CCJ 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, 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

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.

EX-99.1

Exhibit 99.1

Cameco Announces Westinghouse’s Confidential Submission of Draft Registration Statement for Proposed Initial Public Offering

July 31, 2026

Cameco (TSX: CCO; NYSE: CCJ) announced today that Westinghouse Electric Company, which is owned jointly by Cameco and Brookfield Renewable Partners, has confidentially submitted a draft registration statement on Form S-1 with the Securities and Exchange Commission relating to the proposed initial public offering of its common stock.

The number of shares to be offered and the price range for the proposed offering have not yet been determined, and the proposed offering will be subject to market and other conditions.

This press release does not constitute an offer to sell or the solicitation of an offer to buy any securities. Any offers to sell, solicitations or offers to buy, and sales of any securities will be made in accordance with the registration requirements of the Securities Act of 1933, as amended (the “Securities Act”). This announcement is being issued in accordance with Rule 135 under the Securities Act.

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.

• End -