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 |
|---|---|---|---|---|---|
| LPL Financial LLC | 86,678 | $2.51M | 0.00% | −4,050−4.5% | Reduced |
| CSM Advisors, LLC | 84,759 | $2.46M | 0.07% | −118,048−58.2% | Reduced |
| Blair William & Co | 79,965 | $2.32M | 0.01% | +29,316+57.9% | Added |
| Holocene Advisors, LP | 79,321 | $2.30M | 0.00% | +33,507+73.1% | Added |
| Citigroup Inc | 79,008 | $2.29M | 0.00% | +2,299+3.0% | Added |
| State of Alaska, Department of Revenue | 78,110 | $2.27M | 0.02% | +974+1.3% | Added |
| Quantinno Capital Management LP | 77,971 | $2.26M | 0.00% | +12,920+19.9% | Added |
| Pine Valley Investments Ltd Liability Co | 75,894 | $2.20M | 0.11% | +2,197+3.0% | Added |
| Alliancebernstein L.P. | 71,273 | $2.07M | 0.00% | −98,453−58.0% | Reduced |
| Ridge Creek Global, Inc | 70,888 | $2.06M | 1.72% | +70,888 | New |
| Louisiana State Employees Retirement System | 70,200 | $2.04M | 0.03% | −300−0.4% | Reduced |
| Resolute Capital Asset Partners LLC | 70,000 | $2.03M | 0.98% | +70,000 | New |
| Janus Henderson Group PLC | 69,400 | $2.01M | 0.00% | 00.0% | Unchanged |
| Wolverine Asset Management LLC | 68,040 | $1.97M | 0.03% | 00.0% | Unchanged |
| Envestnet Asset Management Inc | 67,697 | $1.96M | 0.00% | −21,893−24.4% | Reduced |
| Treasurer of the State of North Carolina | 66,707 | $1.94M | 0.01% | −4,874−6.8% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 66,654 | $1.93M | 0.02% | −4,994−7.0% | Reduced |
| Mraz, Amerine & Associates, Inc. | 64,228 | $1.86M | 0.28% | +35,033+120.0% | Added |
| Hahn Capital Management LLC | 61,962 | $1.80M | 0.97% | −3,800−5.8% | Reduced |
| Millennium Management LLC | 61,187 | $1.77M | 0.00% | −579,612−90.5% | Reduced |
| Crestwood Advisors Group LLC | 59,939 | $1.74M | 0.03% | −17,593−22.7% | Reduced |
| Natixis Advisors, L.P. | 57,593 | $1.67M | 0.00% | −9,071−13.6% | Reduced |
| State of Tennessee, Treasury Department | 46,262 | $1.66M | 0.01% | −18,660−28.7% | Reduced |
| Citadel Advisors LLC | 55,585 | $1.61M | 0.00% | −62,385−52.9% | Reduced |
| Amalgamated Bank | 54,267 | $1.57M | 0.01% | +6,706+14.1% | Added |
| Cerity Partners LLC | 51,694 | $1.50M | 0.00% | +18,480+55.6% | Added |
| Steadtrust LLC | 50,400 | $1.46M | 0.90% | +50,400 | New |
| Barclays PLC | 50,375 | $1.46M | 0.00% | −3,287−6.1% | Reduced |
| Public Employees Retirement System of Ohio | 49,232 | $1.43M | 0.00% | −2,104−4.1% | Reduced |
| Delphi Management Inc | 49,094 | $1.42M | 1.39% | +49,094 | New |
| Mariner, LLC | 48,837 | $1.42M | 0.00% | +8,195+20.2% | Added |
| Victory Capital Management Inc | 46,996 | $1.36M | 0.00% | +18,088+62.6% | Added |
| Hikari Tsushin, Inc. | 45,403 | $1.32M | 0.09% | 00.0% | Unchanged |
| Yousif Capital Management, LLC | 38,091 | $1.31M | 0.01% | −5,506−12.6% | Reduced |
| Creative Planning | 44,834 | $1.30M | 0.00% | +8,721+24.1% | Added |
| XTX Topco Ltd | 44,821 | $1.30M | 0.03% | −4,444−9.0% | Reduced |
| CWM, LLC | 44,614 | $1.29M | 0.00% | +29,068+187.0% | Added |
| Arizona State Retirement System | 43,860 | $1.27M | 0.01% | −2,941−6.3% | Reduced |
| Atom Investors LP | 43,737 | $1.27M | 0.10% | −100,544−69.7% | Reduced |
| Paragon Capital Management LLC | 43,730 | $1.27M | 0.64% | −4,340−9.0% | Reduced |
| Versor Investments LP | 42,809 | $1.24M | 0.19% | −102−0.2% | Reduced |
| Ieq Capital, LLC | 38,025 | $1.10M | 0.00% | +38,025 | New |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 37,951 | $1.10M | 0.01% | −1,089−2.8% | Reduced |
| Teachers Retirement System of the State of Kentucky | 37,772 | $1.10M | 0.01% | −4,616−10.9% | Reduced |
| CI Private Wealth, LLC | 36,949 | $1.07M | 0.00% | −2,102−5.4% | Reduced |
| Manufacturers Life Insurance Company, The | 36,919 | $1.07M | 0.00% | +1,296+3.6% | Added |
| Capital Fund Management S.A. | 36,812 | $1.07M | 0.01% | +36,812 | New |
| Jones Financial Companies LLLP | 36,284 | $1.05M | 0.00% | +2,663+7.9% | Added |
| Clear Harbor Asset Management, LLC | 36,275 | $1.05M | 0.07% | −3,728−9.3% | Reduced |
| Teacher Retirement System of Texas | 35,831 | $1.04M | 0.00% | −18,170−33.6% | Reduced |
| Nisa Investment Advisors, LLC | 35,756 | $1.04M | 0.00% | −99−0.3% | Reduced |
| Williams Jones Wealth Management, LLC. | 35,492 | $1.03M | 0.01% | −1,217−3.3% | Reduced |
| Oregon Public Employees Retirement Fund | 35,100 | $1.02M | 0.01% | +600+1.7% | Added |
| Marshall Wace, LLP | 35,084 | $1.02M | 0.00% | +35,084 | New |
| Brevan Howard Capital Management LP | 35,018 | $1.02M | 0.02% | +35,018 | New |
| Tower Bridge Advisors | 34,182 | $991.3K | 0.10% | −3,022−8.1% | Reduced |
| Toroso Investments, LLC | 33,961 | $984.9K | 0.00% | +13,663+67.3% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 33,438 | $969.7K | 0.00% | +3,900+13.2% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 33,224 | $963.5K | 0.00% | −4,572−12.1% | Reduced |
| Canada Pension Plan Investment Board | 32,994 | $956.8K | 0.00% | +24,900+307.6% | Added |
| Landscape Capital Management, L.L.C. | 32,981 | $956.4K | 0.06% | +32,981 | New |
| Oak Thistle LLC | 32,956 | $955.7K | 0.13% | +32,956 | New |
| Captrust Financial Advisors | 31,935 | $926.1K | 0.00% | +2,262+7.6% | Added |
| Pathstone Holdings, LLC | 31,926 | $925.9K | 0.00% | +17,501+121.3% | Added |
| Dba Trading, LLC | 31,196 | $904.7K | 0.90% | +31,196 | New |
| Dynamic Technology Lab Private Ltd | 30,863 | $895.0K | 0.20% | +12,405+67.2% | Added |
| Stifel Financial Corp | 30,550 | $886.0K | 0.00% | −4,908−13.8% | Reduced |
| Maryland State Retirement & Pension System | 29,913 | $867.5K | 0.02% | +462+1.6% | Added |
| American Trust Investment Advisors, LLC | 29,175 | $846.1K | 0.45% | −1,308−4.3% | Reduced |
| Advisor Group Holdings, Inc. | 29,126 | $844.7K | 0.00% | +2,537+9.5% | Added |
| Group One Trading, L.P. | 28,498 | $826.4K | 0.02% | +7,891+38.3% | Added |
| National Philanthropic Trust | 27,437 | $795.7K | 0.01% | −6,390−18.9% | Reduced |
| Bryn Mawr Trust Co | 26,869 | $779.2K | 0.02% | +6,291+30.6% | Added |
| Security National Bank of So Dak | 26,642 | $772.6K | 0.38% | −144−0.5% | Reduced |
| Sit Investment Associates Inc | 26,202 | $760.0K | 0.01% | 00.0% | Unchanged |
| US Bancorp | 25,600 | $742.4K | 0.00% | −566−2.2% | Reduced |
| Pictet Asset Management Holding SA | 25,252 | $732.3K | 0.00% | +2,062+8.9% | Added |
| Alpine Global Management, LLC | 25,000 | $725.0K | 0.16% | −50,000−66.7% | Reduced |
| Quest Partners LLC | 24,111 | $699.2K | 0.04% | 00.0% | Unchanged |
| Peak Asset Management, LLC | 24,000 | $696.0K | 0.12% | 00.0% | Unchanged |
| Neville Rodie & Shaw Inc | 23,928 | $694.0K | 0.05% | −2,514−9.5% | Reduced |
| Stephens Inc | 22,555 | $654.1K | 0.01% | −3,401−13.1% | Reduced |
| Dover Advisors, LLC | 22,219 | $644.4K | 0.25% | +4,934+28.5% | Added |
| Modera Wealth Management, LLC | 21,945 | $636.4K | 0.01% | −815−3.6% | Reduced |
| Gabelli Funds LLC | 21,388 | $620.3K | 0.00% | −900−4.0% | Reduced |
| Cetera Investment Advisers | 21,274 | $616.9K | 0.00% | −1,935−8.3% | Reduced |
| Deutsche Bank AG | 21,175 | $614.1K | 0.00% | +2,442+13.0% | Added |
| Advisors Asset Management, Inc. | 21,078 | $611.3K | 0.01% | −9,986−32.1% | Reduced |
| Magnetar Financial LLC | 20,875 | $605.4K | 0.01% | +20,875 | New |
| Lathrop Investment Management Corp | 20,314 | $589.0K | 0.11% | −2,503−11.0% | Reduced |
| Qsemble Capital Management, LP | 20,136 | $583.9K | 0.05% | −1,793−8.2% | Reduced |
| Bank of Montreal | 19,409 | $562.9K | 0.00% | −2,205−10.2% | Reduced |
| Old West Investment Management, LLC | 19,355 | $561.3K | 0.10% | +19,355 | New |
| Clifford Swan Investment Counsel LLC | 19,354 | $561.3K | 0.02% | −8,718−31.1% | Reduced |
| Security National Bank of Sioux City Iowa | 19,289 | $559.4K | 0.36% | −42−0.2% | Reduced |
| Carlson Capital L P | 19,000 | $551.0K | 0.27% | −5,000−20.8% | Reduced |
| Wellington Management Group LLP | 18,948 | $549.5K | 0.00% | −740−3.8% | Reduced |
| Legal Advantage Investments, Inc. | 18,900 | $548.1K | 0.25% | +18,900 | New |
| CIBC Asset Management Inc | 18,886 | $547.7K | 0.00% | +4,906+35.1% | Added |
| Neuberger Berman Group LLC | 18,874 | $547.3K | 0.00% | +237+1.3% | Added |