Amentum HoldingsAMTM
13F holders, Q1 2026 (March 31)487holders +4
62new positions
58sold out
10famous investors
$25.00avg. 13F price*
At the end of Q1 2026, 487 institutions reported holding Amentum Holdings Inc. (AMTM) in their 13F filings, up 4 from Q4 2025. 62 opened new positions and 58 sold out. The largest holders were American Securities LLC ($1.2B), Invesco Ltd. ($560.0M) and BlackRock, Inc. ($465.3M). 10 famous investors held it, including Steve Cohen (0.1% of Point72 Asset Management's portfolio), George Soros (0.1% of Soros Fund Management's portfolio) and Joel Greenblatt (0.0% of Gotham Asset Management's portfolio).
- Company
- Amentum Holdings Inc.
- CUSIP
- 023939101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 62 | $175.9M |
| Exits | 58 | $59.3M |
All 13F filers, Q4 2025 → Q1 2026: 20,556,665 shares bought and 10,814,470 shares sold, net +9,742,195 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 487 holders
| American Securities LLC | 29.88% | No change | 45,026,743 | $1.2B |
| Invesco Ltd. | 0.05% | Reduce -1.6% | 21,473,778 | $560.0M |
| BlackRock, Inc. | 0.01% | Add +2.2% | 17,841,283 | $465.3M |
| Primecap Management Co. | 0.25% | Reduce -0.3% | 12,085,294 | $315.2M |
| Vanguard Portfolio Management LLC | 0.01% | — | 7,852,951 | $204.8M |
| Vanguard Capital Management LLC | 0.00% | — | 6,650,879 | $173.5M |
| FMR LLC | 0.01% | Reduce -16.8% | 5,578,386 | $145.5M |
| State Street Corp. | 0.00% | Add +0.3% | 5,079,041 | $132.5M |
| Frontier Capital Management Co. LLC | 1.32% | Reduce -14.6% | 4,930,210 | $128.6M |
| Dimensional Fund Advisors LP | 0.02% | Add +106.6% | 3,787,420 | $98.8M |
| Geode Capital Management, LLC | 0.00% | Add +5.8% | 2,814,415 | $73.4M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.10% | Add +42.0% | 2,785,134 | $72.6M |
| Focus Partners Wealth | 0.08% | Reduce -6.8% | 2,604,911 | $67.9M |
| Bank of America Corp. | 0.00% | Add +107.8% | 2,405,041 | $62.7M |
| Morgan Stanley | 0.00% | Add +7.7% | 2,234,913 | $58.3M |
| Thrivent Financial for Lutherans | 0.11% | Add +1.5% | 2,100,457 | $54.8M |
| Arvin Capital Management LP | 12.62% | Add +26.6% | 2,071,200 | $54.0M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +5.9% | 2,067,930 | $53.9M |
| UBS Group AG | 0.01% | Add +730.1% | 1,710,775 | $44.6M |
| Point72 Asset Management | 0.08% | Add +134.5% | 1,630,563 | $42.5M |
| Ruane, Cunniff & Goldfarb L.P. | 0.70% | Reduce -32.2% | 1,622,982 | $42.3M |
| Segra Capital Management, LLC | 32.74% | Add +166.7% | 1,612,726 | $42.1M |
| Permian Investment Partners, LP | 4.52% | New | 1,567,000 | $40.9M |
| Toronto Dominion Bank | 0.08% | New | 1,565,223 | $40.8M |
| Thompson Siegel & Walmsley LLC | 0.70% | Reduce -20.6% | 1,525,884 | $39.8M |
| Brightline Capital Management, LLC | 10.77% | Add +0.3% | 1,396,000 | $36.4M |
| Verition Fund Management LLC | 0.35% | Add +50.0% | 1,297,946 | $33.9M |
| Voya Investment Management LLC | 0.04% | Add +4.5% | 1,199,491 | $31.3M |
| Goldman Sachs Group Inc. | 0.00% | Add +75.7% | 1,131,438 | $29.5M |
| Loomis Sayles & Co. L P | 0.04% | Reduce -3.4% | 1,081,336 | $28.2M |
| Troluce Capital Advisors LLC | 2.82% | New | 1,000,000 | $26.1M |
| Northern Trust Corp. | 0.00% | Add +3.3% | 984,105 | $25.7M |
| Vanguard Fiduciary Trust Co. | 0.01% | — | 947,460 | $24.7M |
| Cooper Creek Partners Management LLC | 1.17% | Reduce -40.2% | 929,334 | $24.2M |
| Bank of New York Mellon Corp | 0.00% | Reduce -1.5% | 908,599 | $23.7M |
| Two Sigma Investments, LP | 0.02% | Add +41.1% | 900,177 | $23.5M |
| Cacti Asset Management LLC | 1.39% | No change | 881,692 | $23.0M |
| Moore Capital Management, LP | 0.91% | Add +83.8% | 873,610 | $22.8M |
| Nuveen, LLC | 0.01% | Add +7.1% | 871,795 | $22.7M |
| Avenir Corp. | 2.67% | Reduce -1.2% | 841,099 | $21.9M |
| 683 Capital Management, LLC | 1.98% | Reduce -7.2% | 775,000 | $20.2M |
| Principal Financial Group Inc. | 0.01% | Add +2.2% | 744,728 | $19.4M |
| Russell Investments Group, Ltd. | 0.02% | Add +63.3% | 713,828 | $18.6M |
| Ancora Advisors LLC | 0.39% | Add +74.8% | 703,119 | $18.3M |
| Penn Capital Management Company, LLC | 1.41% | Reduce -6.7% | 694,352 | $18.2M |
| FIL Ltd | 0.01% | Reduce -54.4% | 652,159 | $17.0M |
| Wells Fargo & Company | 0.00% | Add +37.0% | 636,674 | $16.6M |
| Millennium Management | 0.01% | Add +931.4% | 631,055 | $16.5M |
| Public Sector Pension Investment Board | 0.04% | Add +3.6% | 549,797 | $14.3M |
| Royce & Associates LP | 0.14% | Add +11.0% | 549,778 | $14.3M |
| Van Eck Associates Corp. | 0.01% | Add +3.1% | 547,644 | $14.3M |
| Gotham Asset Management | 0.04% | Reduce -18.0% | 521,041 | $13.6M |
| AQR Capital Management | 0.01% | Reduce -65.0% | 507,843 | $13.2M |
| New York State Common Retirement Fund | 0.02% | Reduce -6.1% | 502,487 | $13.1M |
| CI Investments Inc. | 0.05% | Reduce -1.3% | 420,068 | $11.0M |
| Vident Advisory, LLC | 0.09% | Add +1.6% | 388,862 | $10.1M |
| De Lisle Partners LLP | 1.18% | New | 379,818 | $9.9M |
| Legacy Advisors, LLC | 1.07% | Reduce -7.6% | 9,064,278 | $9.1M |
| Aristotle Capital Boston, LLC | 0.56% | Reduce -3.9% | 344,976 | $9.0M |
| Legal & General Group Plc | 0.00% | Reduce -9.2% | 334,896 | $8.7M |
| Hotchkis & Wiley Capital Management LLC | 0.03% | Add +24.4% | 333,800 | $8.7M |
| Mawer Investment Management Ltd. | 0.06% | New | 333,790 | $8.7M |
| Susquehanna International Group, LLP | 0.01% | New | 330,049 | $8.6M |
| Ameriprise Financial Inc. | 0.00% | Reduce -2.6% | 329,745 | $8.6M |
| Rovida Investment Management Ltd | 1.03% | New | 315,000 | $8.2M |
| Swiss National Bank | 0.00% | Add +0.5% | 313,391 | $8.2M |
| Hyperion Capital Advisors LP | 3.81% | Reduce -38.3% | 303,576 | $7.9M |
| Rhumbline Advisers | 0.01% | Add +3.0% | 300,293 | $7.8M |
| Exchange Traded Concepts, LLC | 0.06% | Reduce -5.0% | 295,008 | $7.7M |
| Sei Investments Co. | 0.01% | Add +35.8% | 294,668 | $7.7M |
| Grizzlyrock Capital, LLC | 5.97% | Add +1.4% | 289,113 | $7.5M |
| California Public Employees Retirement System | 0.00% | Reduce -0.6% | 277,052 | $7.2M |
| SG Americas Securities, LLC | 0.01% | Reduce -20.5% | 274,602 | $7.2M |
| Fifth Third Bancorp | 0.01% | Add +10456.8% | 273,316 | $7.1M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -2.0% | 247,957 | $6.5M |
| Raymond James Financial Inc. | 0.00% | Add +46.3% | 245,824 | $6.4M |
| First National Bank of Omaha | 0.19% | Add +39.6% | 248,004 | $6.3M |
| Soviero Asset Management, LP | 3.51% | Add +34.8% | 240,000 | $6.3M |
| AWH Capital, L.P. | 5.57% | No change | 235,250 | $6.1M |
| Royal Bank of Canada | 0.00% | Reduce -13.1% | 231,742 | $6.0M |
| First Trust Advisors LP | 0.00% | Reduce -39.6% | 228,083 | $5.9M |
| Susquehanna Fundamental Investments, LLC | 0.21% | Reduce -1.0% | 217,780 | $5.7M |
| Hudson Value Partners, LLC | 1.59% | Add +8.5% | 203,910 | $5.3M |
| Jane Street Group, LLC | 0.01% | Add +1676.1% | 191,979 | $5.0M |
| Telos Capital Management, Inc. | 0.47% | Add +1.3% | 189,901 | $5.0M |
| California State Teachers Retirement System | 0.01% | Add +23.1% | 184,555 | $4.8M |
| Hel Ved Capital Management Ltd | 0.81% | New | 178,500 | $4.7M |
| North Growth Management Ltd. | 0.69% | Add +75.5% | 172,000 | $4.5M |
| OpenArc Corporate Advisory, LLC | 0.06% | Reduce -15.0% | 170,352 | $4.4M |
| Oppenheimer & Co. Inc. | 0.05% | New | 168,872 | $4.4M |
| New York State Teachers Retirement System | 0.01% | Reduce -0.4% | 165,329 | $4.3M |
| Wedge Capital Management L L P | 0.08% | New | 164,666 | $4.3M |
| Quantinno Capital Management LP | 0.01% | Add +86.7% | 145,574 | $3.8M |
| T. Rowe Price Associates Inc. | 0.00% | Add +12.2% | 145,253 | $3.8M |
| CenterBook Partners LP | 0.20% | Reduce -35.3% | 143,698 | $3.7M |
| Prudential Financial Inc. | 0.00% | Reduce -1.4% | 140,430 | $3.7M |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 127,793 | $3.3M |
| Bessemer Group Inc. | 0.01% | Add +7142.8% | 125,952 | $3.3M |
| Holocene Advisors, LP | 0.01% | Add +55.3% | 123,197 | $3.2M |
| South Dakota Investment Council | 0.06% | No change | 123,037 | $3.2M |
"% of holder's portfolio" is AMTM's weight in each manager's 13F, not the share of Amentum Holdings Inc. the manager owns.