Amentum
Delivers digital and engineering services for U.S. and allied government missions.
$20.40
After-hours close+0.06 (+0.29%)
At close$20.34(−0.44%)
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Breakdown13F · Form 4
Institutions 92.07%Insiders 19.31%
Institutions and insiders are filed separately and overlap, so together they can pass the whole company. No split is drawn from them.
Shares outstanding 244.09M · Float 196.90M · 80.7% free float
Institutions13F, as of Jun 30, 2026
483 holders · 224.72M shares · 63 new positions · 209 increased · 158 reduced · 87 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| American Securities LLC | 45.03M | 18.45% | 0 | Aug 26, 2026 |
| Invesco Ltd. | 24.95M | 10.22% | +3.48M | Aug 14, 2026 |
| BlackRock, Inc. | 17.91M | 7.34% | +65.7K | Aug 7, 2026 |
| Primecap Management Co/CA/ | 12.29M | 5.03% | +200.2K | Aug 14, 2026 |
| Legacy Advisors, LLC | 9.07M | 3.71% | +1.4K | Jul 24, 2026 |
| Vanguard Portfolio Management LLC | 7.95M | 3.26% | +95.4K | Aug 13, 2026 |
| Vanguard Capital Management LLC | 6.71M | 2.75% | +61.1K | Aug 13, 2026 |
| FMR LLC | 5.68M | 2.33% | +100.8K | Aug 13, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Amentum Joint Venture LPincl. Amentum Joint Venture GP LLC | 37.00% | 90.02M | 13D | Oct 4, 2024 ↗ |
| Invesco Ltd. | 10.10% | 24.53M | 13G | May 7, 2026 ↗ |
| Jacobs Engineering Group Inc.incl. Jacobs Solutions Inc. | 7.50% | 18.25M | 13G | Nov 12, 2024 ↗ |
| BlackRock, Inc. | 6.90% | 16.77M | 13G | Feb 5, 2025 ↗ |
| Primecap Management Co/CA/ | 5.03% | 12.29M | 13G | Aug 6, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Alan E. Goldberg | director, 10 percent owner: | 45.03M | 18.45% | May 12, 2025 |
| Steven J. Demetriou | director, officer: Executive Chair | 709.1K | 0.29% | Nov 19, 2025 |
| John C. Vollmer | director | 424.8K | 0.17% | Feb 10, 2026 |
| John E. Heller | director, officer: Chief Executive Officer | 376.0K | 0.15% | May 7, 2026 |
| Jill L. Bruning | officer: Chief Technology Officer | 197.5K | 0.08% | May 7, 2026 |
| Travis Barton Johnson | officer: Chief Financial Officer | 118.2K | 0.05% | May 7, 2026 |
| Stephen A. Arnette | officer: Chief Operating Officer | 106.7K | 0.04% | May 7, 2026 |
| Ralph E. Eberhart | director | 43.1K | 0.02% | Feb 10, 2026 |
| Sean Thomas Mullen | officer: Chief Growth Officer | 32.4K | 0.01% | May 7, 2026 |
| Mary Michele T. St. | officer: Chief Legal Officer & GC | 27.0K | 0.01% | Feb 18, 2026 |
2 ten-percent owners hold 87.79M shares by Form 4, outside the officers-and-directors figure above
Latest trades
No open-market trades in the last 12 months.
CongressHouse and Senate disclosures
Not reported.