Steven J. Demetriou - 06 Nov 2025 Form 4/A - Amendment Insider Report for Amentum Holdings, Inc. (AMTM)

Role: Executive Chair, Director
Signature: /s/ Indira Lall, Attorney-in-fact
Issuer symbol: AMTM
Transactions as of: 06 Nov 2025
Net transactions value: $0
Form type: 4/A - Amendment
Filing time: 10 Feb 2026, 16:09:03 UTC
Date Of Original Report: 10 Nov 2025
Previous filing: 03 Oct 2025
Next filing: 19 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
DEMETRIOU STEVEN J.	Executive Chair, Director	C/O AMENTUM HOLDINGS, INC., 4800 WESTFIELDS BOULEVARD, SUITE 400, CHANTILLY	/s/ Indira Lall, Attorney-in-fact	10 Feb 2026	0001173003

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	AMTM	Common Stock						837,668	06 Nov 2025	Direct	F1
holding	AMTM	Common Stock						23,550	06 Nov 2025	By Spouse

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

Explanation of Responses:

Id	Content
F1	Reflects a non-reportable transaction for shares transferred from the pro-rata distribution in-kind by Jacobs Solutions Inc. to its shareholders for no consideration on May 30, 2025.