Amentum HoldingsAMTM
13F holders, Q3 2025 (September 30)462holders +2
74new positions
69sold out
8famous investors
$23.95avg. 13F price*
At the end of Q3 2025, 462 institutions reported holding Amentum Holdings Inc. (AMTM) in their 13F filings, up 2 from Q2 2025. 74 opened new positions and 69 sold out. The largest holders were American Securities LLC ($1.1B), Invesco Ltd. ($529.7M) and BlackRock, Inc. ($430.9M). 8 famous investors held it, including Steve Cohen (0.1% of Point72 Asset Management's portfolio), Joel Greenblatt (0.0% of Gotham Asset Management's portfolio) and Mario Gabelli (0.0% of GAMCO Investors's portfolio).
- Company
- Amentum Holdings Inc.
- CUSIP
- 023939101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 74 | $80.7M |
| Exits | 69 | $69.6M |
All 13F filers, Q2 2025 → Q3 2025: 14,349,973 shares bought and 19,107,691 shares sold, net −4,757,718 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 462 holders
| American Securities LLC | 100.00% | No change | 45,026,743 | $1.1B |
| Invesco Ltd. | 0.08% | Add +13.0% | 22,116,835 | $529.7M |
| BlackRock, Inc. | 0.01% | Reduce -5.3% | 17,990,449 | $430.9M |
| Vanguard Group Inc. | 0.01% | Reduce -5.9% | 15,554,691 | $372.5M |
| Primecap Management Co. | 0.22% | Reduce -0.9% | 11,918,586 | $285.5M |
| State Street Corp. | 0.01% | Reduce -3.5% | 6,833,376 | $163.7M |
| FMR LLC | 0.01% | Add +36.3% | 6,235,249 | $149.3M |
| Frontier Capital Management Co. LLC | 1.12% | Reduce -4.7% | 5,202,680 | $124.6M |
| NorthCoast Asset Management LLC | 0.28% | Add +0.2% | 3,007,750 | $72.0M |
| Thompson Siegel & Walmsley LLC | 1.06% | Reduce -2.0% | 2,730,298 | $65.4M |
| Geode Capital Management, LLC | 0.00% | Add +5.6% | 2,654,184 | $63.6M |
| Ruane, Cunniff & Goldfarb L.P. | 0.96% | Reduce -0.7% | 2,423,748 | $58.0M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.08% | Add +50.9% | 2,081,611 | $49.9M |
| Freestone Grove Partners LP | 0.37% | No change | 2,051,859 | $49.1M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +5.6% | 1,842,171 | $44.1M |
| Morgan Stanley | 0.00% | Reduce -17.0% | 1,806,417 | $43.3M |
| Thrivent Financial for Lutherans | 0.09% | Add +7.0% | 1,805,411 | $43.2M |
| Arvin Capital Management LP | 9.07% | Reduce -23.5% | 1,636,492 | $39.2M |
| FIL Ltd | 0.03% | Reduce -24.6% | 1,559,024 | $37.3M |
| Point72 Asset Management | 0.08% | Add +293.9% | 1,380,992 | $33.1M |
| Dimensional Fund Advisors LP | 0.01% | Reduce -2.1% | 1,306,051 | $31.3M |
| 683 Capital Management, LLC | 2.91% | Reduce -21.8% | 1,275,000 | $30.5M |
| Brightline Capital Management, LLC | 11.78% | Add +20.0% | 1,200,000 | $28.7M |
| Discovery Capital Management, LLC / CT | 1.51% | Reduce -50.5% | 1,139,112 | $27.3M |
| Verition Fund Management LLC | 0.16% | Add +1128.0% | 1,135,626 | $27.2M |
| Voya Investment Management LLC | 0.03% | Add +66.5% | 1,084,969 | $26.0M |
| Loomis Sayles & Co. L P | 0.03% | Add +0.5% | 1,064,079 | $25.5M |
| Penn Capital Management Company, LLC | 1.77% | Reduce -4.3% | 960,607 | $23.1M |
| Northern Trust Corp. | 0.00% | Add +0.2% | 942,945 | $22.6M |
| Bank of New York Mellon Corp | 0.00% | Reduce -0.2% | 866,263 | $20.7M |
| Avenir Corp. | 2.15% | Reduce -3.7% | 862,453 | $20.7M |
| Goldman Sachs Group Inc. | 0.00% | Add +240.8% | 811,931 | $19.4M |
| Cacti Asset Management LLC | 1.27% | Add +1.0% | 857,092 | $19.3M |
| Bank of America Corp. | 0.00% | Reduce -8.0% | 798,437 | $19.1M |
| Van Eck Associates Corp. | 0.02% | Reduce -75.0% | 765,677 | $18.3M |
| Nuveen, LLC | 0.00% | Add +45.4% | 751,304 | $18.0M |
| Principal Financial Group Inc. | 0.01% | Reduce -1.2% | 735,755 | $17.6M |
| New York State Common Retirement Fund | 0.02% | Reduce -5.0% | 659,080 | $15.8M |
| Millennium Management | 0.01% | Reduce -86.3% | 640,799 | $15.3M |
| Voss Capital, LP | 0.86% | Reduce -55.4% | 625,000 | $15.0M |
| Public Sector Pension Investment Board | 0.05% | Add +16.3% | 597,976 | $14.3M |
| BW Gestao de Investimentos Ltda. | 0.93% | Reduce -28.5% | 511,477 | $12.2M |
| Vident Advisory, LLC | 0.11% | Add +5.2% | 454,704 | $10.9M |
| Royce & Associates LP | 0.11% | Add +35.7% | 454,500 | $10.9M |
| CI Investments Inc. | 0.04% | Reduce -5.8% | 428,271 | $10.3M |
| Hyperion Capital Advisors LP | 5.38% | Add +715.8% | 420,008 | $10.1M |
| Segra Capital Management, LLC | 11.55% | New | 417,025 | $10.0M |
| Aristotle Capital Boston, LLC | 0.51% | Reduce -3.3% | 409,143 | $9.8M |
| Moore Capital Management, LP | 0.20% | Reduce -33.3% | 407,417 | $9.8M |
| Two Sigma Investments, LP | 0.02% | Add +2807.2% | 399,123 | $9.6M |
| Legal & General Group Plc | 0.00% | Reduce -4.0% | 388,289 | $9.3M |
| Ameriprise Financial Inc. | 0.00% | Add +3.8% | 355,946 | $8.5M |
| Comerica Bank | 0.03% | Reduce -13.6% | 312,639 | $7.5M |
| CenterBook Partners LP | 0.36% | Add +145.8% | 308,081 | $7.4M |
| Swiss National Bank | 0.00% | Add +1.4% | 306,491 | $7.3M |
| Jane Street Group, LLC | 0.01% | New | 301,261 | $7.2M |
| Rhumbline Advisers | 0.01% | Add +0.9% | 289,818 | $6.9M |
| Russell Investments Group, Ltd. | 0.01% | Reduce -11.8% | 289,549 | $6.9M |
| Grizzlyrock Capital, LLC | 5.27% | Add +11.7% | 283,113 | $6.8M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -35.5% | 277,897 | $6.7M |
| Hotchkis & Wiley Capital Management LLC | 0.02% | New | 268,130 | $6.4M |
| Exchange Traded Concepts, LLC | 0.06% | Add +7928.0% | 267,494 | $6.4M |
| Trexquant Investment LP | 0.06% | New | 255,748 | $6.1M |
| Gotham Asset Management | 0.03% | New | 244,826 | $5.9M |
| Royal Bank of Canada | 0.00% | Reduce -45.4% | 242,056 | $5.8M |
| AWH Capital, L.P. | 5.88% | Add +42.4% | 235,250 | $5.6M |
| California Public Employees Retirement System | 0.00% | Add +1.4% | 232,009 | $5.6M |
| UBS Group AG | 0.00% | Reduce -69.8% | 231,190 | $5.5M |
| Twinbeech Capital LP | 0.21% | New | 222,707 | $5.3M |
| Algert Global LLC | 0.09% | Add +828.0% | 221,610 | $5.3M |
| CSM Advisors, LLC | 0.14% | Reduce -68.0% | 202,807 | $4.9M |
| Sei Investments Co. | 0.01% | Reduce -8.5% | 200,523 | $4.8M |
| Telos Capital Management, Inc. | 0.44% | Reduce -14.0% | 189,859 | $4.5M |
| HRT Financial LP | 0.02% | New | 186,223 | $4.5M |
| Hudson Value Partners, LLC | 1.40% | Add +0.1% | 185,825 | $4.5M |
| Alliancebernstein L.P. | 0.00% | Reduce -51.3% | 169,726 | $4.1M |
| AQR Capital Management | 0.00% | Reduce -52.8% | 165,205 | $4.0M |
| Country Club Bank | 0.23% | Add +0.1% | 172,462 | $3.9M |
| California State Teachers Retirement System | 0.00% | Add +0.0% | 162,330 | $3.9M |
| Two Sigma Advisers, LP | 0.01% | New | 159,168 | $3.8M |
| Wealth Enhancement Advisory Services, LLC | 0.01% | Reduce -3.1% | 150,345 | $3.8M |
| Soviero Asset Management, LP | 2.29% | Add +40.9% | 155,000 | $3.7M |
| Prudential Financial Inc. | 0.00% | Reduce -1.9% | 147,198 | $3.5M |
| Atom Investors LP | 0.26% | New | 144,281 | $3.5M |
| New York State Teachers Retirement System | 0.01% | Add +2.5% | 140,918 | $3.4M |
| Raymond James Financial Inc. | 0.00% | Reduce -26.6% | 139,403 | $3.3M |
| Ancora Advisors LLC | 0.06% | Add +1.3% | 133,874 | $3.2M |
| Engineers Gate Manager LP | 0.03% | New | 125,542 | $3.0M |
| State Board of Administration of Florida Retirement System | 0.01% | Reduce -1.2% | 120,865 | $2.9M |
| T. Rowe Price Associates Inc. | 0.00% | Add +11.3% | 118,175 | $2.8M |
| Citadel Advisors | 0.00% | Reduce -65.6% | 117,970 | $2.8M |
| ExodusPoint Capital Management, LP | 0.04% | Add +983.4% | 106,188 | $2.5M |
| JPMorgan Chase & Co. | 0.00% | Add +14.7% | 104,771 | $2.5M |
| GAMCO Investors | 0.02% | Reduce -8.3% | 99,643 | $2.4M |
| North Growth Management Ltd. | 0.40% | No change | 97,000 | $2.3M |
| Dark Forest Capital Management LP | 0.09% | New | 95,866 | $2.3M |
| State of Wisconsin Investment Board | 0.01% | Reduce -0.5% | 91,398 | $2.2M |
| LPL Financial LLC | 0.00% | Reduce -0.0% | 90,728 | $2.2M |
| Envestnet Asset Management Inc. | 0.00% | Reduce -7.4% | 89,590 | $2.1M |
| State of New Jersey Common Pension Fund D | 0.01% | Reduce -12.4% | 87,642 | $2.1M |
"% of holder's portfolio" is AMTM's weight in each manager's 13F, not the share of Amentum Holdings Inc. the manager owns.