SEC Form 4 · accession 0001483410-26-000005
Amentum Holdings, Inc. · AMTM
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Christopher M.T. Thompson
Director
Period of report
Aug 14, 2026
Accepted (ET)
Sep 17, 2026 · 9:35 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0002011286
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF1,F2 | Aug 14, 2026 | G | 4,250 | $0.00 | D | 5,750 | I | By Trust |
| Common Stock | holding | — | — | — | 5,062 | D | ||
| Common Stock | holding | — | — | — | 14,000 | I | By Spouse |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1Mr. Thompson's filing was late due to an administrative oversight.
- F2On August 14, 2026, the reporting person transferred an LLC interest representing 4,250 shares of AMTM common stock to an immediate family for no consideration.