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, Q4 2025
Institutional positions in Amentum Holdings, Inc. as of Dec 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
- 483
- +31 vs. Q3 2025
- Shares held
- 203.8M
- +10.7M (+5.5%) vs. Q3 2025
- Total value
- $5.64B
- +$1.01B (+21.9%) vs. Q3 2025
- New holders
- 88
- 132 more added
- Sold out
- 57
- 159 more reduced
10 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Dover Advisors, LLC | 22,219 | $644.4K | 0.25% | +4,934+28.5% | Added |
| Stephens Inc | 22,555 | $654.1K | 0.01% | −3,401−13.1% | Reduced |
| Neville Rodie & Shaw Inc | 23,928 | $694.0K | 0.05% | −2,514−9.5% | Reduced |
| Peak Asset Management, LLC | 24,000 | $696.0K | 0.12% | 00.0% | Unchanged |
| Quest Partners LLC | 24,111 | $699.2K | 0.04% | 00.0% | Unchanged |
| Alpine Global Management, LLC | 25,000 | $725.0K | 0.16% | −50,000−66.7% | Reduced |
| Pictet Asset Management Holding SA | 25,252 | $732.3K | 0.00% | +2,062+8.9% | Added |
| US Bancorp | 25,600 | $742.4K | 0.00% | −566−2.2% | Reduced |
| Sit Investment Associates Inc | 26,202 | $760.0K | 0.01% | 00.0% | Unchanged |
| Security National Bank of So Dak | 26,642 | $772.6K | 0.38% | −144−0.5% | Reduced |
| Bryn Mawr Trust Co | 26,869 | $779.2K | 0.02% | +6,291+30.6% | Added |
| National Philanthropic Trust | 27,437 | $795.7K | 0.01% | −6,390−18.9% | Reduced |
| Group One Trading, L.P. | 28,498 | $826.4K | 0.02% | +7,891+38.3% | Added |
| Advisor Group Holdings, Inc. | 29,126 | $844.7K | 0.00% | +2,537+9.5% | Added |
| American Trust Investment Advisors, LLC | 29,175 | $846.1K | 0.45% | −1,308−4.3% | Reduced |
| Maryland State Retirement & Pension System | 29,913 | $867.5K | 0.02% | +462+1.6% | Added |
| Stifel Financial Corp | 30,550 | $886.0K | 0.00% | −4,908−13.8% | Reduced |
| Dynamic Technology Lab Private Ltd | 30,863 | $895.0K | 0.20% | +12,405+67.2% | Added |
| Dba Trading, LLC | 31,196 | $904.7K | 0.90% | +31,196 | New |
| Pathstone Holdings, LLC | 31,926 | $925.9K | 0.00% | +17,501+121.3% | Added |
| Captrust Financial Advisors | 31,935 | $926.1K | 0.00% | +2,262+7.6% | Added |
| Oak Thistle LLC | 32,956 | $955.7K | 0.13% | +32,956 | New |
| Landscape Capital Management, L.L.C. | 32,981 | $956.4K | 0.06% | +32,981 | New |
| Canada Pension Plan Investment Board | 32,994 | $956.8K | 0.00% | +24,900+307.6% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 33,224 | $963.5K | 0.00% | −4,572−12.1% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 33,438 | $969.7K | 0.00% | +3,900+13.2% | Added |
| Toroso Investments, LLC | 33,961 | $984.9K | 0.00% | +13,663+67.3% | Added |
| Tower Bridge Advisors | 34,182 | $991.3K | 0.10% | −3,022−8.1% | Reduced |
| Brevan Howard Capital Management LP | 35,018 | $1.02M | 0.02% | +35,018 | New |
| Marshall Wace, LLP | 35,084 | $1.02M | 0.00% | +35,084 | New |
| Oregon Public Employees Retirement Fund | 35,100 | $1.02M | 0.01% | +600+1.7% | Added |
| Williams Jones Wealth Management, LLC. | 35,492 | $1.03M | 0.01% | −1,217−3.3% | Reduced |
| Nisa Investment Advisors, LLC | 35,756 | $1.04M | 0.00% | −99−0.3% | Reduced |
| Teacher Retirement System of Texas | 35,831 | $1.04M | 0.00% | −18,170−33.6% | Reduced |
| Clear Harbor Asset Management, LLC | 36,275 | $1.05M | 0.07% | −3,728−9.3% | Reduced |
| Jones Financial Companies LLLP | 36,284 | $1.05M | 0.00% | +2,663+7.9% | Added |
| Capital Fund Management S.A. | 36,812 | $1.07M | 0.01% | +36,812 | New |
| Manufacturers Life Insurance Company, The | 36,919 | $1.07M | 0.00% | +1,296+3.6% | Added |
| CI Private Wealth, LLC | 36,949 | $1.07M | 0.00% | −2,102−5.4% | Reduced |
| Teachers Retirement System of the State of Kentucky | 37,772 | $1.10M | 0.01% | −4,616−10.9% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 37,951 | $1.10M | 0.01% | −1,089−2.8% | Reduced |
| Ieq Capital, LLC | 38,025 | $1.10M | 0.00% | +38,025 | New |
| Versor Investments LP | 42,809 | $1.24M | 0.19% | −102−0.2% | Reduced |
| Paragon Capital Management LLC | 43,730 | $1.27M | 0.64% | −4,340−9.0% | Reduced |
| Atom Investors LP | 43,737 | $1.27M | 0.10% | −100,544−69.7% | Reduced |
| Arizona State Retirement System | 43,860 | $1.27M | 0.01% | −2,941−6.3% | Reduced |
| CWM, LLC | 44,614 | $1.29M | 0.00% | +29,068+187.0% | Added |
| XTX Topco Ltd | 44,821 | $1.30M | 0.03% | −4,444−9.0% | Reduced |
| Creative Planning | 44,834 | $1.30M | 0.00% | +8,721+24.1% | Added |
| Yousif Capital Management, LLC | 38,091 | $1.31M | 0.01% | −5,506−12.6% | Reduced |
| Hikari Tsushin, Inc. | 45,403 | $1.32M | 0.09% | 00.0% | Unchanged |
| Victory Capital Management Inc | 46,996 | $1.36M | 0.00% | +18,088+62.6% | Added |
| Mariner, LLC | 48,837 | $1.42M | 0.00% | +8,195+20.2% | Added |
| Delphi Management Inc | 49,094 | $1.42M | 1.39% | +49,094 | New |
| Public Employees Retirement System of Ohio | 49,232 | $1.43M | 0.00% | −2,104−4.1% | Reduced |
| Barclays PLC | 50,375 | $1.46M | 0.00% | −3,287−6.1% | Reduced |
| Steadtrust LLC | 50,400 | $1.46M | 0.90% | +50,400 | New |
| Cerity Partners LLC | 51,694 | $1.50M | 0.00% | +18,480+55.6% | Added |
| Amalgamated Bank | 54,267 | $1.57M | 0.01% | +6,706+14.1% | Added |
| Citadel Advisors LLC | 55,585 | $1.61M | 0.00% | −62,385−52.9% | Reduced |
| State of Tennessee, Treasury Department | 46,262 | $1.66M | 0.01% | −18,660−28.7% | Reduced |
| Natixis Advisors, L.P. | 57,593 | $1.67M | 0.00% | −9,071−13.6% | Reduced |
| Crestwood Advisors Group LLC | 59,939 | $1.74M | 0.03% | −17,593−22.7% | Reduced |
| Millennium Management LLC | 61,187 | $1.77M | 0.00% | −579,612−90.5% | Reduced |
| Hahn Capital Management LLC | 61,962 | $1.80M | 0.97% | −3,800−5.8% | Reduced |
| Mraz, Amerine & Associates, Inc. | 64,228 | $1.86M | 0.28% | +35,033+120.0% | Added |
| Police & Firemen's Retirement System of New Jersey | 66,654 | $1.93M | 0.02% | −4,994−7.0% | Reduced |
| Treasurer of the State of North Carolina | 66,707 | $1.94M | 0.01% | −4,874−6.8% | Reduced |
| Envestnet Asset Management Inc | 67,697 | $1.96M | 0.00% | −21,893−24.4% | Reduced |
| Wolverine Asset Management LLC | 68,040 | $1.97M | 0.03% | 00.0% | Unchanged |
| Janus Henderson Group PLC | 69,400 | $2.01M | 0.00% | 00.0% | Unchanged |
| Resolute Capital Asset Partners LLC | 70,000 | $2.03M | 0.98% | +70,000 | New |
| Louisiana State Employees Retirement System | 70,200 | $2.04M | 0.03% | −300−0.4% | Reduced |
| Ridge Creek Global, Inc | 70,888 | $2.06M | 1.72% | +70,888 | New |
| Alliancebernstein L.P. | 71,273 | $2.07M | 0.00% | −98,453−58.0% | Reduced |
| Pine Valley Investments Ltd Liability Co | 75,894 | $2.20M | 0.11% | +2,197+3.0% | Added |
| Quantinno Capital Management LP | 77,971 | $2.26M | 0.00% | +12,920+19.9% | Added |
| State of Alaska, Department of Revenue | 78,110 | $2.27M | 0.02% | +974+1.3% | Added |
| Citigroup Inc | 79,008 | $2.29M | 0.00% | +2,299+3.0% | Added |
| Holocene Advisors, LP | 79,321 | $2.30M | 0.00% | +33,507+73.1% | Added |
| Blair William & Co | 79,965 | $2.32M | 0.01% | +29,316+57.9% | Added |
| CSM Advisors, LLC | 84,759 | $2.46M | 0.07% | −118,048−58.2% | Reduced |
| LPL Financial LLC | 86,678 | $2.51M | 0.00% | −4,050−4.5% | Reduced |
| JPMorgan Chase & Co | 89,291 | $2.59M | 0.00% | −15,480−14.8% | Reduced |
| Gamco Investors, Inc. Et Al | 91,861 | $2.66M | 0.03% | −7,782−7.8% | Reduced |
| North Growth Management Ltd. | 98,000 | $2.83M | 0.44% | +1,000+1.0% | Added |
| State of New Jersey Common Pension Fund D | 98,984 | $2.87M | 0.01% | +11,342+12.9% | Added |
| Blackstone Group Inc. | 99,643 | $2.89M | 0.01% | +50,537+102.9% | Added |
| Winton Group Ltd | 101,449 | $2.94M | 0.10% | +48,040+89.9% | Added |
| WSFS Capital Management, LLC | 101,949 | $2.96M | 0.14% | +22,306+28.0% | Added |
| State of Wisconsin Investment Board | 103,682 | $3.01M | 0.01% | +12,284+13.4% | Added |
| Soros Fund Management LLCSuperinvestorSoros Fund Management | 109,303 | $3.17M | 0.04% | +109,303 | New |
| Caption Management, LLC | 116,500 | $3.38M | 0.15% | +75,400+183.5% | Added |
| State Board of Administration of Florida Retirement System | 120,865 | $3.51M | 0.01% | 00.0% | Unchanged |
| South Dakota Investment Council | 123,037 | $3.57M | 0.07% | +58,617+91.0% | Added |
| Price T Rowe Associates Inc | 129,482 | $3.76M | 0.00% | +11,307+9.6% | Added |
| Twinbeech Capital LP | 137,453 | $3.99M | 0.28% | −85,254−38.3% | Reduced |
| Prudential Financial Inc | 142,422 | $4.13M | 0.00% | −4,776−3.2% | Reduced |
| Qube Research & Technologies Ltd | 146,182 | $4.24M | 0.01% | +146,182 | New |
| California State Teachers Retirement System | 149,912 | $4.35M | 0.00% | −12,418−7.6% | Reduced |