Amentum HoldingsAMTM
13F holders, Q2 2025 (June 30)460holders +42
104new positions
63sold out
5famous investors
$23.61avg. 13F price*
At the end of Q2 2025, 460 institutions reported holding Amentum Holdings Inc. (AMTM) in their 13F filings, up 42 from Q1 2025. 104 opened new positions and 63 sold out. The largest holders were American Securities LLC ($1.1B), Invesco Ltd. ($462.2M) and BlackRock, Inc. ($448.5M). 5 famous investors held it, including Israel Englander (0.1% of Millennium Management's portfolio), Mario Gabelli (0.0% of GAMCO Investors'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 Q1 2025 → Q2 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 104 | $109.8M |
| Exits | 63 | $125.7M |
All 13F filers, Q1 2025 → Q2 2025: 23,767,971 shares bought and 14,897,964 shares sold, net +8,870,007 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 460 holders
| American Securities LLC | 100.00% | Add +2.6% | 45,026,743 | $1.1B |
| Invesco Ltd. | 0.08% | Add +13.9% | 19,577,241 | $462.2M |
| BlackRock, Inc. | 0.01% | Add +4.1% | 18,995,083 | $448.5M |
| Vanguard Group Inc. | 0.01% | Add +1.2% | 16,533,825 | $390.4M |
| Primecap Management Co. | 0.23% | Add +19.6% | 12,030,656 | $284.0M |
| State Street Corp. | 0.01% | Add +7.6% | 7,078,249 | $167.1M |
| Frontier Capital Management Co. LLC | 1.19% | Add +52.6% | 5,460,743 | $128.9M |
| Millennium Management | 0.10% | Add +131.9% | 4,666,215 | $110.2M |
| FMR LLC | 0.01% | Add +3.7% | 4,573,930 | $108.0M |
| Van Eck Associates Corp. | 0.08% | Add +17.8% | 3,068,158 | $72.4M |
| NorthCoast Asset Management LLC | 0.30% | Reduce -2.4% | 3,000,670 | $70.8M |
| Thompson Siegel & Walmsley LLC | 1.11% | Reduce -16.2% | 2,786,913 | $65.8M |
| Geode Capital Management, LLC | 0.00% | Add +9.3% | 2,513,161 | $59.4M |
| Ruane, Cunniff & Goldfarb L.P. | 0.99% | Add +2.0% | 2,441,743 | $57.6M |
| Discovery Capital Management, LLC / CT | 4.32% | Reduce -12.6% | 2,299,130 | $54.3M |
| Morgan Stanley | 0.00% | Add +4.0% | 2,177,222 | $51.4M |
| Norges Bank | 0.01% | Add +25.9% | 2,160,728 | $51.0M |
| Arvin Capital Management LP | 14.48% | Add +26.8% | 2,139,434 | $50.5M |
| FIL Ltd | 0.04% | Reduce -6.4% | 2,067,205 | $48.8M |
| Freestone Grove Partners LP | 0.37% | Add +76.2% | 2,051,859 | $48.4M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +12.6% | 1,745,013 | $41.2M |
| Thrivent Financial for Lutherans | 0.09% | Add +4.1% | 1,687,105 | $39.8M |
| 683 Capital Management, LLC | 4.14% | Add +60.9% | 1,630,000 | $38.5M |
| Voss Capital, LP | 2.28% | Reduce -37.0% | 1,400,000 | $33.1M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.06% | New | 1,379,752 | $32.6M |
| Dimensional Fund Advisors LP | 0.01% | Add +19.9% | 1,334,752 | $31.5M |
| Loomis Sayles & Co. L P | 0.03% | Add +143.1% | 1,059,209 | $25.0M |
| Penn Capital Management Company, LLC | 2.05% | Add +12.8% | 1,003,472 | $23.8M |
| Brightline Capital Management, LLC | 10.17% | New | 1,000,000 | $23.6M |
| Northern Trust Corp. | 0.00% | Add +10.1% | 941,033 | $22.2M |
| Avenir Corp. | 2.17% | Reduce -1.0% | 895,352 | $21.1M |
| Bank of America Corp. | 0.00% | Reduce -10.3% | 868,265 | $20.5M |
| Bank of New York Mellon Corp | 0.00% | Add +14.2% | 868,206 | $20.5M |
| Cacti Asset Management LLC | 1.42% | Add +1.7% | 848,946 | $19.9M |
| UBS Group AG | 0.00% | Reduce -49.9% | 766,304 | $18.1M |
| Principal Financial Group Inc. | 0.01% | Add +4.5% | 744,517 | $17.6M |
| BW Gestao de Investimentos Ltda. | 1.60% | Add +81.3% | 715,065 | $16.9M |
| New York State Common Retirement Fund | 0.02% | Add +13.4% | 693,777 | $16.4M |
| Voya Investment Management LLC | 0.02% | Add +3.7% | 651,572 | $15.4M |
| Kopernik Global Investors, LLC | 1.65% | Reduce -41.0% | 636,226 | $15.0M |
| Engine Capital Management, LP | 3.17% | No change | 635,255 | $15.0M |
| CSM Advisors, LLC | 0.44% | Reduce -0.8% | 633,048 | $14.9M |
| Moore Capital Management, LP | 0.31% | Add +22.6% | 611,123 | $14.4M |
| Nuveen, LLC | 0.00% | Add +79.5% | 516,574 | $12.2M |
| Public Sector Pension Investment Board | 0.05% | Add +13.0% | 514,172 | $12.1M |
| Loews Corp | 0.09% | Reduce -17.9% | 470,000 | $11.1M |
| CI Investments Inc. | 0.04% | Add +2.4% | 454,422 | $10.7M |
| Royal Bank of Canada | 0.00% | Reduce -23.9% | 443,200 | $10.5M |
| Vident Advisory, LLC | 0.11% | Add +47.6% | 432,165 | $10.2M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +57.5% | 430,542 | $10.2M |
| Aristotle Capital Boston, LLC | 0.51% | Reduce -5.3% | 422,976 | $10.0M |
| Legal & General Group Plc | 0.00% | Add +3.5% | 404,673 | $9.6M |
| Comerica Bank | 0.03% | Add +45.5% | 361,862 | $8.5M |
| Point72 Asset Management | 0.02% | New | 350,628 | $8.3M |
| AQR Capital Management | 0.01% | New | 350,203 | $8.3M |
| Alliancebernstein L.P. | 0.00% | Add +531.9% | 348,684 | $8.2M |
| Citadel Advisors | 0.01% | Reduce -88.3% | 342,899 | $8.1M |
| Ameriprise Financial Inc. | 0.00% | Add +3.4% | 342,862 | $8.1M |
| Royce & Associates LP | 0.08% | New | 335,000 | $7.9M |
| Russell Investments Group, Ltd. | 0.01% | Add +40.9% | 328,182 | $7.7M |
| Swiss National Bank | 0.00% | Add +16.6% | 302,191 | $7.1M |
| Rhumbline Advisers | 0.01% | Reduce -7.4% | 287,247 | $6.8M |
| Grizzlyrock Capital, LLC | 4.50% | Add +54.3% | 253,363 | $6.0M |
| Arosa Capital Management LP | 4.39% | Reduce -38.0% | 252,500 | $6.0M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -46.8% | 238,247 | $5.6M |
| California Public Employees Retirement System | 0.00% | Add +21.9% | 228,921 | $5.4M |
| Telos Capital Management, Inc. | 0.53% | Reduce -13.8% | 220,718 | $5.2M |
| Sei Investments Co. | 0.01% | Add +8.4% | 219,126 | $5.2M |
| Y-Intercept (Hong Kong) Ltd | 0.11% | New | 198,726 | $4.7M |
| Raymond James Financial Inc. | 0.00% | Add +5.1% | 189,810 | $4.5M |
| Hudson Value Partners, LLC | 1.51% | Reduce -1.4% | 185,701 | $4.4M |
| Country Club Bank | 0.25% | Add +83.8% | 172,318 | $4.0M |
| AWH Capital, L.P. | 4.55% | Add +288.8% | 165,250 | $3.9M |
| California State Teachers Retirement System | 0.00% | Add +23.7% | 162,297 | $3.8M |
| Prudential Financial Inc. | 0.00% | Add +8.9% | 150,008 | $3.8M |
| Wealth Enhancement Advisory Services, LLC | 0.01% | Add +2.2% | 155,104 | $3.8M |
| New York State Teachers Retirement System | 0.01% | Reduce -0.8% | 137,435 | $3.2M |
| Ancora Advisors LLC | 0.07% | Add +92.2% | 132,204 | $3.1M |
| Citigroup Inc. | 0.00% | Add +10.2% | 129,864 | $3.1M |
| CenterBook Partners LP | 0.16% | Reduce -69.8% | 125,340 | $3.0M |
| State Board of Administration of Florida Retirement System | 0.01% | Add +6.7% | 122,366 | $2.9M |
| WINTON GROUP Ltd | 0.14% | Reduce -3.6% | 112,421 | $2.7M |
| Soviero Asset Management, LP | 1.90% | New | 110,000 | $2.6M |
| GAMCO Investors | 0.03% | New | 108,670 | $2.6M |
| Nomura Holdings Inc. | 0.02% | Add +20.3% | 108,212 | $2.6M |
| T. Rowe Price Associates Inc. | 0.00% | Add +20.5% | 106,147 | $2.5M |
| RFG Advisory, LLC | 0.06% | New | 102,171 | $2.4M |
| State of New Jersey Common Pension Fund D | 0.01% | Add +2.5% | 100,104 | $2.4M |
| North Growth Management Ltd. | 0.43% | Add +5.4% | 97,000 | $2.3M |
| Envestnet Asset Management Inc. | 0.00% | Reduce -0.4% | 96,785 | $2.3M |
| Verition Fund Management LLC | 0.01% | Reduce -68.2% | 92,481 | $2.2M |
| State of Wisconsin Investment Board | 0.01% | Reduce -4.0% | 91,857 | $2.2M |
| JPMorgan Chase & Co. | 0.00% | Add +4.1% | 91,322 | $2.2M |
| LPL Financial LLC | 0.00% | Reduce -2.5% | 90,733 | $2.1M |
| State of Alaska, Department of Revenue | 0.02% | Add +13.2% | 89,832 | $2.1M |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0.00% | Add +290.3% | 83,769 | $2.0M |
| Crestwood Advisors Group, LLC | 0.03% | Add +1.5% | 81,774 | $1.9M |
| Illinois Municipal Retirement Fund | 0.02% | Add +13.4% | 75,452 | $1.8M |
| Alpine Global Management, LLC | 0.46% | Reduce -24.9% | 75,056 | $1.8M |
| Marshall Wace, LLP | 0.00% | Reduce -49.2% | 74,831 | $1.8M |
"% of holder's portfolio" is AMTM's weight in each manager's 13F, not the share of Amentum Holdings Inc. the manager owns.