Amentum HoldingsAMTM
13F holders, Q1 2025 (March 31)418holders −33
67new positions
94sold out
4famous investors
$18.20avg. 13F price*
At the end of Q1 2025, 418 institutions reported holding Amentum Holdings Inc. (AMTM) in their 13F filings, down 33 from Q4 2024. 67 opened new positions and 94 sold out. The largest holders were American Securities LLC ($798.9M), BlackRock, Inc. ($332.1M) and Invesco Ltd. ($312.9M). 4 famous investors held it, including Ken Griffin (0.1% of Citadel Advisors's portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio).
- Company
- Amentum Holdings Inc.
- CUSIP
- 023939101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2024 → Q1 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 67 | $207.8M |
| Exits | 94 | $168.1M |
All 13F filers, Q4 2024 → Q1 2025: 41,243,026 shares bought and 14,747,653 shares sold, net +26,495,373 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 418 holders
| American Securities LLC | 100.00% | No change | 43,893,904 | $798.9M |
| BlackRock, Inc. | 0.01% | Add +8.8% | 18,248,989 | $332.1M |
| Invesco Ltd. | 0.06% | Add +24.1% | 17,191,110 | $312.9M |
| Vanguard Group Inc. | 0.01% | Reduce -1.2% | 16,342,560 | $297.4M |
| Primecap Management Co. | 0.15% | Add +56.9% | 10,061,589 | $183.1M |
| State Street Corp. | 0.00% | Add +1.9% | 6,576,351 | $119.7M |
| FMR LLC | 0.01% | Add +84.1% | 4,408,949 | $80.2M |
| Frontier Capital Management Co. LLC | 0.71% | New | 3,578,732 | $65.1M |
| Thompson Siegel & Walmsley LLC | 1.03% | Add +70.7% | 3,326,378 | $60.5M |
| NorthCoast Asset Management LLC | 0.28% | Reduce -2.4% | 3,075,305 | $56.0M |
| Citadel Advisors | 0.05% | Add +641.2% | 2,926,482 | $53.3M |
| Discovery Capital Management, LLC / CT | 5.82% | Add +465.4% | 2,630,930 | $47.9M |
| Van Eck Associates Corp. | 0.06% | Add +129.9% | 2,603,564 | $47.4M |
| Ruane, Cunniff & Goldfarb L.P. | 0.79% | Reduce -1.8% | 2,393,039 | $43.6M |
| Geode Capital Management, LLC | 0.00% | Add +17.1% | 2,299,997 | $41.9M |
| Voss Capital, LP | 3.10% | Add +393.7% | 2,220,709 | $40.4M |
| FIL Ltd | 0.04% | Add +23.2% | 2,209,313 | $40.2M |
| Morgan Stanley | 0.00% | Add +41.2% | 2,092,848 | $38.1M |
| Millennium Management | 0.04% | Add +68.1% | 2,011,792 | $36.6M |
| Balyasny Asset Management L.P. | 0.09% | New | 1,880,887 | $34.2M |
| Norges Bank | 0.00% | Add +19.2% | 1,716,506 | $31.2M |
| Arvin Capital Management LP | 11.34% | Add +74.8% | 1,687,149 | $30.7M |
| Thrivent Financial for Lutherans | 0.07% | Add +0.6% | 1,621,324 | $29.5M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +22.5% | 1,549,158 | $28.2M |
| UBS Group AG | 0.01% | Add +35.2% | 1,530,134 | $27.8M |
| Cooper Creek Partners Management LLC | 0.72% | Reduce -70.6% | 1,223,986 | $22.3M |
| Freestone Grove Partners LP | 0.22% | New | 1,164,835 | $21.2M |
| Dimensional Fund Advisors LP | 0.01% | Reduce -3.5% | 1,113,654 | $20.3M |
| Kopernik Global Investors, LLC | 2.03% | Add +40.7% | 1,077,495 | $19.6M |
| 683 Capital Management, LLC | 2.05% | Add +138.3% | 1,013,000 | $18.4M |
| Bank of America Corp. | 0.00% | Add +59.1% | 968,538 | $17.6M |
| Avenir Corp. | 1.73% | Add +367.3% | 904,162 | $16.5M |
| Penn Capital Management Company, LLC | 1.58% | Add +99.3% | 889,434 | $16.2M |
| Northern Trust Corp. | 0.00% | Add +1.4% | 854,423 | $15.6M |
| Cacti Asset Management LLC | 1.17% | Add +1.2% | 834,442 | $15.1M |
| Bank of New York Mellon Corp | 0.00% | Add +16.8% | 760,509 | $13.8M |
| Principal Financial Group Inc. | 0.01% | Add +18.3% | 712,172 | $13.0M |
| CSM Advisors, LLC | 0.63% | Reduce -0.2% | 638,057 | $11.6M |
| Ghisallo Capital Management LLC | 1.04% | New | 635,569 | $11.6M |
| Engine Capital Management, LP | 2.19% | Add +2.2% | 635,255 | $11.6M |
| Voya Investment Management LLC | 0.01% | Add +55.4% | 628,154 | $11.4M |
| New York State Common Retirement Fund | 0.02% | Add +61.4% | 611,787 | $11.1M |
| Jane Street Group, LLC | 0.02% | Add +2089.0% | 601,760 | $11.0M |
| Royal Bank of Canada | 0.00% | Reduce -5.9% | 582,195 | $10.6M |
| Loews Corp | 0.08% | New | 572,684 | $10.4M |
| Susquehanna International Group, LLP | 0.02% | Reduce -39.1% | 533,567 | $9.7M |
| Moore Capital Management, LP | 0.36% | Reduce -15.9% | 498,264 | $9.1M |
| Public Sector Pension Investment Board | 0.04% | Add +47.2% | 455,129 | $8.3M |
| Davidson Kempner Capital Management LP | 0.16% | New | 450,000 | $8.2M |
| Goldman Sachs Group Inc. | 0.00% | Add +64.4% | 447,578 | $8.1M |
| Aristotle Capital Boston, LLC | 0.41% | Reduce -6.4% | 446,612 | $8.1M |
| CI Investments Inc. | 0.03% | Reduce -31.0% | 443,581 | $8.1M |
| Loomis Sayles & Co. L P | 0.01% | New | 435,674 | $7.9M |
| CenterBook Partners LP | 0.48% | Add +481.4% | 414,574 | $7.5M |
| Arosa Capital Management LP | 4.92% | Add +16.3% | 406,900 | $7.4M |
| BW Gestao de Investimentos Ltda. | 0.81% | New | 394,400 | $7.2M |
| Legal & General Group Plc | 0.00% | Reduce -42.4% | 390,937 | $7.1M |
| Monashee Investment Management LLC | 0.79% | New | 360,000 | $6.6M |
| Ameriprise Financial Inc. | 0.00% | Reduce -7.7% | 331,597 | $6.0M |
| Rhumbline Advisers | 0.01% | Add +5.0% | 310,103 | $5.6M |
| Castalian Partners, LLC | 24.34% | Reduce -69.5% | 304,500 | $5.5M |
| Vident Advisory, LLC | 0.08% | Add +1818.7% | 292,857 | $5.3M |
| Verition Fund Management LLC | 0.03% | Reduce -9.4% | 290,706 | $5.3M |
| Nuveen, LLC | 0.00% | — | 287,801 | $5.2M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -0.2% | 273,283 | $5.0M |
| Swiss National Bank | 0.00% | Reduce -1.5% | 259,200 | $4.7M |
| Telos Capital Management, Inc. | 0.51% | Reduce -4.1% | 256,178 | $4.7M |
| Comerica Bank | 0.02% | Add +409.8% | 248,718 | $4.5M |
| Russell Investments Group, Ltd. | 0.01% | Add +85.5% | 232,933 | $4.2M |
| Twinbeech Capital LP | 0.07% | New | 225,438 | $4.1M |
| Sei Investments Co. | 0.00% | Reduce -29.6% | 202,150 | $3.7M |
| Hudson Value Partners, LLC | 1.29% | New | 188,283 | $3.4M |
| California Public Employees Retirement System | 0.00% | Reduce -4.9% | 187,848 | $3.4M |
| Raymond James Financial Inc. | 0.00% | Add +111.0% | 180,572 | $3.3M |
| Grizzlyrock Capital, LLC | 2.71% | New | 164,226 | $3.0M |
| Wealth Enhancement Advisory Services, LLC | 0.01% | Add +32.3% | 151,801 | $2.8M |
| Prudential Financial Inc. | 0.00% | Add +12.4% | 137,754 | $2.7M |
| Marshall Wace, LLP | 0.00% | New | 147,352 | $2.7M |
| New York State Teachers Retirement System | 0.01% | Add +11.6% | 138,486 | $2.5M |
| California State Teachers Retirement System | 0.00% | Reduce -0.2% | 131,174 | $2.4M |
| Janus Henderson Group PLC | 0.00% | Add +97.8% | 131,000 | $2.4M |
| Keeley-Teton Advisors, LLC | 0.28% | Add +621.3% | 128,081 | $2.3M |
| Eisler Capital Management Ltd. | 0.07% | New | 126,889 | $2.3M |
| Citigroup Inc. | 0.00% | Reduce -64.1% | 117,809 | $2.1M |
| WINTON GROUP Ltd | 0.13% | Add +80.2% | 116,680 | $2.1M |
| State Board of Administration of Florida Retirement System | 0.00% | No change | 114,636 | $2.1M |
| Group One Trading LLC | 0.08% | Add +21.7% | 104,684 | $1.9M |
| Alpine Global Management, LLC | 0.54% | Add +300.0% | 100,000 | $1.8M |
| Seven Grand Managers, LLC | 0.42% | New | 100,000 | $1.8M |
| State of New Jersey Common Pension Fund D | 0.01% | Add +2.1% | 97,653 | $1.8M |
| Envestnet Asset Management Inc. | 0.00% | Reduce -13.4% | 97,188 | $1.8M |
| State of Wisconsin Investment Board | 0.00% | Add +28.3% | 95,714 | $1.7M |
| Country Club Bank | 0.11% | Add +187.6% | 93,752 | $1.7M |
| LPL Financial LLC | 0.00% | Reduce -21.7% | 93,022 | $1.7M |
| North Growth Management Ltd. | 0.35% | Add +1.1% | 92,000 | $1.7M |
| Nomura Holdings Inc. | 0.01% | Add +517.6% | 89,943 | $1.6M |
| T. Rowe Price Associates Inc. | 0.00% | Add +41.8% | 88,101 | $1.6M |
| JPMorgan Chase & Co. | 0.00% | Reduce -22.8% | 87,714 | $1.6M |
| Crestwood Advisors Group, LLC | 0.03% | Reduce -13.9% | 80,559 | $1.5M |
| State of Alaska, Department of Revenue | 0.02% | Add +12.6% | 79,345 | $1.4M |
"% of holder's portfolio" is AMTM's weight in each manager's 13F, not the share of Amentum Holdings Inc. the manager owns.