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, Q2 2026
Institutional positions in Amentum Holdings, Inc. as of Jun 30, 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
- 464
- −15 vs. Q1 2026
- Shares held
- 218.9M
- +7.93M (+3.8%) vs. Q1 2026
- Total value
- $4.34B
- −$931.8M (−17.7%) vs. Q1 2026
- New holders
- 59
- 147 more added
- Sold out
- 74
- 161 more reduced
7 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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, Q2 2026
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Susquehanna International Group, LLP | 332,452 | $6.87M | 0.01% | +2,403+0.7% | Added |
| Jane Street Group, LLC | 343,687 | $7.10M | 0.00% | +151,708+79.0% | Added |
| Legal & General Group Plc | 349,048 | $7.21M | 0.00% | +14,152+4.2% | Added |
| Moore Capital Management, LP | 365,096 | $7.55M | 0.17% | −508,514−58.2% | Reduced |
| Mawer Investment Management Ltd. | 369,557 | $7.64M | 0.05% | +35,767+10.7% | Added |
| Vident Advisory, LLC | 372,918 | $7.71M | 0.06% | −15,944−4.1% | Reduced |
| De Lisle Partners LLP | 374,818 | $7.74M | 0.85% | −5,000−1.3% | Reduced |
| Boothbay Fund Management, LLC | 387,973 | $8.02M | 0.15% | +301,781+350.1% | Added |
| Susquehanna Fundamental Investments, LLC | 394,370 | $8.15M | 0.15% | +176,590+81.1% | Added |
| Hotchkis & Wiley Capital Management LLC | 402,130 | $8.31M | 0.02% | +68,330+20.5% | Added |
| Arvin Capital Management LP | 416,705 | $8.61M | 1.61% | −1,654,495−79.9% | Reduced |
| Nuveen, LLC | 421,495 | $8.71M | 0.00% | −450,300−51.7% | Reduced |
| Legacy Advisors, LLC | 9,065,677 | $9.07M | 0.85% | +1,3990.0% | Added |
| First National Bank of Omaha | 475,992 | $9.72M | 0.27% | +227,988+91.9% | Added |
| Shapiro Capital Management LLC | 475,970 | $9.84M | 0.60% | +475,970 | New |
| Loews Corp | 500,000 | $10.3M | 0.08% | +500,000 | New |
| Public Sector Pension Investment Board | 528,821 | $10.9M | 0.03% | −20,976−3.8% | Reduced |
| Ruane, Cunniff & Goldfarb L.P. | 537,213 | $11.1M | 0.17% | −1,085,769−66.9% | Reduced |
| First Trust Advisors LP | 547,907 | $11.3M | 0.01% | +319,824+140.2% | Added |
| AQR Capital Management LLC | 601,900 | $12.4M | 0.00% | +94,057+18.5% | Added |
| Point72 Asset Management, L.P. | 649,984 | $13.4M | 0.02% | −980,579−60.1% | Reduced |
| Citadel Advisors LLC | 670,684 | $13.9M | 0.01% | +590,046+731.7% | Added |
| HRT Financial LP | 671,847 | $13.9M | 0.03% | +671,847 | New |
| Royce & Associates LP | 697,368 | $14.4M | 0.12% | +147,590+26.8% | Added |
| Ancora Advisors, LLC | 715,652 | $14.8M | 0.29% | +12,533+1.8% | Added |
| Principal Financial Group Inc | 742,381 | $15.3M | 0.01% | −2,347−0.3% | Reduced |
| Wells Fargo & Company | 750,214 | $15.5M | 0.00% | +113,540+17.8% | Added |
| Avenir Corp | 811,726 | $16.8M | 2.04% | −29,373−3.5% | Reduced |
| Russell Investments Group, Ltd. | 840,642 | $17.4M | 0.02% | +126,814+17.8% | Added |
| Bank of New York Mellon Corp | 878,084 | $18.2M | 0.00% | −30,515−3.4% | Reduced |
| Cacti Asset Management LLC | 881,692 | $18.2M | 0.91% | 00.0% | Unchanged |
| Vanguard Fiduciary Trust Co | 968,451 | $20.0M | 0.00% | +20,991+2.2% | Added |
| Northern Trust Corp | 1,029,892 | $21.3M | 0.00% | +45,787+4.7% | Added |
| Qube Research & Technologies Ltd | 1,034,395 | $21.4M | 0.02% | +957,026+1,237.0% | Added |
| Loomis Sayles & Co L P | 1,042,522 | $21.5M | 0.03% | −38,814−3.6% | Reduced |
| 683 Capital Management, LLC | 1,100,000 | $22.7M | 2.09% | +325,000+41.9% | Added |
| Permian Investment Partners, LP | 1,433,028 | $29.6M | 3.36% | −133,972−8.5% | Reduced |
| Norges Bank | 1,516,193 | $31.3M | 0.00% | +1,516,193 | New |
| UBS Group AG | 1,545,183 | $31.9M | 0.01% | −165,592−9.7% | Reduced |
| Voya Investment Management LLC | 1,974,191 | $40.8M | 0.04% | +774,700+64.6% | Added |
| Van Eck Associates Corp | 1,988,898 | $41.1M | 0.03% | +1,441,254+263.2% | Added |
| Verition Fund Management LLC | 2,019,334 | $41.7M | 0.29% | +721,388+55.6% | Added |
| Segra Capital Management, LLC | 2,037,890 | $42.1M | 9.68% | +425,164+26.4% | Added |
| Bank of America Corp | 2,042,897 | $42.2M | 0.00% | −362,144−15.1% | Reduced |
| Thrivent Financial for Lutherans | 2,105,802 | $43.5M | 0.07% | +5,345+0.3% | Added |
| Charles Schwab Investment Management Inc | 2,120,102 | $43.8M | 0.01% | +52,172+2.5% | Added |
| Millennium Management LLC | 2,127,779 | $44.0M | 0.03% | +1,496,724+237.2% | Added |
| Thompson Siegel & Walmsley LLC | 2,281,945 | $47.2M | 0.85% | +756,061+49.5% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 2,318,581 | $47.9M | 0.06% | −466,553−16.8% | Reduced |
| Morgan Stanley | 2,662,329 | $55.0M | 0.00% | +427,416+19.1% | Added |
| Goldman Sachs Group Inc | 2,711,866 | $56.1M | 0.01% | +1,580,428+139.7% | Added |
| Geode Capital Management, LLC | 2,716,560 | $56.2M | 0.00% | −97,855−3.5% | Reduced |
| Troluce Capital Advisors LLC | 3,565,399 | $73.7M | 27.60% | +2,565,399+256.5% | Added |
| Frontier Capital Management Co LLC | 4,143,971 | $85.7M | 0.80% | −786,239−15.9% | Reduced |
| State Street Corp | 5,151,772 | $106.5M | 0.00% | +72,731+1.4% | Added |
| Dimensional Fund Advisors LP | 5,537,696 | $114.5M | 0.02% | +1,750,276+46.2% | Added |
| FMR LLC | 5,679,175 | $117.4M | 0.01% | +100,789+1.8% | Added |
| Vanguard Capital Management LLC | 6,711,987 | $138.7M | 0.00% | +61,108+0.9% | Added |
| Vanguard Portfolio Management LLC | 7,948,385 | $164.3M | 0.01% | +95,434+1.2% | Added |
| Primecap Management Co | 12,285,504 | $253.9M | 0.15% | +200,210+1.7% | Added |
| BlackRock, Inc. | 17,906,984 | $370.1M | 0.01% | +65,701+0.4% | Added |
| Invesco Ltd. | 24,954,251 | $515.8M | 0.04% | +3,480,473+16.2% | Added |
| American Securities LLC | 45,026,743 | $930.7M | 24.79% | 00.0% | Unchanged |
| BDF-Gestion | 676 | – | – | −76−10.1% | Reduced |
| Toronto Dominion Bank | 0 | $0 | 0.00% | −1,565,223−100.0% | Sold out |
| Brightline Capital Management, LLC | 0 | $0 | 0.00% | −1,396,000−100.0% | Sold out |
| Cooper Creek Partners Management LLC | 0 | $0 | 0.00% | −929,334−100.0% | Sold out |
| Penn Capital Management Co Inc | 0 | $0 | 0.00% | −694,352−100.0% | Sold out |
| Ci Investments Inc. | 0 | $0 | 0.00% | −420,068−100.0% | Sold out |
| Hyperion Capital Advisors LP | 0 | $0 | 0.00% | −303,576−100.0% | Sold out |
| Oak Thistle LLC | 0 | $0 | 0.00% | −71,759−100.0% | Sold out |
| K2 Principal Fund, L.P. | 0 | $0 | 0.00% | −60,000−100.0% | Sold out |
| Marex Group plc | 0 | $0 | 0.00% | −53,043−100.0% | Sold out |
| Mirabella Financial Services LLP | 0 | $0 | 0.00% | −52,498−100.0% | Sold out |
| Maverick Capital LtdSuperinvestorMaverick Capital | 0 | $0 | 0.00% | −46,335−100.0% | Sold out |
| Landscape Capital Management, L.L.C. | 0 | $0 | 0.00% | −40,393−100.0% | Sold out |
| Walleye Trading LLC | 0 | $0 | 0.00% | −28,548−100.0% | Sold out |
| Stifel Financial Corp | 0 | $0 | 0.00% | −21,935−100.0% | Sold out |
| Massar Capital Management, LP | 0 | $0 | 0.00% | −21,056−100.0% | Sold out |
| Aristeia Capital LLC | 0 | $0 | 0.00% | −20,605−100.0% | Sold out |
| Allstate Corp | 0 | $0 | 0.00% | −19,471−100.0% | Sold out |
| Modera Wealth Management, LLC | 0 | $0 | 0.00% | −18,402−100.0% | Sold out |
| EntryPoint Capital, LLC | 0 | $0 | 0.00% | −17,978−100.0% | Sold out |
| Aigen Investment Management, LP | 0 | $0 | 0.00% | −16,916−100.0% | Sold out |
| Mackenzie Financial Corp | 0 | $0 | 0.00% | −16,270−100.0% | Sold out |
| BCS Private Wealth Management, Inc. | 0 | $0 | 0.00% | −14,624−100.0% | Sold out |
| Davenport & Co LLC | 0 | $0 | 0.00% | −13,558−100.0% | Sold out |
| Lighthouse Investment Partners, LLC | 0 | $0 | 0.00% | −12,099−100.0% | Sold out |
| Canada Pension Plan Investment Board | 0 | $0 | 0.00% | −11,594−100.0% | Sold out |
| Caldwell Investment Management Ltd. | 0 | $0 | 0.00% | −11,669−100.0% | Sold out |
| Brown Advisory Inc | 0 | $0 | 0.00% | −9,928−100.0% | Sold out |
| M&T Bank Corp | 0 | $0 | 0.00% | −9,610−100.0% | Sold out |
| IHT Wealth Management, LLC | 0 | $0 | 0.00% | −9,537−100.0% | Sold out |
| DRW Securities, LLC | 0 | $0 | 0.00% | −9,412−100.0% | Sold out |
| Evergreen Capital Management LLC | 0 | $0 | 0.00% | −9,103−100.0% | Sold out |
| Vann Equity Management LLC | 0 | $0 | 0.00% | −9,018−100.0% | Sold out |
| Syon Capital LLC | 0 | $0 | 0.00% | −8,814−100.0% | Sold out |
| Silvercrest Asset Management Group LLC | 0 | $0 | 0.00% | −8,515−100.0% | Sold out |
| Alpine Woods Capital Investors, LLC | 0 | $0 | 0.00% | −8,402−100.0% | Sold out |
| Utah Retirement Systems | 0 | $0 | 0.00% | −8,339−100.0% | Sold out |