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 |
|---|---|---|---|---|---|
| Two Sigma Advisers, LP | 157,077 | $4.56M | 0.01% | −2,091−1.3% | Reduced |
| New York State Teachers Retirement System | 166,057 | $4.82M | 0.01% | +25,139+17.8% | Added |
| Raymond James Financial Inc | 168,045 | $4.87M | 0.00% | +28,642+20.5% | Added |
| Wealth Enhancement Advisory Services, LLC | 155,779 | $4.91M | 0.01% | +5,434+3.6% | Added |
| Algert Global LLC | 172,533 | $5.00M | 0.08% | −49,077−22.1% | Reduced |
| Soviero Asset Management, LP | 178,000 | $5.16M | 2.70% | +23,000+14.8% | Added |
| First National Bank of Omaha | 177,700 | $5.21M | 0.15% | +177,700 | New |
| Telos Capital Management, Inc. | 187,466 | $5.44M | 0.51% | −2,393−1.3% | Reduced |
| Hudson Value Partners, LLC | 187,993 | $5.50M | 1.64% | +2,168+1.2% | Added |
| OpenArc Corporate Advisory, LLC | 200,325 | $5.81M | 0.10% | +200,325 | New |
| UBS Group AG | 206,102 | $5.98M | 0.00% | −25,088−10.9% | Reduced |
| SEI Investments Co | 217,044 | $6.29M | 0.01% | +16,521+8.2% | Added |
| Susquehanna Fundamental Investments, LLC | 219,931 | $6.38M | 0.22% | +165,594+304.8% | Added |
| CenterBook Partners LP | 222,223 | $6.44M | 0.31% | −85,858−27.9% | Reduced |
| AWH Capital, L.P. | 235,250 | $6.82M | 6.29% | 00.0% | Unchanged |
| UBS Asset Management Americas Inc | 253,016 | $7.34M | 0.00% | −24,881−9.0% | Reduced |
| Royal Bank of Canada | 266,543 | $7.73M | 0.00% | +24,487+10.1% | Added |
| Balyasny Asset Management LLC | 267,999 | $7.77M | 0.01% | +231,989+644.2% | Added |
| Hotchkis & Wiley Capital Management LLC | 268,375 | $7.78M | 0.02% | +245+0.1% | Added |
| California Public Employees Retirement System | 278,644 | $8.08M | 0.00% | +46,635+20.1% | Added |
| Grizzlyrock Capital, LLC | 285,113 | $8.27M | 6.19% | +2,000+0.7% | Added |
| Rhumbline Advisers | 291,441 | $8.45M | 0.01% | +1,623+0.6% | Added |
| Comerica Bank | 301,564 | $8.75M | 0.03% | −11,075−3.5% | Reduced |
| Exchange Traded Concepts, LLC | 310,521 | $9.01M | 0.08% | +43,027+16.1% | Added |
| Swiss National Bank | 311,791 | $9.04M | 0.01% | +5,300+1.7% | Added |
| Legacy Advisors, LLC | 9,814,289 | $9.81M | 1.05% | +9,814,289 | New |
| Ameriprise Financial Inc | 338,599 | $9.82M | 0.00% | −17,347−4.9% | Reduced |
| SG Americas Securities, LLC | 345,341 | $10.0M | 0.01% | +316,277+1,088.2% | Added |
| Aristotle Capital Boston, LLC | 358,867 | $10.4M | 0.57% | −50,276−12.3% | Reduced |
| Legal & General Group Plc | 368,605 | $10.7M | 0.00% | −19,684−5.1% | Reduced |
| First Trust Advisors LP | 377,828 | $11.0M | 0.01% | +339,238+879.1% | Added |
| Vident Advisory, LLC | 382,540 | $11.1M | 0.10% | −72,164−15.9% | Reduced |
| Ancora Advisors, LLC | 402,346 | $11.7M | 0.24% | +268,472+200.5% | Added |
| Ci Investments Inc. | 425,528 | $12.3M | 0.05% | −2,743−0.6% | Reduced |
| Russell Investments Group, Ltd. | 437,016 | $12.7M | 0.01% | +147,467+50.9% | Added |
| Wells Fargo & Company | 464,739 | $13.5M | 0.00% | +421,305+970.0% | Added |
| Moore Capital Management, LP | 475,314 | $13.8M | 0.28% | +67,897+16.7% | Added |
| Hyperion Capital Advisors LP | 491,872 | $14.3M | 6.98% | +71,864+17.1% | Added |
| Royce & Associates LP | 495,286 | $14.4M | 0.15% | +40,786+9.0% | Added |
| Public Sector Pension Investment Board | 530,566 | $15.4M | 0.05% | −67,410−11.3% | Reduced |
| Van Eck Associates Corp | 531,007 | $15.4M | 0.01% | −234,670−30.6% | Reduced |
| New York State Common Retirement Fund | 535,218 | $15.5M | 0.02% | −123,862−18.8% | Reduced |
| Segra Capital Management, LLC | 604,810 | $17.5M | 37.63% | +187,785+45.0% | Added |
| Gotham Asset Management, LLC | 635,430 | $18.4M | 0.07% | +390,604+159.5% | Added |
| Two Sigma Investments, LP | 637,986 | $18.5M | 0.03% | +238,863+59.8% | Added |
| Goldman Sachs Group Inc | 644,158 | $18.7M | 0.00% | −167,773−20.7% | Reduced |
| Point72 Asset Management, L.P. | 695,287 | $20.2M | 0.03% | −685,705−49.7% | Reduced |
| Principal Financial Group Inc | 728,414 | $21.1M | 0.01% | −7,341−1.0% | Reduced |
| Penn Capital Management Co Inc | 743,937 | $21.6M | 1.72% | −216,670−22.6% | Reduced |
| Nuveen, LLC | 813,774 | $23.6M | 0.01% | +62,470+8.3% | Added |
| 683 Capital Management, LLC | 835,000 | $24.2M | 2.01% | −440,000−34.5% | Reduced |
| Avenir Corp | 850,944 | $24.7M | 2.68% | −11,509−1.3% | Reduced |
| Verition Fund Management LLC | 865,172 | $25.1M | 0.14% | −270,454−23.8% | Reduced |
| Cacti Asset Management LLC | 881,692 | $25.7M | 1.59% | +24,600+2.9% | Added |
| Bank of New York Mellon Corp | 922,097 | $26.7M | 0.00% | +55,834+6.4% | Added |
| Northern Trust Corp | 952,977 | $27.6M | 0.00% | +10,032+1.1% | Added |
| Loomis Sayles & Co L P | 1,118,930 | $32.4M | 0.04% | +54,851+5.2% | Added |
| Voya Investment Management LLC | 1,147,477 | $33.3M | 0.03% | +62,508+5.8% | Added |
| Bank of America Corp | 1,157,427 | $33.6M | 0.00% | +358,990+45.0% | Added |
| ExodusPoint Capital Management, LP | 1,184,186 | $34.3M | 0.38% | +1,077,998+1,015.2% | Added |
| Brightline Capital Management, LLC | 1,392,000 | $40.4M | 16.32% | +192,000+16.0% | Added |
| FIL Ltd | 1,429,384 | $41.5M | 0.03% | −129,640−8.3% | Reduced |
| AQR Capital Management LLC | 1,452,049 | $42.1M | 0.02% | +1,286,844+778.9% | Added |
| Cooper Creek Partners Management LLC | 1,553,074 | $45.0M | 2.13% | +1,553,074 | New |
| Arvin Capital Management LP | 1,636,492 | $47.5M | 10.22% | 00.0% | Unchanged |
| Dimensional Fund Advisors LP | 1,832,926 | $53.2M | 0.01% | +526,875+40.3% | Added |
| Thompson Siegel & Walmsley LLC | 1,921,809 | $55.7M | 0.94% | −808,489−29.6% | Reduced |
| Charles Schwab Investment Management Inc | 1,952,002 | $56.6M | 0.01% | +109,831+6.0% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 1,961,927 | $56.9M | 0.09% | −119,684−5.7% | Reduced |
| Thrivent Financial for Lutherans | 2,069,104 | $60.0M | 0.11% | +263,693+14.6% | Added |
| Morgan Stanley | 2,075,352 | $60.2M | 0.00% | +268,935+14.9% | Added |
| Norges Bank | 2,294,097 | $66.5M | 0.01% | +2,294,097 | New |
| Ruane, Cunniff & Goldfarb L.P. | 2,394,129 | $69.4M | 1.08% | −29,619−1.2% | Reduced |
| Geode Capital Management, LLC | 2,659,364 | $77.1M | 0.00% | +5,180+0.2% | Added |
| Colony Group, LLC | 2,794,417 | $81.0M | 0.09% | +2,761,801+8,467.6% | Added |
| State Street Corp | 5,061,620 | $146.8M | 0.00% | −1,771,756−25.9% | Reduced |
| Frontier Capital Management Co LLC | 5,772,976 | $167.4M | 1.78% | +570,296+11.0% | Added |
| FMR LLC | 6,707,304 | $194.5M | 0.01% | +472,055+7.6% | Added |
| Primecap Management Co | 12,126,927 | $351.7M | 0.27% | +208,341+1.7% | Added |
| Vanguard Group Inc | 15,411,745 | $446.9M | 0.01% | −142,946−0.9% | Reduced |
| BlackRock, Inc. | 17,459,099 | $506.3M | 0.01% | −531,350−3.0% | Reduced |
| Invesco Ltd. | 21,834,003 | $633.2M | 0.06% | −282,832−1.3% | Reduced |
| American Securities LLC | 45,026,743 | $1.31B | 100.00% | 00.0% | Unchanged |
| Kovitz Investment Group Partners, LLC | 0 | $0 | 0.00% | −3,007,750−100.0% | Sold out |
| Freestone Grove Partners LP | 0 | $0 | 0.00% | −2,051,859−100.0% | Sold out |
| Discovery Capital Management, LLC | 0 | $0 | 0.00% | −1,139,112−100.0% | Sold out |
| Voss Capital, LLC | 0 | $0 | 0.00% | −625,000−100.0% | Sold out |
| BW Gestao de Investimentos Ltda. | 0 | $0 | 0.00% | −511,477−100.0% | Sold out |
| Trexquant Investment LP | 0 | $0 | 0.00% | −255,748−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −186,223−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −125,542−100.0% | Sold out |
| Dark Forest Capital Management LP | 0 | $0 | 0.00% | −95,866−100.0% | Sold out |
| Illinois Municipal Retirement Fund | 0 | $0 | 0.00% | −82,628−100.0% | Sold out |
| Oppenheimer & Co Inc | 0 | $0 | 0.00% | −75,483−100.0% | Sold out |
| Tudor Investment Corp Et Al | 0 | $0 | 0.00% | −49,133−100.0% | Sold out |
| Kerrisdale Advisers, LLC | 0 | $0 | 0.00% | −39,520−100.0% | Sold out |
| EntryPoint Capital, LLC | 0 | $0 | 0.00% | −38,211−100.0% | Sold out |
| Massar Capital Management, LP | 0 | $0 | 0.00% | −33,183−100.0% | Sold out |
| Sciencast Management LP | 0 | $0 | 0.00% | −29,673−100.0% | Sold out |
| Susquehanna International Group, LLP | 0 | $0 | 0.00% | −26,467−100.0% | Sold out |