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, Q4 2025
Institutional positions in Amentum Holdings, Inc. as of Dec 31, 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
- 483
- +31 vs. Q3 2025
- Shares held
- 203.8M
- +10.7M (+5.5%) vs. Q3 2025
- Total value
- $5.64B
- +$1.01B (+21.9%) vs. Q3 2025
- New holders
- 88
- 132 more added
- Sold out
- 57
- 159 more reduced
10 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| SRS Capital Advisors, Inc. | 4,361 | $126.5K | 0.00% | −3,399−43.8% | Reduced |
| Rockefeller Capital Management L.P. | 4,412 | $127.9K | 0.00% | −1,279−22.5% | Reduced |
| GAMMA Investing LLC | 5,305 | $153.8K | 0.01% | +284+5.7% | Added |
| KBC Group NV | 5,848 | $170.0K | 0.00% | −278−4.5% | Reduced |
| BOK Financial Private Wealth, Inc. | 6,910 | $200.4K | 0.01% | −178−2.5% | Reduced |
| United Capital Financial Advisers, LLC | 6,952 | $201.6K | 0.00% | +6,952 | New |
| Swiss Life Asset Management Ltd | 7,085 | $205.5K | 0.00% | +7,085 | New |
| Formidable Asset Management, LLC | 7,163 | $207.7K | 0.03% | +7,163 | New |
| Boothbay Fund Management, LLC | 7,214 | $209.2K | 0.01% | +7,214 | New |
| Fox Run Management, L.L.C. | 7,248 | $210.2K | 0.03% | +7,248 | New |
| Sage Rhino Capital LLC | 7,336 | $212.7K | 0.04% | +7,336 | New |
| Summit Trail Advisors, LLC | 7,444 | $215.9K | 0.00% | +7,444 | New |
| Machina Capital S.A.S. | 7,483 | $217.0K | 0.04% | +7,483 | New |
| Keybank National Association | 7,689 | $223.0K | 0.00% | +7,689 | New |
| Mirabella Financial Services LLP | 7,806 | $226.4K | 0.02% | +7,806 | New |
| FRG Family Wealth Advisors LLC | 7,864 | $228.1K | 0.04% | +7,864 | New |
| Smithfield Trust Co | 7,890 | $229.0K | 0.01% | 00.0% | Unchanged |
| CX Institutional | 7,940 | $230.0K | 0.01% | −135−1.7% | Reduced |
| Washington Trust Advisors, Inc. | 8,130 | $235.8K | 0.02% | −133−1.6% | Reduced |
| Lido Advisors, LLC | 9,849 | $236.2K | 0.00% | +60+0.6% | Added |
| Badgley Phelps Wealth Managers, LLC | 8,155 | $236.5K | 0.00% | −816−9.1% | Reduced |
| Acadian Asset Management LLC | 8,199 | $237.0K | 0.00% | +8,199 | New |
| Wexford Capital LP | 8,251 | $239.3K | 0.06% | +8,251 | New |
| Janney Capital Management LLC | 8,306 | $241.0K | 0.02% | +8,306 | New |
| Utah Retirement Systems | 8,339 | $241.8K | 0.00% | +8,339 | New |
| Concurrent Investment Advisors, LLC | 8,382 | $243.1K | 0.00% | +8,382 | New |
| Xponance, Inc. | 8,438 | $244.7K | 0.00% | +8,438 | New |
| Silvercrest Asset Management Group LLC | 8,515 | $246.9K | 0.00% | −2,121−19.9% | Reduced |
| Aberdeen Wealth Management LLC | 8,643 | $250.6K | 0.12% | 00.0% | Unchanged |
| Syon Capital LLC | 8,727 | $253.1K | 0.01% | 00.0% | Unchanged |
| Comprehensive Financial Planning, Inc. | 8,830 | $256.1K | 0.17% | +8,830 | New |
| CAPROCK Group, Inc. | 9,310 | $270.0K | 0.01% | +9,310 | New |
| Ensign Peak Advisors, Inc | 9,386 | $272.2K | 0.00% | −20,600−68.7% | Reduced |
| PFG Investments, LLC | 9,423 | $273.3K | 0.01% | +721+8.3% | Added |
| Guggenheim Capital LLC | 9,439 | $273.7K | 0.00% | +9,439 | New |
| Virginia Retirement Systems Et Al | 9,600 | $278.4K | 0.00% | +9,600 | New |
| SFMG, LLC | 9,772 | $283.4K | 0.02% | −1,880−16.1% | Reduced |
| Allworth Financial LP | 9,848 | $285.6K | 0.00% | −206−2.0% | Reduced |
| Brown Advisory Inc | 9,949 | $288.5K | 0.00% | −202−2.0% | Reduced |
| ARS Investment Partners, LLC | 10,000 | $290.0K | 0.02% | +1,000+11.1% | Added |
| Symmetry Investments LP | 10,000 | $290.0K | 0.05% | +10,000 | New |
| M&T Bank Corp | 10,067 | $291.9K | 0.00% | +1,536+18.0% | Added |
| Grantham, Mayo, Van Otterloo & Co. LLC | 10,457 | $303.3K | 0.00% | 00.0% | Unchanged |
| Y-Intercept (Hong Kong) Ltd | 10,497 | $304.4K | 0.01% | +10,497 | New |
| Jane Street Group, LLC | 10,809 | $313.5K | 0.00% | −290,452−96.4% | Reduced |
| Shufro Rose & Co LLC | 10,869 | $315.2K | 0.02% | −1,685−13.4% | Reduced |
| Lipe & Dalton | 10,916 | $317.0K | 0.16% | −212−1.9% | Reduced |
| Penserra Capital Management LLC | 11,268 | $326.0K | 0.00% | +11,268 | New |
| Caldwell Investment Management Ltd. | 11,669 | $341.7K | 0.21% | +11,669 | New |
| State of Wyoming | 11,916 | $345.6K | 0.04% | +9,120+326.2% | Added |
| Franklin Resources Inc | 11,933 | $346.0K | 0.00% | +2,898+32.1% | Added |
| BCS Private Wealth Management, Inc. | 11,999 | $348.0K | 0.12% | +575+5.0% | Added |
| Cahaba Wealth Management, Inc. | 12,076 | $350.2K | 0.02% | 00.0% | Unchanged |
| Advyzon Investment Management, LLC | 12,276 | $356.0K | 0.04% | +1,795+17.1% | Added |
| Davenport & Co LLC | 12,458 | $361.3K | 0.00% | −1,187−8.7% | Reduced |
| The PNC Financial Services Group, Inc. | 12,623 | $366.1K | 0.00% | −884−6.5% | Reduced |
| Marex Group plc | 13,002 | $377.1K | 0.00% | +13,002 | New |
| Quadrant Capital Group LLC | 13,054 | $378.6K | 0.01% | −20.0% | Reduced |
| Evergreen Capital Management LLC | 13,195 | $382.7K | 0.01% | −668−4.8% | Reduced |
| Granite Investment Partners, LLC | 13,248 | $384.2K | 0.02% | −1,510−10.2% | Reduced |
| Public Employees Retirement Association of Colorado | 13,525 | $392.0K | 0.00% | 00.0% | Unchanged |
| First Manhattan Co | 14,117 | $409.4K | 0.00% | −83−0.6% | Reduced |
| First Bank & Trust | 14,166 | $410.8K | 0.07% | −62−0.4% | Reduced |
| HighTower Advisors, LLC | 14,640 | $424.6K | 0.00% | +638+4.6% | Added |
| LuminArx Capital Management LP | 15,000 | $435.0K | 0.42% | +15,000 | New |
| Summit Financial, LLC | 15,175 | $440.1K | 0.01% | −12−0.1% | Reduced |
| Mercer Global Advisors Inc | 15,502 | $452.6K | 0.00% | +15,502 | New |
| Mackenzie Financial Corp | 15,479 | $452.6K | 0.00% | +15,479 | New |
| Toth Financial Advisory Corp | 15,690 | $455.0K | 0.05% | +1,974+14.4% | Added |
| Profund Advisors LLC | 15,771 | $457.4K | 0.01% | +15,771 | New |
| Leavell Investment Management, Inc. | 16,137 | $468.0K | 0.02% | 00.0% | Unchanged |
| Gryphon Financial Partners LLC | 16,285 | $472.3K | 0.05% | +16,285 | New |
| Impact Partnership Wealth, LLC | 16,314 | $473.1K | 0.06% | +16,314 | New |
| Commonwealth Equity Services, LLC | 16,511 | $478.8K | 0.00% | −1,260−7.1% | Reduced |
| Intrinsic Value Partners, LLC | 16,679 | $483.7K | 0.36% | 00.0% | Unchanged |
| Cambridge Investment Research Advisors, Inc. | 17,306 | $502.0K | 0.00% | −356−2.0% | Reduced |
| Mutual of America Capital Management LLC | 17,521 | $508.1K | 0.01% | +349+2.0% | Added |
| Sterling Capital Management LLC | 17,578 | $509.8K | 0.01% | +7,617+76.5% | Added |
| Aso Group Ltd | 17,724 | $514.0K | 0.20% | +17,724 | New |
| JustInvest LLC | 17,751 | $514.8K | 0.01% | +1,999+12.7% | Added |
| Bridgewater Associates, LP | 18,251 | $529.3K | 0.00% | +18,251 | New |
| Truist Financial Corp | 18,521 | $537.1K | 0.00% | −716−3.7% | Reduced |
| Oxford Asset Management LLP | 18,629 | $540.2K | 0.19% | +18,629 | New |
| Neuberger Berman Group LLC | 18,874 | $547.3K | 0.00% | +237+1.3% | Added |
| CIBC Asset Management Inc | 18,886 | $547.7K | 0.00% | +4,906+35.1% | Added |
| Legal Advantage Investments, Inc. | 18,900 | $548.1K | 0.25% | +18,900 | New |
| Wellington Management Group LLP | 18,948 | $549.5K | 0.00% | −740−3.8% | Reduced |
| Carlson Capital L P | 19,000 | $551.0K | 0.27% | −5,000−20.8% | Reduced |
| Security National Bank of Sioux City Iowa | 19,289 | $559.4K | 0.36% | −42−0.2% | Reduced |
| Clifford Swan Investment Counsel LLC | 19,354 | $561.3K | 0.02% | −8,718−31.1% | Reduced |
| Old West Investment Management, LLC | 19,355 | $561.3K | 0.10% | +19,355 | New |
| Bank of Montreal | 19,409 | $562.9K | 0.00% | −2,205−10.2% | Reduced |
| Qsemble Capital Management, LP | 20,136 | $583.9K | 0.05% | −1,793−8.2% | Reduced |
| Lathrop Investment Management Corp | 20,314 | $589.0K | 0.11% | −2,503−11.0% | Reduced |
| Magnetar Financial LLC | 20,875 | $605.4K | 0.01% | +20,875 | New |
| Advisors Asset Management, Inc. | 21,078 | $611.3K | 0.01% | −9,986−32.1% | Reduced |
| Deutsche Bank AG | 21,175 | $614.1K | 0.00% | +2,442+13.0% | Added |
| Cetera Investment Advisers | 21,274 | $616.9K | 0.00% | −1,935−8.3% | Reduced |
| Gabelli Funds LLC | 21,388 | $620.3K | 0.00% | −900−4.0% | Reduced |
| Modera Wealth Management, LLC | 21,945 | $636.4K | 0.01% | −815−3.6% | Reduced |