John C. Vollmer - 06 Feb 2026 Form 4 Insider Report for Amentum Holdings, Inc. (AMTM)

Reporting relationship: Director
Issuer ticker: AMTM
Reported as of: 06 Feb 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 10 Feb 2026, 16:05:59 UTC
Prior SEC filing: 10 Apr 2025
Source filing: View source filing
Reporting owner signature: /s/ Indira Lall, Attorney-in-fact

Key filing fact

John C. Vollmer filed Form 4 for Amentum Holdings, Inc. (AMTM) on 10 Feb 2026.

Key facts

This page summarizes John C. Vollmer's Form 4 filing for Amentum Holdings, Inc. (AMTM).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 10 Feb 2026, 16:05.

Change

Previous filing in this sequence was filed on 10 Apr 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 disclosures.

View source filing

Reporting Owners (1)

CIK 0001723342 Primary reporting owner

Vollmer John C.

Relationship: 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 transaction

Common Stock

Options Exercise

Transaction value
Shares: +11,564
Change %: +2.8%
Price
Shares after: 424,780
Date: 06 Feb 2026
Ownership: Direct
Footnotes: F1, F2

AMTM transaction

Common Stock

Award

Transaction value: $0
Shares: +5,062
Change %: +1.2%
Price: $0.000000
Shares after: 429,842
Date: 06 Feb 2026
Ownership: Direct
Footnotes: F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AMTM transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value: $0
Shares: -11,564
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 06 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 11,564
Exercise price
Footnotes: F4, F5

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

Represents distribution of AMTM common stock upon vesting of restricted stock units.

Footnote F2

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.

Footnote F3

The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

Footnote F4

Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

Footnote F5

The restricted stock units awarded vested on February 6, 2026.