MAC Partners LLC - 11 Mar 2026 Form 3 Insider Report for Metals Acquisition Corp. II (MTAL)

Role: Director, 10%+ Owner
Signature: /s/ Jordan Leon, Attorney-in-Fact
Issuer symbol: MTAL
Transactions as of: 11 Mar 2026
Net transactions value: $0
Form type: 3
Filing time: 11 Mar 2026, 19:14:06 UTC
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
MAC Partners LLC	Director, 10%+ Owner	C/O MAPLES CORPORATE SERVICES LIMITED, PO BOX 309, UGLAND HOUSE, GEORGE TOWN, CAYMAN ISLANDS	/s/ Jordan Leon, Attorney-in-Fact	11 Mar 2026	0002108982

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	MTAL	Class B Ordinary Shares							11 Mar 2026	Class A Ordinary Shares	7,666,667		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The Class B ordinary shares are convertible for the Issuer's Class A ordinary shares as described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-293143) (the "Registration Statement") and have no expiration date. The Class B ordinary shares beneficially owned by the Reporting Person include up to 1,000,000 Class B ordinary shares subject to forfeiture to the Issuer depending on the extent to which the underwriters' over-allotment option is exercised in connection with the Issuer's initial public offering of units, as described in the Registration Statement.
F2	This Form 3 is being filed by MAC Partners LLC (the "Sponsor"). The Sponsor is governed by a board of managers consisting of three managers, Michael James McMullen, Morne Engelbrecht and Christopher Patrick Rosario. Any action by the Sponsor with respect to the Issuer's securities held by it, including voting and dispositive decisions, requires at least a majority vote of the managers of the board of managers. Under the so-called "rule of three," because voting and dispositive decisions are made by a majority of the managers, none of the managers is deemed to be a beneficial owner of Issuer's securities held by the Sponsor, even those in which such manager holds a pecuniary interest. Accordingly, none of the managers on the Sponsor's board of managers is deemed to have or share beneficial ownership of the Class B Ordinary Shares held by the Sponsor.

Content

The Class B ordinary shares are convertible for the Issuer's Class A ordinary shares as described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-293143) (the "Registration Statement") and have no expiration date. The Class B ordinary shares beneficially owned by the Reporting Person include up to 1,000,000 Class B ordinary shares subject to forfeiture to the Issuer depending on the extent to which the underwriters' over-allotment option is exercised in connection with the Issuer's initial public offering of units, as described in the Registration Statement.

This Form 3 is being filed by MAC Partners LLC (the "Sponsor"). The Sponsor is governed by a board of managers consisting of three managers, Michael James McMullen, Morne Engelbrecht and Christopher Patrick Rosario. Any action by the Sponsor with respect to the Issuer's securities held by it, including voting and dispositive decisions, requires at least a majority vote of the managers of the board of managers. Under the so-called "rule of three," because voting and dispositive decisions are made by a majority of the managers, none of the managers is deemed to be a beneficial owner of Issuer's securities held by the Sponsor, even those in which such manager holds a pecuniary interest. Accordingly, none of the managers on the Sponsor's board of managers is deemed to have or share beneficial ownership of the Class B Ordinary Shares held by the Sponsor.

Remarks:

See Exhibit 24.1 - Powers of Attorney.