Cameco : 2025 estma reporting

About this update from Cameco Corporation

UNCLASSIFIED - NON CLASSIFIÉ # 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 Original Submission Amended Report Other Subsidiaries Included (optional field) Not Consolidated Not Substituted Attestation by Reporting Entity In accordance with the requirements of the ESTMA, and in particular section 9 thereof, I attest I have reviewed the information contained in the ESTMA report for the entity(ies) listed above. Based on my knowledge, and having exercised reasonable diligence, the information in the ESTMA report is true, accurate and complete in all material respects for the purposes of the Act, for the reporting year listed above. Full Name of Director or Officer of Reporting Entity Heidi Shockey Date 2026-05-29 Position Title Senior Vice-President and Chief Financial Officer 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 Entities (if necessary) Payments by Payee Country Payee Name 1 Departments, Agency, etc… within Payee that Received Payments 2 Taxes Royalties Fees Production Entitlements Bonuses Dividends Infrastructure Improvement Payments Total Amount paid to Payee Notes 34 Canada national government of Canada 68,980,000 5,890,000 74,870,000 Payments for Corporate taxes and regulatory oversight. Departments include Receiver General † , Canadian Nuclear Safety Commission (CNSC), Industry Canada, & Environment Canada. Canada -Saskatchewan the province of Saskatchewan 9,170,000 182,820,000 5,170,000 197,160,000 Payments for property taxes, royalties, highway maintenance, and regulatory oversight. Departments include Ministry of Economy, Ministry of Finance, Ministry of Government Relations, Ministry of Environment, Ministry of Highways & Infrastructure. Canada -Ontario the province of Ontario Ministry of Finance 50,000 50,000 Payments for mandatory hoist rope testing Canada -Saskatchewan Athabasca Community Trust 4,720,000 4,720,000 Payments to the trust are attributed to Black Lake Denesuline First Nation, Fond du Lac Denesuline First Nation, Hatchet Lake Denesuline First Nation, northern hamlet of Stony Rapids, northern settlement of Wollaston Lake, northern settlement of Uranium City, and northern settlement of Camsell Portage. Canada -Saskatchewan English River First Nation 1,450,000 1,450,000 Payments are comprised of contributions stipulated in collaboration agreements with the community. These include payments directly to the community and to a community-owned contractor and consultant. Some payments are made to support the building and maintenance of community facilities Canada -Saskatchewan Lac La Ronge Indian Band Community Trust 770,000 770,000 Payments based on the collaboration agreement, including funding for education and community liaison. The trust is attributed to the communities of Grandmother's Bay, Hall Lake, La Ronge, Little Red River, Stanley Mission, and Sucker River Canada -Saskatchewan northern village of Pinehouse 2,110,000 2,110,000 Payments are mostly comprised of contributions stipulated in collaboration agreements with the community. These include payments directly to the community and to a community-owned contractor. Some payments are made to support the building and maintenance of community facilities Canada -Saskatchewan Six Rivers Fund 100,000 100,000 Trust fund to benefit indigenous communities in Northern Saskatchewan. Money is granted to projects to support youth, education, health & wellness, and sports & recreaction. United States of America national government of United States of America 1,870,000 1,870,000 Departments include Nuclear Regulatory Commission, Bureau of Land Management, Department of Agriculture. Transaction occurred in USD$, converted to CAD$ at the exchange rate existing at time of payments (Avg. $1.41 CAD/USD). Extractive Sector Transparency Measures Act - Annual Report Reporting Year From: 2025-01-01 To: 2025-12-31 Reporting Entity Name Cameco Corporation Currency of the Report CAD Reporting Entity ESTMA Identification Number E886600 Subsidiary Reporting Entities (if necessary) Payments by Payee Country Payee Name 1 Departments, Agency, etc… within Payee that Received Payments 2 Taxes Royalties Fees Production Entitlements Bonuses Dividends Infrastructure Improvement Payments Total Amount paid to Payee Notes 34 United States of America the state of Wyoming 100,000 430,000 530,000 Departments include Department of Environmental Quality,Office of State Lands and Investments, Department of Revenue, Secretary of State. Transaction occurred in USD$, converted to CAD$ at the exchange rate existing at time of payments (Avg. $1.41 CAD/USD) United States of America the state of Nebraska 110,000 110,000 Departments include Department of Environmental Quality, Board of Education, Department of Health & Human Services. Transaction occurred in USD$, converted to CAD$ at the exchange rate existing at time of payments (Avg. $1.41 CAD/USD) United States of America the municipality of Campbell County 250,000 250,000 Wyoming county authority (North Butte). Payments for property taxes & licence fees. Transaction occurred in USD$, converted to CAD$ at the exchange rate existing at time of payments (Avg. $1.41 CAD/USD) United States of America the municipality of Converse County 540,000 40,000 580,000 Wyoming county authority (Smith Ranch-Highland). Payments for property taxes & licence fees. Transaction occurred in USD$, converted to CAD$ at the exchange rate existing at time of payments (Avg. $1.41 CAD/USD) United States of America the municipality of Dawes County 90,000 10,000 100,000 Nebraska county authority (Crow Butte). Payments for property taxes & licence fees. Transaction occurred in USD$, converted to CAD$ at the exchange rate existing at time of payments (Avg. $1.41 CAD/USD) United States of America the municipality of Fremont County 10,000 10,000 Wyoming county authority (Gas Hills). Payments for property taxes. Transaction occurred in USD$, converted to CAD$ at the exchange rate existing at time of payments (Avg. $1.37 CAD/USD) Australia Government of Western Australia Department of Mines & Petroleum 250,000 250,000 Payments for regulatory oversight. Transaction occurred in AUD$, converted to CAD$ at the exchange rate existing at time of payments (Avg. $0.90 CAD/AUD) Australia Western Desert Lands Aboriginal Corp 50,000 50,000 Payments to the holding corporation are attributed to the Martu peoples. Transaction occurred in AUD$, converted to CAD$ at the exchange rate existing at time of payments (Avg. $0.90 CAD/AUD) Additional Notes: As required by Canada's Extractive Sector Transparency Measures Act (ESTMA), Cameco has reported to the Canadian government payments made to governments in Canada, the United States, and Australia. These payments include royalties, taxes and fees paid during a year by Cameco and its subsidiaries to various levels of government related to commercial development. Under ESTMA commercial development captures the exploration and extraction of minerals and does not include post-extraction activities, such as refining, processing, marketing, distribution, transportation or export. † Income taxes paid to the Receiver General (Government of Canada) relates to both exploration and extraction of minerals, as well as post-extraction activities. As a result, these payments are not fully attributable to extractive activities. Additionally, our 2025 payments are expected to be refunded in future periods and have been recorded as a receivable in the Company's financial statements (see note 10 to Cameco's annual consolidated financial statements for the year ended December 31, 2025). 1 Enter the proper name of the Payee receiving the money (i.e. the municipality of x, the province of y, national government of z). 2 Department, Agency, Etc. 3 When payments are made in-kind, the notes field must highlight which payment includes in-kind contributions and the method for calculating the value of the payment. 4 Any payments made in currencies other than the report currency must be identified. The Reporting Entity may use the Additional notes row or the Notes column to identify any payments that are converted, along with the exchange rate and primary method used for currency conversions. 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 Entities (if necessary) Payments by Project Country Project Name 1 Taxes Royalties Fees Production Entitlements Bonuses Dividends Infrastructure Improvement Payments Total Amount paid by Project Notes 23 Canada -Saskatchewan Cameco Corporation 68,980,000 182,820,000 9,160,000 260,960,000 income taxes † , corporate royalties & colloboration agreements that are not assigned/attributed to a specific project Canada -Saskatchewan Key Lake 1,200,000 4,430,000 5,630,000 property taxes & regulatory fees (100% of payments reported, Cameco ownership 83.3%) Canada -Saskatchewan McArthur River 2,620,000 2,250,000 4,870,000 property taxes & regulatory fees (100% of payments reported, Cameco ownership 69.8%) Canada -Saskatchewan Cigar Lake 5,010,000 2,300,000 7,310,000 property taxes & regulatory fees (100% of payments reported, Cameco ownership 54.5%) Canada -Saskatchewan Rabbit Lake 340,000 1,950,000 2,290,000 property taxes & regulatory fees Canada -Saskatchewan Exploration 160,000 160,000 claim staking and maintenance fees United States of America Crow Butte Resources 90,000 1,110,000 1,200,000 property taxes & regulatory fees Transaction occurred in USD$, converted to CAD$ at the exchange rate existing at time of payment (Avg. $1.40 CAD/USD) United States of America Power Resources Inc 810,000 100,000 1,350,000 2,260,000 property taxes, regulatory fees, claims fees & lease payments Transaction occurred in USD$, converted to CAD$ at the exchange rate existing at time of payment (Avg. $1.40 CAD/USD) Australia Cameco Australia . 300,000 300,000 regulatory oversight and community based payments Transaction occurred in AUD$, converted to CAD$ at the exchange rate existing at time of payment (Avg. $0.90 CAD/AUD) Additional Notes 3 : As required by Canada's Extractive Sector Transparency Measures Act (ESTMA), Cameco has reported to the Canadian government payments made to governments in Canada, the United States, and Australia. These payments include royalties, taxes and fees paid during a year by Cameco and its subsidiaries to various levels of government related to commercial development. Under ESTMA commercial development captures the exploration and extraction of minerals and does not include post-extraction activities, such as refining, processing, marketing, distribution, transportation or export. † Income taxes paid to the Receiver General (Government of Canada) relates to both exploration and extraction of minerals, as well as post-extraction activities. As a result, these payments are not fully attributable to extractive activities. Additionally, our 2025 payments are expected to be refunded in future periods and have been recorded as a receivable in the Company's financial statements (see note 10 to Cameco's annual consolidated financial statements for the year ended December 31, 2025).

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