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, Q1 2025
Institutional positions in Amentum Holdings, Inc. as of Mar 31, 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
- 418
- −22 vs. Q4 2024
- Shares held
- 191.7M
- +26.8M (+16.3%) vs. Q4 2024
- Total value
- $3.49B
- +$18.2M (+0.5%) vs. Q4 2024
- New holders
- 73
- 112 more added
- Sold out
- 95
- 151 more reduced
11 institutions that held it in Q4 2024 haven't filed for Q1 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2024: 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, Q1 2025
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q4 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| American Securities LLC | 43,893,904 | $798.9M | 100.00% | 00.0% | Unchanged |
| BlackRock, Inc. | 18,248,989 | $332.1M | 0.01% | +1,474,218+8.8% | Added |
| Invesco Ltd. | 17,191,110 | $312.9M | 0.06% | +3,334,871+24.1% | Added |
| Vanguard Group Inc | 16,342,560 | $297.4M | 0.01% | −199,887−1.2% | Reduced |
| Primecap Management Co | 10,061,589 | $183.1M | 0.15% | +3,647,210+56.9% | Added |
| State Street Corp | 6,576,351 | $119.7M | 0.00% | +122,098+1.9% | Added |
| FMR LLC | 4,408,949 | $80.2M | 0.01% | +2,013,896+84.1% | Added |
| Frontier Capital Management Co LLC | 3,578,732 | $65.1M | 0.71% | +3,578,732 | New |
| Thompson Siegel & Walmsley LLC | 3,326,378 | $60.5M | 1.03% | +1,377,694+70.7% | Added |
| Kovitz Investment Group Partners, LLC | 3,075,305 | $56.0M | 0.28% | −76,957−2.4% | Reduced |
| Citadel Advisors LLC | 2,926,482 | $53.3M | 0.05% | +2,531,660+641.2% | Added |
| Discovery Capital Management, LLC | 2,630,930 | $47.9M | 5.73% | +2,165,630+465.4% | Added |
| Van Eck Associates Corp | 2,603,564 | $47.4M | 0.06% | +1,471,279+129.9% | Added |
| Ruane, Cunniff & Goldfarb L.P. | 2,393,039 | $43.6M | 0.79% | −43,255−1.8% | Reduced |
| Geode Capital Management, LLC | 2,299,997 | $41.9M | 0.00% | +336,749+17.2% | Added |
| Voss Capital, LLC | 2,220,709 | $40.4M | 3.10% | +1,770,891+393.7% | Added |
| FIL Ltd | 2,209,313 | $40.2M | 0.04% | +415,760+23.2% | Added |
| Morgan Stanley | 2,092,848 | $38.1M | 0.00% | +610,327+41.2% | Added |
| Millennium Management LLC | 2,011,792 | $36.6M | 0.04% | +815,218+68.1% | Added |
| Balyasny Asset Management LLC | 1,880,887 | $34.2M | 0.09% | +1,880,887 | New |
| Norges Bank | 1,716,506 | $31.2M | 0.00% | +276,379+19.2% | Added |
| Arvin Capital Management LP | 1,687,149 | $30.7M | 11.29% | +721,952+74.8% | Added |
| Thrivent Financial for Lutherans | 1,621,324 | $29.5M | 0.06% | +9,528+0.6% | Added |
| Charles Schwab Investment Management Inc | 1,549,158 | $28.2M | 0.01% | +284,901+22.5% | Added |
| UBS Group AG | 1,530,134 | $27.8M | 0.01% | +398,390+35.2% | Added |
| Cooper Creek Partners Management LLC | 1,223,986 | $22.3M | 0.72% | −2,933,048−70.6% | Reduced |
| Freestone Grove Partners LP | 1,164,835 | $21.2M | 0.22% | +1,164,835 | New |
| Dimensional Fund Advisors LP | 1,113,654 | $20.3M | 0.01% | −40,476−3.5% | Reduced |
| Kopernik Global Investors, LLC | 1,077,495 | $19.6M | 2.03% | +311,513+40.7% | Added |
| 683 Capital Management, LLC | 1,013,000 | $18.4M | 1.87% | +588,000+138.4% | Added |
| Bank of America Corp | 968,538 | $17.6M | 0.00% | +359,693+59.1% | Added |
| Avenir Corp | 904,162 | $16.5M | 1.73% | +710,692+367.3% | Added |
| Penn Capital Management Co Inc | 889,434 | $16.2M | 1.58% | +443,126+99.3% | Added |
| Northern Trust Corp | 854,423 | $15.6M | 0.00% | +12,204+1.4% | Added |
| Cacti Asset Management LLC | 834,442 | $15.1M | 1.17% | +9,978+1.2% | Added |
| Bank of New York Mellon Corp | 760,509 | $13.8M | 0.00% | +109,195+16.8% | Added |
| Principal Financial Group Inc | 712,172 | $13.0M | 0.01% | +110,123+18.3% | Added |
| CSM Advisors, LLC | 638,057 | $11.6M | 0.63% | −1,000−0.2% | Reduced |
| Ghisallo Capital Management LLC | 635,569 | $11.6M | 1.01% | +635,569 | New |
| Engine Capital Management, LP | 635,255 | $11.6M | 2.19% | +13,855+2.2% | Added |
| Voya Investment Management LLC | 628,154 | $11.4M | 0.01% | +224,039+55.4% | Added |
| New York State Common Retirement Fund | 611,787 | $11.1M | 0.02% | +232,835+61.4% | Added |
| Jane Street Group, LLC | 601,760 | $11.0M | 0.02% | +574,270+2,089.0% | Added |
| Royal Bank of Canada | 582,195 | $10.6M | 0.00% | −36,708−5.9% | Reduced |
| Loews Corp | 572,684 | $10.4M | 0.08% | +572,684 | New |
| Susquehanna International Group, LLP | 533,567 | $9.71M | 0.02% | −342,794−39.1% | Reduced |
| Moore Capital Management, LP | 498,264 | $9.07M | 0.30% | −93,926−15.9% | Reduced |
| Public Sector Pension Investment Board | 455,129 | $8.28M | 0.04% | +145,943+47.2% | Added |
| Davidson Kempner Capital Management LP | 450,000 | $8.19M | 0.12% | +450,000 | New |
| Goldman Sachs Group Inc | 447,578 | $8.15M | 0.00% | +175,353+64.4% | Added |
| Aristotle Capital Boston, LLC | 446,612 | $8.13M | 0.41% | −30,365−6.4% | Reduced |
| Ci Investments Inc. | 443,581 | $8.07M | 0.03% | −199,534−31.0% | Reduced |
| Loomis Sayles & Co L P | 435,674 | $7.93M | 0.01% | +435,674 | New |
| CenterBook Partners LP | 414,574 | $7.55M | 0.48% | +343,268+481.4% | Added |
| Arosa Capital Management LP | 406,900 | $7.41M | 4.91% | +56,900+16.3% | Added |
| BW Gestao de Investimentos Ltda. | 394,400 | $7.18M | 0.81% | +394,400 | New |
| Legal & General Group Plc | 390,937 | $7.12M | 0.00% | −287,166−42.3% | Reduced |
| Monashee Investment Management LLC | 360,000 | $6.55M | 0.78% | +360,000 | New |
| Ameriprise Financial Inc | 331,597 | $6.04M | 0.00% | −27,630−7.7% | Reduced |
| Rhumbline Advisers | 310,103 | $5.64M | 0.01% | +14,919+5.1% | Added |
| Castalian Partners, LLC | 304,500 | $5.54M | 24.34% | −695,500−69.6% | Reduced |
| Vident Advisory, LLC | 292,857 | $5.33M | 0.08% | +277,594+1,818.7% | Added |
| Verition Fund Management LLC | 290,706 | $5.29M | 0.03% | −30,210−9.4% | Reduced |
| Nuveen, LLC | 287,801 | $5.24M | 0.00% | +287,801 | New |
| UBS Asset Management Americas Inc | 273,283 | $4.97M | 0.00% | −451−0.2% | Reduced |
| Swiss National Bank | 259,200 | $4.72M | 0.00% | −4,000−1.5% | Reduced |
| Telos Capital Management, Inc. | 256,178 | $4.66M | 0.51% | −10,858−4.1% | Reduced |
| Comerica Bank | 248,718 | $4.53M | 0.02% | +199,931+409.8% | Added |
| Russell Investments Group, Ltd. | 232,933 | $4.24M | 0.01% | +107,395+85.5% | Added |
| Twinbeech Capital LP | 225,438 | $4.10M | 0.07% | +225,438 | New |
| SEI Investments Co | 202,150 | $3.68M | 0.00% | −85,163−29.6% | Reduced |
| Hudson Value Partners, LLC | 188,283 | $3.43M | 1.29% | +188,283 | New |
| California Public Employees Retirement System | 187,848 | $3.42M | 0.00% | −9,671−4.9% | Reduced |
| Raymond James Financial Inc | 180,572 | $3.29M | 0.00% | +95,010+111.0% | Added |
| Grizzlyrock Capital, LLC | 164,226 | $2.99M | 2.71% | +164,226 | New |
| Wealth Enhancement Advisory Services, LLC | 151,801 | $2.76M | 0.01% | +37,057+32.3% | Added |
| Prudential Financial Inc | 137,754 | $2.70M | 0.00% | +15,180+12.4% | Added |
| Marshall Wace, LLP | 147,352 | $2.68M | 0.00% | +147,352 | New |
| New York State Teachers Retirement System | 138,486 | $2.52M | 0.01% | +14,364+11.6% | Added |
| California State Teachers Retirement System | 131,174 | $2.39M | 0.00% | −245−0.2% | Reduced |
| Janus Henderson Group PLC | 131,000 | $2.37M | 0.00% | +64,761+97.8% | Added |
| Keeley-Teton Advisors, LLC | 128,081 | $2.33M | 0.28% | +110,324+621.3% | Added |
| Eisler Capital Management Ltd. | 126,889 | $2.31M | 0.07% | +126,889 | New |
| Citigroup Inc | 117,809 | $2.14M | 0.00% | −209,953−64.1% | Reduced |
| Winton Group Ltd | 116,680 | $2.12M | 0.13% | +51,932+80.2% | Added |
| State Board of Administration of Florida Retirement System | 114,636 | $2.09M | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 104,684 | $1.91M | 0.08% | +18,648+21.7% | Added |
| Alpine Global Management, LLC | 100,000 | $1.82M | 0.48% | +75,000+300.0% | Added |
| Seven Grand Managers, LLC | 100,000 | $1.82M | 0.42% | +100,000 | New |
| State of New Jersey Common Pension Fund D | 97,653 | $1.78M | 0.01% | +1,976+2.1% | Added |
| Envestnet Asset Management Inc | 97,188 | $1.77M | 0.00% | −15,035−13.4% | Reduced |
| State of Wisconsin Investment Board | 95,714 | $1.74M | 0.00% | +21,091+28.3% | Added |
| Country Club Bank | 93,752 | $1.69M | 0.11% | +61,158+187.6% | Added |
| LPL Financial LLC | 93,022 | $1.69M | 0.00% | −25,760−21.7% | Reduced |
| North Growth Management Ltd. | 92,000 | $1.67M | 0.35% | +1,000+1.1% | Added |
| Nomura Holdings Inc | 89,943 | $1.64M | 0.01% | +75,380+517.6% | Added |
| Price T Rowe Associates Inc | 88,101 | $1.60M | 0.00% | +25,975+41.8% | Added |
| JPMorgan Chase & Co | 87,714 | $1.60M | 0.00% | −25,960−22.8% | Reduced |
| Crestwood Advisors Group LLC | 80,559 | $1.47M | 0.03% | −12,963−13.9% | Reduced |
| State of Alaska, Department of Revenue | 79,345 | $1.44M | 0.02% | +8,898+12.6% | Added |