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, Q2 2026
Institutional positions in Amentum Holdings, Inc. as of Jun 30, 2026. 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
- 464
- −15 vs. Q1 2026
- Shares held
- 218.9M
- +7.93M (+3.8%) vs. Q1 2026
- Total value
- $4.34B
- −$931.8M (−17.7%) vs. Q1 2026
- New holders
- 59
- 147 more added
- Sold out
- 74
- 161 more reduced
7 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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, Q2 2026
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Colony Group, LLC | 138,344 | $2.86M | 0.00% | −2,466,567−94.7% | Reduced |
| Vanguard Global Advisers, LLC | 137,394 | $2.84M | 0.00% | +76,006+123.8% | Added |
| Vanguard Asset Management, Ltd | 127,793 | $2.64M | 0.00% | 00.0% | Unchanged |
| Bessemer Group Inc | 126,107 | $2.61M | 0.00% | +155+0.1% | Added |
| JPMorgan Chase & Co | 119,174 | $2.60M | 0.00% | +34,402+40.6% | Added |
| South Dakota Investment Council | 121,837 | $2.52M | 0.04% | −1,200−1.0% | Reduced |
| Soros Fund Management LLCSuperinvestorSoros Fund Management | 118,276 | $2.44M | 0.03% | +10,670+9.9% | Added |
| State Board of Administration of Florida Retirement System | 117,135 | $2.42M | 0.00% | −3,730−3.1% | Reduced |
| Algert Global LLC | 102,220 | $2.11M | 0.03% | +1,210+1.2% | Added |
| Alliancebernstein L.P. | 79,944 | $2.08M | 0.00% | +6,138+8.3% | Added |
| Twinbeech Capital LP | 99,727 | $2.06M | 0.37% | +99,727 | New |
| Strategic Global Advisors, LLC | 99,103 | $2.05M | 0.29% | +3,385+3.5% | Added |
| Quantinno Capital Management LP | 99,067 | $2.05M | 0.00% | −46,507−31.9% | Reduced |
| State of Wisconsin Investment Board | 98,425 | $2.03M | 0.00% | −3,558−3.5% | Reduced |
| Gamco Investors, Inc. Et Al | 97,120 | $2.01M | 0.02% | +1,789+1.9% | Added |
| LPL Financial LLC | 96,430 | $1.99M | 0.00% | +7,630+8.6% | Added |
| Royal Bank of Canada | 92,041 | $1.90M | 0.00% | −139,701−60.3% | Reduced |
| Mraz, Amerine & Associates, Inc. | 90,200 | $1.86M | 0.27% | +18,215+25.3% | Added |
| Pine Valley Investments Ltd Liability Co | 89,488 | $1.85M | 0.08% | +10,213+12.9% | Added |
| Holocene Advisors, LP | 89,037 | $1.84M | 0.00% | −34,160−27.7% | Reduced |
| Illinois Municipal Retirement Fund | 85,809 | $1.77M | 0.02% | +2,402+2.9% | Added |
| Balyasny Asset Management LLC | 85,389 | $1.76M | 0.00% | +67,044+365.5% | Added |
| Wealth Enhancement Advisory Services, LLC | 76,516 | $1.61M | 0.00% | −2,642−3.3% | Reduced |
| Dynamic Technology Lab Private Ltd | 76,540 | $1.58M | 0.35% | +33,295+77.0% | Added |
| Gabelli Funds LLC | 76,283 | $1.58M | 0.01% | +6,500+9.3% | Added |
| Advisor Group Holdings, Inc. | 76,280 | $1.58M | 0.00% | +49,217+181.9% | Added |
| New York State Common Retirement Fund | 75,151 | $1.55M | 0.00% | −427,336−85.0% | Reduced |
| Cascade Investment Advisors, Inc. | 72,340 | $1.50M | 0.82% | +72,340 | New |
| Police & Firemen's Retirement System of New Jersey | 71,268 | $1.47M | 0.01% | +991+1.4% | Added |
| Jupiter Topco LLC | 69,400 | $1.43M | 0.00% | +69,400 | New |
| Ridge Creek Global, Inc | 68,418 | $1.41M | 1.10% | −2,130−3.0% | Reduced |
| Louisiana State Employees Retirement System | 67,500 | $1.40M | 0.02% | −700−1.0% | Reduced |
| Natixis | 67,073 | $1.39M | 0.01% | +67,073 | New |
| Treasurer of the State of North Carolina | 64,959 | $1.34M | 0.00% | −3,200−4.7% | Reduced |
| Caption Management, LLC | 64,000 | $1.32M | 0.05% | +42,278+194.6% | Added |
| State of New Jersey Common Pension Fund D | 61,033 | $1.26M | 0.00% | −9,202−13.1% | Reduced |
| Kerrisdale Advisers, LLC | 59,845 | $1.24M | 0.31% | +30,655+105.0% | Added |
| Winton Group Ltd | 58,393 | $1.21M | 0.04% | +2,893+5.2% | Added |
| Fox Run Management, L.L.C. | 56,706 | $1.17M | 0.19% | +22,767+67.1% | Added |
| Delphi Management Inc | 55,469 | $1.15M | 1.12% | +17,596+46.5% | Added |
| Creative Planning | 54,404 | $1.12M | 0.00% | −10,376−16.0% | Reduced |
| Manufacturers Life Insurance Company, The | 273,618 | $1.12M | 0.00% | +232,701+568.7% | Added |
| Advisors Asset Management, Inc. | 53,517 | $1.11M | 0.02% | +3,489+7.0% | Added |
| State of Tennessee, Treasury Department | 53,132 | $1.10M | 0.00% | +6,870+14.9% | Added |
| Crestwood Advisors Group LLC | 53,002 | $1.10M | 0.02% | −3,815−6.7% | Reduced |
| XTX Topco Ltd | 52,938 | $1.09M | 0.01% | +29,151+122.6% | Added |
| Wolverine Asset Management LLC | 51,942 | $1.07M | 0.01% | 00.0% | Unchanged |
| Victory Capital Management Inc | 50,740 | $1.05M | 0.00% | +915+1.8% | Added |
| State of Alaska, Department of Revenue | 50,689 | $1.05M | 0.01% | −25,172−33.2% | Reduced |
| Hahn Capital Management LLC | 49,705 | $1.03M | 0.62% | −1,415−2.8% | Reduced |
| Envestnet Asset Management Inc | 49,420 | $1.02M | 0.00% | −12,189−19.8% | Reduced |
| Intech Investment Management LLC | 48,767 | $1.01M | 0.01% | +48,767 | New |
| Natixis Advisors, L.P. | 48,328 | $998.0K | 0.00% | −6,078−11.2% | Reduced |
| Wexford Capital LP | 47,870 | $989.5K | 0.14% | +12,384+34.9% | Added |
| Bridgewater Associates, LP | 47,223 | $976.1K | 0.00% | +30,171+176.9% | Added |
| Public Employees Retirement System of Ohio | 45,464 | $939.7K | 0.00% | −2,378−5.0% | Reduced |
| Hikari Tsushin, Inc. | 45,403 | $938.5K | 0.06% | 00.0% | Unchanged |
| Amalgamated Bank | 44,063 | $911.0K | 0.01% | −14,288−24.5% | Reduced |
| Arizona State Retirement System | 43,751 | $904.3K | 0.00% | +210+0.5% | Added |
| First National Advisers, LLC | 43,079 | $890.4K | 0.13% | +30,337+238.1% | Added |
| Cerity Partners LLC | 42,875 | $886.2K | 0.00% | +426+1.0% | Added |
| Paragon Capital Management LLC | 42,651 | $881.6K | 0.41% | −507−1.2% | Reduced |
| Entropy Technologies, LP | 42,286 | $874.1K | 0.03% | +15,391+57.2% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 40,963 | $846.7K | 0.00% | 00.0% | Unchanged |
| Jones Financial Companies LLLP | 41,502 | $840.4K | 0.00% | +3,826+10.2% | Added |
| Lido Advisors, LLC | 40,309 | $833.2K | 0.00% | −10,036−19.9% | Reduced |
| Vanguard Investments Australia, Ltd. | 39,488 | $816.2K | 0.00% | 00.0% | Unchanged |
| Harbor Capital Advisors, Inc. | 39,501 | $816.0K | 0.06% | +39,501 | New |
| Dba Trading, LLC | 31,196 | $813.6K | 0.41% | 00.0% | Unchanged |
| Teachers Retirement System of the State of Kentucky | 37,772 | $781.0K | 0.01% | 00.0% | Unchanged |
| Yousif Capital Management, LLC | 37,746 | $780.2K | 0.01% | −106−0.3% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 36,500 | $754.5K | 0.00% | −1,504−4.0% | Reduced |
| Axq Capital, LP | 35,915 | $742.4K | 0.08% | +35,915 | New |
| Bryn Mawr Trust Co | 35,425 | $732.2K | 0.02% | +6,287+21.6% | Added |
| Oregon Public Employees Retirement Fund | 35,000 | $723.5K | 0.01% | −100−0.3% | Reduced |
| Nisa Investment Advisors, LLC | 34,922 | $721.8K | 0.00% | −1,307−3.6% | Reduced |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 33,813 | $698.9K | 0.00% | −828−2.4% | Reduced |
| Captrust Financial Advisors | 33,730 | $697.2K | 0.00% | +1,801+5.6% | Added |
| Tower Bridge Advisors | 33,261 | $687.5K | 0.06% | −2,437−6.8% | Reduced |
| Lebenthal Global Advisors, LLC | 33,000 | $682.1K | 0.09% | +33,000 | New |
| Old West Investment Management, LLC | 32,875 | $679.5K | 0.07% | +11,108+51.0% | Added |
| Neuberger Berman Group LLC | 32,120 | $663.9K | 0.00% | +11,569+56.3% | Added |
| Clear Harbor Asset Management, LLC | 31,780 | $656.9K | 0.04% | −1,995−5.9% | Reduced |
| Citigroup Inc | 31,486 | $650.8K | 0.00% | −9,185−22.6% | Reduced |
| Marco Investment Management LLC | 31,391 | $648.9K | 0.04% | +31,391 | New |
| Williams Jones Wealth Management, LLC. | 31,209 | $645.1K | 0.01% | −1,306−4.0% | Reduced |
| Dover Advisors, LLC | 22,219 | $644.4K | 0.26% | +1,058+5.0% | Added |
| Blackstone Group Inc. | 31,027 | $641.3K | 0.00% | +31,027 | New |
| Steadtrust LLC | 30,400 | $628.4K | 0.32% | −15,000−33.0% | Reduced |
| Maryland State Retirement & Pension System | 29,838 | $616.8K | 0.01% | 00.0% | Unchanged |
| Legal Advantage Investments, Inc. | 28,900 | $597.4K | 0.21% | 00.0% | Unchanged |
| Group One Trading, L.P. | 27,710 | $572.8K | 0.02% | +27,710 | New |
| CI Private Wealth, LLC | 27,543 | $569.3K | 0.00% | −1,990−6.7% | Reduced |
| Jain Global LLC | 27,519 | $568.8K | 0.01% | +27,519 | New |
| Blair William & Co | 27,278 | $563.8K | 0.00% | −22,020−44.7% | Reduced |
| Pictet Asset Management Holding SA | 26,893 | $555.9K | 0.00% | 00.0% | Unchanged |
| National Philanthropic Trust | 26,844 | $554.9K | 0.01% | −222−0.8% | Reduced |
| Ameritas Advisory Services, LLC | 26,747 | $552.9K | 0.01% | +26,747 | New |
| Sit Investment Associates Inc | 26,202 | $542.0K | 0.01% | 00.0% | Unchanged |
| Security National Bank of So Dak | 25,964 | $536.7K | 0.25% | −165−0.6% | Reduced |