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, Q3 2025
Institutional positions in Amentum Holdings, Inc. as of Sep 30, 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
- 462
- +6 vs. Q2 2025
- Shares held
- 193.5M
- −7.26M (−3.6%) vs. Q2 2025
- Total value
- $4.63B
- −$106.4M (−2.2%) vs. Q2 2025
- New holders
- 76
- 104 more added
- Sold out
- 70
- 179 more reduced
5 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| American Securities LLC | 45,026,743 | $1.08B | 100.00% | 00.0% | Unchanged |
| Invesco Ltd. | 22,116,835 | $529.7M | 0.08% | +2,539,594+13.0% | Added |
| BlackRock, Inc. | 17,990,449 | $430.9M | 0.01% | −1,004,634−5.3% | Reduced |
| Vanguard Group Inc | 15,554,691 | $372.5M | 0.01% | −979,134−5.9% | Reduced |
| Primecap Management Co | 11,918,586 | $285.5M | 0.22% | −112,070−0.9% | Reduced |
| State Street Corp | 6,833,376 | $163.7M | 0.01% | −244,873−3.5% | Reduced |
| FMR LLC | 6,235,249 | $149.3M | 0.01% | +1,661,319+36.3% | Added |
| Frontier Capital Management Co LLC | 5,202,680 | $124.6M | 1.12% | −258,063−4.7% | Reduced |
| Kovitz Investment Group Partners, LLC | 3,007,750 | $72.0M | 0.28% | +7,080+0.2% | Added |
| Thompson Siegel & Walmsley LLC | 2,730,298 | $65.4M | 1.06% | −56,615−2.0% | Reduced |
| Geode Capital Management, LLC | 2,654,184 | $63.6M | 0.00% | +141,023+5.6% | Added |
| Ruane, Cunniff & Goldfarb L.P. | 2,423,748 | $58.0M | 0.96% | −17,995−0.7% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 2,081,611 | $49.9M | 0.08% | +701,859+50.9% | Added |
| Freestone Grove Partners LP | 2,051,859 | $49.1M | 0.37% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 1,842,171 | $44.1M | 0.01% | +97,158+5.6% | Added |
| Morgan Stanley | 1,806,417 | $43.3M | 0.00% | −370,805−17.0% | Reduced |
| Thrivent Financial for Lutherans | 1,805,411 | $43.2M | 0.09% | +118,306+7.0% | Added |
| Arvin Capital Management LP | 1,636,492 | $39.2M | 9.07% | −502,942−23.5% | Reduced |
| FIL Ltd | 1,559,024 | $37.3M | 0.03% | −508,181−24.6% | Reduced |
| Point72 Asset Management, L.P. | 1,380,992 | $33.1M | 0.07% | +1,030,364+293.9% | Added |
| Dimensional Fund Advisors LP | 1,306,051 | $31.3M | 0.01% | −28,701−2.2% | Reduced |
| 683 Capital Management, LLC | 1,275,000 | $30.5M | 2.77% | −355,000−21.8% | Reduced |
| Brightline Capital Management, LLC | 1,200,000 | $28.7M | 11.78% | +200,000+20.0% | Added |
| Discovery Capital Management, LLC | 1,139,112 | $27.3M | 1.50% | −1,160,018−50.5% | Reduced |
| Verition Fund Management LLC | 1,135,626 | $27.2M | 0.16% | +1,043,145+1,128.0% | Added |
| Voya Investment Management LLC | 1,084,969 | $26.0M | 0.03% | +433,397+66.5% | Added |
| Loomis Sayles & Co L P | 1,064,079 | $25.5M | 0.03% | +4,870+0.5% | Added |
| Penn Capital Management Co Inc | 960,607 | $23.1M | 1.77% | −42,865−4.3% | Reduced |
| Northern Trust Corp | 942,945 | $22.6M | 0.00% | +1,912+0.2% | Added |
| Bank of New York Mellon Corp | 866,263 | $20.7M | 0.00% | −1,943−0.2% | Reduced |
| Avenir Corp | 862,453 | $20.7M | 2.15% | −32,899−3.7% | Reduced |
| Goldman Sachs Group Inc | 811,931 | $19.4M | 0.00% | +573,684+240.8% | Added |
| Cacti Asset Management LLC | 857,092 | $19.3M | 1.27% | +8,146+1.0% | Added |
| Bank of America Corp | 798,437 | $19.1M | 0.00% | −69,828−8.0% | Reduced |
| Van Eck Associates Corp | 765,677 | $18.3M | 0.02% | −2,302,481−75.0% | Reduced |
| Nuveen, LLC | 751,304 | $18.0M | 0.00% | +234,730+45.4% | Added |
| Principal Financial Group Inc | 735,755 | $17.6M | 0.01% | −8,762−1.2% | Reduced |
| New York State Common Retirement Fund | 659,080 | $15.8M | 0.02% | −34,697−5.0% | Reduced |
| Millennium Management LLC | 640,799 | $15.3M | 0.01% | −4,025,416−86.3% | Reduced |
| Voss Capital, LLC | 625,000 | $15.0M | 0.86% | −775,000−55.4% | Reduced |
| Public Sector Pension Investment Board | 597,976 | $14.3M | 0.05% | +83,804+16.3% | Added |
| BW Gestao de Investimentos Ltda. | 511,477 | $12.2M | 0.93% | −203,588−28.5% | Reduced |
| Vident Advisory, LLC | 454,704 | $10.9M | 0.11% | +22,539+5.2% | Added |
| Royce & Associates LP | 454,500 | $10.9M | 0.11% | +119,500+35.7% | Added |
| Ci Investments Inc. | 428,271 | $10.3M | 0.04% | −26,151−5.8% | Reduced |
| Hyperion Capital Advisors LP | 420,008 | $10.1M | 5.38% | +368,521+715.8% | Added |
| Segra Capital Management, LLC | 417,025 | $9.99M | 11.55% | +417,025 | New |
| Aristotle Capital Boston, LLC | 409,143 | $9.80M | 0.51% | −13,833−3.3% | Reduced |
| Moore Capital Management, LP | 407,417 | $9.76M | 0.19% | −203,706−33.3% | Reduced |
| Two Sigma Investments, LP | 399,123 | $9.56M | 0.01% | +385,394+2,807.2% | Added |
| Legal & General Group Plc | 388,289 | $9.30M | 0.00% | −16,384−4.0% | Reduced |
| Ameriprise Financial Inc | 355,946 | $8.52M | 0.00% | +13,084+3.8% | Added |
| Comerica Bank | 312,639 | $7.49M | 0.03% | −49,223−13.6% | Reduced |
| CenterBook Partners LP | 308,081 | $7.38M | 0.36% | +182,741+145.8% | Added |
| Swiss National Bank | 306,491 | $7.34M | 0.00% | +4,300+1.4% | Added |
| Jane Street Group, LLC | 301,261 | $7.22M | 0.01% | +301,261 | New |
| Rhumbline Advisers | 289,818 | $6.94M | 0.01% | +2,571+0.9% | Added |
| Russell Investments Group, Ltd. | 289,549 | $6.93M | 0.01% | −38,633−11.8% | Reduced |
| Grizzlyrock Capital, LLC | 283,113 | $6.78M | 5.27% | +29,750+11.7% | Added |
| UBS Asset Management Americas Inc | 277,897 | $6.66M | 0.00% | −152,645−35.5% | Reduced |
| Hotchkis & Wiley Capital Management LLC | 268,130 | $6.42M | 0.02% | +268,130 | New |
| Exchange Traded Concepts, LLC | 267,494 | $6.41M | 0.06% | +264,162+7,928.0% | Added |
| Trexquant Investment LP | 255,748 | $6.13M | 0.06% | +255,748 | New |
| Gotham Asset Management, LLC | 244,826 | $5.86M | 0.03% | +244,826 | New |
| Royal Bank of Canada | 242,056 | $5.80M | 0.00% | −644,344−72.7% | Reduced |
| AWH Capital, L.P. | 235,250 | $5.63M | 5.88% | +70,000+42.4% | Added |
| California Public Employees Retirement System | 232,009 | $5.56M | 0.00% | +3,088+1.3% | Added |
| UBS Group AG | 231,190 | $5.54M | 0.00% | −535,114−69.8% | Reduced |
| Twinbeech Capital LP | 222,707 | $5.33M | 0.21% | +222,707 | New |
| Algert Global LLC | 221,610 | $5.31M | 0.09% | +197,730+828.0% | Added |
| JPMorgan Chase & Co | 209,542 | $5.02M | 0.00% | +118,220+129.5% | Added |
| CSM Advisors, LLC | 202,807 | $4.86M | 0.14% | −430,241−68.0% | Reduced |
| SEI Investments Co | 200,523 | $4.80M | 0.01% | −18,603−8.5% | Reduced |
| Telos Capital Management, Inc. | 189,859 | $4.55M | 0.44% | −30,859−14.0% | Reduced |
| HRT Financial LP | 186,223 | $4.46M | 0.02% | +186,223 | New |
| Hudson Value Partners, LLC | 185,825 | $4.45M | 1.40% | +124+0.1% | Added |
| Alliancebernstein L.P. | 169,726 | $4.06M | 0.00% | −178,958−51.3% | Reduced |
| AQR Capital Management LLC | 165,205 | $3.96M | 0.00% | −184,998−52.8% | Reduced |
| Country Club Bank | 172,462 | $3.94M | 0.23% | +144+0.1% | Added |
| California State Teachers Retirement System | 162,330 | $3.89M | 0.00% | +330.0% | Added |
| Two Sigma Advisers, LP | 159,168 | $3.81M | 0.01% | +159,168 | New |
| Wealth Enhancement Advisory Services, LLC | 150,345 | $3.80M | 0.01% | −4,759−3.1% | Reduced |
| Soviero Asset Management, LP | 155,000 | $3.71M | 2.29% | +45,000+40.9% | Added |
| Prudential Financial Inc | 147,198 | $3.53M | 0.00% | −2,810−1.9% | Reduced |
| Atom Investors LP | 144,281 | $3.46M | 0.26% | +144,281 | New |
| New York State Teachers Retirement System | 140,918 | $3.38M | 0.01% | +3,483+2.5% | Added |
| Raymond James Financial Inc | 139,403 | $3.34M | 0.00% | −50,407−26.6% | Reduced |
| Ancora Advisors, LLC | 133,874 | $3.21M | 0.06% | +1,670+1.3% | Added |
| Engineers Gate Manager LP | 125,542 | $3.01M | 0.03% | +125,542 | New |
| State Board of Administration of Florida Retirement System | 120,865 | $2.89M | 0.01% | −1,501−1.2% | Reduced |
| Price T Rowe Associates Inc | 118,175 | $2.83M | 0.00% | +12,028+11.3% | Added |
| Citadel Advisors LLC | 117,970 | $2.83M | 0.00% | −224,929−65.6% | Reduced |
| ExodusPoint Capital Management, LP | 106,188 | $2.54M | 0.04% | +96,387+983.4% | Added |
| Gamco Investors, Inc. Et Al | 99,643 | $2.39M | 0.02% | −9,027−8.3% | Reduced |
| North Growth Management Ltd. | 97,000 | $2.31M | 0.40% | 00.0% | Unchanged |
| Dark Forest Capital Management LP | 95,866 | $2.30M | 0.09% | +95,866 | New |
| State of Wisconsin Investment Board | 91,398 | $2.19M | 0.01% | −459−0.5% | Reduced |
| LPL Financial LLC | 90,728 | $2.17M | 0.00% | −50.0% | Reduced |
| Envestnet Asset Management Inc | 89,590 | $2.15M | 0.00% | −7,195−7.4% | Reduced |
| State of New Jersey Common Pension Fund D | 87,642 | $2.10M | 0.01% | −12,462−12.4% | Reduced |