# EDGAR Filing Document

**Accession Number:** 0001950246
**File Stem:** 0001104659-25-101991
**Filing Date:** 2025-10
**Character Count:** 5606
**Document Hash:** 2a5172ea125fcd3682c236568597befc
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-101991.hdr.sgml**: 20251024

**ACCESSION NUMBER**: 0001104659-25-101991

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 5

**CONFORMED PERIOD OF REPORT**: 20251024

**FILED AS OF DATE**: 20251024

**DATE AS OF CHANGE**: 20251024

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MAC Copper Ltd
- **CENTRAL INDEX KEY:** 0001950246
- **STANDARD INDUSTRIAL CLASSIFICATION:** METAL MINING [1000]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** Y9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41722
- **FILM NUMBER:** 251414288

**BUSINESS ADDRESS:**
- **STREET 1:** 3RD FLOOR
- **STREET 2:** 44 ESPLANADE, ST
- **CITY:** ST. HELIER
- **STATE:** Y9
- **ZIP:** JE4 9WG
- **BUSINESS PHONE:** 8176989901

**MAIL ADDRESS:**
- **STREET 1:** 3RD FLOOR
- **STREET 2:** 44 ESPLANADE, ST
- **CITY:** ST. HELIER
- **STATE:** Y9
- **ZIP:** JE4 9WG

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Metals Acquisition Ltd
- **DATE OF NAME CHANGE:** 20221011

**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**

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

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| |
|:---|
| **MAC COPPER LIMITED** |
| (Translation of registrant's name into English) |
| **3rd Floor, 44 Esplanade**<br> **St. Helier, Jersey, JE4 9WG**<br> **Tel: +(817) 698-9901** |
| (Address of principal executive offices) |

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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 ¨

**EXHIBIT INDEX**

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| | |
|:---|:---|
| **Exhibit** | **Description of Exhibit** |
| [99.1](tm2529150d1_ex99-1.htm) | [Press Release of MAC Copper Limited dated October 24, 2025.](tm2529150d1_ex99-1.htm) |

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**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.

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| |
|:---|
| **MAC COPPER LIMITED** |
| (Registrant) |

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| | | | | |
|:---|:---|:---|:---|:---|
| Date: | October 24, 2025 | By: | /s/ Michael James McMullen | /s/ Michael James McMullen |
|  |  |  | Name: | Michael James McMullen |
|  |  |  | Title: | Chief Executive Officer |

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## Exhibit 99.1

**Exhibit 99.1**

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| | |
|:---|:---|
| ![](tm2529150d1_ex99-1img001.jpg) | ![](tm2529150d1_ex99-1img002.jpg) |

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24 October 2025

**Implementation of Scheme with Harmony**

ST. HELIER, Jersey – (BUSINESS WIRE) – MAC Copper Limited ARBN 671 963 198 (NYSE:MTAL; ASX:MAC)

MAC Copper Limited (NYSE:MTAL, ASX:MAC) ("**MAC**" or the "**Company**") is pleased to announce that the acquisition of 100% of the issued share capital in MAC by Harmony Gold (Australia) Pty Ltd (a wholly owned subsidiary of Harmony Gold Mining Company Limited (JSE:HAR, NYSE:HMY)) ("**Harmony**") by way of a Jersey law scheme of arrangement pursuant to Article 125 of the Companies (Jersey) Law 1991 (as amended) ("**Scheme**") has today been implemented.

Capitalised terms used in this announcement have the meaning given to them in the Scheme Circular, a copy of which is attached to MAC's announcement released on 31 July 2025.

**Transfer of MAC Shares**

All MAC Shares (including MAC Shares underlying MAC CDIs) have today been transferred to Harmony.

**Payment of Scheme Consideration**

MAC Securityholders who held MAC Shares or MAC CDIs at the Scheme Record Date, being 7:00 pm (Sydney time) on 17 October 2025 (for MAC CDI Holders) or 5:00 pm (New York time) on 17 October 2025 (for Scheme Shareholders) will be paid the Scheme Consideration in accordance with the terms of the Scheme and the post-implementation timetable set out below.

**Delisting**

The delisting of MAC Shares from the NYSE is anticipated to complete today, and the delisting of MAC from the ASX is anticipated to take effect by no later than the close of trading on 3 November 2025.

**Post-implementation timetable**

The remaining key dates expected for the Scheme are set out below.

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| | |
|:---|:---|
| &nbsp;&nbsp;**Event** | &nbsp;&nbsp;**Date and time (Jersey time)** |
| &nbsp;&nbsp;Consideration payment date to DTC for further payment by DTC participants to beneficial owners holding MAC Shares within DTC | &nbsp;&nbsp;27 October 2025 |
| &nbsp;&nbsp;Consideration payment date for MAC Shares held outside DTC | &nbsp;&nbsp;31 October 2025 |
| &nbsp;&nbsp;Consideration payment date for MAC CDIs | &nbsp;&nbsp;31 October 2025 |
| &nbsp;&nbsp;Delisting of MAC from the ASX | &nbsp;&nbsp;3 November 2025 |

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**Further information**

If, after reading the Scheme Circular, you have any questions about the payment of the Scheme Consideration, please contact MAC's Share Registry or CDI Registry (as applicable), at:

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| | |
|:---|:---|
| **If you are a MAC Shareholder**<br> Call toll-free in US: <br> +1 (800) 662-5200<br> Outside of US: <br> +1 (203) 658-9400 | **If you are a MAC CDI Holder**<br> Within Australia: <br> 1300 229 418<br> Outside Australia: <br> +61 2 9066 4059 |

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| | | | |
|:---|:---|:---|:---|
| ![](tm2529150d1_ex99-1img003.jpg) | **MAC Copper Limited**<br> maccopperlimited.com | 3rd Floor, 44 Esplanade,<br> St Helier, Jersey, JE4 | Page 1 |

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