MAC Copper files Form 6-K with F-3 tie-in

MAC Copper Limited furnished a Form 6-K for October 2025 as a foreign private issuer.

Accepted by SEC EDGAR 10/09/2025 - 06:54 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

MAC Copper Limited furnished a Form 6-K for October 2025 as a foreign private issuer. The report primarily serves a procedural role by attaching a press release dated October 9, 2025 as an exhibit. It also states that this Form 6-K, including all exhibits, is incorporated by reference into MAC Copper’s existing shelf registration statement on Form F-3 (Registration No. 333-276216), making the information in the press release and any other exhibits legally part of that registration statement.

FAQ

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What does MAC Copper Limited (MTAL) report in this October 2025 Form 6-K?

MAC Copper Limited’s Form 6-K for October 2025 mainly furnishes a press release dated October 9, 2025. The filing is administrative, updating U.S. investors and formally adding this press release to the company’s U.S. disclosure record.

How is this MAC Copper (MTAL) Form 6-K linked to the company’s Form F-3 shelf?

The Form 6-K explicitly states it is incorporated by reference into MAC Copper’s existing Form F-3 registration statement (No. 333-276216. This means the 6-K and its exhibits become legally part of that registration.

What exhibit is included in MAC Copper Limited’s October 2025 Form 6-K?

The Form 6-K includes a single exhibit, labeled Exhibit 99.1, which is a press release of MAC Copper Limited dated October 9, 2025. The detailed content of this press release is not shown in the excerpt.

Who signed MAC Copper Limited’s October 2025 Form 6-K filing?

The Form 6-K is signed on behalf of MAC Copper Limited by Michael James McMullen. He signs in his capacity as Chief Executive Officer, confirming the company has duly caused the report to be filed.

Does this MAC Copper (MTAL) Form 6-K contain financial results or earnings data?

The excerpted Form 6-K does not present financial or earnings figures. It functions mainly as a procedural filing, furnishing a dated press release and tying that disclosure into MAC Copper’s existing Form F-3 registration statement.

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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 of the Securities Exchange Act of 1934

For the month of	October		2025
Commission File Number	001-41722

MAC COPPER LIMITED

(Translation of registrant’s name into English)

3rd Floor, 44 Esplanade

St. Helier, Jersey, JE4 9WG

Tel: +(817) 698-9901

(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 x Form 40-F ¨

Incorporation By Reference

This Report on Form 6-K, including all exhibits hereto, shall be deemed to be incorporated by reference into the registration statement on Form F-3 (Registration No. 333-276216) (including any prospectuses forming a part of such registration statement) and to be a part thereof from the date on which this report is furnished, to the extent not superseded by documents or reports subsequently filed or furnished.

EXHIBIT INDEX

Exhibit	Description of Exhibit
99.1	Press Release of MAC Copper Limited dated October 9, 2025.

SIGNATURES

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.

				MAC COPPER LIMITED
				(Registrant)
Date:		October 9, 2025		By:	/s/ Michael James McMullen
					Name:	Michael James McMullen
					Title:	Chief Executive Officer