Jill L. Bruning - 17 Nov 2025 Form 4/A - Amendment Insider Report for Amentum Holdings, Inc. (AMTM)

Role: Chief Technology Officer
Signature: /s/ Mark Esposito, Attorney-in-Fact
Issuer symbol: AMTM
Transactions as of: 17 Nov 2025
Transactions value $: $0
Form type: 4/A - Amendment
Filing time: 19 Dec 2025, 18:47:14 UTC
Date Of Original Report: 19 Nov 2025
Previous filing: 10 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Bruning Jill L	Chief Technology Officer	C/O AMENTUM HOLDINGS, INC., 4800 WESTFIELDS BOULEVARD, SUITE 400, CHANTILLY	/s/ Mark Esposito, Attorney-in-Fact	19 Dec 2025	0002037037

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	AMTM	Common Stock						221K	17 Nov 2025	Direct	F1

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

Explanation of Responses:

Id	Content
F1	This Form 4/A is being filed solely to report the correct holding in Table I. It reflects a non-reportable transaction for shares transferred from the pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction.