Exhibit 99.1

Joint Filing Agreement

The undersigned acknowledge and agree that the Schedule 13G with respect to beneficial ownership by the undersigned of ordinary shares, with a nominal value of €0.01 per share, of Ardagh Metal Packaging S.A. filed on or about the date hereof is being filed on behalf of each of the undersigned in accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, and that all subsequent amendments to such Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. This agreement may be executed in any number of counterparts, each of which shall be deemed an original, but all of which counterparts taken together shall constitute one and the same instrument.

Date: November 19, 2025


	ARDAGH GROUP S.A.

	By:	/s/ Mark Porto
	Name:	Mark Porto
	Title:	Director

	By:	/s/ Herman Troskie
	Name:	Herman Troskie
	Title:	Director


	ARD HOLDINGS S.A.

	By:	/s/ Paul Coulson
	Name:	Paul Coulson
	Title:	Director

	By:	/s/ Gerald Moloney
	Name:	Gerald Moloney
	Title:	Director



	By:	/s/ Paul Coulson
	Name:	Paul Coulson

Ardagh Metal Packaging S.A. SCHEDULE 13G/A