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 $4.35B 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 | $4.35B |
| Q1 2026 | 486 | $5.28B |
| Q4 2025 | 483 | $5.64B |
| Q3 2025 | 462 | $4.63B |
| Q2 2025 | 461 | $4.74B |
| Q1 2025 | 418 | $3.50B |
| Q4 2024 | 451 | $3.50B |
| Q3 2024 | 492 | $3.25B |
| 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 |
|---|---|---|---|---|---|
| American Securities LLC | 45,026,743 | $1.17B | 29.88% | 00.0% | Unchanged |
| Invesco Ltd. | 21,473,778 | $560.0M | 0.05% | −360,225−1.6% | Reduced |
| BlackRock, Inc. | 17,841,283 | $465.3M | 0.01% | +382,184+2.2% | Added |
| Primecap Management Co | 12,085,294 | $315.2M | 0.25% | −41,633−0.3% | Reduced |
| Vanguard Portfolio Management LLC | 7,852,951 | $204.8M | 0.01% | +7,852,951 | New |
| Vanguard Capital Management LLC | 6,650,879 | $173.5M | 0.00% | +6,650,879 | New |
| FMR LLC | 5,578,386 | $145.5M | 0.01% | −1,128,918−16.8% | Reduced |
| State Street Corp | 5,079,041 | $132.5M | 0.00% | +17,421+0.3% | Added |
| Frontier Capital Management Co LLC | 4,930,210 | $128.6M | 1.32% | −842,766−14.6% | Reduced |
| Dimensional Fund Advisors LP | 3,787,420 | $98.8M | 0.02% | +1,954,494+106.6% | Added |
| Geode Capital Management, LLC | 2,814,415 | $73.4M | 0.00% | +155,051+5.8% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 2,785,134 | $72.6M | 0.10% | +823,207+42.0% | Added |
| Colony Group, LLC | 2,604,911 | $67.9M | 0.08% | −189,506−6.8% | Reduced |
| Bank of America Corp | 2,405,041 | $62.7M | 0.00% | +1,247,614+107.8% | Added |
| Morgan Stanley | 2,234,913 | $58.3M | 0.00% | +159,561+7.7% | Added |
| Thrivent Financial for Lutherans | 2,100,457 | $54.8M | 0.10% | +31,353+1.5% | Added |
| Arvin Capital Management LP | 2,071,200 | $54.0M | 12.62% | +434,708+26.6% | Added |
| Charles Schwab Investment Management Inc | 2,067,930 | $53.9M | 0.01% | +115,928+5.9% | Added |
| UBS Group AG | 1,710,775 | $44.6M | 0.01% | +1,504,673+730.1% | Added |
| Point72 Asset Management, L.P. | 1,630,563 | $42.5M | 0.07% | +935,276+134.5% | Added |
| Ruane, Cunniff & Goldfarb L.P. | 1,622,982 | $42.3M | 0.70% | −771,147−32.2% | Reduced |
| Segra Capital Management, LLC | 1,612,726 | $42.1M | 32.74% | +1,007,916+166.7% | Added |
| Permian Investment Partners, LP | 1,567,000 | $40.9M | 4.52% | +1,567,000 | New |
| Toronto Dominion Bank | 1,565,223 | $40.8M | 0.08% | +1,565,223 | New |
| Thompson Siegel & Walmsley LLC | 1,525,884 | $39.8M | 0.70% | −395,925−20.6% | Reduced |
| Brightline Capital Management, LLC | 1,396,000 | $36.4M | 10.77% | +4,000+0.3% | Added |
| Verition Fund Management LLC | 1,297,946 | $33.9M | 0.33% | +432,774+50.0% | Added |
| Voya Investment Management LLC | 1,199,491 | $31.3M | 0.03% | +52,014+4.5% | Added |
| Goldman Sachs Group Inc | 1,131,438 | $29.5M | 0.00% | +487,280+75.6% | Added |
| Loomis Sayles & Co L P | 1,081,336 | $28.2M | 0.04% | −37,594−3.4% | Reduced |
| Troluce Capital Advisors LLC | 1,000,000 | $26.1M | 2.76% | +1,000,000 | New |
| Northern Trust Corp | 984,105 | $25.7M | 0.00% | +31,128+3.3% | Added |
| Vanguard Fiduciary Trust Co | 947,460 | $24.7M | 0.01% | +947,460 | New |
| Cooper Creek Partners Management LLC | 929,334 | $24.2M | 1.17% | −623,740−40.2% | Reduced |
| Bank of New York Mellon Corp | 908,599 | $23.7M | 0.00% | −13,498−1.5% | Reduced |
| Two Sigma Investments, LP | 900,177 | $23.5M | 0.02% | +262,191+41.1% | Added |
| Cacti Asset Management LLC | 881,692 | $23.0M | 1.39% | 00.0% | Unchanged |
| Moore Capital Management, LP | 873,610 | $22.8M | 0.83% | +398,296+83.8% | Added |
| Nuveen, LLC | 871,795 | $22.7M | 0.01% | +58,021+7.1% | Added |
| Avenir Corp | 841,099 | $21.9M | 2.67% | −9,845−1.2% | Reduced |
| 683 Capital Management, LLC | 775,000 | $20.2M | 1.87% | −60,000−7.2% | Reduced |
| Principal Financial Group Inc | 744,728 | $19.4M | 0.01% | +16,314+2.2% | Added |
| Russell Investments Group, Ltd. | 713,828 | $18.6M | 0.02% | +276,812+63.3% | Added |
| Ancora Advisors, LLC | 703,119 | $18.3M | 0.39% | +300,773+74.8% | Added |
| Penn Capital Management Co Inc | 694,352 | $18.2M | 1.41% | −49,585−6.7% | Reduced |
| FIL Ltd | 652,159 | $17.0M | 0.01% | −777,225−54.4% | Reduced |
| Wells Fargo & Company | 636,674 | $16.6M | 0.00% | +171,935+37.0% | Added |
| Millennium Management LLC | 631,055 | $16.5M | 0.01% | +569,868+931.4% | Added |
| Public Sector Pension Investment Board | 549,797 | $14.3M | 0.04% | +19,231+3.6% | Added |
| Royce & Associates LP | 549,778 | $14.3M | 0.14% | +54,492+11.0% | Added |
| Van Eck Associates Corp | 547,644 | $14.3M | 0.01% | +16,637+3.1% | Added |
| Gotham Asset Management, LLC | 521,041 | $13.6M | 0.04% | −114,389−18.0% | Reduced |
| AQR Capital Management LLC | 507,843 | $13.2M | 0.01% | −944,206−65.0% | Reduced |
| New York State Common Retirement Fund | 502,487 | $13.1M | 0.02% | −32,731−6.1% | Reduced |
| Ci Investments Inc. | 420,068 | $11.0M | 0.05% | −5,460−1.3% | Reduced |
| Vident Advisory, LLC | 388,862 | $10.1M | 0.09% | +6,322+1.7% | Added |
| De Lisle Partners LLP | 379,818 | $9.90M | 1.18% | +379,818 | New |
| Legacy Advisors, LLC | 9,064,278 | $9.06M | 1.07% | −750,011−7.6% | Reduced |
| Aristotle Capital Boston, LLC | 344,976 | $9.02M | 0.56% | −13,891−3.9% | Reduced |
| Legal & General Group Plc | 334,896 | $8.73M | 0.00% | −33,709−9.1% | Reduced |
| Hotchkis & Wiley Capital Management LLC | 333,800 | $8.71M | 0.03% | +65,425+24.4% | Added |
| Mawer Investment Management Ltd. | 333,790 | $8.71M | 0.06% | +333,790 | New |
| Susquehanna International Group, LLP | 330,049 | $8.61M | 0.01% | +330,049 | New |
| Ameriprise Financial Inc | 329,745 | $8.60M | 0.00% | −8,854−2.6% | Reduced |
| Rovida Investment Management Ltd | 315,000 | $8.21M | 1.03% | +315,000 | New |
| Swiss National Bank | 313,391 | $8.17M | 0.00% | +1,600+0.5% | Added |
| Hyperion Capital Advisors LP | 303,576 | $7.92M | 3.81% | −188,296−38.3% | Reduced |
| Rhumbline Advisers | 300,293 | $7.83M | 0.01% | +8,852+3.0% | Added |
| Exchange Traded Concepts, LLC | 295,008 | $7.69M | 0.06% | −15,513−5.0% | Reduced |
| SEI Investments Co | 294,668 | $7.69M | 0.01% | +77,624+35.8% | Added |
| Grizzlyrock Capital, LLC | 289,113 | $7.54M | 5.97% | +4,000+1.4% | Added |
| California Public Employees Retirement System | 277,052 | $7.23M | 0.00% | −1,592−0.6% | Reduced |
| SG Americas Securities, LLC | 274,602 | $7.16M | 0.01% | −70,739−20.5% | Reduced |
| Fifth Third Bancorp | 273,316 | $7.13M | 0.01% | +270,727+10,456.8% | Added |
| UBS Asset Management Americas Inc | 247,957 | $6.47M | 0.00% | −5,059−2.0% | Reduced |
| Raymond James Financial Inc | 245,824 | $6.41M | 0.00% | +77,779+46.3% | Added |
| First National Bank of Omaha | 248,004 | $6.30M | 0.19% | +70,304+39.6% | Added |
| Soviero Asset Management, LP | 240,000 | $6.26M | 3.51% | +62,000+34.8% | Added |
| AWH Capital, L.P. | 235,250 | $6.14M | 5.57% | 00.0% | Unchanged |
| Royal Bank of Canada | 231,742 | $6.04M | 0.00% | −34,801−13.1% | Reduced |
| First Trust Advisors LP | 228,083 | $5.95M | 0.00% | −149,745−39.6% | Reduced |
| Susquehanna Fundamental Investments, LLC | 217,780 | $5.68M | 0.21% | −2,151−1.0% | Reduced |
| Hudson Value Partners, LLC | 203,910 | $5.32M | 1.59% | +15,917+8.5% | Added |
| Jane Street Group, LLC | 191,979 | $5.01M | 0.01% | +181,170+1,676.1% | Added |
| Telos Capital Management, Inc. | 189,901 | $4.95M | 0.47% | +2,435+1.3% | Added |
| California State Teachers Retirement System | 184,555 | $4.81M | 0.01% | +34,643+23.1% | Added |
| Hel Ved Capital Management Ltd | 178,500 | $4.66M | 0.81% | +178,500 | New |
| North Growth Management Ltd. | 172,000 | $4.47M | 0.69% | +74,000+75.5% | Added |
| OpenArc Corporate Advisory, LLC | 170,352 | $4.44M | 0.06% | −29,973−15.0% | Reduced |
| Oppenheimer & Co Inc | 168,872 | $4.40M | 0.05% | +168,872 | New |
| New York State Teachers Retirement System | 165,329 | $4.31M | 0.01% | −728−0.4% | Reduced |
| Wedge Capital Management L L P | 164,666 | $4.29M | 0.08% | +164,666 | New |
| Quantinno Capital Management LP | 145,574 | $3.80M | 0.01% | +67,603+86.7% | Added |
| Price T Rowe Associates Inc | 145,253 | $3.79M | 0.00% | +15,771+12.2% | Added |
| CenterBook Partners LP | 143,698 | $3.75M | 0.20% | −78,525−35.3% | Reduced |
| Prudential Financial Inc | 140,430 | $3.66M | 0.00% | −1,992−1.4% | Reduced |
| Vanguard Asset Management, Ltd | 127,793 | $3.33M | 0.00% | +127,793 | New |
| Bessemer Group Inc | 125,952 | $3.28M | 0.01% | +124,213+7,142.8% | Added |
| Holocene Advisors, LP | 123,197 | $3.21M | 0.01% | +43,876+55.3% | Added |
| South Dakota Investment Council | 123,037 | $3.21M | 0.06% | 00.0% | Unchanged |