IsoEnergy files 6-K on added Premier American securities

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What did IsoEnergy Ltd. (ISOU) report in its December 2025 Form 6-K?

What is the key exhibit in IsoEnergy Ltd.’s (ISOU) December 2025 6-K?

Which company’s securities did IsoEnergy Ltd. (ISOU) acquire according to the 6-K?

What is IsoEnergy Ltd.’s reporting status under U.S. securities rules?

Who signed IsoEnergy Ltd.’s December 2025 Form 6-K filing?

IsoEnergy Ltd., a foreign private issuer based in Toronto, furnished a Form 6-K for December 2025.

Accepted by SEC EDGAR 12/30/2025 - 05:08 PM EST

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Form Type

6-K

IsoEnergy Ltd., a foreign private issuer based in Toronto, furnished a Form 6-K for December 2025. The filing forwards a news release dated December 30, 2025 as Exhibit 99.1, titled “IsoEnergy Acquires Additional Securities in Premier American Uranium Inc.”

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IsoEnergy Ltd. submitted a Form 6-K for December 2025 to provide a news release dated December 30, 2025, describing that IsoEnergy acquired additional securities in Premier American Uranium Inc. The report mainly serves to furnish this disclosure as an exhibit.

The key exhibit is 99.1, a news release dated December 30, 2025 titled “IsoEnergy Acquires Additional Securities in Premier American Uranium Inc.” This exhibit contains the detailed disclosure that the 6-K is transmitting to the market and regulators.

According to the exhibit description, IsoEnergy acquired additional securities in Premier American Uranium Inc. The Form 6-K itself only identifies this transaction through the title of Exhibit 99.1, which is the related news release dated December 30, 2025.

IsoEnergy Ltd. is identified as a foreign private issuer that files its annual reports under cover of Form 20-F. This status allows it to use Form 6-K to furnish interim information such as news releases to U.S. investors and the SEC.

ISOENERGY LTD.

Date: December 30, 2025

/s/ Graham du Preez

Name: Graham du Preez

Title: Chief Financial Officer

The filing was signed on behalf of IsoEnergy Ltd. by Graham du Preez, the company’s Chief Financial Officer, dated December 30, 2025. His signature confirms that the company has duly caused the report to be submitted under the Securities Exchange Act of 1934.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 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 December 2025

Commission File Number 001-42611

ISOENERGY LTD.

(Exact name of Registrant as specified in its charter)

N/A

(Translation of Registrant’s name into English)

217 Queen Street West, Suite 303

Toronto, Ontario

M5V 0R2

Tel: 1-833-572-2333

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F ☐ Form 40-F ☒

EXHIBIT INDEX

Exhibit Number	Description

99.1	News Release dated December 30, 2025 - IsoEnergy Acquires Additional Securities in Premier American Uranium Inc.

SIGNATURES

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

Source: View Original Filing on SEC EDGAR