Amentum HoldingsAMTM
13F holders, Q4 2025 (December 31)483holders +21
66new positions
57sold out
9famous investors
$27.66avg. 13F price*
At the end of Q4 2025, 483 institutions reported holding Amentum Holdings Inc. (AMTM) in their 13F filings, up 21 from Q3 2025. 66 opened new positions and 57 sold out. The largest holders were American Securities LLC ($1.3B), Invesco Ltd. ($633.2M) and BlackRock, Inc. ($506.3M). 9 famous investors held it, including Joel Greenblatt (0.1% of Gotham Asset Management's portfolio), George Soros (0.1% of Soros Fund Management's portfolio) and Steve Cohen (0.0% of Point72 Asset Management's portfolio).
- Company
- Amentum Holdings Inc.
- CUSIP
- 023939101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 66 | $90.5M |
| Exits | 57 | $206.3M |
All 13F filers, Q3 2025 → Q4 2025: 24,724,911 shares bought and 16,696,074 shares sold, net +8,028,837 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 483 holders
| American Securities LLC | 100.00% | No change | 45,026,743 | $1.3B |
| Invesco Ltd. | 0.06% | Reduce -1.3% | 21,834,003 | $633.2M |
| BlackRock, Inc. | 0.01% | Reduce -3.0% | 17,459,099 | $506.3M |
| Vanguard Group Inc. | 0.01% | Reduce -0.9% | 15,411,745 | $446.9M |
| Primecap Management Co. | 0.27% | Add +1.8% | 12,126,927 | $351.7M |
| FMR LLC | 0.01% | Add +7.6% | 6,707,304 | $194.5M |
| Frontier Capital Management Co. LLC | 1.78% | Add +11.0% | 5,772,976 | $167.4M |
| State Street Corp. | 0.00% | Reduce -25.9% | 5,061,620 | $146.8M |
| Focus Partners Wealth | 0.09% | Add +8467.6% | 2,794,417 | $81.0M |
| Geode Capital Management, LLC | 0.00% | Add +0.2% | 2,659,364 | $77.1M |
| Ruane, Cunniff & Goldfarb L.P. | 1.08% | Reduce -1.2% | 2,394,129 | $69.4M |
| Norges Bank | 0.01% | — | 2,294,097 | $66.5M |
| Morgan Stanley | 0.00% | Add +14.9% | 2,075,352 | $60.2M |
| Thrivent Financial for Lutherans | 0.11% | Add +14.6% | 2,069,104 | $60.0M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.09% | Reduce -5.8% | 1,961,927 | $56.9M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +6.0% | 1,952,002 | $56.6M |
| Thompson Siegel & Walmsley LLC | 0.94% | Reduce -29.6% | 1,921,809 | $55.7M |
| Dimensional Fund Advisors LP | 0.01% | Add +40.3% | 1,832,926 | $53.2M |
| Arvin Capital Management LP | 10.22% | No change | 1,636,492 | $47.5M |
| Cooper Creek Partners Management LLC | 2.13% | New | 1,553,074 | $45.0M |
| AQR Capital Management | 0.02% | Add +778.9% | 1,452,049 | $42.1M |
| FIL Ltd | 0.03% | Reduce -8.3% | 1,429,384 | $41.5M |
| Brightline Capital Management, LLC | 16.32% | Add +16.0% | 1,392,000 | $40.4M |
| ExodusPoint Capital Management, LP | 0.38% | Add +1015.2% | 1,184,186 | $34.3M |
| Bank of America Corp. | 0.00% | Add +45.0% | 1,157,427 | $33.6M |
| Voya Investment Management LLC | 0.04% | Add +5.8% | 1,147,477 | $33.3M |
| Loomis Sayles & Co. L P | 0.04% | Add +5.2% | 1,118,930 | $32.4M |
| Northern Trust Corp. | 0.00% | Add +1.1% | 952,977 | $27.6M |
| Bank of New York Mellon Corp | 0.00% | Add +6.5% | 922,097 | $26.7M |
| Cacti Asset Management LLC | 1.55% | Add +2.9% | 881,692 | $25.7M |
| Verition Fund Management LLC | 0.14% | Reduce -23.8% | 865,172 | $25.1M |
| Avenir Corp. | 2.68% | Reduce -1.3% | 850,944 | $24.7M |
| 683 Capital Management, LLC | 2.12% | Reduce -34.5% | 835,000 | $24.2M |
| Nuveen, LLC | 0.01% | Add +8.3% | 813,774 | $23.6M |
| Penn Capital Management Company, LLC | 1.72% | Reduce -22.6% | 743,937 | $21.6M |
| Principal Financial Group Inc. | 0.01% | Reduce -1.0% | 728,414 | $21.1M |
| Point72 Asset Management | 0.03% | Reduce -49.6% | 695,287 | $20.2M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -20.7% | 644,158 | $18.7M |
| Two Sigma Investments, LP | 0.03% | Add +59.9% | 637,986 | $18.5M |
| Gotham Asset Management | 0.07% | Add +159.5% | 635,430 | $18.4M |
| Segra Capital Management, LLC | 37.50% | Add +45.0% | 604,810 | $17.5M |
| New York State Common Retirement Fund | 0.02% | Reduce -18.8% | 535,218 | $15.5M |
| Van Eck Associates Corp. | 0.01% | Reduce -30.6% | 531,007 | $15.4M |
| Public Sector Pension Investment Board | 0.05% | Reduce -11.3% | 530,566 | $15.4M |
| Royce & Associates LP | 0.15% | Add +9.0% | 495,286 | $14.4M |
| Hyperion Capital Advisors LP | 6.98% | Add +17.1% | 491,872 | $14.3M |
| Moore Capital Management, LP | 0.29% | Add +16.7% | 475,314 | $13.8M |
| Wells Fargo & Company | 0.00% | Add +970.0% | 464,739 | $13.5M |
| Russell Investments Group, Ltd. | 0.01% | Add +50.9% | 437,016 | $12.7M |
| CI Investments Inc. | 0.05% | Reduce -0.6% | 425,528 | $12.3M |
| Ancora Advisors LLC | 0.24% | Add +200.5% | 402,346 | $11.7M |
| Vident Advisory, LLC | 0.10% | Reduce -15.9% | 382,540 | $11.1M |
| First Trust Advisors LP | 0.01% | Add +879.1% | 377,828 | $11.0M |
| Legal & General Group Plc | 0.00% | Reduce -5.1% | 368,605 | $10.7M |
| Aristotle Capital Boston, LLC | 0.57% | Reduce -12.3% | 358,867 | $10.4M |
| SG Americas Securities, LLC | 0.01% | Add +1088.2% | 345,341 | $10.0M |
| Ameriprise Financial Inc. | 0.00% | Reduce -4.9% | 338,599 | $9.8M |
| Legacy Advisors, LLC | 1.05% | New | 9,814,289 | $9.8M |
| Swiss National Bank | 0.01% | Add +1.7% | 311,791 | $9.0M |
| Exchange Traded Concepts, LLC | 0.07% | Add +16.1% | 310,521 | $9.0M |
| Comerica Bank | 0.03% | Reduce -3.5% | 301,564 | $8.7M |
| Rhumbline Advisers | 0.01% | Add +0.6% | 291,441 | $8.5M |
| Grizzlyrock Capital, LLC | 6.19% | Add +0.7% | 285,113 | $8.3M |
| California Public Employees Retirement System | 0.00% | Add +20.1% | 278,644 | $8.1M |
| Hotchkis & Wiley Capital Management LLC | 0.02% | Add +0.1% | 268,375 | $7.8M |
| Balyasny Asset Management L.P. | 0.02% | Add +644.2% | 267,999 | $7.8M |
| Royal Bank of Canada | 0.00% | Add +10.1% | 266,543 | $7.7M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -8.9% | 253,016 | $7.3M |
| AWH Capital, L.P. | 6.29% | No change | 235,250 | $6.8M |
| CenterBook Partners LP | 0.31% | Reduce -27.9% | 222,223 | $6.4M |
| Susquehanna Fundamental Investments, LLC | 0.22% | Add +304.8% | 219,931 | $6.4M |
| Sei Investments Co. | 0.01% | Add +8.2% | 217,044 | $6.3M |
| UBS Group AG | 0.00% | Reduce -10.8% | 206,102 | $6.0M |
| OpenArc Corporate Advisory, LLC | 0.10% | — | 200,325 | $5.8M |
| Hudson Value Partners, LLC | 1.64% | Add +1.2% | 187,993 | $5.5M |
| Telos Capital Management, Inc. | 0.51% | Reduce -1.3% | 187,466 | $5.4M |
| First National Bank of Omaha | 0.15% | New | 177,700 | $5.2M |
| Soviero Asset Management, LP | 2.70% | Add +14.8% | 178,000 | $5.2M |
| Algert Global LLC | 0.08% | Reduce -22.1% | 172,533 | $5.0M |
| Wealth Enhancement Advisory Services, LLC | 0.01% | Add +3.6% | 155,779 | $4.9M |
| Raymond James Financial Inc. | 0.00% | Add +20.6% | 168,045 | $4.9M |
| New York State Teachers Retirement System | 0.01% | Add +17.8% | 166,057 | $4.8M |
| Two Sigma Advisers, LP | 0.01% | Reduce -1.3% | 157,077 | $4.6M |
| California State Teachers Retirement System | 0.00% | Reduce -7.7% | 149,912 | $4.3M |
| Qube Research & Technologies Ltd | 0.01% | New | 146,182 | $4.2M |
| Prudential Financial Inc. | 0.01% | Reduce -3.2% | 142,422 | $4.1M |
| Twinbeech Capital LP | 0.28% | Reduce -38.3% | 137,453 | $4.0M |
| T. Rowe Price Associates Inc. | 0.00% | Add +9.6% | 129,482 | $3.8M |
| South Dakota Investment Council | 0.07% | Add +91.0% | 123,037 | $3.6M |
| State Board of Administration of Florida Retirement System | 0.01% | No change | 120,865 | $3.5M |
| Caption Management, LLC | 0.15% | Add +183.4% | 116,500 | $3.4M |
| Soros Fund Management | 0.06% | New | 109,303 | $3.2M |
| State of Wisconsin Investment Board | 0.01% | Add +13.4% | 103,682 | $3.0M |
| Bryn Mawr Trust Advisors, LLC | 0.14% | Add +28.0% | 101,949 | $3.0M |
| WINTON GROUP Ltd | 0.10% | Add +90.0% | 101,449 | $2.9M |
| Blackstone Inc. | 0.01% | Add +102.9% | 99,643 | $2.9M |
| State of New Jersey Common Pension Fund D | 0.01% | Add +12.9% | 98,984 | $2.9M |
| North Growth Management Ltd. | 0.44% | Add +1.0% | 98,000 | $2.8M |
| GAMCO Investors | 0.03% | Reduce -7.8% | 91,861 | $2.7M |
| JPMorgan Chase & Co. | 0.00% | Reduce -14.8% | 89,291 | $2.6M |
"% of holder's portfolio" is AMTM's weight in each manager's 13F, not the share of Amentum Holdings Inc. the manager owns.