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
- 219.1M
- +8.19M (+3.9%) vs. Q1 2026
- Total value
- $4.35B
- −$925.1M (−17.5%) vs. Q1 2026
- New holders
- 59
- 150 more added
- Sold out
- 74
- 160 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 |
|---|---|---|---|---|---|
| American Securities LLC | 45,026,743 | $930.7M | 24.79% | 00.0% | Unchanged |
| Invesco Ltd. | 24,954,251 | $515.8M | 0.04% | +3,480,473+16.2% | Added |
| BlackRock, Inc. | 17,906,984 | $370.1M | 0.01% | +65,701+0.4% | Added |
| Primecap Management Co | 12,285,504 | $253.9M | 0.15% | +200,210+1.7% | Added |
| Vanguard Portfolio Management LLC | 7,948,385 | $164.3M | 0.01% | +95,434+1.2% | Added |
| Vanguard Capital Management LLC | 6,711,987 | $138.7M | 0.00% | +61,108+0.9% | Added |
| FMR LLC | 5,679,175 | $117.4M | 0.01% | +100,789+1.8% | Added |
| Dimensional Fund Advisors LP | 5,537,696 | $114.5M | 0.02% | +1,750,276+46.2% | Added |
| State Street Corp | 5,151,772 | $106.5M | 0.00% | +72,731+1.4% | Added |
| Frontier Capital Management Co LLC | 4,143,971 | $85.7M | 0.80% | −786,239−15.9% | Reduced |
| Troluce Capital Advisors LLC | 3,565,399 | $73.7M | 27.60% | +2,565,399+256.5% | Added |
| Geode Capital Management, LLC | 2,716,560 | $56.2M | 0.00% | −97,855−3.5% | Reduced |
| Goldman Sachs Group Inc | 2,711,866 | $56.1M | 0.01% | +1,580,428+139.7% | Added |
| Morgan Stanley | 2,662,329 | $55.0M | 0.00% | +427,416+19.1% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 2,318,581 | $47.9M | 0.06% | −466,553−16.8% | Reduced |
| Thompson Siegel & Walmsley LLC | 2,281,945 | $47.2M | 0.85% | +756,061+49.5% | Added |
| Millennium Management LLC | 2,127,779 | $44.0M | 0.03% | +1,496,724+237.2% | Added |
| Charles Schwab Investment Management Inc | 2,120,102 | $43.8M | 0.01% | +52,172+2.5% | Added |
| Thrivent Financial for Lutherans | 2,105,802 | $43.5M | 0.07% | +5,345+0.3% | Added |
| Bank of America Corp | 2,042,897 | $42.2M | 0.00% | −362,144−15.1% | Reduced |
| Segra Capital Management, LLC | 2,037,890 | $42.1M | 9.68% | +425,164+26.4% | Added |
| Verition Fund Management LLC | 2,019,334 | $41.7M | 0.29% | +721,388+55.6% | Added |
| Van Eck Associates Corp | 1,988,898 | $41.1M | 0.03% | +1,441,254+263.2% | Added |
| Voya Investment Management LLC | 1,974,191 | $40.8M | 0.04% | +774,700+64.6% | Added |
| UBS Group AG | 1,545,183 | $31.9M | 0.01% | −165,592−9.7% | Reduced |
| Norges Bank | 1,516,193 | $31.3M | 0.00% | +1,516,193 | New |
| Permian Investment Partners, LP | 1,433,028 | $29.6M | 3.36% | −133,972−8.5% | Reduced |
| 683 Capital Management, LLC | 1,100,000 | $22.7M | 2.09% | +325,000+41.9% | Added |
| Loomis Sayles & Co L P | 1,042,522 | $21.5M | 0.03% | −38,814−3.6% | Reduced |
| Qube Research & Technologies Ltd | 1,034,395 | $21.4M | 0.02% | +957,026+1,237.0% | Added |
| Northern Trust Corp | 1,029,892 | $21.3M | 0.00% | +45,787+4.7% | Added |
| Vanguard Fiduciary Trust Co | 968,451 | $20.0M | 0.00% | +20,991+2.2% | Added |
| Cacti Asset Management LLC | 881,692 | $18.2M | 0.91% | 00.0% | Unchanged |
| Bank of New York Mellon Corp | 878,084 | $18.2M | 0.00% | −30,515−3.4% | Reduced |
| Russell Investments Group, Ltd. | 840,642 | $17.4M | 0.02% | +126,814+17.8% | Added |
| Avenir Corp | 811,726 | $16.8M | 2.04% | −29,373−3.5% | Reduced |
| Wells Fargo & Company | 750,214 | $15.5M | 0.00% | +113,540+17.8% | Added |
| Principal Financial Group Inc | 742,381 | $15.3M | 0.01% | −2,347−0.3% | Reduced |
| Ancora Advisors, LLC | 715,652 | $14.8M | 0.29% | +12,533+1.8% | Added |
| Royce & Associates LP | 697,368 | $14.4M | 0.12% | +147,590+26.8% | Added |
| HRT Financial LP | 671,847 | $13.9M | 0.03% | +671,847 | New |
| Citadel Advisors LLC | 670,684 | $13.9M | 0.01% | +590,046+731.7% | Added |
| Point72 Asset Management, L.P. | 649,984 | $13.4M | 0.02% | −980,579−60.1% | Reduced |
| AQR Capital Management LLC | 601,900 | $12.4M | 0.00% | +94,057+18.5% | Added |
| First Trust Advisors LP | 547,907 | $11.3M | 0.01% | +319,824+140.2% | Added |
| Ruane, Cunniff & Goldfarb L.P. | 537,213 | $11.1M | 0.17% | −1,085,769−66.9% | Reduced |
| Public Sector Pension Investment Board | 528,821 | $10.9M | 0.03% | −20,976−3.8% | Reduced |
| Loews Corp | 500,000 | $10.3M | 0.08% | +500,000 | New |
| Shapiro Capital Management LLC | 475,970 | $9.84M | 0.60% | +475,970 | New |
| AWH Capital, L.P. | 470,500 | $9.73M | 3.37% | +235,250+100.0% | Added |
| First National Bank of Omaha | 475,992 | $9.72M | 0.27% | +227,988+91.9% | Added |
| Legacy Advisors, LLC | 9,065,677 | $9.07M | 0.85% | +1,3990.0% | Added |
| Nuveen, LLC | 421,495 | $8.71M | 0.00% | −450,300−51.7% | Reduced |
| Arvin Capital Management LP | 416,705 | $8.61M | 1.61% | −1,654,495−79.9% | Reduced |
| Hotchkis & Wiley Capital Management LLC | 402,130 | $8.31M | 0.02% | +68,330+20.5% | Added |
| Susquehanna Fundamental Investments, LLC | 394,370 | $8.15M | 0.15% | +176,590+81.1% | Added |
| Boothbay Fund Management, LLC | 387,973 | $8.02M | 0.15% | +301,781+350.1% | Added |
| De Lisle Partners LLP | 374,818 | $7.74M | 0.85% | −5,000−1.3% | Reduced |
| Vident Advisory, LLC | 372,918 | $7.71M | 0.06% | −15,944−4.1% | Reduced |
| Mawer Investment Management Ltd. | 369,557 | $7.64M | 0.05% | +35,767+10.7% | Added |
| Moore Capital Management, LP | 365,096 | $7.55M | 0.17% | −508,514−58.2% | Reduced |
| Legal & General Group Plc | 349,048 | $7.21M | 0.00% | +14,152+4.2% | Added |
| Jane Street Group, LLC | 343,687 | $7.10M | 0.00% | +151,708+79.0% | Added |
| Susquehanna International Group, LLP | 332,452 | $6.87M | 0.01% | +2,403+0.7% | Added |
| CenterBook Partners LP | 328,766 | $6.80M | 0.33% | +185,068+128.8% | Added |
| Ameriprise Financial Inc | 319,479 | $6.60M | 0.00% | −10,266−3.1% | Reduced |
| Grizzlyrock Capital, LLC | 318,363 | $6.58M | 4.60% | +29,250+10.1% | Added |
| Swiss National Bank | 318,091 | $6.57M | 0.00% | +4,700+1.5% | Added |
| Rovida Investment Management Ltd | 315,000 | $6.50M | 0.44% | 00.0% | Unchanged |
| Aristotle Capital Boston, LLC | 307,836 | $6.36M | 0.43% | −37,140−10.8% | Reduced |
| Exchange Traded Concepts, LLC | 305,286 | $6.31M | 0.03% | +10,278+3.5% | Added |
| Two Sigma Investments, LP | 284,268 | $5.88M | 0.00% | −615,909−68.4% | Reduced |
| Rhumbline Advisers | 284,060 | $5.87M | 0.00% | −16,233−5.4% | Reduced |
| Fifth Third Bancorp | 281,815 | $5.83M | 0.01% | +8,499+3.1% | Added |
| California Public Employees Retirement System | 266,383 | $5.51M | 0.00% | −10,669−3.9% | Reduced |
| SG Americas Securities, LLC | 262,993 | $5.44M | 0.00% | −11,609−4.2% | Reduced |
| Hudson Value Partners, LLC | 250,185 | $5.17M | 1.30% | +46,275+22.7% | Added |
| UBS Asset Management Americas Inc | 249,725 | $5.16M | 0.00% | +1,768+0.7% | Added |
| CSM Advisors, LLC | 243,814 | $5.04M | 0.11% | +162,573+200.1% | Added |
| ExodusPoint Capital Management, LP | 226,289 | $4.68M | 0.04% | +226,289 | New |
| Raymond James Financial Inc | 224,399 | $4.64M | 0.00% | −21,425−8.7% | Reduced |
| Hel Ved Capital Management Ltd | 214,000 | $4.42M | 0.62% | +35,500+19.9% | Added |
| D. E. Shaw & Co., Inc. | 191,488 | $3.96M | 0.00% | +125,317+189.4% | Added |
| SEI Investments Co | 190,069 | $3.93M | 0.00% | −104,599−35.5% | Reduced |
| Wedge Capital Management L L P | 187,832 | $3.88M | 0.06% | +23,166+14.1% | Added |
| Verbena Value LP | 186,200 | $3.85M | 0.64% | +186,200 | New |
| Telos Capital Management, Inc. | 185,611 | $3.84M | 0.34% | −4,290−2.3% | Reduced |
| California State Teachers Retirement System | 183,223 | $3.79M | 0.00% | −1,332−0.7% | Reduced |
| North Growth Management Ltd. | 173,000 | $3.57M | 0.46% | +1,000+0.6% | Added |
| OpenArc Corporate Advisory, LLC | 170,291 | $3.52M | 0.04% | −610.0% | Reduced |
| Brevan Howard Capital Management LP | 167,354 | $3.46M | 0.05% | +90,158+116.8% | Added |
| New York State Teachers Retirement System | 161,992 | $3.35M | 0.01% | −3,337−2.0% | Reduced |
| Atom Investors LP | 160,876 | $3.33M | 0.30% | +138,061+605.1% | Added |
| Gotham Asset Management, LLC | 156,113 | $3.23M | 0.01% | −364,928−70.0% | Reduced |
| Price T Rowe Associates Inc | 152,081 | $3.15M | 0.00% | +6,828+4.7% | Added |
| Barclays PLC | 151,780 | $3.14M | 0.00% | +104,965+224.2% | Added |
| Soviero Asset Management, LP | 150,000 | $3.10M | 1.50% | −90,000−37.5% | Reduced |
| Oppenheimer & Co Inc | 142,974 | $2.96M | 0.03% | −25,898−15.3% | Reduced |
| WSFS Capital Management, LLC | 141,443 | $2.92M | 0.13% | +24,572+21.0% | Added |
| Prudential Financial Inc | 139,950 | $2.89M | 0.00% | −480−0.3% | Reduced |