Amentum Holdings, Inc.
AMTM- Exchange
- NYSE
- Industry
- Services-Business Services, NEC
- SEC CIK
- 0002011286
No open-market purchases or sales by Amentum Holdings, Inc. insiders were filed in the last 90 days; 464 institutions reported holding it in 13F filings for Q2 2026, worth $4.35B in total; Soros Fund Management is the only superinvestor holding it.
13F holders, Q2 2025
Institutional positions in Amentum Holdings, Inc. as of Jun 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 461
- +48 vs. Q1 2025
- Shares held
- 200.3M
- +8.87M (+4.6%) vs. Q1 2025
- Total value
- $4.73B
- +$1.25B (+35.7%) vs. Q1 2025
- New holders
- 113
- 233 more added
- Sold out
- 65
- 100 more reduced
5 institutions that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting AMTM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 464 | $4.35B |
| Q1 2026 | 486 | $5.28B |
| Q4 2025 | 483 | $5.64B |
| Q3 2025 | 462 | $4.63B |
| Q2 2025 | 461 | $4.74B |
| Q1 2025 | 418 | $3.50B |
| Q4 2024 | 451 | $3.50B |
| Q3 2024 | 492 | $3.25B |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q2 2025
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q1 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| American Securities LLC | 45,026,743 | $1.06B | 100.00% | +1,132,839+2.6% | Added |
| Invesco Ltd. | 19,577,241 | $462.2M | 0.08% | +2,386,131+13.9% | Added |
| BlackRock, Inc. | 18,995,083 | $448.5M | 0.01% | +746,094+4.1% | Added |
| Vanguard Group Inc | 16,533,825 | $390.4M | 0.01% | +191,265+1.2% | Added |
| Primecap Management Co | 12,030,656 | $284.0M | 0.23% | +1,969,067+19.6% | Added |
| State Street Corp | 7,078,249 | $167.1M | 0.01% | +501,898+7.6% | Added |
| Frontier Capital Management Co LLC | 5,460,743 | $128.9M | 1.19% | +1,882,011+52.6% | Added |
| Millennium Management LLC | 4,666,215 | $110.2M | 0.10% | +2,654,423+131.9% | Added |
| FMR LLC | 4,573,930 | $108.0M | 0.01% | +164,981+3.7% | Added |
| Van Eck Associates Corp | 3,068,158 | $72.4M | 0.08% | +464,594+17.8% | Added |
| Kovitz Investment Group Partners, LLC | 3,000,670 | $70.8M | 0.30% | −74,635−2.4% | Reduced |
| Thompson Siegel & Walmsley LLC | 2,786,913 | $65.8M | 1.11% | −539,465−16.2% | Reduced |
| Geode Capital Management, LLC | 2,513,161 | $59.4M | 0.00% | +213,164+9.3% | Added |
| Ruane, Cunniff & Goldfarb L.P. | 2,441,743 | $57.6M | 0.99% | +48,704+2.0% | Added |
| Discovery Capital Management, LLC | 2,299,130 | $54.3M | 4.26% | −331,800−12.6% | Reduced |
| Morgan Stanley | 2,177,222 | $51.4M | 0.00% | +84,374+4.0% | Added |
| Norges Bank | 2,160,728 | $51.0M | 0.01% | +444,222+25.9% | Added |
| Arvin Capital Management LP | 2,139,434 | $50.5M | 14.42% | +452,285+26.8% | Added |
| FIL Ltd | 2,067,205 | $48.8M | 0.04% | −142,108−6.4% | Reduced |
| Freestone Grove Partners LP | 2,051,859 | $48.4M | 0.37% | +887,024+76.2% | Added |
| Charles Schwab Investment Management Inc | 1,745,013 | $41.2M | 0.01% | +195,855+12.6% | Added |
| Thrivent Financial for Lutherans | 1,687,105 | $39.8M | 0.09% | +65,781+4.1% | Added |
| 683 Capital Management, LLC | 1,630,000 | $38.5M | 3.90% | +617,000+60.9% | Added |
| Voss Capital, LLC | 1,400,000 | $33.1M | 2.28% | −820,709−37.0% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 1,379,752 | $32.6M | 0.06% | +1,379,752 | New |
| Dimensional Fund Advisors LP | 1,334,752 | $31.5M | 0.01% | +221,098+19.9% | Added |
| Loomis Sayles & Co L P | 1,059,209 | $25.0M | 0.03% | +623,535+143.1% | Added |
| Penn Capital Management Co Inc | 1,003,472 | $23.8M | 2.05% | +114,038+12.8% | Added |
| Brightline Capital Management, LLC | 1,000,000 | $23.6M | 10.17% | +1,000,000 | New |
| Northern Trust Corp | 941,033 | $22.2M | 0.00% | +86,610+10.1% | Added |
| Avenir Corp | 895,352 | $21.1M | 2.17% | −8,810−1.0% | Reduced |
| Bank of America Corp | 868,265 | $20.5M | 0.00% | −100,273−10.4% | Reduced |
| Bank of New York Mellon Corp | 868,206 | $20.5M | 0.00% | +107,697+14.2% | Added |
| Cacti Asset Management LLC | 848,946 | $19.9M | 1.42% | +14,504+1.7% | Added |
| UBS Group AG | 766,304 | $18.1M | 0.00% | −763,830−49.9% | Reduced |
| Principal Financial Group Inc | 744,517 | $17.6M | 0.01% | +32,345+4.5% | Added |
| BW Gestao de Investimentos Ltda. | 715,065 | $16.9M | 1.60% | +320,665+81.3% | Added |
| New York State Common Retirement Fund | 693,777 | $16.4M | 0.02% | +81,990+13.4% | Added |
| Voya Investment Management LLC | 651,572 | $15.4M | 0.02% | +23,418+3.7% | Added |
| Kopernik Global Investors, LLC | 636,226 | $15.0M | 1.65% | −441,269−41.0% | Reduced |
| Engine Capital Management, LP | 635,255 | $15.0M | 3.17% | 00.0% | Unchanged |
| CSM Advisors, LLC | 633,048 | $14.9M | 0.44% | −5,009−0.8% | Reduced |
| Moore Capital Management, LP | 611,123 | $14.4M | 0.29% | +112,859+22.7% | Added |
| Nuveen, LLC | 516,574 | $12.2M | 0.00% | +228,773+79.5% | Added |
| Public Sector Pension Investment Board | 514,172 | $12.1M | 0.05% | +59,043+13.0% | Added |
| Loews Corp | 470,000 | $11.1M | 0.09% | −102,684−17.9% | Reduced |
| Ci Investments Inc. | 454,422 | $10.7M | 0.04% | +10,841+2.4% | Added |
| Royal Bank of Canada | 443,200 | $10.5M | 0.00% | −138,995−23.9% | Reduced |
| Vident Advisory, LLC | 432,165 | $10.2M | 0.11% | +139,308+47.6% | Added |
| UBS Asset Management Americas Inc | 430,542 | $10.2M | 0.00% | +157,259+57.5% | Added |
| Aristotle Capital Boston, LLC | 422,976 | $9.99M | 0.51% | −23,636−5.3% | Reduced |
| Legal & General Group Plc | 404,673 | $9.55M | 0.00% | +13,736+3.5% | Added |
| Comerica Bank | 361,862 | $8.54M | 0.03% | +113,144+45.5% | Added |
| Point72 Asset Management, L.P. | 350,628 | $8.28M | 0.02% | +350,628 | New |
| AQR Capital Management LLC | 350,203 | $8.27M | 0.01% | +350,203 | New |
| Alliancebernstein L.P. | 348,684 | $8.23M | 0.00% | +293,505+531.9% | Added |
| Citadel Advisors LLC | 342,899 | $8.10M | 0.01% | −2,583,583−88.3% | Reduced |
| Ameriprise Financial Inc | 342,862 | $8.09M | 0.00% | +11,265+3.4% | Added |
| Royce & Associates LP | 335,000 | $7.91M | 0.08% | +335,000 | New |
| Russell Investments Group, Ltd. | 328,182 | $7.75M | 0.01% | +95,249+40.9% | Added |
| Swiss National Bank | 302,191 | $7.13M | 0.00% | +42,991+16.6% | Added |
| Rhumbline Advisers | 287,247 | $6.78M | 0.01% | −22,856−7.4% | Reduced |
| Grizzlyrock Capital, LLC | 253,363 | $5.98M | 4.50% | +89,137+54.3% | Added |
| Arosa Capital Management LP | 252,500 | $5.96M | 4.35% | −154,400−37.9% | Reduced |
| Goldman Sachs Group Inc | 238,247 | $5.63M | 0.00% | −209,331−46.8% | Reduced |
| California Public Employees Retirement System | 228,921 | $5.40M | 0.00% | +41,073+21.9% | Added |
| Telos Capital Management, Inc. | 220,718 | $5.21M | 0.53% | −35,460−13.8% | Reduced |
| SEI Investments Co | 219,126 | $5.17M | 0.01% | +16,976+8.4% | Added |
| Y-Intercept (Hong Kong) Ltd | 198,726 | $4.69M | 0.11% | +198,726 | New |
| Raymond James Financial Inc | 189,810 | $4.48M | 0.00% | +9,238+5.1% | Added |
| Hudson Value Partners, LLC | 185,701 | $4.38M | 1.51% | −2,582−1.4% | Reduced |
| Country Club Bank | 172,318 | $4.04M | 0.25% | +78,566+83.8% | Added |
| AWH Capital, L.P. | 165,250 | $3.90M | 4.55% | +122,750+288.8% | Added |
| California State Teachers Retirement System | 162,297 | $3.83M | 0.00% | +31,123+23.7% | Added |
| Prudential Financial Inc | 150,008 | $3.77M | 0.00% | +12,254+8.9% | Added |
| Wealth Enhancement Advisory Services, LLC | 155,104 | $3.76M | 0.01% | +3,303+2.2% | Added |
| New York State Teachers Retirement System | 137,435 | $3.25M | 0.01% | −1,051−0.8% | Reduced |
| Ancora Advisors, LLC | 132,204 | $3.12M | 0.07% | +63,434+92.2% | Added |
| Citigroup Inc | 129,864 | $3.07M | 0.00% | +12,055+10.2% | Added |
| CenterBook Partners LP | 125,340 | $2.96M | 0.16% | −289,234−69.8% | Reduced |
| State Board of Administration of Florida Retirement System | 122,366 | $2.89M | 0.01% | +7,730+6.7% | Added |
| Winton Group Ltd | 112,421 | $2.65M | 0.14% | −4,259−3.7% | Reduced |
| Soviero Asset Management, LP | 110,000 | $2.60M | 1.90% | +110,000 | New |
| Gamco Investors, Inc. Et Al | 108,670 | $2.57M | 0.03% | +108,670 | New |
| Nomura Holdings Inc | 108,212 | $2.55M | 0.02% | +18,269+20.3% | Added |
| Price T Rowe Associates Inc | 106,147 | $2.51M | 0.00% | +18,046+20.5% | Added |
| RFG Advisory, LLC | 102,171 | $2.41M | 0.06% | +102,171 | New |
| State of New Jersey Common Pension Fund D | 100,104 | $2.36M | 0.01% | +2,451+2.5% | Added |
| North Growth Management Ltd. | 97,000 | $2.30M | 0.43% | +5,000+5.4% | Added |
| Envestnet Asset Management Inc | 96,785 | $2.29M | 0.00% | −403−0.4% | Reduced |
| Verition Fund Management LLC | 92,481 | $2.18M | 0.01% | −198,225−68.2% | Reduced |
| State of Wisconsin Investment Board | 91,857 | $2.17M | 0.01% | −3,857−4.0% | Reduced |
| JPMorgan Chase & Co | 91,322 | $2.16M | 0.00% | +3,608+4.1% | Added |
| LPL Financial LLC | 90,733 | $2.14M | 0.00% | −2,289−2.5% | Reduced |
| State of Alaska, Department of Revenue | 89,832 | $2.12M | 0.02% | +10,487+13.2% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 83,769 | $1.98M | 0.00% | +62,304+290.3% | Added |
| Crestwood Advisors Group LLC | 81,774 | $1.93M | 0.03% | +1,215+1.5% | Added |
| Illinois Municipal Retirement Fund | 75,452 | $1.78M | 0.02% | +8,945+13.4% | Added |
| Alpine Global Management, LLC | 75,056 | $1.77M | 0.40% | −24,944−24.9% | Reduced |
| Marshall Wace, LLP | 74,831 | $1.77M | 0.00% | −72,521−49.2% | Reduced |