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 |
|---|---|---|---|---|---|
| Advisor Group Holdings, Inc. | 27,063 | $705.8K | 0.00% | −2,063−7.1% | Reduced |
| National Philanthropic Trust | 27,066 | $705.9K | 0.01% | −371−1.4% | Reduced |
| Picton Mahoney Asset Management | 27,235 | $710.3K | 0.01% | +27,227+340,337.5% | Added |
| Oppenheimer Asset Management Inc. | 28,154 | $734.3K | 0.01% | +28,154 | New |
| Walleye Trading LLC | 28,548 | $744.5K | 0.02% | +28,548 | New |
| Legal Advantage Investments, Inc. | 28,900 | $753.7K | 0.39% | +10,000+52.9% | Added |
| Bryn Mawr Trust Co | 29,138 | $759.9K | 0.02% | +2,269+8.4% | Added |
| Kerrisdale Advisers, LLC | 29,190 | $761.3K | 0.29% | +29,190 | New |
| CI Private Wealth, LLC | 29,533 | $768.7K | 0.00% | −7,416−20.1% | Reduced |
| Maryland State Retirement & Pension System | 29,838 | $778.2K | 0.02% | −75−0.3% | Reduced |
| Dba Trading, LLC | 31,196 | $813.6K | 0.40% | 00.0% | Unchanged |
| Captrust Financial Advisors | 31,929 | $832.2K | 0.00% | −60.0% | Reduced |
| Williams Jones Wealth Management, LLC. | 32,515 | $848.0K | 0.01% | −2,977−8.4% | Reduced |
| Fox Run Management, L.L.C. | 33,939 | $854.2K | 0.15% | +26,691+368.3% | Added |
| Clear Harbor Asset Management, LLC | 33,775 | $880.9K | 0.06% | −2,500−6.9% | Reduced |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 34,641 | $903.4K | 0.00% | +1,417+4.3% | Added |
| Oregon Public Employees Retirement Fund | 35,100 | $915.4K | 0.01% | 00.0% | Unchanged |
| Wexford Capital LP | 35,486 | $925.5K | 0.15% | +27,235+330.1% | Added |
| Tower Bridge Advisors | 35,698 | $931.0K | 0.09% | +1,516+4.4% | Added |
| Nisa Investment Advisors, LLC | 36,229 | $944.9K | 0.00% | +473+1.3% | Added |
| Jones Financial Companies LLLP | 37,676 | $973.6K | 0.00% | +1,392+3.8% | Added |
| Teachers Retirement System of the State of Kentucky | 37,772 | $985.0K | 0.01% | 00.0% | Unchanged |
| Yousif Capital Management, LLC | 37,852 | $987.2K | 0.01% | −239−0.6% | Reduced |
| Delphi Management Inc | 37,873 | $988.0K | 1.18% | −11,221−22.9% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 38,004 | $991.1K | 0.01% | +53+0.1% | Added |
| Vanguard Investments Australia, Ltd. | 39,488 | $1.03M | 0.00% | +39,488 | New |
| Landscape Capital Management, L.L.C. | 40,393 | $1.05M | 0.07% | +7,412+22.5% | Added |
| Citigroup Inc | 40,671 | $1.06M | 0.00% | −38,337−48.5% | Reduced |
| Manufacturers Life Insurance Company, The | 40,917 | $1.07M | 0.00% | +3,998+10.8% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 40,963 | $1.07M | 0.00% | +7,525+22.5% | Added |
| Cerity Partners LLC | 42,449 | $1.11M | 0.00% | −9,245−17.9% | Reduced |
| CWM, LLC | 42,637 | $1.11M | 0.00% | −1,977−4.4% | Reduced |
| Paragon Capital Management LLC | 43,158 | $1.13M | 0.56% | −572−1.3% | Reduced |
| Dynamic Technology Lab Private Ltd | 43,245 | $1.13M | 0.19% | +12,382+40.1% | Added |
| Arizona State Retirement System | 43,541 | $1.14M | 0.01% | −319−0.7% | Reduced |
| Steadtrust LLC | 45,400 | $1.18M | 0.67% | −5,000−9.9% | Reduced |
| Hikari Tsushin, Inc. | 45,403 | $1.18M | 0.08% | 00.0% | Unchanged |
| State of Tennessee, Treasury Department | 46,262 | $1.21M | 0.00% | 00.0% | Unchanged |
| Maverick Capital LtdSuperinvestorMaverick Capital | 46,335 | $1.21M | 0.01% | +46,335 | New |
| Barclays PLC | 46,815 | $1.22M | 0.00% | −3,560−7.1% | Reduced |
| Public Employees Retirement System of Ohio | 47,842 | $1.25M | 0.00% | −1,390−2.8% | Reduced |
| Blair William & Co | 49,298 | $1.29M | 0.00% | −30,667−38.4% | Reduced |
| Victory Capital Management Inc | 49,825 | $1.30M | 0.00% | +2,829+6.0% | Added |
| Advisors Asset Management, Inc. | 50,028 | $1.30M | 0.02% | +28,950+137.3% | Added |
| Lido Advisors, LLC | 50,345 | $1.31M | 0.01% | +40,496+411.2% | Added |
| Hahn Capital Management LLC | 51,120 | $1.33M | 0.84% | −10,842−17.5% | Reduced |
| Wolverine Asset Management LLC | 51,942 | $1.35M | 0.02% | −16,098−23.7% | Reduced |
| Mirabella Financial Services LLP | 52,498 | $1.37M | 0.13% | +44,692+572.5% | Added |
| Marex Group plc | 53,043 | $1.38M | 0.01% | +40,041+308.0% | Added |
| Natixis Advisors, L.P. | 54,406 | $1.42M | 0.00% | −3,187−5.5% | Reduced |
| Winton Group Ltd | 55,500 | $1.45M | 0.05% | −45,949−45.3% | Reduced |
| Crestwood Advisors Group LLC | 56,817 | $1.48M | 0.02% | −3,122−5.2% | Reduced |
| Amalgamated Bank | 58,351 | $1.52M | 0.01% | +4,084+7.5% | Added |
| K2 Principal Fund, L.P. | 60,000 | $1.56M | 0.17% | +60,000 | New |
| Vanguard Global Advisers, LLC | 61,388 | $1.60M | 0.00% | +61,388 | New |
| Envestnet Asset Management Inc | 61,609 | $1.61M | 0.00% | −6,088−9.0% | Reduced |
| Creative Planning | 64,780 | $1.69M | 0.00% | +19,946+44.5% | Added |
| D. E. Shaw & Co., Inc. | 66,171 | $1.73M | 0.00% | +66,171 | New |
| Treasurer of the State of North Carolina | 68,159 | $1.78M | 0.01% | +1,452+2.2% | Added |
| Louisiana State Employees Retirement System | 68,200 | $1.78M | 0.03% | −2,000−2.8% | Reduced |
| Janus Henderson Group PLC | 69,400 | $1.81M | 0.00% | 00.0% | Unchanged |
| Gabelli Funds LLC | 69,783 | $1.82M | 0.01% | +48,395+226.3% | Added |
| State of New Jersey Common Pension Fund D | 70,235 | $1.83M | 0.01% | −28,749−29.0% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 70,277 | $1.83M | 0.02% | +3,623+5.4% | Added |
| Ridge Creek Global, Inc | 70,548 | $1.84M | 1.56% | −340−0.5% | Reduced |
| Oak Thistle LLC | 71,759 | $1.87M | 0.18% | +38,803+117.7% | Added |
| Mraz, Amerine & Associates, Inc. | 71,985 | $1.88M | 0.28% | +7,757+12.1% | Added |
| State of Alaska, Department of Revenue | 75,861 | $1.98M | 0.02% | −2,249−2.9% | Reduced |
| Brevan Howard Capital Management LP | 77,196 | $2.01M | 0.02% | +42,178+120.4% | Added |
| Qube Research & Technologies Ltd | 77,369 | $2.02M | 0.00% | −68,813−47.1% | Reduced |
| Pine Valley Investments Ltd Liability Co | 79,275 | $2.07M | 0.10% | +3,381+4.5% | Added |
| Citadel Advisors LLC | 80,638 | $2.10M | 0.00% | +25,053+45.1% | Added |
| CSM Advisors, LLC | 81,241 | $2.12M | 0.05% | −3,518−4.2% | Reduced |
| JPMorgan Chase & Co | 84,772 | $2.13M | 0.00% | −4,519−5.1% | Reduced |
| Alliancebernstein L.P. | 73,806 | $2.14M | 0.00% | +2,533+3.6% | Added |
| Wealth Enhancement Advisory Services, LLC | 79,158 | $2.14M | 0.00% | −76,621−49.2% | Reduced |
| Illinois Municipal Retirement Fund | 83,407 | $2.18M | 0.03% | +83,407 | New |
| Boothbay Fund Management, LLC | 86,192 | $2.25M | 0.05% | +78,978+1,094.8% | Added |
| LPL Financial LLC | 88,800 | $2.32M | 0.00% | +2,122+2.4% | Added |
| Gamco Investors, Inc. Et Al | 95,331 | $2.49M | 0.02% | +3,470+3.8% | Added |
| Strategic Global Advisors, LLC | 95,718 | $2.50M | 0.40% | +95,718 | New |
| Algert Global LLC | 101,010 | $2.63M | 0.04% | −71,523−41.5% | Reduced |
| State of Wisconsin Investment Board | 101,983 | $2.66M | 0.01% | −1,699−1.6% | Reduced |
| Soros Fund Management LLCSuperinvestorSoros Fund Management | 107,606 | $2.81M | 0.04% | −1,697−1.6% | Reduced |
| WSFS Capital Management, LLC | 116,871 | $3.05M | 0.15% | +14,922+14.6% | Added |
| State Board of Administration of Florida Retirement System | 120,865 | $3.15M | 0.01% | 00.0% | Unchanged |
| South Dakota Investment Council | 123,037 | $3.21M | 0.06% | 00.0% | Unchanged |
| Holocene Advisors, LP | 123,197 | $3.21M | 0.01% | +43,876+55.3% | Added |
| Bessemer Group Inc | 125,952 | $3.28M | 0.01% | +124,213+7,142.8% | Added |
| Vanguard Asset Management, Ltd | 127,793 | $3.33M | 0.00% | +127,793 | New |
| Prudential Financial Inc | 140,430 | $3.66M | 0.00% | −1,992−1.4% | Reduced |
| CenterBook Partners LP | 143,698 | $3.75M | 0.20% | −78,525−35.3% | Reduced |
| Price T Rowe Associates Inc | 145,253 | $3.79M | 0.00% | +15,771+12.2% | Added |
| Quantinno Capital Management LP | 145,574 | $3.80M | 0.01% | +67,603+86.7% | Added |
| Wedge Capital Management L L P | 164,666 | $4.29M | 0.08% | +164,666 | New |
| New York State Teachers Retirement System | 165,329 | $4.31M | 0.01% | −728−0.4% | Reduced |
| Oppenheimer & Co Inc | 168,872 | $4.40M | 0.05% | +168,872 | New |
| OpenArc Corporate Advisory, LLC | 170,352 | $4.44M | 0.06% | −29,973−15.0% | Reduced |
| North Growth Management Ltd. | 172,000 | $4.47M | 0.69% | +74,000+75.5% | Added |
| Hel Ved Capital Management Ltd | 178,500 | $4.66M | 0.81% | +178,500 | New |