Key facts
- This page summarizes Stephen A. Arnette's Form 4 filing for Amentum Holdings, Inc. (AMTM).
- 3 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 07 May 2026, 16:29.
Stephen A. Arnette - 06 May 2026 Form 4 Insider Report for Amentum Holdings, Inc. (AMTM)
- Reporting relationship
- Chief Operating Officer
- Issuer ticker
- AMTM
- Reported as of
- 06 May 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 07 May 2026, 16:29:07 UTC
- Prior SEC filing
- 04 Mar 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Indira Lall, Attorney-in-Fact
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Stephen A. Arnette filed Form 4 for Amentum Holdings, Inc. (AMTM) on 07 May 2026.
Change
- Previous filing in this sequence was filed on 04 Mar 2026.
- 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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001919492
Primary reporting owner
Arnette Stephen A
- Relationship
- Chief Operating Officer
- Address
- C/O AMENTUM HOLDINGS, INC., 4800 WESTFIELDS BOULEVARD, SUITE 400, CHANTILLY
- Signature
- /s/ Indira Lall, Attorney-in-Fact
- Signature date
- 07 May 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
- +13,609
- Change %
- +14%
- Price
- Shares after
- 109,966
- Date
- 06 May 2026
- Ownership
- Direct
- Footnotes
- F1
AMTM
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -3,314
- Change %
- -3%
- Price
- $24.89*
- Shares after
- 106,652
- Date
- 06 May 2026
- Ownership
- Direct
- Footnotes
- F2
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
- Shares
- -13,609
- Change %
- -50%
- Price
- $0.000000*
- Shares after
- 13,609
- Date
- 06 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 13,609
- Exercise price
- Footnotes
- F3, F4
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 4 footnotes
Footnote F1
Represents distribution of AMTM common stock upon vesting of restricted stock units.
Footnote F2
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units.
Footnote F3
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.
Footnote F4
One-half of the restricted stock units shall vest and be delivered on the 18th month and three-year anniversaries of the date of grant.