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, Q1 2026
Institutional positions in Amentum Holdings, Inc. as of Mar 31, 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
- 486
- +10 vs. Q4 2025
- Shares held
- 211.1M
- +25.3M (+13.6%) vs. Q4 2025
- Total value
- $5.28B
- +$162.1M (+3.2%) vs. Q4 2025
- New holders
- 70
- 151 more added
- Sold out
- 60
- 152 more reduced
7 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| State Board of Administration of Florida Retirement System | 120,865 | $3.15M | 0.01% | 00.0% | Unchanged |
| WSFS Capital Management, LLC | 116,871 | $3.05M | 0.15% | +14,922+14.6% | Added |
| Soros Fund Management LLCSuperinvestorSoros Fund Management | 107,606 | $2.81M | 0.04% | −1,697−1.6% | Reduced |
| State of Wisconsin Investment Board | 101,983 | $2.66M | 0.01% | −1,699−1.6% | Reduced |
| Algert Global LLC | 101,010 | $2.63M | 0.04% | −71,523−41.5% | Reduced |
| Strategic Global Advisors, LLC | 95,718 | $2.50M | 0.40% | +95,718 | New |
| Gamco Investors, Inc. Et Al | 95,331 | $2.49M | 0.02% | +3,470+3.8% | Added |
| LPL Financial LLC | 88,800 | $2.32M | 0.00% | +2,122+2.4% | Added |
| Boothbay Fund Management, LLC | 86,192 | $2.25M | 0.05% | +78,978+1,094.8% | Added |
| Illinois Municipal Retirement Fund | 83,407 | $2.18M | 0.03% | +83,407 | New |
| Wealth Enhancement Advisory Services, LLC | 79,158 | $2.14M | 0.00% | −76,621−49.2% | Reduced |
| Alliancebernstein L.P. | 73,806 | $2.14M | 0.00% | +2,533+3.6% | Added |
| JPMorgan Chase & Co | 84,772 | $2.13M | 0.00% | −4,519−5.1% | Reduced |
| CSM Advisors, LLC | 81,241 | $2.12M | 0.05% | −3,518−4.2% | Reduced |
| Citadel Advisors LLC | 80,638 | $2.10M | 0.00% | +25,053+45.1% | Added |
| Pine Valley Investments Ltd Liability Co | 79,275 | $2.07M | 0.10% | +3,381+4.5% | Added |
| Qube Research & Technologies Ltd | 77,369 | $2.02M | 0.00% | −68,813−47.1% | Reduced |
| Brevan Howard Capital Management LP | 77,196 | $2.01M | 0.02% | +42,178+120.4% | Added |
| State of Alaska, Department of Revenue | 75,861 | $1.98M | 0.02% | −2,249−2.9% | Reduced |
| Mraz, Amerine & Associates, Inc. | 71,985 | $1.88M | 0.28% | +7,757+12.1% | Added |
| Oak Thistle LLC | 71,759 | $1.87M | 0.18% | +38,803+117.7% | Added |
| Ridge Creek Global, Inc | 70,548 | $1.84M | 1.56% | −340−0.5% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 70,277 | $1.83M | 0.02% | +3,623+5.4% | Added |
| State of New Jersey Common Pension Fund D | 70,235 | $1.83M | 0.01% | −28,749−29.0% | Reduced |
| Gabelli Funds LLC | 69,783 | $1.82M | 0.01% | +48,395+226.3% | Added |
| Janus Henderson Group PLC | 69,400 | $1.81M | 0.00% | 00.0% | Unchanged |
| Louisiana State Employees Retirement System | 68,200 | $1.78M | 0.03% | −2,000−2.8% | Reduced |
| Treasurer of the State of North Carolina | 68,159 | $1.78M | 0.01% | +1,452+2.2% | Added |
| D. E. Shaw & Co., Inc. | 66,171 | $1.73M | 0.00% | +66,171 | New |
| Creative Planning | 64,780 | $1.69M | 0.00% | +19,946+44.5% | Added |
| Envestnet Asset Management Inc | 61,609 | $1.61M | 0.00% | −6,088−9.0% | Reduced |
| Vanguard Global Advisers, LLC | 61,388 | $1.60M | 0.00% | +61,388 | New |
| K2 Principal Fund, L.P. | 60,000 | $1.56M | 0.17% | +60,000 | New |
| Amalgamated Bank | 58,351 | $1.52M | 0.01% | +4,084+7.5% | Added |
| Crestwood Advisors Group LLC | 56,817 | $1.48M | 0.02% | −3,122−5.2% | Reduced |
| Winton Group Ltd | 55,500 | $1.45M | 0.05% | −45,949−45.3% | Reduced |
| Natixis Advisors, L.P. | 54,406 | $1.42M | 0.00% | −3,187−5.5% | Reduced |
| Marex Group plc | 53,043 | $1.38M | 0.01% | +40,041+308.0% | Added |
| Mirabella Financial Services LLP | 52,498 | $1.37M | 0.13% | +44,692+572.5% | Added |
| Wolverine Asset Management LLC | 51,942 | $1.35M | 0.02% | −16,098−23.7% | Reduced |
| Hahn Capital Management LLC | 51,120 | $1.33M | 0.84% | −10,842−17.5% | Reduced |
| Lido Advisors, LLC | 50,345 | $1.31M | 0.01% | +40,496+411.2% | Added |
| Advisors Asset Management, Inc. | 50,028 | $1.30M | 0.02% | +28,950+137.3% | Added |
| Victory Capital Management Inc | 49,825 | $1.30M | 0.00% | +2,829+6.0% | Added |
| Blair William & Co | 49,298 | $1.29M | 0.00% | −30,667−38.4% | Reduced |
| Public Employees Retirement System of Ohio | 47,842 | $1.25M | 0.00% | −1,390−2.8% | Reduced |
| Barclays PLC | 46,815 | $1.22M | 0.00% | −3,560−7.1% | Reduced |
| Maverick Capital LtdSuperinvestorMaverick Capital | 46,335 | $1.21M | 0.01% | +46,335 | New |
| State of Tennessee, Treasury Department | 46,262 | $1.21M | 0.00% | 00.0% | Unchanged |
| Hikari Tsushin, Inc. | 45,403 | $1.18M | 0.08% | 00.0% | Unchanged |
| Steadtrust LLC | 45,400 | $1.18M | 0.67% | −5,000−9.9% | Reduced |
| Arizona State Retirement System | 43,541 | $1.14M | 0.01% | −319−0.7% | Reduced |
| Dynamic Technology Lab Private Ltd | 43,245 | $1.13M | 0.19% | +12,382+40.1% | Added |
| Paragon Capital Management LLC | 43,158 | $1.13M | 0.56% | −572−1.3% | Reduced |
| CWM, LLC | 42,637 | $1.11M | 0.00% | −1,977−4.4% | Reduced |
| Cerity Partners LLC | 42,449 | $1.11M | 0.00% | −9,245−17.9% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 40,963 | $1.07M | 0.00% | +7,525+22.5% | Added |
| Manufacturers Life Insurance Company, The | 40,917 | $1.07M | 0.00% | +3,998+10.8% | Added |
| Citigroup Inc | 40,671 | $1.06M | 0.00% | −38,337−48.5% | Reduced |
| Landscape Capital Management, L.L.C. | 40,393 | $1.05M | 0.07% | +7,412+22.5% | Added |
| Vanguard Investments Australia, Ltd. | 39,488 | $1.03M | 0.00% | +39,488 | New |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 38,004 | $991.1K | 0.01% | +53+0.1% | Added |
| Delphi Management Inc | 37,873 | $988.0K | 1.18% | −11,221−22.9% | Reduced |
| Yousif Capital Management, LLC | 37,852 | $987.2K | 0.01% | −239−0.6% | Reduced |
| Teachers Retirement System of the State of Kentucky | 37,772 | $985.0K | 0.01% | 00.0% | Unchanged |
| Jones Financial Companies LLLP | 37,676 | $973.6K | 0.00% | +1,392+3.8% | Added |
| Nisa Investment Advisors, LLC | 36,229 | $944.9K | 0.00% | +473+1.3% | Added |
| Tower Bridge Advisors | 35,698 | $931.0K | 0.09% | +1,516+4.4% | Added |
| Wexford Capital LP | 35,486 | $925.5K | 0.15% | +27,235+330.1% | Added |
| Oregon Public Employees Retirement Fund | 35,100 | $915.4K | 0.01% | 00.0% | Unchanged |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 34,641 | $903.4K | 0.00% | +1,417+4.3% | Added |
| Clear Harbor Asset Management, LLC | 33,775 | $880.9K | 0.06% | −2,500−6.9% | Reduced |
| Fox Run Management, L.L.C. | 33,939 | $854.2K | 0.15% | +26,691+368.3% | Added |
| Williams Jones Wealth Management, LLC. | 32,515 | $848.0K | 0.01% | −2,977−8.4% | Reduced |
| Captrust Financial Advisors | 31,929 | $832.2K | 0.00% | −60.0% | Reduced |
| Dba Trading, LLC | 31,196 | $813.6K | 0.40% | 00.0% | Unchanged |
| Maryland State Retirement & Pension System | 29,838 | $778.2K | 0.02% | −75−0.3% | Reduced |
| CI Private Wealth, LLC | 29,533 | $768.7K | 0.00% | −7,416−20.1% | Reduced |
| Kerrisdale Advisers, LLC | 29,190 | $761.3K | 0.29% | +29,190 | New |
| Bryn Mawr Trust Co | 29,138 | $759.9K | 0.02% | +2,269+8.4% | Added |
| Legal Advantage Investments, Inc. | 28,900 | $753.7K | 0.39% | +10,000+52.9% | Added |
| Walleye Trading LLC | 28,548 | $744.5K | 0.02% | +28,548 | New |
| Oppenheimer Asset Management Inc. | 28,154 | $734.3K | 0.01% | +28,154 | New |
| Picton Mahoney Asset Management | 27,235 | $710.3K | 0.01% | +27,227+340,337.5% | Added |
| National Philanthropic Trust | 27,066 | $705.9K | 0.01% | −371−1.4% | Reduced |
| Advisor Group Holdings, Inc. | 27,063 | $705.8K | 0.00% | −2,063−7.1% | Reduced |
| Entropy Technologies, LP | 26,895 | $701.4K | 0.03% | +26,895 | New |
| Pictet Asset Management Holding SA | 26,893 | $701.4K | 0.00% | +1,641+6.5% | Added |
| Sit Investment Associates Inc | 26,202 | $683.0K | 0.01% | 00.0% | Unchanged |
| Security National Bank of So Dak | 26,129 | $681.4K | 0.33% | −513−1.9% | Reduced |
| Cetera Investment Advisers | 24,375 | $635.7K | 0.00% | +3,101+14.6% | Added |
| US Bancorp | 24,277 | $633.1K | 0.00% | −1,323−5.2% | Reduced |
| Peak Asset Management, LLC | 24,000 | $625.9K | 0.11% | 00.0% | Unchanged |
| XTX Topco Ltd | 23,787 | $620.4K | 0.01% | −21,034−46.9% | Reduced |
| Stephens Inc | 23,395 | $610.1K | 0.01% | +840+3.7% | Added |
| Atom Investors LP | 22,815 | $595.0K | 0.04% | −20,922−47.8% | Reduced |
| Toth Financial Advisory Corp | 22,355 | $583.0K | 0.06% | +6,665+42.5% | Added |
| Stifel Financial Corp | 21,935 | $572.1K | 0.00% | −8,615−28.2% | Reduced |
| Neville Rodie & Shaw Inc | 21,810 | $569.0K | 0.04% | −2,118−8.9% | Reduced |
| Pathstone Holdings, LLC | 21,794 | $568.4K | 0.00% | −10,132−31.7% | Reduced |