Form: 3

Initial statement of beneficial ownership of securities

March 18, 2026

SEC Form 3
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES


Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
OBrien Damien

(Last) (First) (Middle)
56, RUE CHARLES MARTEL

(Street)
LUXEMBOURG N4 L-2134

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026
3. Issuer Name and Ticker or Trading Symbol
Ardagh Metal Packaging S.A. [ AMBP ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) Other (specify below)
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares 63,356 D
Ordinary Shares 243,750 I By Tregoyd Pty Ltd(1)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
1. Represents Ordinary Shares owned by Tregoyd Pty Ltd. All shares issued by Tregoyd Pty Ltd are beneficially owned by Anglesea Investments Pty Ltd, in its capacity as trustee for the Damien O'Brien Family Trust (the "Trust"). The Reporting Person is the sole director of the Trust and retains 100% control over Tregoyd Pty Ltd and Anglesea Investments Pty Ltd.
Remarks:
(1) Torsten Schoen is signing on behalf of the Reporting Person pursuant to the power of attorney dated February 24, 2026, which is attached hereto as an exhibit. Exhibit 24.1 - Power of Attorney.
/s/ Torsten Schoen, as Attorney-in-Fact on behalf of Damien O'Brien 03/18/2026
** Signature of Reporting Person Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.