Amentum (AMTM)
Delivers digital and engineering services for U.S. and allied government missions.
$19.70
After hours−0.02 (−0.10%)
At close$19.72(−0.90%)
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13F · 13D/G · Form 4
| Institutions | ≈ 89.66% | 219.05M shares | |
|---|---|---|---|
| 488 holders · as of Jun 30, 2026 · largest filers plus last quarter's tail | |||
| Insiders | 0.92% | 2.26M shares | |
| 15 holders · as of Sep 17, 2026 | |||
| Other | ≈ 9.42% | 23.01M shares | |
| remainder | |||
244.32M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.
13F, as of Jun 30, 2026
488 holders · 219.05M shares · 62 new positions · 209 increased · 162 reduced · 82 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| American Securities LLC | 45.03M | 18.43% | 0 | Aug 26, 2026 |
| Invesco Ltd. | 24.95M | 10.21% | +3.48M | Aug 14, 2026 |
| BlackRock, Inc. | 17.91M | 7.33% | +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 | 3.25% | +95.4K | Aug 13, 2026 |
| Vanguard Capital Management LLC | 6.71M | 2.75% | +61.1K | Aug 13, 2026 |
| FMR LLC | 5.68M | 2.32% | +100.8K | Aug 13, 2026 |
13D/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 |
Form 4
Latest trades
No open-market trades in the last 12 months.
House and Senate disclosures
Not reported.