13321L108 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [x] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) Cusip #13321L108 Item 1: Reporting Person - FMR LLC Item 2: (a) [ ] (b) [ ] Item 4: Delaware Item 5: 30,969,789 Item 6: 0 Item 7: 31,121,208 Item 8: 0 Item 9: 31,121,

February 9, 2024 SC 13G

CCJ / Cameco Corporation / BlackRock Inc. Passive Investment

SC 13G 1 ca13321l1085020924.txt ca13321l1085020924.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: ) CAMECO CORP - (Name of Issuer) Common Stock - (Title of Class of Securities) 2158684 - (SEDOL Number) December 31, 2023 - (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designat

February 8, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of February, 2024 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of February, 2024 Cameco Corporation (Commission file No.

February 8, 2024 EX-99.3

TARGET

EX-99.3 Exhibit 99.3 Management’s discussion and analysis February 8, 2024 10 MARKET OVERVIEW AND DEVELOPMENTS 17 2023 PERFORMANCE HIGHLIGHTS 22 OUR VISION, VALUES AND STRATEGY 32 OUR ESG PRINCIPLES AND PRACTICES 36 MEASURING OUR RESULTS 38 FINANCIAL RESULTS 69 OPERATIONS AND PROJECTS 100 MINERAL RESERVES AND RESOURCES 105 ADDITIONAL INFORMATION This management’s discussion and analysis (MD&A) inc

February 8, 2024 EX-99.2

2

EX-99.2 Exhibit 99.2 Cameco Corporation 2023 consolidated financial statements February 7, 2024 Report of management’s accountability The accompanying consolidated financial statements have been prepared by management in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board. Management is responsible for ensuring that these statements

February 8, 2024 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201

Exhibit 99.1 TSX: CCO website: cameco.com NYSE: CCJ currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco announces 2023 results; strategically positioned to increase tier-one production as security of supply contracting cycle advances; maintaining disciplined financial management and growth; improving Westinghouse

January 19, 2024 EX-99.99

Form 51-102F4 BUSINESS ACQUISITION REPORT

EX-99.99 Exhibit 99.99 Form 51-102F4 BUSINESS ACQUISITION REPORT Item 1 Identity of Company 1.1 Name and Address of Company Cameco Corporation (“Cameco”) is a corporation existing under the Canada Business Corporations Act. The head office of Cameco is located at 2121 - 11th Street West, Saskatoon, Saskatchewan S7M 1J3. 1.2 Executive Officer The name of the executive officer of Cameco, who is know

January 19, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2024 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2024 Cameco Corporation (Commission file No.

January 12, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2024 Cameco Corporation (Commission

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 Under the Securities Exchange Act of 1934 For the month of January, 2024 Cameco Corporation (Commission file No.

January 12, 2024 EX-99.14

Ethics and U CODE OF CONDUCT AND ETHICS Safety and Environment | People | Integrity | Excellence

EX-99.14 Exhibit 99.14 Ethics and U CODE OF CONDUCT AND ETHICS Safety and Environment | People | Integrity | Excellence Dear Employees, At Cameco, we have built a strong reputation for maintaining the highest standards of ethical behaviour. This is what has helped the company grow into the global business it is today, and is essential as we carry out our vision of Energizing a Clean-Air World. As

December 1, 2023 EX-99.1

2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco Board Appoints New Chair

EX-99.1 Exhibit 99.1 TSX: CCO NYSE: CCJ website: cameco.com currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco Board Appoints New Chair Saskatoon, Saskatchewan, Canada, November 30, 2023 . . . . . . . . . . . . . Cameco (TSX: CCO; NYSE: CCJ) announced today the appointment of Catherine Gignac as chair of Cameco’s

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