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 |
|---|---|---|---|---|---|
| Illinois Municipal Retirement Fund | 82,628 | $1.98M | 0.03% | +7,176+9.5% | Added |
| WSFS Capital Management, LLC | 79,643 | $1.91M | 0.09% | +6,915+9.5% | Added |
| Crestwood Advisors Group LLC | 77,532 | $1.86M | 0.03% | −4,242−5.2% | Reduced |
| State of Alaska, Department of Revenue | 77,136 | $1.85M | 0.02% | −12,696−14.1% | Reduced |
| Citigroup Inc | 76,709 | $1.84M | 0.00% | −53,155−40.9% | Reduced |
| Oppenheimer & Co Inc | 75,483 | $1.81M | 0.02% | +66,320+723.8% | Added |
| Alpine Global Management, LLC | 75,000 | $1.80M | 0.37% | −56−0.1% | Reduced |
| Pine Valley Investments Ltd Liability Co | 73,697 | $1.77M | 0.09% | +29,079+65.2% | Added |
| Police & Firemen's Retirement System of New Jersey | 71,648 | $1.72M | 0.01% | +11,257+18.6% | Added |
| Treasurer of the State of North Carolina | 71,581 | $1.71M | 0.01% | −2,787−3.7% | Reduced |
| Louisiana State Employees Retirement System | 70,500 | $1.69M | 0.03% | 00.0% | Unchanged |
| Janus Henderson Group PLC | 69,400 | $1.66M | 0.00% | 00.0% | Unchanged |
| Cubist Systematic Strategies, LLC | 68,478 | $1.64M | 0.02% | +68,478 | New |
| Wolverine Asset Management LLC | 68,040 | $1.63M | 0.02% | 00.0% | Unchanged |
| Natixis Advisors, L.P. | 66,664 | $1.60M | 0.00% | −413−0.6% | Reduced |
| Hahn Capital Management LLC | 65,762 | $1.57M | 0.75% | −2,986−4.3% | Reduced |
| Quantinno Capital Management LP | 65,051 | $1.56M | 0.00% | +13,508+26.2% | Added |
| State of Tennessee, Treasury Department | 64,922 | $1.55M | 0.01% | +2,268+3.6% | Added |
| South Dakota Investment Council | 64,420 | $1.54M | 0.03% | +64,420 | New |
| Susquehanna Fundamental Investments, LLC | 54,337 | $1.30M | 0.05% | +54,337 | New |
| Teacher Retirement System of Texas | 54,001 | $1.29M | 0.01% | −10,844−16.7% | Reduced |
| Barclays PLC | 53,662 | $1.29M | 0.00% | +4,423+9.0% | Added |
| Winton Group Ltd | 53,409 | $1.28M | 0.05% | −59,012−52.5% | Reduced |
| Public Employees Retirement System of Ohio | 51,336 | $1.23M | 0.00% | +32+0.1% | Added |
| Blair William & Co | 50,649 | $1.21M | 0.00% | −5,919−10.5% | Reduced |
| XTX Topco Ltd | 49,265 | $1.18M | 0.06% | −15,458−23.9% | Reduced |
| Tudor Investment Corp Et Al | 49,133 | $1.18M | 0.01% | +49,133 | New |
| Blackstone Group Inc. | 49,106 | $1.18M | 0.01% | +49,106 | New |
| Paragon Capital Management LLC | 48,070 | $1.15M | 0.56% | −640−1.3% | Reduced |
| Amalgamated Bank | 47,561 | $1.14M | 0.01% | +1,726+3.8% | Added |
| Arizona State Retirement System | 46,801 | $1.12M | 0.01% | +648+1.4% | Added |
| Holocene Advisors, LP | 45,814 | $1.10M | 0.00% | +45,814 | New |
| Hikari Tsushin, Inc. | 45,403 | $1.09M | 0.07% | 00.0% | Unchanged |
| Yousif Capital Management, LLC | 43,597 | $1.04M | 0.01% | −13,369−23.5% | Reduced |
| Wells Fargo & Company | 43,434 | $1.04M | 0.00% | +3,228+8.0% | Added |
| Versor Investments LP | 42,911 | $1.03M | 0.19% | −19,111−30.8% | Reduced |
| Teachers Retirement System of the State of Kentucky | 42,388 | $1.01M | 0.01% | −8,948−17.4% | Reduced |
| Caption Management, LLC | 41,100 | $984.3K | 0.06% | +41,100 | New |
| Mariner, LLC | 40,642 | $973.4K | 0.00% | −2,347−5.5% | Reduced |
| Clear Harbor Asset Management, LLC | 40,003 | $958.1K | 0.07% | −50−0.1% | Reduced |
| Kerrisdale Advisers, LLC | 39,520 | $946.5K | 0.49% | +39,520 | New |
| CI Private Wealth, LLC | 39,051 | $935.3K | 0.00% | −9,333−19.3% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 39,040 | $935.0K | 0.00% | +308+0.8% | Added |
| First Trust Advisors LP | 38,590 | $924.2K | 0.00% | +38,590 | New |
| EntryPoint Capital, LLC | 38,211 | $915.2K | 0.35% | +29,108+319.8% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 37,796 | $905.2K | 0.00% | −45,973−54.9% | Reduced |
| Tower Bridge Advisors | 37,204 | $891.0K | 0.09% | +1,146+3.2% | Added |
| Williams Jones Wealth Management, LLC. | 36,709 | $879.2K | 0.01% | −10,951−23.0% | Reduced |
| Creative Planning | 36,113 | $864.9K | 0.00% | +1,812+5.3% | Added |
| Balyasny Asset Management LLC | 36,010 | $862.4K | 0.00% | +36,010 | New |
| Nisa Investment Advisors, LLC | 35,855 | $858.7K | 0.00% | +2,225+6.6% | Added |
| Manufacturers Life Insurance Company, The | 35,623 | $853.2K | 0.00% | −740−2.0% | Reduced |
| Stifel Financial Corp | 35,458 | $849.3K | 0.00% | +2,453+7.4% | Added |
| Oregon Public Employees Retirement Fund | 34,500 | $826.3K | 0.01% | +100+0.3% | Added |
| National Philanthropic Trust | 33,827 | $810.2K | 0.01% | 00.0% | Unchanged |
| Cerity Partners LLC | 33,214 | $795.5K | 0.00% | −11,902−26.4% | Reduced |
| Massar Capital Management, LP | 33,183 | $794.7K | 0.28% | +33,183 | New |
| Colony Group, LLC | 32,616 | $780.2K | 0.00% | −4,318−11.7% | Reduced |
| Jones Financial Companies LLLP | 33,621 | $766.3K | 0.00% | +3,465+11.5% | Added |
| Advisors Asset Management, Inc. | 31,064 | $744.0K | 0.01% | −14,119−31.2% | Reduced |
| American Trust Investment Advisors, LLC | 30,483 | $730.1K | 0.38% | −2,769−8.3% | Reduced |
| Ensign Peak Advisors, Inc | 29,986 | $718.2K | 0.00% | −10,600−26.1% | Reduced |
| Captrust Financial Advisors | 29,673 | $710.7K | 0.00% | −1,142−3.7% | Reduced |
| Sciencast Management LP | 29,673 | $710.7K | 0.13% | +29,673 | New |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 29,538 | $707.4K | 0.00% | +2,700+10.1% | Added |
| Maryland State Retirement & Pension System | 29,451 | $705.4K | 0.01% | −22,355−43.2% | Reduced |
| Mraz, Amerine & Associates, Inc. | 29,195 | $699.2K | 0.11% | +20,645+241.5% | Added |
| SG Americas Securities, LLC | 29,064 | $696.0K | 0.00% | +21,182+268.7% | Added |
| Victory Capital Management Inc | 28,908 | $692.3K | 0.00% | −4,800−14.2% | Reduced |
| Clifford Swan Investment Counsel LLC | 28,072 | $672.3K | 0.02% | −504−1.8% | Reduced |
| Advisor Group Holdings, Inc. | 26,589 | $645.4K | 0.00% | +4,596+20.9% | Added |
| Security National Bank of So Dak | 26,786 | $641.5K | 0.32% | −54−0.2% | Reduced |
| Susquehanna International Group, LLP | 26,467 | $633.9K | 0.00% | −20,240−43.3% | Reduced |
| Neville Rodie & Shaw Inc | 26,442 | $633.0K | 0.05% | −3,000−10.2% | Reduced |
| Sit Investment Associates Inc | 26,202 | $628.0K | 0.01% | 00.0% | Unchanged |
| US Bancorp | 26,166 | $626.7K | 0.00% | +44+0.2% | Added |
| Stephens Inc | 25,956 | $621.6K | 0.01% | −1,944−7.0% | Reduced |
| Iat Reinsurance Co Ltd. | 24,693 | $591.4K | 0.12% | 00.0% | Unchanged |
| Quest Partners LLC | 24,111 | $577.5K | 0.04% | +24,111 | New |
| Peak Asset Management, LLC | 24,000 | $574.8K | 0.10% | 00.0% | Unchanged |
| Carlson Capital L P | 24,000 | $574.8K | 0.33% | +24,000 | New |
| Lecap Asset Management Ltd | 23,438 | $561.3K | 0.20% | +23,438 | New |
| Gsa Capital Partners LLP | 23,285 | $558.0K | 0.05% | +23,285 | New |
| Cetera Investment Advisers | 23,209 | $555.9K | 0.00% | +9,030+63.7% | Added |
| Pictet Asset Management Holding SA | 23,190 | $555.4K | 0.00% | −10.0% | Reduced |
| Lathrop Investment Management Corp | 22,817 | $546.0K | 0.10% | −4,994−18.0% | Reduced |
| Modera Wealth Management, LLC | 22,760 | $545.1K | 0.01% | −3,464−13.2% | Reduced |
| Gabelli Funds LLC | 22,288 | $533.8K | 0.00% | −2,765−11.0% | Reduced |
| Qsemble Capital Management, LP | 21,929 | $525.2K | 0.05% | +21,929 | New |
| Counterpoint Mutual Funds LLC | 21,913 | $524.8K | 0.04% | +21,913 | New |
| Bank of Montreal | 21,614 | $517.7K | 0.00% | −19,055−46.9% | Reduced |
| Group One Trading, L.P. | 20,607 | $493.5K | 0.01% | −47,301−69.7% | Reduced |
| Bryn Mawr Trust Co | 20,578 | $492.8K | 0.01% | −271−1.3% | Reduced |
| Toroso Investments, LLC | 20,298 | $486.1K | 0.00% | +10,868+115.2% | Added |
| DRW Securities, LLC | 20,061 | $478.8K | 0.02% | +20,061 | New |
| Wellington Management Group LLP | 19,688 | $471.5K | 0.00% | −41,090−67.6% | Reduced |
| Security National Bank of Sioux City Iowa | 19,331 | $463.0K | 0.30% | +58+0.3% | Added |
| Truist Financial Corp | 19,237 | $460.7K | 0.00% | −3,279−14.6% | Reduced |
| IMC-Chicago, LLC | 19,237 | $460.7K | 0.01% | +3,527+22.5% | Added |
| Deutsche Bank AG | 18,733 | $448.7K | 0.00% | +1,334+7.7% | Added |