| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| ASP Amentum Investco LP | 18.04% | 43.9M | 0 | 43.9M | /s/ Eric L. Schondorf | By: ASP Manager Corp., its general partner; Eric L. Schondorf / Vice President | |
| ASP Manager Corp. | 18.04% | 43.9M | 0 | 43.9M | /s/ Eric L. Schondorf | Eric L. Schondorf / Vice President | 0001621183 |
| American Securities LLC | 18.04% | 43.9M | 0 | 43.9M | /a/ Michael G. Fisch | Michael G. Fisch / Managing Member | 0001475483 |