Arnette Stephen A 4
4 · Amentum Holdings, Inc. · Filed Mar 4, 2026
Insider Transaction Report
Form 4
Arnette Stephen A
Chief Operating Officer
Transactions
- Exercise/Conversion
Common Stock
[F1]2026-03-02+2,808→ 97,107 total - Tax Payment
Common Stock
[F2]2026-03-02$30.70/sh−750$23,025→ 96,357 total - Exercise/Conversion
Restricted Stock Units
[F3][F4]2026-03-02−2,808→ 0 total→ Common Stock (2,808 underlying)
Footnotes (4)
- [F1]Represents distribution of AMTM common stock upon vesting of restricted stock units.
- [F2]Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units.
- [F3]Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.
- [F4]The restricted stock units awarded vested on March 2, 2026.
Signature
/s/ Michele T. St. Mary, Attorney-in-Fact|2026-03-04