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, Q1 2026
Institutional positions in Amentum Holdings, Inc. as of Mar 31, 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
- 486
- +10 vs. Q4 2025
- Shares held
- 211.1M
- +25.3M (+13.6%) vs. Q4 2025
- Total value
- $5.28B
- +$162.1M (+3.2%) vs. Q4 2025
- New holders
- 70
- 151 more added
- Sold out
- 60
- 152 more reduced
7 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Old West Investment Management, LLC | 21,767 | $567.7K | 0.06% | +2,412+12.5% | Added |
| Caption Management, LLC | 21,722 | $566.5K | 0.03% | −94,778−81.4% | Reduced |
| Dover Advisors, LLC | 21,161 | $551.9K | 0.23% | −1,058−4.8% | Reduced |
| Massar Capital Management, LP | 21,056 | $549.1K | 0.11% | +21,056 | New |
| Aristeia Capital LLC | 20,605 | $537.4K | 0.01% | +20,605 | New |
| Neuberger Berman Group LLC | 20,551 | $536.0K | 0.00% | +1,677+8.9% | Added |
| Lathrop Investment Management Corp | 20,044 | $523.0K | 0.10% | −270−1.3% | Reduced |
| Bank of Montreal | 19,966 | $520.7K | 0.00% | +557+2.9% | Added |
| Deutsche Bank AG | 19,854 | $517.8K | 0.00% | −1,321−6.2% | Reduced |
| Moran Wealth Management, LLC | 19,585 | $510.8K | 0.02% | +19,585 | New |
| Allstate Corp | 19,471 | $507.8K | 0.01% | +19,471 | New |
| Virginia Retirement Systems Et Al | 19,400 | $506.0K | 0.00% | +9,800+102.1% | Added |
| Clifford Swan Investment Counsel LLC | 19,214 | $501.1K | 0.02% | −140−0.7% | Reduced |
| Cambridge Investment Research Advisors, Inc. | 19,229 | $501.0K | 0.00% | +1,923+11.1% | Added |
| Gryphon Financial Partners LLC | 18,883 | $492.5K | 0.05% | +2,598+16.0% | Added |
| HighTower Advisors, LLC | 18,613 | $485.4K | 0.00% | +3,973+27.1% | Added |
| CIBC Asset Management Inc | 18,435 | $480.8K | 0.00% | −451−2.4% | Reduced |
| Modera Wealth Management, LLC | 18,402 | $479.9K | 0.01% | −3,543−16.1% | Reduced |
| Balyasny Asset Management LLC | 18,345 | $478.4K | 0.00% | −249,654−93.2% | Reduced |
| Guidance Capital, Inc | 19,471 | $473.5K | 0.11% | +19,471 | New |
| EntryPoint Capital, LLC | 17,978 | $468.9K | 0.14% | +17,978 | New |
| Security National Bank of Sioux City Iowa | 17,761 | $463.2K | 0.27% | −1,528−7.9% | Reduced |
| Aso Group Ltd | 17,724 | $462.0K | 0.19% | 00.0% | Unchanged |
| Mutual of America Capital Management LLC | 17,587 | $458.7K | 0.01% | +66+0.4% | Added |
| Commonwealth Equity Services, LLC | 17,480 | $455.9K | 0.00% | +969+5.9% | Added |
| Bridgewater Associates, LP | 17,052 | $444.7K | 0.00% | −1,199−6.6% | Reduced |
| Aigen Investment Management, LP | 16,916 | $441.2K | 0.11% | +16,916 | New |
| Leavell Investment Management, Inc. | 16,637 | $433.9K | 0.02% | +500+3.1% | Added |
| Swiss Life Asset Management Ltd | 16,518 | $430.8K | 0.00% | +9,433+133.1% | Added |
| JustInvest LLC | 16,490 | $430.1K | 0.00% | −1,261−7.1% | Reduced |
| Truist Financial Corp | 16,390 | $427.4K | 0.00% | −2,131−11.5% | Reduced |
| Heritage Wealth Advisors | 16,349 | $426.4K | 0.02% | +16,349 | New |
| Mackenzie Financial Corp | 16,270 | $424.3K | 0.00% | +791+5.1% | Added |
| Mercer Global Advisors Inc | 15,474 | $403.6K | 0.00% | −28−0.2% | Reduced |
| BCS Private Wealth Management, Inc. | 14,624 | $381.4K | 0.12% | +2,625+21.9% | Added |
| Sterling Capital Management LLC | 14,408 | $375.8K | 0.01% | −3,170−18.0% | Reduced |
| Toroso Investments, LLC | 14,330 | $373.7K | 0.00% | −19,631−57.8% | Reduced |
| First Manhattan Co | 14,117 | $368.2K | 0.00% | 00.0% | Unchanged |
| Summit Trail Advisors, LLC | 13,962 | $364.1K | 0.01% | +6,518+87.6% | Added |
| Intrinsic Value Partners, LLC | 13,899 | $362.5K | 0.28% | −2,780−16.7% | Reduced |
| The PNC Financial Services Group, Inc. | 13,674 | $356.6K | 0.00% | +1,051+8.3% | Added |
| Quadrant Capital Group LLC | 13,572 | $354.0K | 0.01% | +518+4.0% | Added |
| Davenport & Co LLC | 13,558 | $353.6K | 0.00% | +1,100+8.8% | Added |
| Public Employees Retirement Association of Colorado | 13,525 | $353.0K | 0.00% | 00.0% | Unchanged |
| Formidable Asset Management, LLC | 13,473 | $351.4K | 0.05% | +6,310+88.1% | Added |
| First Bank & Trust | 13,418 | $350.0K | 0.06% | −748−5.3% | Reduced |
| Granite Investment Partners, LLC | 13,248 | $345.5K | 0.02% | 00.0% | Unchanged |
| First National Advisers, LLC | 12,742 | $332.3K | 0.05% | +12,742 | New |
| Janney Montgomery Scott LLC | 12,728 | $332.0K | 0.00% | +12,728 | New |
| Lighthouse Investment Partners, LLC | 12,099 | $315.5K | 0.01% | +12,099 | New |
| Cahaba Wealth Management, Inc. | 12,076 | $314.9K | 0.02% | 00.0% | Unchanged |
| Franklin Resources Inc | 11,847 | $309.0K | 0.00% | −86−0.7% | Reduced |
| Canada Pension Plan Investment Board | 11,594 | $302.4K | 0.00% | −21,400−64.9% | Reduced |
| Xponance, Inc. | 11,481 | $299.4K | 0.00% | +3,043+36.1% | Added |
| Caldwell Investment Management Ltd. | 11,669 | $294.1K | 0.12% | 00.0% | Unchanged |
| Lipe & Dalton | 10,916 | $285.0K | 0.15% | 00.0% | Unchanged |
| National Bank of Canada | 10,875 | $283.6K | 0.00% | +9,843+953.8% | Added |
| Shufro Rose & Co LLC | 10,736 | $280.0K | 0.02% | −133−1.2% | Reduced |
| Advyzon Investment Management, LLC | 10,351 | $270.0K | 0.02% | −1,925−15.7% | Reduced |
| PFG Investments, LLC | 10,332 | $269.5K | 0.01% | +909+9.6% | Added |
| Allworth Financial LP | 10,004 | $260.9K | 0.00% | +156+1.6% | Added |
| Brown Advisory Inc | 9,928 | $258.9K | 0.00% | −21−0.2% | Reduced |
| SFMG, LLC | 9,785 | $255.2K | 0.02% | +13+0.1% | Added |
| Teacher Retirement System of Texas | 9,732 | $253.8K | 0.00% | −26,099−72.8% | Reduced |
| Weatherly Asset Management L. P. | 9,690 | $252.7K | 0.02% | +9,690 | New |
| M&T Bank Corp | 9,610 | $250.7K | 0.00% | −457−4.5% | Reduced |
| IHT Wealth Management, LLC | 9,537 | $248.7K | 0.01% | +9,537 | New |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 9,500 | $247.8K | 0.00% | +9,500 | New |
| DRW Securities, LLC | 9,412 | $245.5K | 0.01% | +9,412 | New |
| Ensign Peak Advisors, Inc | 9,386 | $244.8K | 0.00% | 00.0% | Unchanged |
| AE Wealth Management LLC | 9,240 | $241.0K | 0.00% | +9,240 | New |
| Evergreen Capital Management LLC | 9,103 | $237.4K | 0.01% | −4,092−31.0% | Reduced |
| Vann Equity Management LLC | 9,018 | $235.2K | 0.17% | +9,018 | New |
| Syon Capital LLC | 8,814 | $229.9K | 0.01% | +87+1.0% | Added |
| Aberdeen Wealth Management LLC | 8,639 | $225.3K | 0.10% | −40.0% | Reduced |
| Silvercrest Asset Management Group LLC | 8,515 | $222.1K | 0.00% | 00.0% | Unchanged |
| Alpine Woods Capital Investors, LLC | 8,402 | $219.1K | 0.05% | +8,402 | New |
| Utah Retirement Systems | 8,339 | $217.5K | 0.00% | 00.0% | Unchanged |
| State of Wyoming | 8,302 | $216.5K | 0.03% | −3,614−30.3% | Reduced |
| Machina Capital S.A.S. | 8,282 | $216.0K | 0.04% | +799+10.7% | Added |
| Washington Trust Advisors, Inc. | 8,130 | $212.0K | 0.02% | 00.0% | Unchanged |
| Danske Bank A/S | 8,129 | $212.0K | 0.00% | +4,167+105.2% | Added |
| Badgley Phelps Wealth Managers, LLC | 8,038 | $209.6K | 0.00% | −117−1.4% | Reduced |
| Smithfield Trust Co | 7,890 | $207.0K | 0.01% | 00.0% | Unchanged |
| Empowered Funds, LLC | 7,900 | $206.0K | 0.00% | +7,900 | New |
| CX Institutional | 7,896 | $206.0K | 0.01% | −44−0.6% | Reduced |
| Strategic Equity Management | 7,844 | $204.6K | 0.08% | +7,844 | New |
| CAPROCK Group, Inc. | 7,842 | $204.5K | 0.00% | −1,468−15.8% | Reduced |
| FRG Family Wealth Advisors LLC | 7,831 | $204.2K | 0.03% | −33−0.4% | Reduced |
| BOK Financial Private Wealth, Inc. | 6,124 | $159.7K | 0.01% | −786−11.4% | Reduced |
| MAI Capital Management | 6,094 | $158.9K | 0.00% | +2,093+52.3% | Added |
| Acadian Asset Management LLC | 5,957 | $155.0K | 0.00% | −2,242−27.3% | Reduced |
| GAMMA Investing LLC | 5,659 | $147.6K | 0.01% | +354+6.7% | Added |
| KBC Group NV | 5,431 | $142.0K | 0.00% | −417−7.1% | Reduced |
| TD Waterhouse Canada Inc. | 4,448 | $117.2K | 0.00% | +3,918+739.2% | Added |
| Parallel Advisors, LLC | 4,295 | $112.0K | 0.00% | +99+2.4% | Added |
| Rockefeller Capital Management L.P. | 4,251 | $110.9K | 0.00% | −161−3.6% | Reduced |
| Essential Partners LLC | 4,212 | $109.8K | 0.04% | −7−0.2% | Reduced |
| Walleye Capital LLC | 3,827 | $99.8K | 0.00% | +3,716+3,347.7% | Added |
| STRS Ohio | 3,808 | $99.3K | 0.00% | −6−0.2% | Reduced |