Amentum Holdings, Inc. AMTM
22.33 USD -0.05 (-0.24%)
Nov 4, 2026, 2:31 PM EST
21.57 Day range 22.58
17.72 52-week range 38.11
- YTD
- -23.01%
- 1 year
- +1.72%
Held by funds
153 US ETFs and mutual funds hold AMTM · largest positions
Ownership
Held by insiders 1.17%
Held by institutions 105.43%
Float held by institutions 106.68%
Institutions 608
Top institutional holders
| Holder | % held | Shares | Value | Reported |
|---|---|---|---|---|
| American Securities LLC | 18.42% | 45,026,743 | 1.01B | Jun 29, 2026 |
| Invesco Ltd. | 10.21% | 24,954,251 | 558.23M | Jun 29, 2026 |
| Blackrock Inc. | 7.32% | 17,906,984 | 400.58M | Jun 29, 2026 |
| Primecap Management Company | 5.02% | 12,285,504 | 274.83M | Jun 29, 2026 |
| Vanguard Portfolio Management LLC | 3.25% | 7,948,385 | 177.81M | Jun 29, 2026 |
| Vanguard Capital Management LLC | 2.75% | 6,711,987 | 150.15M | Jun 29, 2026 |
Top mutual fund holders
| Holder | % held | Shares | Value | Reported |
|---|---|---|---|---|
| iShares Trust-iShares Core S&P Small-Cap ETF | 3.75% | 9,171,825 | 205.17M | Sep 29, 2026 |
| VANGUARD FENWAY FUNDS-Vanguard PRIMECAP Core Fund | 2.26% | 5,516,796 | 123.41M | Jun 29, 2026 |
| VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund | 1.90% | 4,653,337 | 104.10M | Jun 29, 2026 |
| AIM Sector Funds (Invesco Sector Funds)-Invesco Small Cap Value Fund | 1.73% | 4,226,948 | 94.56M | Jul 30, 2026 |
| VANGUARD INDEX FUNDS-Vanguard Small-Cap Index Fund | 1.38% | 3,363,425 | 75.24M | Jun 29, 2026 |
| AIM Sector Fd.s -INVESCO VALUE OPPORTUNITIES Fd. | 1.20% | 2,945,078 | 65.88M | Jul 30, 2026 |
Insiders
| Insider | Relation | Latest transaction | Date | Shares held |
|---|---|---|---|---|
| AMENTUM JOINT VENTURE GP LLC | Director | Stock Award(Grant) | Apr 6, 2025 | 0 |
| ARNETTE STEPHEN A | Chief Operating Officer | Conversion of Exercise of derivative security | May 5, 2026 | 106,652 |
| BRUNING JILL L | Chief Technology Officer | Conversion of Exercise of derivative security | May 5, 2026 | 197,457 |
| DEMETRIOU STEVEN J | Officer and Director | Stock Award(Grant) | Nov 16, 2025 | 844,026 |
| EBERHART RALPH EDWARD | Director | Conversion of Exercise of derivative security | Mar 4, 2025 | 29,886 |
| HELLER JOHN E | Chief Executive Officer | Conversion of Exercise of derivative security | May 5, 2026 | 376,019 |