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 |
|---|---|---|---|---|---|
| California State Teachers Retirement System | 184,555 | $4.81M | 0.01% | +34,643+23.1% | Added |
| Telos Capital Management, Inc. | 189,901 | $4.95M | 0.47% | +2,435+1.3% | Added |
| Jane Street Group, LLC | 191,979 | $5.01M | 0.01% | +181,170+1,676.1% | Added |
| Hudson Value Partners, LLC | 203,910 | $5.32M | 1.59% | +15,917+8.5% | Added |
| Susquehanna Fundamental Investments, LLC | 217,780 | $5.68M | 0.21% | −2,151−1.0% | Reduced |
| First Trust Advisors LP | 228,083 | $5.95M | 0.00% | −149,745−39.6% | Reduced |
| Royal Bank of Canada | 231,742 | $6.04M | 0.00% | −34,801−13.1% | Reduced |
| AWH Capital, L.P. | 235,250 | $6.14M | 5.57% | 00.0% | Unchanged |
| Soviero Asset Management, LP | 240,000 | $6.26M | 3.51% | +62,000+34.8% | Added |
| First National Bank of Omaha | 248,004 | $6.30M | 0.19% | +70,304+39.6% | Added |
| Raymond James Financial Inc | 245,824 | $6.41M | 0.00% | +77,779+46.3% | Added |
| UBS Asset Management Americas Inc | 247,957 | $6.47M | 0.00% | −5,059−2.0% | Reduced |
| Fifth Third Bancorp | 273,316 | $7.13M | 0.01% | +270,727+10,456.8% | Added |
| SG Americas Securities, LLC | 274,602 | $7.16M | 0.01% | −70,739−20.5% | Reduced |
| California Public Employees Retirement System | 277,052 | $7.23M | 0.00% | −1,592−0.6% | Reduced |
| Grizzlyrock Capital, LLC | 289,113 | $7.54M | 5.97% | +4,000+1.4% | Added |
| SEI Investments Co | 294,668 | $7.69M | 0.01% | +77,624+35.8% | Added |
| Exchange Traded Concepts, LLC | 295,008 | $7.69M | 0.06% | −15,513−5.0% | Reduced |
| Rhumbline Advisers | 300,293 | $7.83M | 0.01% | +8,852+3.0% | Added |
| Hyperion Capital Advisors LP | 303,576 | $7.92M | 3.81% | −188,296−38.3% | Reduced |
| Swiss National Bank | 313,391 | $8.17M | 0.00% | +1,600+0.5% | Added |
| Rovida Investment Management Ltd | 315,000 | $8.21M | 1.03% | +315,000 | New |
| Ameriprise Financial Inc | 329,745 | $8.60M | 0.00% | −8,854−2.6% | Reduced |
| Susquehanna International Group, LLP | 330,049 | $8.61M | 0.01% | +330,049 | New |
| Mawer Investment Management Ltd. | 333,790 | $8.71M | 0.06% | +333,790 | New |
| Hotchkis & Wiley Capital Management LLC | 333,800 | $8.71M | 0.03% | +65,425+24.4% | Added |
| Legal & General Group Plc | 334,896 | $8.73M | 0.00% | −33,709−9.1% | Reduced |
| Aristotle Capital Boston, LLC | 344,976 | $9.02M | 0.56% | −13,891−3.9% | Reduced |
| Legacy Advisors, LLC | 9,064,278 | $9.06M | 1.07% | −750,011−7.6% | Reduced |
| De Lisle Partners LLP | 379,818 | $9.90M | 1.18% | +379,818 | New |
| Vident Advisory, LLC | 388,862 | $10.1M | 0.09% | +6,322+1.7% | Added |
| Ci Investments Inc. | 420,068 | $11.0M | 0.05% | −5,460−1.3% | Reduced |
| New York State Common Retirement Fund | 502,487 | $13.1M | 0.02% | −32,731−6.1% | Reduced |
| AQR Capital Management LLC | 507,843 | $13.2M | 0.01% | −944,206−65.0% | Reduced |
| Gotham Asset Management, LLC | 521,041 | $13.6M | 0.04% | −114,389−18.0% | Reduced |
| Van Eck Associates Corp | 547,644 | $14.3M | 0.01% | +16,637+3.1% | Added |
| Royce & Associates LP | 549,778 | $14.3M | 0.14% | +54,492+11.0% | Added |
| Public Sector Pension Investment Board | 549,797 | $14.3M | 0.04% | +19,231+3.6% | Added |
| Millennium Management LLC | 631,055 | $16.5M | 0.01% | +569,868+931.4% | Added |
| Wells Fargo & Company | 636,674 | $16.6M | 0.00% | +171,935+37.0% | Added |
| FIL Ltd | 652,159 | $17.0M | 0.01% | −777,225−54.4% | Reduced |
| Penn Capital Management Co Inc | 694,352 | $18.2M | 1.41% | −49,585−6.7% | Reduced |
| Ancora Advisors, LLC | 703,119 | $18.3M | 0.39% | +300,773+74.8% | Added |
| Russell Investments Group, Ltd. | 713,828 | $18.6M | 0.02% | +276,812+63.3% | Added |
| Principal Financial Group Inc | 744,728 | $19.4M | 0.01% | +16,314+2.2% | Added |
| 683 Capital Management, LLC | 775,000 | $20.2M | 1.87% | −60,000−7.2% | Reduced |
| Avenir Corp | 841,099 | $21.9M | 2.67% | −9,845−1.2% | Reduced |
| Nuveen, LLC | 871,795 | $22.7M | 0.01% | +58,021+7.1% | Added |
| Moore Capital Management, LP | 873,610 | $22.8M | 0.83% | +398,296+83.8% | Added |
| Cacti Asset Management LLC | 881,692 | $23.0M | 1.42% | 00.0% | Unchanged |
| Two Sigma Investments, LP | 900,177 | $23.5M | 0.02% | +262,191+41.1% | Added |
| Bank of New York Mellon Corp | 908,599 | $23.7M | 0.00% | −13,498−1.5% | Reduced |
| Cooper Creek Partners Management LLC | 929,334 | $24.2M | 1.17% | −623,740−40.2% | Reduced |
| Vanguard Fiduciary Trust Co | 947,460 | $24.7M | 0.01% | +947,460 | New |
| Northern Trust Corp | 984,105 | $25.7M | 0.00% | +31,128+3.3% | Added |
| Troluce Capital Advisors LLC | 1,000,000 | $26.1M | 2.76% | +1,000,000 | New |
| Loomis Sayles & Co L P | 1,081,336 | $28.2M | 0.04% | −37,594−3.4% | Reduced |
| Goldman Sachs Group Inc | 1,131,438 | $29.5M | 0.00% | +487,280+75.6% | Added |
| Voya Investment Management LLC | 1,199,491 | $31.3M | 0.03% | +52,014+4.5% | Added |
| Verition Fund Management LLC | 1,297,946 | $33.9M | 0.33% | +432,774+50.0% | Added |
| Brightline Capital Management, LLC | 1,396,000 | $36.4M | 10.77% | +4,000+0.3% | Added |
| Thompson Siegel & Walmsley LLC | 1,525,884 | $39.8M | 0.70% | −395,925−20.6% | Reduced |
| Toronto Dominion Bank | 1,565,223 | $40.8M | 0.08% | +1,565,223 | New |
| Permian Investment Partners, LP | 1,567,000 | $40.9M | 4.52% | +1,567,000 | New |
| Segra Capital Management, LLC | 1,612,726 | $42.1M | 32.74% | +1,007,916+166.7% | Added |
| Ruane, Cunniff & Goldfarb L.P. | 1,622,982 | $42.3M | 0.70% | −771,147−32.2% | Reduced |
| Point72 Asset Management, L.P. | 1,630,563 | $42.5M | 0.07% | +935,276+134.5% | Added |
| UBS Group AG | 1,710,775 | $44.6M | 0.01% | +1,504,673+730.1% | Added |
| Charles Schwab Investment Management Inc | 2,067,930 | $53.9M | 0.01% | +115,928+5.9% | Added |
| Arvin Capital Management LP | 2,071,200 | $54.0M | 12.62% | +434,708+26.6% | Added |
| Thrivent Financial for Lutherans | 2,100,457 | $54.8M | 0.10% | +31,353+1.5% | Added |
| Morgan Stanley | 2,234,913 | $58.3M | 0.00% | +159,561+7.7% | Added |
| Bank of America Corp | 2,405,041 | $62.7M | 0.00% | +1,247,614+107.8% | Added |
| Colony Group, LLC | 2,604,911 | $67.9M | 0.08% | −189,506−6.8% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 2,785,134 | $72.6M | 0.10% | +823,207+42.0% | Added |
| Geode Capital Management, LLC | 2,814,415 | $73.4M | 0.00% | +155,051+5.8% | Added |
| Dimensional Fund Advisors LP | 3,787,420 | $98.8M | 0.02% | +1,954,494+106.6% | Added |
| Frontier Capital Management Co LLC | 4,930,210 | $128.6M | 1.32% | −842,766−14.6% | Reduced |
| State Street Corp | 5,079,041 | $132.5M | 0.00% | +17,421+0.3% | Added |
| FMR LLC | 5,578,386 | $145.5M | 0.01% | −1,128,918−16.8% | Reduced |
| Vanguard Capital Management LLC | 6,650,879 | $173.5M | 0.00% | +6,650,879 | New |
| Vanguard Portfolio Management LLC | 7,852,951 | $204.8M | 0.01% | +7,852,951 | New |
| Primecap Management Co | 12,085,294 | $315.2M | 0.25% | −41,633−0.3% | Reduced |
| BlackRock, Inc. | 17,841,283 | $465.3M | 0.01% | +382,184+2.2% | Added |
| Invesco Ltd. | 21,473,778 | $560.0M | 0.05% | −360,225−1.6% | Reduced |
| American Securities LLC | 45,026,743 | $1.17B | 29.88% | 00.0% | Unchanged |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −1,184,186−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −157,077−100.0% | Sold out |
| Twinbeech Capital LP | 0 | $0 | 0.00% | −137,453−100.0% | Sold out |
| Blackstone Group Inc. | 0 | $0 | 0.00% | −99,643−100.0% | Sold out |
| Resolute Capital Asset Partners LLC | 0 | $0 | 0.00% | −70,000−100.0% | Sold out |
| Mariner, LLC | 0 | $0 | 0.00% | −48,837−100.0% | Sold out |
| Versor Investments LP | 0 | $0 | 0.00% | −42,809−100.0% | Sold out |
| Ieq Capital, LLC | 0 | $0 | 0.00% | −38,025−100.0% | Sold out |
| Capital Fund Management S.A. | 0 | $0 | 0.00% | −36,812−100.0% | Sold out |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −35,084−100.0% | Sold out |
| American Trust Investment Advisors, LLC | 0 | $0 | 0.00% | −29,175−100.0% | Sold out |
| Group One Trading, L.P. | 0 | $0 | 0.00% | −28,498−100.0% | Sold out |
| Alpine Global Management, LLC | 0 | $0 | 0.00% | −25,000−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −24,111−100.0% | Sold out |