Amentum Holdings, Inc. · NYSE:AMTM
Amentum Holdings, Inc. shareholders
As of Jun 30, 2026, 450 institutions reported holding Amentum Holdings, Inc., 86.1% of its shares. Largest: American Securities LLC, Invesco and BlackRock. New holders, exits, insiders and big stakes, each with its filing.
| Holder | Shares | % of Amentum Holdings, Inc. | Change | Filed |
|---|---|---|---|---|
| American Securities LLC | 45M | 18.4% | no change | Aug 26, 2026 |
| Invesco | 25M | 10.2% | +3.48M | Aug 14, 2026 |
| BlackRock | 17.9M | 7.3% | +65,701 | Aug 7, 2026 |
| Vanguard | 16M | 6.5% | +254K | Aug 13, 2026 |
| Primecap Management Co | 12.3M | 5.0% | +200K | Aug 14, 2026 |
| Fidelity | 5.68M | 2.3% | +101K | Aug 13, 2026 |
| Dimensional | 5.54M | 2.3% | +1.75M | Aug 11, 2026 |
| State Street | 5.15M | 2.1% | +72,731 | Aug 7, 2026 |
| Frontier Capital Management Co LLC | 4.14M | 1.7% | −786K | Aug 14, 2026 |
| Troluce Capital Advisors LLC | 3.57M | 1.5% | held for review | Aug 14, 2026 |