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 |
|---|---|---|---|---|---|
| Oxford Asset Management LLP | 18,629 | $540.2K | 0.19% | +18,629 | New |
| Truist Financial Corp | 18,521 | $537.1K | 0.00% | −716−3.7% | Reduced |
| Bridgewater Associates, LP | 18,251 | $529.3K | 0.00% | +18,251 | New |
| JustInvest LLC | 17,751 | $514.8K | 0.01% | +1,999+12.7% | Added |
| Aso Group Ltd | 17,724 | $514.0K | 0.20% | +17,724 | New |
| Sterling Capital Management LLC | 17,578 | $509.8K | 0.01% | +7,617+76.5% | Added |
| Mutual of America Capital Management LLC | 17,521 | $508.1K | 0.01% | +349+2.0% | Added |
| Cambridge Investment Research Advisors, Inc. | 17,306 | $502.0K | 0.00% | −356−2.0% | Reduced |
| Intrinsic Value Partners, LLC | 16,679 | $483.7K | 0.36% | 00.0% | Unchanged |
| Commonwealth Equity Services, LLC | 16,511 | $478.8K | 0.00% | −1,260−7.1% | Reduced |
| Impact Partnership Wealth, LLC | 16,314 | $473.1K | 0.06% | +16,314 | New |
| Gryphon Financial Partners LLC | 16,285 | $472.3K | 0.05% | +16,285 | New |
| Leavell Investment Management, Inc. | 16,137 | $468.0K | 0.02% | 00.0% | Unchanged |
| Profund Advisors LLC | 15,771 | $457.4K | 0.01% | +15,771 | New |
| Toth Financial Advisory Corp | 15,690 | $455.0K | 0.05% | +1,974+14.4% | Added |
| Mackenzie Financial Corp | 15,479 | $452.6K | 0.00% | +15,479 | New |
| Mercer Global Advisors Inc | 15,502 | $452.6K | 0.00% | +15,502 | New |
| Summit Financial, LLC | 15,175 | $440.1K | 0.01% | −12−0.1% | Reduced |
| LuminArx Capital Management LP | 15,000 | $435.0K | 0.42% | +15,000 | New |
| HighTower Advisors, LLC | 14,640 | $424.6K | 0.00% | +638+4.6% | Added |
| First Bank & Trust | 14,166 | $410.8K | 0.07% | −62−0.4% | Reduced |
| First Manhattan Co | 14,117 | $409.4K | 0.00% | −83−0.6% | Reduced |
| Public Employees Retirement Association of Colorado | 13,525 | $392.0K | 0.00% | 00.0% | Unchanged |
| Granite Investment Partners, LLC | 13,248 | $384.2K | 0.02% | −1,510−10.2% | Reduced |
| Evergreen Capital Management LLC | 13,195 | $382.7K | 0.01% | −668−4.8% | Reduced |
| Quadrant Capital Group LLC | 13,054 | $378.6K | 0.01% | −20.0% | Reduced |
| Marex Group plc | 13,002 | $377.1K | 0.00% | +13,002 | New |
| The PNC Financial Services Group, Inc. | 12,623 | $366.1K | 0.00% | −884−6.5% | Reduced |
| Davenport & Co LLC | 12,458 | $361.3K | 0.00% | −1,187−8.7% | Reduced |
| Advyzon Investment Management, LLC | 12,276 | $356.0K | 0.04% | +1,795+17.1% | Added |
| Cahaba Wealth Management, Inc. | 12,076 | $350.2K | 0.02% | 00.0% | Unchanged |
| BCS Private Wealth Management, Inc. | 11,999 | $348.0K | 0.12% | +575+5.0% | Added |
| Franklin Resources Inc | 11,933 | $346.0K | 0.00% | +2,898+32.1% | Added |
| State of Wyoming | 11,916 | $345.6K | 0.04% | +9,120+326.2% | Added |
| Caldwell Investment Management Ltd. | 11,669 | $341.7K | 0.21% | +11,669 | New |
| Penserra Capital Management LLC | 11,268 | $326.0K | 0.00% | +11,268 | New |
| Lipe & Dalton | 10,916 | $317.0K | 0.16% | −212−1.9% | Reduced |
| Shufro Rose & Co LLC | 10,869 | $315.2K | 0.02% | −1,685−13.4% | Reduced |
| Jane Street Group, LLC | 10,809 | $313.5K | 0.00% | −290,452−96.4% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 10,497 | $304.4K | 0.01% | +10,497 | New |
| Grantham, Mayo, Van Otterloo & Co. LLC | 10,457 | $303.3K | 0.00% | 00.0% | Unchanged |
| M&T Bank Corp | 10,067 | $291.9K | 0.00% | +1,536+18.0% | Added |
| 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 |
| Brown Advisory Inc | 9,949 | $288.5K | 0.00% | −202−2.0% | Reduced |
| Allworth Financial LP | 9,848 | $285.6K | 0.00% | −206−2.0% | Reduced |
| SFMG, LLC | 9,772 | $283.4K | 0.02% | −1,880−16.1% | Reduced |
| Virginia Retirement Systems Et Al | 9,600 | $278.4K | 0.00% | +9,600 | New |
| Guggenheim Capital LLC | 9,439 | $273.7K | 0.00% | +9,439 | New |
| PFG Investments, LLC | 9,423 | $273.3K | 0.01% | +721+8.3% | Added |
| Ensign Peak Advisors, Inc | 9,386 | $272.2K | 0.00% | −20,600−68.7% | Reduced |
| CAPROCK Group, Inc. | 9,310 | $270.0K | 0.01% | +9,310 | New |
| Comprehensive Financial Planning, Inc. | 8,830 | $256.1K | 0.17% | +8,830 | New |
| Syon Capital LLC | 8,727 | $253.1K | 0.01% | 00.0% | Unchanged |
| Aberdeen Wealth Management LLC | 8,643 | $250.6K | 0.12% | 00.0% | Unchanged |
| Silvercrest Asset Management Group LLC | 8,515 | $246.9K | 0.00% | −2,121−19.9% | Reduced |
| Xponance, Inc. | 8,438 | $244.7K | 0.00% | +8,438 | New |
| Concurrent Investment Advisors, LLC | 8,382 | $243.1K | 0.00% | +8,382 | New |
| Utah Retirement Systems | 8,339 | $241.8K | 0.00% | +8,339 | New |
| Janney Capital Management LLC | 8,306 | $241.0K | 0.02% | +8,306 | New |
| Wexford Capital LP | 8,251 | $239.3K | 0.06% | +8,251 | New |
| Acadian Asset Management LLC | 8,199 | $237.0K | 0.00% | +8,199 | New |
| Badgley Phelps Wealth Managers, LLC | 8,155 | $236.5K | 0.00% | −816−9.1% | Reduced |
| Lido Advisors, LLC | 9,849 | $236.2K | 0.00% | +60+0.6% | Added |
| Washington Trust Advisors, Inc. | 8,130 | $235.8K | 0.02% | −133−1.6% | Reduced |
| CX Institutional | 7,940 | $230.0K | 0.01% | −135−1.7% | Reduced |
| Smithfield Trust Co | 7,890 | $229.0K | 0.01% | 00.0% | Unchanged |
| FRG Family Wealth Advisors LLC | 7,864 | $228.1K | 0.04% | +7,864 | New |
| Mirabella Financial Services LLP | 7,806 | $226.4K | 0.02% | +7,806 | New |
| Keybank National Association | 7,689 | $223.0K | 0.00% | +7,689 | New |
| Machina Capital S.A.S. | 7,483 | $217.0K | 0.04% | +7,483 | New |
| Summit Trail Advisors, LLC | 7,444 | $215.9K | 0.00% | +7,444 | New |
| Sage Rhino Capital LLC | 7,336 | $212.7K | 0.04% | +7,336 | New |
| Fox Run Management, L.L.C. | 7,248 | $210.2K | 0.03% | +7,248 | New |
| Boothbay Fund Management, LLC | 7,214 | $209.2K | 0.01% | +7,214 | New |
| Formidable Asset Management, LLC | 7,163 | $207.7K | 0.03% | +7,163 | New |
| Swiss Life Asset Management Ltd | 7,085 | $205.5K | 0.00% | +7,085 | New |
| United Capital Financial Advisers, LLC | 6,952 | $201.6K | 0.00% | +6,952 | New |
| BOK Financial Private Wealth, Inc. | 6,910 | $200.4K | 0.01% | −178−2.5% | Reduced |
| KBC Group NV | 5,848 | $170.0K | 0.00% | −278−4.5% | Reduced |
| GAMMA Investing LLC | 5,305 | $153.8K | 0.01% | +284+5.7% | Added |
| Rockefeller Capital Management L.P. | 4,412 | $127.9K | 0.00% | −1,279−22.5% | Reduced |
| SRS Capital Advisors, Inc. | 4,361 | $126.5K | 0.00% | −3,399−43.8% | Reduced |
| Essential Partners LLC | 4,219 | $122.4K | 0.04% | +220+5.5% | Added |
| Parallel Advisors, LLC | 4,196 | $121.7K | 0.00% | +32+0.8% | Added |
| Umb Bank N A | 4,140 | $120.1K | 0.00% | −28−0.7% | Reduced |
| MAI Capital Management | 4,001 | $116.0K | 0.00% | +111+2.9% | Added |
| Danske Bank A/S | 3,962 | $114.9K | 0.00% | +3,962 | New |
| Whittier Trust Co | 3,614 | $113.9K | 0.00% | −385−9.6% | Reduced |
| STRS Ohio | 3,814 | $110.6K | 0.00% | +7+0.2% | Added |
| Kestra Advisory Services, LLC | 3,690 | $107.0K | 0.00% | +3,690 | New |
| CIBC Private Wealth Group, LLC | 3,139 | $91.0K | 0.00% | −2,161−40.8% | Reduced |
| Loring Wolcott & Coolidge Fiduciary Advisors LLP | 2,174 | $76.9K | 0.00% | 00.0% | Unchanged |
| MetLife Investment Management | 2,606 | $75.6K | 0.00% | −49−1.8% | Reduced |
| Fifth Third Bancorp | 2,589 | $75.1K | 0.00% | +249+10.6% | Added |
| Farther Finance Advisors, LLC | 2,390 | $69.3K | 0.00% | −502−17.4% | Reduced |
| Pinnacle Wealth Planning Services, Inc. | 2,384 | $69.1K | 0.01% | +2,384 | New |
| Signaturefd, LLC | 2,343 | $67.9K | 0.00% | +145+6.6% | Added |
| Smartleaf Asset Management LLC | 2,273 | $66.6K | 0.00% | +131+6.1% | Added |
| Quarry LP | 2,063 | $59.8K | 0.01% | +1,397+209.8% | Added |