| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Bruning Jill L | Chief Technology Officer | C/O AMENTUM HOLDINGS, INC., 4800 WESTFIELDS BOULEVARD, SUITE 400, CHANTILLY | /s/ Michele T. St. Mary, Attorney-in-Fact | 05 Mar 2026 | 0002037037 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | AMTM | Common Stock | Gift | -30,000 | -14% | $0.000000* | 190,999 | 04 Mar 2026 | Direct |