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 $4.34B in total; Soros Fund Management is the only superinvestor holding it.
13F holders, Q3 2025
Institutional positions in Amentum Holdings, Inc. as of Sep 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
- 462
- +7 vs. Q2 2025
- Shares held
- 193.4M
- −4.76M (−2.4%) vs. Q2 2025
- Total value
- $4.63B
- −$48.2M (−1.0%) vs. Q2 2025
- New holders
- 76
- 104 more added
- Sold out
- 69
- 179 more reduced
6 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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 | $4.34B |
| Q1 2026 | 486 | $5.28B |
| Q4 2025 | 483 | $5.64B |
| Q3 2025 | 462 | $4.63B |
| Q2 2025 | 461 | $4.73B |
| Q1 2025 | 418 | $3.49B |
| Q4 2024 | 451 | $3.48B |
| Q3 2024 | 492 | $3.23B |
| 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, Q3 2025
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| American Trust Investment Advisors, LLC | 30,483 | $730.1K | 0.38% | −2,769−8.3% | Reduced |
| Advisors Asset Management, Inc. | 31,064 | $744.0K | 0.01% | −14,119−31.2% | Reduced |
| Jones Financial Companies LLLP | 33,621 | $766.3K | 0.00% | +3,465+11.5% | Added |
| Colony Group, LLC | 32,616 | $780.2K | 0.00% | −4,318−11.7% | Reduced |
| Massar Capital Management, LP | 33,183 | $794.7K | 0.28% | +33,183 | New |
| Cerity Partners LLC | 33,214 | $795.5K | 0.00% | −11,902−26.4% | Reduced |
| National Philanthropic Trust | 33,827 | $810.2K | 0.01% | 00.0% | Unchanged |
| Oregon Public Employees Retirement Fund | 34,500 | $826.3K | 0.01% | +100+0.3% | Added |
| Stifel Financial Corp | 35,458 | $849.3K | 0.00% | +2,453+7.4% | Added |
| Manufacturers Life Insurance Company, The | 35,623 | $853.2K | 0.00% | −740−2.0% | Reduced |
| Nisa Investment Advisors, LLC | 35,855 | $858.7K | 0.00% | +2,225+6.6% | Added |
| Balyasny Asset Management LLC | 36,010 | $862.4K | 0.00% | +36,010 | New |
| Creative Planning | 36,113 | $864.9K | 0.00% | +1,812+5.3% | Added |
| Williams Jones Wealth Management, LLC. | 36,709 | $879.2K | 0.01% | −10,951−23.0% | Reduced |
| Tower Bridge Advisors | 37,204 | $891.0K | 0.09% | +1,146+3.2% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 37,796 | $905.2K | 0.00% | −45,973−54.9% | Reduced |
| EntryPoint Capital, LLC | 38,211 | $915.2K | 0.35% | +29,108+319.8% | Added |
| First Trust Advisors LP | 38,590 | $924.2K | 0.00% | +38,590 | New |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 39,040 | $935.0K | 0.00% | +308+0.8% | Added |
| CI Private Wealth, LLC | 39,051 | $935.3K | 0.00% | −9,333−19.3% | Reduced |
| Kerrisdale Advisers, LLC | 39,520 | $946.5K | 0.49% | +39,520 | New |
| Clear Harbor Asset Management, LLC | 40,003 | $958.1K | 0.07% | −50−0.1% | Reduced |
| Mariner, LLC | 40,642 | $973.4K | 0.00% | −2,347−5.5% | Reduced |
| Caption Management, LLC | 41,100 | $984.3K | 0.06% | +41,100 | New |
| Teachers Retirement System of the State of Kentucky | 42,388 | $1.01M | 0.01% | −8,948−17.4% | Reduced |
| Versor Investments LP | 42,911 | $1.03M | 0.19% | −19,111−30.8% | Reduced |
| Wells Fargo & Company | 43,434 | $1.04M | 0.00% | +3,228+8.0% | Added |
| Yousif Capital Management, LLC | 43,597 | $1.04M | 0.01% | −13,369−23.5% | Reduced |
| Hikari Tsushin, Inc. | 45,403 | $1.09M | 0.07% | 00.0% | Unchanged |
| Holocene Advisors, LP | 45,814 | $1.10M | 0.00% | +45,814 | New |
| Arizona State Retirement System | 46,801 | $1.12M | 0.01% | +648+1.4% | Added |
| Amalgamated Bank | 47,561 | $1.14M | 0.01% | +1,726+3.8% | Added |
| Paragon Capital Management LLC | 48,070 | $1.15M | 0.56% | −640−1.3% | Reduced |
| Blackstone Group Inc. | 49,106 | $1.18M | 0.01% | +49,106 | New |
| Tudor Investment Corp Et Al | 49,133 | $1.18M | 0.01% | +49,133 | New |
| XTX Topco Ltd | 49,265 | $1.18M | 0.06% | −15,458−23.9% | Reduced |
| Blair William & Co | 50,649 | $1.21M | 0.00% | −5,919−10.5% | Reduced |
| Public Employees Retirement System of Ohio | 51,336 | $1.23M | 0.00% | +32+0.1% | Added |
| Winton Group Ltd | 53,409 | $1.28M | 0.05% | −59,012−52.5% | Reduced |
| Barclays PLC | 53,662 | $1.29M | 0.00% | +4,423+9.0% | Added |
| Teacher Retirement System of Texas | 54,001 | $1.29M | 0.01% | −10,844−16.7% | Reduced |
| Susquehanna Fundamental Investments, LLC | 54,337 | $1.30M | 0.05% | +54,337 | New |
| South Dakota Investment Council | 64,420 | $1.54M | 0.03% | +64,420 | New |
| State of Tennessee, Treasury Department | 64,922 | $1.55M | 0.01% | +2,268+3.6% | Added |
| Quantinno Capital Management LP | 65,051 | $1.56M | 0.00% | +13,508+26.2% | Added |
| Hahn Capital Management LLC | 65,762 | $1.57M | 0.75% | −2,986−4.3% | Reduced |
| Natixis Advisors, L.P. | 66,664 | $1.60M | 0.00% | −413−0.6% | Reduced |
| Wolverine Asset Management LLC | 68,040 | $1.63M | 0.02% | 00.0% | Unchanged |
| Cubist Systematic Strategies, LLC | 68,478 | $1.64M | 0.02% | +68,478 | New |
| Janus Henderson Group PLC | 69,400 | $1.66M | 0.00% | 00.0% | Unchanged |
| Louisiana State Employees Retirement System | 70,500 | $1.69M | 0.03% | 00.0% | Unchanged |
| Treasurer of the State of North Carolina | 71,581 | $1.71M | 0.01% | −2,787−3.7% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 71,648 | $1.72M | 0.01% | +11,257+18.6% | Added |
| Pine Valley Investments Ltd Liability Co | 73,697 | $1.77M | 0.09% | +29,079+65.2% | Added |
| Alpine Global Management, LLC | 75,000 | $1.80M | 0.37% | −56−0.1% | Reduced |
| Oppenheimer & Co Inc | 75,483 | $1.81M | 0.02% | +66,320+723.8% | Added |
| Citigroup Inc | 76,709 | $1.84M | 0.00% | −53,155−40.9% | Reduced |
| State of Alaska, Department of Revenue | 77,136 | $1.85M | 0.02% | −12,696−14.1% | Reduced |
| Crestwood Advisors Group LLC | 77,532 | $1.86M | 0.03% | −4,242−5.2% | Reduced |
| WSFS Capital Management, LLC | 79,643 | $1.91M | 0.09% | +6,915+9.5% | Added |
| Illinois Municipal Retirement Fund | 82,628 | $1.98M | 0.03% | +7,176+9.5% | Added |
| State of New Jersey Common Pension Fund D | 87,642 | $2.10M | 0.01% | −12,462−12.4% | Reduced |
| Envestnet Asset Management Inc | 89,590 | $2.15M | 0.00% | −7,195−7.4% | Reduced |
| LPL Financial LLC | 90,728 | $2.17M | 0.00% | −50.0% | Reduced |
| State of Wisconsin Investment Board | 91,398 | $2.19M | 0.01% | −459−0.5% | Reduced |
| Dark Forest Capital Management LP | 95,866 | $2.30M | 0.09% | +95,866 | New |
| North Growth Management Ltd. | 97,000 | $2.31M | 0.40% | 00.0% | Unchanged |
| Gamco Investors, Inc. Et Al | 99,643 | $2.39M | 0.02% | −9,027−8.3% | Reduced |
| JPMorgan Chase & Co | 104,771 | $2.51M | 0.00% | +13,449+14.7% | Added |
| ExodusPoint Capital Management, LP | 106,188 | $2.54M | 0.04% | +96,387+983.4% | Added |
| Citadel Advisors LLC | 117,970 | $2.83M | 0.00% | −224,929−65.6% | Reduced |
| Price T Rowe Associates Inc | 118,175 | $2.83M | 0.00% | +12,028+11.3% | Added |
| State Board of Administration of Florida Retirement System | 120,865 | $2.89M | 0.01% | −1,501−1.2% | Reduced |
| Engineers Gate Manager LP | 125,542 | $3.01M | 0.03% | +125,542 | New |
| Ancora Advisors, LLC | 133,874 | $3.21M | 0.06% | +1,670+1.3% | Added |
| Raymond James Financial Inc | 139,403 | $3.34M | 0.00% | −50,407−26.6% | Reduced |
| New York State Teachers Retirement System | 140,918 | $3.38M | 0.01% | +3,483+2.5% | Added |
| Atom Investors LP | 144,281 | $3.46M | 0.26% | +144,281 | New |
| Prudential Financial Inc | 147,198 | $3.53M | 0.00% | −2,810−1.9% | Reduced |
| Soviero Asset Management, LP | 155,000 | $3.71M | 2.29% | +45,000+40.9% | Added |
| Wealth Enhancement Advisory Services, LLC | 150,345 | $3.80M | 0.01% | −4,759−3.1% | Reduced |
| Two Sigma Advisers, LP | 159,168 | $3.81M | 0.01% | +159,168 | New |
| California State Teachers Retirement System | 162,330 | $3.89M | 0.00% | +330.0% | Added |
| Country Club Bank | 172,462 | $3.94M | 0.23% | +144+0.1% | Added |
| AQR Capital Management LLC | 165,205 | $3.96M | 0.00% | −184,998−52.8% | Reduced |
| Alliancebernstein L.P. | 169,726 | $4.06M | 0.00% | −178,958−51.3% | Reduced |
| Hudson Value Partners, LLC | 185,825 | $4.45M | 1.40% | +124+0.1% | Added |
| HRT Financial LP | 186,223 | $4.46M | 0.02% | +186,223 | New |
| Telos Capital Management, Inc. | 189,859 | $4.55M | 0.44% | −30,859−14.0% | Reduced |
| SEI Investments Co | 200,523 | $4.80M | 0.01% | −18,603−8.5% | Reduced |
| CSM Advisors, LLC | 202,807 | $4.86M | 0.14% | −430,241−68.0% | Reduced |
| Algert Global LLC | 221,610 | $5.31M | 0.09% | +197,730+828.0% | Added |
| Twinbeech Capital LP | 222,707 | $5.33M | 0.21% | +222,707 | New |
| UBS Group AG | 231,190 | $5.54M | 0.00% | −535,114−69.8% | Reduced |
| California Public Employees Retirement System | 232,009 | $5.56M | 0.00% | +3,088+1.3% | Added |
| AWH Capital, L.P. | 235,250 | $5.63M | 5.88% | +70,000+42.4% | Added |
| Royal Bank of Canada | 242,056 | $5.80M | 0.00% | −201,144−45.4% | Reduced |
| Gotham Asset Management, LLC | 244,826 | $5.86M | 0.03% | +244,826 | New |
| Trexquant Investment LP | 255,748 | $6.13M | 0.06% | +255,748 | New |
| Exchange Traded Concepts, LLC | 267,494 | $6.41M | 0.06% | +264,162+7,928.0% | Added |