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 |
|---|---|---|---|---|---|
| American Securities LLC | 45,026,743 | $1.31B | 100.00% | 00.0% | Unchanged |
| Invesco Ltd. | 21,834,003 | $633.2M | 0.06% | −282,832−1.3% | Reduced |
| BlackRock, Inc. | 17,459,099 | $506.3M | 0.01% | −531,350−3.0% | Reduced |
| Vanguard Group Inc | 15,411,745 | $446.9M | 0.01% | −142,946−0.9% | Reduced |
| Primecap Management Co | 12,126,927 | $351.7M | 0.27% | +208,341+1.7% | Added |
| FMR LLC | 6,707,304 | $194.5M | 0.01% | +472,055+7.6% | Added |
| Frontier Capital Management Co LLC | 5,772,976 | $167.4M | 1.78% | +570,296+11.0% | Added |
| State Street Corp | 5,061,620 | $146.8M | 0.00% | −1,771,756−25.9% | Reduced |
| Colony Group, LLC | 2,794,417 | $81.0M | 0.09% | +2,761,801+8,467.6% | Added |
| Geode Capital Management, LLC | 2,659,364 | $77.1M | 0.00% | +5,180+0.2% | Added |
| Ruane, Cunniff & Goldfarb L.P. | 2,394,129 | $69.4M | 1.08% | −29,619−1.2% | Reduced |
| Norges Bank | 2,294,097 | $66.5M | 0.01% | +2,294,097 | New |
| Morgan Stanley | 2,075,352 | $60.2M | 0.00% | +268,935+14.9% | Added |
| Thrivent Financial for Lutherans | 2,069,104 | $60.0M | 0.11% | +263,693+14.6% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 1,961,927 | $56.9M | 0.09% | −119,684−5.7% | Reduced |
| Charles Schwab Investment Management Inc | 1,952,002 | $56.6M | 0.01% | +109,831+6.0% | Added |
| Thompson Siegel & Walmsley LLC | 1,921,809 | $55.7M | 0.94% | −808,489−29.6% | Reduced |
| Dimensional Fund Advisors LP | 1,832,926 | $53.2M | 0.01% | +526,875+40.3% | Added |
| Arvin Capital Management LP | 1,636,492 | $47.5M | 10.22% | 00.0% | Unchanged |
| Cooper Creek Partners Management LLC | 1,553,074 | $45.0M | 2.13% | +1,553,074 | New |
| AQR Capital Management LLC | 1,452,049 | $42.1M | 0.02% | +1,286,844+778.9% | Added |
| FIL Ltd | 1,429,384 | $41.5M | 0.03% | −129,640−8.3% | Reduced |
| Brightline Capital Management, LLC | 1,392,000 | $40.4M | 16.32% | +192,000+16.0% | Added |
| ExodusPoint Capital Management, LP | 1,184,186 | $34.3M | 0.38% | +1,077,998+1,015.2% | Added |
| Bank of America Corp | 1,157,427 | $33.6M | 0.00% | +358,990+45.0% | Added |
| Voya Investment Management LLC | 1,147,477 | $33.3M | 0.03% | +62,508+5.8% | Added |
| Loomis Sayles & Co L P | 1,118,930 | $32.4M | 0.04% | +54,851+5.2% | Added |
| Northern Trust Corp | 952,977 | $27.6M | 0.00% | +10,032+1.1% | Added |
| Bank of New York Mellon Corp | 922,097 | $26.7M | 0.00% | +55,834+6.4% | Added |
| Cacti Asset Management LLC | 881,692 | $25.7M | 1.59% | +24,600+2.9% | Added |
| Verition Fund Management LLC | 865,172 | $25.1M | 0.14% | −270,454−23.8% | Reduced |
| Avenir Corp | 850,944 | $24.7M | 2.68% | −11,509−1.3% | Reduced |
| 683 Capital Management, LLC | 835,000 | $24.2M | 2.01% | −440,000−34.5% | Reduced |
| Nuveen, LLC | 813,774 | $23.6M | 0.01% | +62,470+8.3% | Added |
| Penn Capital Management Co Inc | 743,937 | $21.6M | 1.72% | −216,670−22.6% | Reduced |
| Principal Financial Group Inc | 728,414 | $21.1M | 0.01% | −7,341−1.0% | Reduced |
| Point72 Asset Management, L.P. | 695,287 | $20.2M | 0.03% | −685,705−49.7% | Reduced |
| Goldman Sachs Group Inc | 644,158 | $18.7M | 0.00% | −167,773−20.7% | Reduced |
| Two Sigma Investments, LP | 637,986 | $18.5M | 0.03% | +238,863+59.8% | Added |
| Gotham Asset Management, LLC | 635,430 | $18.4M | 0.07% | +390,604+159.5% | Added |
| Segra Capital Management, LLC | 604,810 | $17.5M | 37.63% | +187,785+45.0% | Added |
| New York State Common Retirement Fund | 535,218 | $15.5M | 0.02% | −123,862−18.8% | Reduced |
| Van Eck Associates Corp | 531,007 | $15.4M | 0.01% | −234,670−30.6% | Reduced |
| Public Sector Pension Investment Board | 530,566 | $15.4M | 0.05% | −67,410−11.3% | Reduced |
| Royce & Associates LP | 495,286 | $14.4M | 0.15% | +40,786+9.0% | Added |
| Hyperion Capital Advisors LP | 491,872 | $14.3M | 6.98% | +71,864+17.1% | Added |
| Moore Capital Management, LP | 475,314 | $13.8M | 0.28% | +67,897+16.7% | Added |
| Wells Fargo & Company | 464,739 | $13.5M | 0.00% | +421,305+970.0% | Added |
| Russell Investments Group, Ltd. | 437,016 | $12.7M | 0.01% | +147,467+50.9% | Added |
| Ci Investments Inc. | 425,528 | $12.3M | 0.05% | −2,743−0.6% | Reduced |
| Ancora Advisors, LLC | 402,346 | $11.7M | 0.24% | +268,472+200.5% | Added |
| Vident Advisory, LLC | 382,540 | $11.1M | 0.10% | −72,164−15.9% | Reduced |
| First Trust Advisors LP | 377,828 | $11.0M | 0.01% | +339,238+879.1% | Added |
| Legal & General Group Plc | 368,605 | $10.7M | 0.00% | −19,684−5.1% | Reduced |
| Aristotle Capital Boston, LLC | 358,867 | $10.4M | 0.57% | −50,276−12.3% | Reduced |
| SG Americas Securities, LLC | 345,341 | $10.0M | 0.01% | +316,277+1,088.2% | Added |
| Ameriprise Financial Inc | 338,599 | $9.82M | 0.00% | −17,347−4.9% | Reduced |
| Legacy Advisors, LLC | 9,814,289 | $9.81M | 1.05% | +9,814,289 | New |
| Swiss National Bank | 311,791 | $9.04M | 0.01% | +5,300+1.7% | Added |
| Exchange Traded Concepts, LLC | 310,521 | $9.01M | 0.08% | +43,027+16.1% | Added |
| Comerica Bank | 301,564 | $8.75M | 0.03% | −11,075−3.5% | Reduced |
| Rhumbline Advisers | 291,441 | $8.45M | 0.01% | +1,623+0.6% | Added |
| Grizzlyrock Capital, LLC | 285,113 | $8.27M | 6.19% | +2,000+0.7% | Added |
| California Public Employees Retirement System | 278,644 | $8.08M | 0.00% | +46,635+20.1% | Added |
| Hotchkis & Wiley Capital Management LLC | 268,375 | $7.78M | 0.02% | +245+0.1% | Added |
| Balyasny Asset Management LLC | 267,999 | $7.77M | 0.01% | +231,989+644.2% | Added |
| Royal Bank of Canada | 266,543 | $7.73M | 0.00% | +24,487+10.1% | Added |
| UBS Asset Management Americas Inc | 253,016 | $7.34M | 0.00% | −24,881−9.0% | Reduced |
| AWH Capital, L.P. | 235,250 | $6.82M | 6.29% | 00.0% | Unchanged |
| CenterBook Partners LP | 222,223 | $6.44M | 0.31% | −85,858−27.9% | Reduced |
| Susquehanna Fundamental Investments, LLC | 219,931 | $6.38M | 0.22% | +165,594+304.8% | Added |
| SEI Investments Co | 217,044 | $6.29M | 0.01% | +16,521+8.2% | Added |
| UBS Group AG | 206,102 | $5.98M | 0.00% | −25,088−10.9% | Reduced |
| OpenArc Corporate Advisory, LLC | 200,325 | $5.81M | 0.10% | +200,325 | New |
| Hudson Value Partners, LLC | 187,993 | $5.50M | 1.64% | +2,168+1.2% | Added |
| Telos Capital Management, Inc. | 187,466 | $5.44M | 0.51% | −2,393−1.3% | Reduced |
| First National Bank of Omaha | 177,700 | $5.21M | 0.15% | +177,700 | New |
| Soviero Asset Management, LP | 178,000 | $5.16M | 2.70% | +23,000+14.8% | Added |
| Algert Global LLC | 172,533 | $5.00M | 0.08% | −49,077−22.1% | Reduced |
| Wealth Enhancement Advisory Services, LLC | 155,779 | $4.91M | 0.01% | +5,434+3.6% | Added |
| Raymond James Financial Inc | 168,045 | $4.87M | 0.00% | +28,642+20.5% | Added |
| New York State Teachers Retirement System | 166,057 | $4.82M | 0.01% | +25,139+17.8% | Added |
| Two Sigma Advisers, LP | 157,077 | $4.56M | 0.01% | −2,091−1.3% | Reduced |
| California State Teachers Retirement System | 149,912 | $4.35M | 0.00% | −12,418−7.6% | Reduced |
| Qube Research & Technologies Ltd | 146,182 | $4.24M | 0.01% | +146,182 | New |
| Prudential Financial Inc | 142,422 | $4.13M | 0.00% | −4,776−3.2% | Reduced |
| Twinbeech Capital LP | 137,453 | $3.99M | 0.28% | −85,254−38.3% | Reduced |
| Price T Rowe Associates Inc | 129,482 | $3.76M | 0.00% | +11,307+9.6% | Added |
| South Dakota Investment Council | 123,037 | $3.57M | 0.07% | +58,617+91.0% | Added |
| State Board of Administration of Florida Retirement System | 120,865 | $3.51M | 0.01% | 00.0% | Unchanged |
| Caption Management, LLC | 116,500 | $3.38M | 0.15% | +75,400+183.5% | Added |
| Soros Fund Management LLCSuperinvestorSoros Fund Management | 109,303 | $3.17M | 0.04% | +109,303 | New |
| State of Wisconsin Investment Board | 103,682 | $3.01M | 0.01% | +12,284+13.4% | Added |
| WSFS Capital Management, LLC | 101,949 | $2.96M | 0.14% | +22,306+28.0% | Added |
| Winton Group Ltd | 101,449 | $2.94M | 0.10% | +48,040+89.9% | Added |
| Blackstone Group Inc. | 99,643 | $2.89M | 0.01% | +50,537+102.9% | Added |
| State of New Jersey Common Pension Fund D | 98,984 | $2.87M | 0.01% | +11,342+12.9% | Added |
| North Growth Management Ltd. | 98,000 | $2.83M | 0.44% | +1,000+1.0% | Added |
| Gamco Investors, Inc. Et Al | 91,861 | $2.66M | 0.03% | −7,782−7.8% | Reduced |
| JPMorgan Chase & Co | 89,291 | $2.59M | 0.00% | −15,480−14.8% | Reduced |