Cameco (NYSE: CCJ) details 2025 sustainability reporting progress

Rhea-AI Filing Summary

Cameco Corporation has released its 2025 Sustainability Report, outlining how it manages environmental impacts, worker safety, social programs, economic contributions, and governance practices. The report highlights initiatives and key metrics that demonstrate progress and a goal of continually advancing sustainability reporting.

Cameco aligns its disclosure with Sustainability Accounting Standards Board indicators, continues integrating Task Force on Climate-Related Financial Disclosures recommendations, and includes additional indicators, some based on the GRI Standards framework. The board of directors and executive team oversee sustainability strategy and reporting, and selected indicators have third-party limited assurance.

Key Terms

Sustainability Accounting Standards Board (SASB), Task Force on Climate-Related Financial Disclosures (TCFD), GRI Standards framework, third-party limited assurance, +1 more

5 terms

Sustainability Accounting Standards Board (SASB) financial

"Cameco has incorporated relevant Sustainability Accounting Standards Board (SASB) performance indicators"

A sustainability accounting standards board (SASB) develops industry-specific standards that tell companies which environmental, social, and governance issues are likely to affect financial performance and should be disclosed to investors. Think of it as a checklist that makes sustainability information consistent and comparable across companies, helping investors judge risks and opportunities—like assessing how well different cars score on fuel efficiency when deciding which to buy.

Task Force on Climate-Related Financial Disclosures (TCFD) financial

"continued our progress toward integrating the recommendations of the Task Force on Climate-Related Financial Disclosures (TCFD)"

A set of recommended disclosures on how climate change creates financial risks and opportunities for a company, covering governance, strategy, risk management and metrics. Think of it like a standardized inspection report that helps investors compare how well different companies identify and prepare for climate-related threats and chances; clearer, consistent reporting makes it easier to assess long-term risk, value and where to put capital.

GRI Standards framework financial

"some of which are based on the GRI Standards framework that we used as the basis of our sustainability reporting prior to 2020"

third-party limited assurance financial

"We have obtained a third-party limited assurance report on selected performance indicators."

forward-looking information regulatory

"This news release includes statements considered to be forward-looking information or forward-looking statements"

Forward-looking information are predictions, plans, estimates or expectations about a company’s future performance, results or events, such as sales forecasts, project timelines, or anticipated costs. It matters to investors because these statements guide expectations but rely on assumptions and uncertain factors—like a weather forecast for a business—so investors should treat them as informed guesses rather than guarantees and consider the risks and possible changes behind the numbers.

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Available on EDGAR 06/26/2026 - 10:10 AM Accepted by SEC EDGAR 06/26/2026 - 10:10 AM Learn about SEC filing dates

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.

Form 20-F         Form 40-F ✓  

Exhibit Index

Exhibit No.		Description
99.1		Press Release dated June 25, 2026

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: June 26, 2026				Cameco Corporation
				By: /s/ R. Liam Mooney
				R. Liam Mooney
				Senior Vice-President and Chief Legal Officer

Exhibit 99.1

NEWS RELEASE   All amounts in Canadian dollars unless specified otherwise www.cameco.com   Saskatoon   Saskatchewan Canada

Cameco Releases 2025 Sustainability Report

June 25, 2026

Cameco (TSX: CCO; NYSE: CCJ) released its 2025 Sustainability Report today, which communicates the initiatives and key metrics that demonstrate Cameco’s progress to date and the continual advancement of our sustainability reporting.

“As I reflect on the past year, I see our commitment to operating sustainably and with integrity embedded in everything we do. It’s evident in how we manage our environmental impacts, in the way we treat our people, and in how we invest in communities and people to build local capacity,” CEO Tim Gitzel says.

Sustainability highlights from 2025 include:

● The development of nine site-specific climate adaptation plans;

● $292 million procured from northern-owned companies;

● A greater than 20% reduction in our combined Total Recordable Injury Rate since 2023;

● 49% of the workforce at our northern Saskatchewan operations self-identified as Indigenous; and,

● More than $1 million donated to charities through our employee giving campaign.

Cameco is committed to transparency and accountability for quality reporting on sustainability matters to our providers of capital, customers, employees, regulators, local Indigenous Peoples, communities around our operations, and other stakeholders.

We are continuing our longstanding practice of disclosing our sustainability performance through an extensive range of environment, safety, social, economic, and governance indicators.

In this report, Cameco has incorporated relevant Sustainability Accounting Standards Board (SASB) performance indicators and continued our progress toward integrating the recommendations of the Task Force on Climate-Related Financial Disclosures (TCFD). The report can be downloaded or read online at www.cameco.com/about/sustainability.

Cameco’s board of directors and executive team oversee the company’s sustainability strategy, execution, and reporting. In addition to SASB and TCFD, the report contains other key performance indicators that we believe have an important bearing on Cameco’s long-term sustainability, some of which are unique to our company and some of which are based on the GRI Standards framework that we used as the basis of our sustainability reporting prior to 2020. We have obtained a third-party limited assurance report on selected performance indicators.

Profile

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 reserves and low-cost operations, as well as significant investments across the nuclear fuel cycle, including ownership interests in Westinghouse Electric Company and Global Laser Enrichment. Utilities around the world rely on Cameco to provide global nuclear fuel solutions for the generation of safe, reliable, carbon-free nuclear power. Our shares trade on the Toronto and New York stock exchanges. Our head office is in Saskatoon, Saskatchewan, Canada.

As used in this news release, the terms we, us, our, the Company and Cameco mean Cameco Corporation and its subsidiaries unless otherwise indicated.

Caution about forward-looking information

This news release includes statements considered to be forward-looking information or forward-looking statements under Canadian and U.S. securities laws (which we refer to as forward-looking information), including: our goal of continual advancement of our sustainability reporting, including transparency and accountability for quality reporting on sustainability matters; our commitment to operating sustainably and with integrity; and our goal of investing in communities and people to build local capacity. This forward-looking information is based on a number of assumptions, including assumptions regarding our ability to maintain quality reporting on sustainability matters; our ability to operate sustainably and with integrity; and our ability to invest in communities and people to build local capacity. This information is subject to a number of risks, including: the risk that we may be unable to achieve our goal of investing in communities and people to build local capacity; the risk that we may not be able to maintain quality reporting on sustainability matters; and the risk that we may face unexpected challenges or delays in advancing our climate, environmental and social-related goals or that they may not achieve the intended outcomes or results. Additional assumptions and risks are detailed in the Caution About Forward-Looking Information in our Sustainability Report and our most recent annual and quarterly Management’s Discussion and Analysis. The forward-looking information in this news release represents our current views, and actual results may differ significantly. Forward-looking information is designed to help you understand our current views and may not be appropriate for other purposes. We will not necessarily update this information unless we are required to by securities laws.

- End -

Investor inquiries				Media inquiries
Cory Kos				Veronica Baker
306-716-6782				306-385-5541
cory_kos@cameco.com				veronica_baker@cameco.com

- 2 -

FAQ

What did Cameco (CCJ) announce in its June 2026 Form 6-K?

Cameco announced the release of its 2025 Sustainability Report. The report summarizes environmental, safety, social, economic, and governance metrics and initiatives, and shows how the company is advancing its sustainability reporting practices for investors, customers, employees, communities, and other stakeholders.

What does Cameco’s 2025 Sustainability Report focus on for CCJ investors?

The report focuses on how Cameco manages environmental impacts, worker safety, social programs, economic contributions, and governance. It provides key performance indicators and narrative context to help stakeholders understand Cameco’s approach to long-term sustainability and responsible operation across its global uranium fuel and nuclear fuel-cycle businesses.

Which reporting frameworks does Cameco (CCJ) use in its 2025 Sustainability Report?

Cameco incorporates Sustainability Accounting Standards Board (SASB) performance indicators and continues progress toward integrating Task Force on Climate-Related Financial Disclosures (TCFD) recommendations. It also uses additional indicators, some based on the GRI Standards framework that previously underpinned its sustainability reporting before 2020.

Who oversees sustainability strategy and reporting at Cameco (CCJ)?

Cameco’s board of directors and executive team oversee the company’s sustainability strategy, execution, and reporting. Their role includes guiding disclosure on environmental, safety, social, economic, and governance matters and aligning reporting with recognized frameworks such as SASB and TCFD for long-term corporate sustainability.

Does Cameco obtain external assurance on its sustainability metrics?

Yes, Cameco has obtained a third-party limited assurance report on selected performance indicators in its 2025 Sustainability Report. Limited assurance provides stakeholders additional confidence that key disclosed sustainability metrics have been independently reviewed against defined criteria by an external assurance provider.

Where can investors access Cameco’s 2025 Sustainability Report?

Investors can download or read Cameco’s 2025 Sustainability Report at the company’s website, www.cameco.com/about/sustainability. The report compiles narrative information and performance indicators on environmental, social, economic, and governance topics to support transparency and accountability in Cameco’s sustainability practices.

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 13.9 KB