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

Reporting relationship: Executive Chair, Director
Issuer ticker: AMTM
Reported as of: 06 Nov 2025
Net transaction value: $0
SEC form: 4/A - Amendment
Accepted by SEC: 10 Feb 2026, 16:09:03 UTC
Original report date: 10 Nov 2025
Prior SEC filing: 03 Oct 2025
Next SEC filing: 19 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Indira Lall, Attorney-in-fact

Key filing fact

Steven J. Demetriou filed Form 4/A - Amendment for Amentum Holdings, Inc. (AMTM) on 10 Feb 2026.

Key facts

This page summarizes Steven J. Demetriou's Form 4/A - Amendment filing for Amentum Holdings, Inc. (AMTM).
0 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 10 Feb 2026, 16:09.

Change

Previous filing in this sequence was filed on 03 Oct 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0001173003 Primary reporting owner

DEMETRIOU STEVEN J.

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

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AMTM holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 837,668
Date: 06 Nov 2025
Ownership: Direct
Footnotes: F1

AMTM holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 23,550
Date: 06 Nov 2025
Ownership: By Spouse

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote 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.