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 $4.35B 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 | $4.35B |
| Q1 2026 | 486 | $5.28B |
| Q4 2025 | 483 | $5.64B |
| Q3 2025 | 462 | $4.63B |
| Q2 2025 | 461 | $4.74B |
| Q1 2025 | 418 | $3.50B |
| Q4 2024 | 451 | $3.50B |
| Q3 2024 | 492 | $3.25B |
| 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 |
|---|---|---|---|---|---|
| Entropy Technologies, LP | 42,286 | $874.1K | 0.03% | +15,391+57.2% | Added |
| Paragon Capital Management LLC | 42,651 | $881.6K | 0.41% | −507−1.2% | Reduced |
| Cerity Partners LLC | 42,875 | $886.2K | 0.00% | +426+1.0% | Added |
| First National Advisers, LLC | 43,079 | $890.4K | 0.13% | +30,337+238.1% | Added |
| Arizona State Retirement System | 43,751 | $904.3K | 0.00% | +210+0.5% | Added |
| Amalgamated Bank | 44,063 | $911.0K | 0.01% | −14,288−24.5% | Reduced |
| Hikari Tsushin, Inc. | 45,403 | $938.5K | 0.06% | 00.0% | Unchanged |
| Public Employees Retirement System of Ohio | 45,464 | $939.7K | 0.00% | −2,378−5.0% | Reduced |
| Bridgewater Associates, LP | 47,223 | $976.1K | 0.00% | +30,171+176.9% | Added |
| Wexford Capital LP | 47,870 | $989.5K | 0.14% | +12,384+34.9% | Added |
| Natixis Advisors, L.P. | 48,328 | $998.0K | 0.00% | −6,078−11.2% | Reduced |
| Intech Investment Management LLC | 48,767 | $1.01M | 0.01% | +48,767 | New |
| Envestnet Asset Management Inc | 49,420 | $1.02M | 0.00% | −12,189−19.8% | Reduced |
| Hahn Capital Management LLC | 49,705 | $1.03M | 0.62% | −1,415−2.8% | Reduced |
| State of Alaska, Department of Revenue | 50,689 | $1.05M | 0.01% | −25,172−33.2% | Reduced |
| Victory Capital Management Inc | 50,740 | $1.05M | 0.00% | +915+1.8% | Added |
| Wolverine Asset Management LLC | 51,942 | $1.07M | 0.01% | 00.0% | Unchanged |
| XTX Topco Ltd | 52,938 | $1.09M | 0.01% | +29,151+122.6% | Added |
| Crestwood Advisors Group LLC | 53,002 | $1.10M | 0.02% | −3,815−6.7% | Reduced |
| State of Tennessee, Treasury Department | 53,132 | $1.10M | 0.00% | +6,870+14.9% | Added |
| Advisors Asset Management, Inc. | 53,517 | $1.11M | 0.02% | +3,489+7.0% | Added |
| Manufacturers Life Insurance Company, The | 273,618 | $1.12M | 0.00% | +232,701+568.7% | Added |
| Creative Planning | 54,404 | $1.12M | 0.00% | −10,376−16.0% | Reduced |
| Delphi Management Inc | 55,469 | $1.15M | 1.12% | +17,596+46.5% | Added |
| Fox Run Management, L.L.C. | 56,706 | $1.17M | 0.19% | +22,767+67.1% | Added |
| Winton Group Ltd | 58,393 | $1.21M | 0.04% | +2,893+5.2% | Added |
| Kerrisdale Advisers, LLC | 59,845 | $1.24M | 0.31% | +30,655+105.0% | Added |
| State of New Jersey Common Pension Fund D | 61,033 | $1.26M | 0.00% | −9,202−13.1% | Reduced |
| Caption Management, LLC | 64,000 | $1.32M | 0.05% | +42,278+194.6% | Added |
| Treasurer of the State of North Carolina | 64,959 | $1.34M | 0.00% | −3,200−4.7% | Reduced |
| Natixis | 67,073 | $1.39M | 0.01% | +67,073 | New |
| Louisiana State Employees Retirement System | 67,500 | $1.40M | 0.02% | −700−1.0% | Reduced |
| Ridge Creek Global, Inc | 68,418 | $1.41M | 1.10% | −2,130−3.0% | Reduced |
| Jupiter Topco LLC | 69,400 | $1.43M | 0.00% | +69,400 | New |
| Police & Firemen's Retirement System of New Jersey | 71,268 | $1.47M | 0.01% | +991+1.4% | Added |
| Cascade Investment Advisors, Inc. | 72,340 | $1.50M | 0.82% | +72,340 | New |
| New York State Common Retirement Fund | 75,151 | $1.55M | 0.00% | −427,336−85.0% | Reduced |
| Advisor Group Holdings, Inc. | 76,280 | $1.58M | 0.00% | +49,217+181.9% | Added |
| Gabelli Funds LLC | 76,283 | $1.58M | 0.01% | +6,500+9.3% | Added |
| Dynamic Technology Lab Private Ltd | 76,540 | $1.58M | 0.35% | +33,295+77.0% | Added |
| Wealth Enhancement Advisory Services, LLC | 76,516 | $1.61M | 0.00% | −2,642−3.3% | Reduced |
| Balyasny Asset Management LLC | 85,389 | $1.76M | 0.00% | +67,044+365.5% | Added |
| Illinois Municipal Retirement Fund | 85,809 | $1.77M | 0.02% | +2,402+2.9% | Added |
| Holocene Advisors, LP | 89,037 | $1.84M | 0.00% | −34,160−27.7% | Reduced |
| Pine Valley Investments Ltd Liability Co | 89,488 | $1.85M | 0.08% | +10,213+12.9% | Added |
| Mraz, Amerine & Associates, Inc. | 90,200 | $1.86M | 0.27% | +18,215+25.3% | Added |
| Royal Bank of Canada | 92,041 | $1.90M | 0.00% | −139,701−60.3% | Reduced |
| LPL Financial LLC | 96,430 | $1.99M | 0.00% | +7,630+8.6% | Added |
| Gamco Investors, Inc. Et Al | 97,120 | $2.01M | 0.02% | +1,789+1.9% | Added |
| State of Wisconsin Investment Board | 98,425 | $2.03M | 0.00% | −3,558−3.5% | Reduced |
| Quantinno Capital Management LP | 99,067 | $2.05M | 0.00% | −46,507−31.9% | Reduced |
| Strategic Global Advisors, LLC | 99,103 | $2.05M | 0.29% | +3,385+3.5% | Added |
| Twinbeech Capital LP | 99,727 | $2.06M | 0.37% | +99,727 | New |
| Alliancebernstein L.P. | 79,944 | $2.08M | 0.00% | +6,138+8.3% | Added |
| Algert Global LLC | 102,220 | $2.11M | 0.03% | +1,210+1.2% | Added |
| State Board of Administration of Florida Retirement System | 117,135 | $2.42M | 0.00% | −3,730−3.1% | Reduced |
| Soros Fund Management LLCSuperinvestorSoros Fund Management | 118,276 | $2.44M | 0.03% | +10,670+9.9% | Added |
| South Dakota Investment Council | 121,837 | $2.52M | 0.04% | −1,200−1.0% | Reduced |
| JPMorgan Chase & Co | 119,174 | $2.60M | 0.00% | +34,402+40.6% | Added |
| Bessemer Group Inc | 126,107 | $2.61M | 0.00% | +155+0.1% | Added |
| Vanguard Asset Management, Ltd | 127,793 | $2.64M | 0.00% | 00.0% | Unchanged |
| Vanguard Global Advisers, LLC | 137,394 | $2.84M | 0.00% | +76,006+123.8% | Added |
| Colony Group, LLC | 138,344 | $2.86M | 0.00% | −2,466,567−94.7% | Reduced |
| Prudential Financial Inc | 139,950 | $2.89M | 0.00% | −480−0.3% | Reduced |
| WSFS Capital Management, LLC | 141,443 | $2.92M | 0.13% | +24,572+21.0% | Added |
| Oppenheimer & Co Inc | 142,974 | $2.96M | 0.03% | −25,898−15.3% | Reduced |
| Soviero Asset Management, LP | 150,000 | $3.10M | 1.50% | −90,000−37.5% | Reduced |
| Barclays PLC | 151,780 | $3.14M | 0.00% | +104,965+224.2% | Added |
| Price T Rowe Associates Inc | 152,081 | $3.15M | 0.00% | +6,828+4.7% | Added |
| Gotham Asset Management, LLC | 156,113 | $3.23M | 0.01% | −364,928−70.0% | Reduced |
| Atom Investors LP | 160,876 | $3.33M | 0.30% | +138,061+605.1% | Added |
| New York State Teachers Retirement System | 161,992 | $3.35M | 0.01% | −3,337−2.0% | Reduced |
| Brevan Howard Capital Management LP | 167,354 | $3.46M | 0.05% | +90,158+116.8% | Added |
| OpenArc Corporate Advisory, LLC | 170,291 | $3.52M | 0.04% | −610.0% | Reduced |
| North Growth Management Ltd. | 173,000 | $3.57M | 0.46% | +1,000+0.6% | Added |
| California State Teachers Retirement System | 183,223 | $3.79M | 0.00% | −1,332−0.7% | Reduced |
| Telos Capital Management, Inc. | 185,611 | $3.84M | 0.34% | −4,290−2.3% | Reduced |
| Verbena Value LP | 186,200 | $3.85M | 0.64% | +186,200 | New |
| Wedge Capital Management L L P | 187,832 | $3.88M | 0.06% | +23,166+14.1% | Added |
| SEI Investments Co | 190,069 | $3.93M | 0.00% | −104,599−35.5% | Reduced |
| D. E. Shaw & Co., Inc. | 191,488 | $3.96M | 0.00% | +125,317+189.4% | Added |
| Hel Ved Capital Management Ltd | 214,000 | $4.42M | 0.62% | +35,500+19.9% | Added |
| Raymond James Financial Inc | 224,399 | $4.64M | 0.00% | −21,425−8.7% | Reduced |
| ExodusPoint Capital Management, LP | 226,289 | $4.68M | 0.04% | +226,289 | New |
| AWH Capital, L.P. | 235,250 | $4.86M | 3.34% | 00.0% | Unchanged |
| CSM Advisors, LLC | 243,814 | $5.04M | 0.11% | +162,573+200.1% | Added |
| UBS Asset Management Americas Inc | 249,725 | $5.16M | 0.00% | +1,768+0.7% | Added |
| Hudson Value Partners, LLC | 250,185 | $5.17M | 1.30% | +46,275+22.7% | Added |
| SG Americas Securities, LLC | 262,993 | $5.44M | 0.00% | −11,609−4.2% | Reduced |
| California Public Employees Retirement System | 266,383 | $5.51M | 0.00% | −10,669−3.9% | Reduced |
| Fifth Third Bancorp | 281,815 | $5.83M | 0.01% | +8,499+3.1% | Added |
| Rhumbline Advisers | 284,060 | $5.87M | 0.00% | −16,233−5.4% | Reduced |
| Two Sigma Investments, LP | 284,268 | $5.88M | 0.00% | −615,909−68.4% | Reduced |
| Exchange Traded Concepts, LLC | 305,286 | $6.31M | 0.03% | +10,278+3.5% | Added |
| Aristotle Capital Boston, LLC | 307,836 | $6.36M | 0.43% | −37,140−10.8% | Reduced |
| Rovida Investment Management Ltd | 315,000 | $6.50M | 0.44% | 00.0% | Unchanged |
| Swiss National Bank | 318,091 | $6.57M | 0.00% | +4,700+1.5% | Added |
| Grizzlyrock Capital, LLC | 318,363 | $6.58M | 4.60% | +29,250+10.1% | Added |
| Ameriprise Financial Inc | 319,479 | $6.60M | 0.00% | −10,266−3.1% | Reduced |
| CenterBook Partners LP | 328,766 | $6.80M | 0.33% | +185,068+128.8% | Added |