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 |
|---|---|---|---|---|---|
| CX Institutional | 7,896 | $206.0K | 0.01% | −44−0.6% | Reduced |
| Empowered Funds, LLC | 7,900 | $206.0K | 0.00% | +7,900 | New |
| Smithfield Trust Co | 7,890 | $207.0K | 0.01% | 00.0% | Unchanged |
| Badgley Phelps Wealth Managers, LLC | 8,038 | $209.6K | 0.00% | −117−1.4% | Reduced |
| Danske Bank A/S | 8,129 | $212.0K | 0.00% | +4,167+105.2% | Added |
| Washington Trust Advisors, Inc. | 8,130 | $212.0K | 0.02% | 00.0% | Unchanged |
| Machina Capital S.A.S. | 8,282 | $216.0K | 0.04% | +799+10.7% | Added |
| State of Wyoming | 8,302 | $216.5K | 0.03% | −3,614−30.3% | Reduced |
| Utah Retirement Systems | 8,339 | $217.5K | 0.00% | 00.0% | Unchanged |
| Alpine Woods Capital Investors, LLC | 8,402 | $219.1K | 0.05% | +8,402 | New |
| Silvercrest Asset Management Group LLC | 8,515 | $222.1K | 0.00% | 00.0% | Unchanged |
| Aberdeen Wealth Management LLC | 8,639 | $225.3K | 0.10% | −40.0% | Reduced |
| Syon Capital LLC | 8,814 | $229.9K | 0.01% | +87+1.0% | Added |
| Vann Equity Management LLC | 9,018 | $235.2K | 0.17% | +9,018 | New |
| Evergreen Capital Management LLC | 9,103 | $237.4K | 0.01% | −4,092−31.0% | Reduced |
| AE Wealth Management LLC | 9,240 | $241.0K | 0.00% | +9,240 | New |
| Ensign Peak Advisors, Inc | 9,386 | $244.8K | 0.00% | 00.0% | Unchanged |
| DRW Securities, LLC | 9,412 | $245.5K | 0.01% | +9,412 | New |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 9,500 | $247.8K | 0.00% | +9,500 | New |
| IHT Wealth Management, LLC | 9,537 | $248.7K | 0.01% | +9,537 | New |
| M&T Bank Corp | 9,610 | $250.7K | 0.00% | −457−4.5% | Reduced |
| Weatherly Asset Management L. P. | 9,690 | $252.7K | 0.02% | +9,690 | New |
| Teacher Retirement System of Texas | 9,732 | $253.8K | 0.00% | −26,099−72.8% | Reduced |
| SFMG, LLC | 9,785 | $255.2K | 0.02% | +13+0.1% | Added |
| Brown Advisory Inc | 9,928 | $258.9K | 0.00% | −21−0.2% | Reduced |
| Allworth Financial LP | 10,004 | $260.9K | 0.00% | +156+1.6% | Added |
| PFG Investments, LLC | 10,332 | $269.5K | 0.01% | +909+9.6% | Added |
| Advyzon Investment Management, LLC | 10,351 | $270.0K | 0.02% | −1,925−15.7% | Reduced |
| Shufro Rose & Co LLC | 10,736 | $280.0K | 0.02% | −133−1.2% | Reduced |
| National Bank of Canada | 10,875 | $283.6K | 0.00% | +9,843+953.8% | Added |
| Lipe & Dalton | 10,916 | $285.0K | 0.15% | 00.0% | Unchanged |
| Caldwell Investment Management Ltd. | 11,669 | $294.1K | 0.12% | 00.0% | Unchanged |
| Xponance, Inc. | 11,481 | $299.4K | 0.00% | +3,043+36.1% | Added |
| Canada Pension Plan Investment Board | 11,594 | $302.4K | 0.00% | −21,400−64.9% | Reduced |
| Franklin Resources Inc | 11,847 | $309.0K | 0.00% | −86−0.7% | Reduced |
| Cahaba Wealth Management, Inc. | 12,076 | $314.9K | 0.02% | 00.0% | Unchanged |
| Lighthouse Investment Partners, LLC | 12,099 | $315.5K | 0.01% | +12,099 | New |
| Janney Montgomery Scott LLC | 12,728 | $332.0K | 0.00% | +12,728 | New |
| First National Advisers, LLC | 12,742 | $332.3K | 0.05% | +12,742 | New |
| Granite Investment Partners, LLC | 13,248 | $345.5K | 0.02% | 00.0% | Unchanged |
| First Bank & Trust | 13,418 | $350.0K | 0.06% | −748−5.3% | Reduced |
| Formidable Asset Management, LLC | 13,473 | $351.4K | 0.05% | +6,310+88.1% | Added |
| Public Employees Retirement Association of Colorado | 13,525 | $353.0K | 0.00% | 00.0% | Unchanged |
| Davenport & Co LLC | 13,558 | $353.6K | 0.00% | +1,100+8.8% | Added |
| Quadrant Capital Group LLC | 13,572 | $354.0K | 0.01% | +518+4.0% | Added |
| The PNC Financial Services Group, Inc. | 13,674 | $356.6K | 0.00% | +1,051+8.3% | Added |
| Intrinsic Value Partners, LLC | 13,899 | $362.5K | 0.28% | −2,780−16.7% | Reduced |
| Summit Trail Advisors, LLC | 13,962 | $364.1K | 0.01% | +6,518+87.6% | Added |
| First Manhattan Co | 14,117 | $368.2K | 0.00% | 00.0% | Unchanged |
| Toroso Investments, LLC | 14,330 | $373.7K | 0.00% | −19,631−57.8% | Reduced |
| Sterling Capital Management LLC | 14,408 | $375.8K | 0.01% | −3,170−18.0% | Reduced |
| BCS Private Wealth Management, Inc. | 14,624 | $381.4K | 0.12% | +2,625+21.9% | Added |
| Mercer Global Advisors Inc | 15,474 | $403.6K | 0.00% | −28−0.2% | Reduced |
| Mackenzie Financial Corp | 16,270 | $424.3K | 0.00% | +791+5.1% | Added |
| Heritage Wealth Advisors | 16,349 | $426.4K | 0.02% | +16,349 | New |
| Truist Financial Corp | 16,390 | $427.4K | 0.00% | −2,131−11.5% | Reduced |
| JustInvest LLC | 16,490 | $430.1K | 0.00% | −1,261−7.1% | Reduced |
| Swiss Life Asset Management Ltd | 16,518 | $430.8K | 0.00% | +9,433+133.1% | Added |
| Leavell Investment Management, Inc. | 16,637 | $433.9K | 0.02% | +500+3.1% | Added |
| Aigen Investment Management, LP | 16,916 | $441.2K | 0.11% | +16,916 | New |
| Bridgewater Associates, LP | 17,052 | $444.7K | 0.00% | −1,199−6.6% | Reduced |
| Commonwealth Equity Services, LLC | 17,480 | $455.9K | 0.00% | +969+5.9% | Added |
| Mutual of America Capital Management LLC | 17,587 | $458.7K | 0.01% | +66+0.4% | Added |
| Aso Group Ltd | 17,724 | $462.0K | 0.19% | 00.0% | Unchanged |
| Security National Bank of Sioux City Iowa | 17,761 | $463.2K | 0.27% | −1,528−7.9% | Reduced |
| EntryPoint Capital, LLC | 17,978 | $468.9K | 0.14% | +17,978 | New |
| Guidance Capital, Inc | 19,471 | $473.5K | 0.11% | +19,471 | New |
| Balyasny Asset Management LLC | 18,345 | $478.4K | 0.00% | −249,654−93.2% | Reduced |
| Modera Wealth Management, LLC | 18,402 | $479.9K | 0.01% | −3,543−16.1% | Reduced |
| CIBC Asset Management Inc | 18,435 | $480.8K | 0.00% | −451−2.4% | Reduced |
| HighTower Advisors, LLC | 18,613 | $485.4K | 0.00% | +3,973+27.1% | Added |
| Gryphon Financial Partners LLC | 18,883 | $492.5K | 0.05% | +2,598+16.0% | Added |
| Cambridge Investment Research Advisors, Inc. | 19,229 | $501.0K | 0.00% | +1,923+11.1% | Added |
| Clifford Swan Investment Counsel LLC | 19,214 | $501.1K | 0.02% | −140−0.7% | Reduced |
| Virginia Retirement Systems Et Al | 19,400 | $506.0K | 0.00% | +9,800+102.1% | Added |
| Allstate Corp | 19,471 | $507.8K | 0.01% | +19,471 | New |
| Moran Wealth Management, LLC | 19,585 | $510.8K | 0.02% | +19,585 | New |
| Deutsche Bank AG | 19,854 | $517.8K | 0.00% | −1,321−6.2% | Reduced |
| Bank of Montreal | 19,966 | $520.7K | 0.00% | +557+2.9% | Added |
| Lathrop Investment Management Corp | 20,044 | $523.0K | 0.10% | −270−1.3% | Reduced |
| Neuberger Berman Group LLC | 20,551 | $536.0K | 0.00% | +1,677+8.9% | Added |
| Aristeia Capital LLC | 20,605 | $537.4K | 0.01% | +20,605 | New |
| Massar Capital Management, LP | 21,056 | $549.1K | 0.11% | +21,056 | New |
| Dover Advisors, LLC | 21,161 | $551.9K | 0.23% | −1,058−4.8% | Reduced |
| Caption Management, LLC | 21,722 | $566.5K | 0.03% | −94,778−81.4% | Reduced |
| Old West Investment Management, LLC | 21,767 | $567.7K | 0.06% | +2,412+12.5% | Added |
| Pathstone Holdings, LLC | 21,794 | $568.4K | 0.00% | −10,132−31.7% | Reduced |
| Neville Rodie & Shaw Inc | 21,810 | $569.0K | 0.04% | −2,118−8.9% | Reduced |
| Stifel Financial Corp | 21,935 | $572.1K | 0.00% | −8,615−28.2% | Reduced |
| Toth Financial Advisory Corp | 22,355 | $583.0K | 0.06% | +6,665+42.5% | Added |
| Atom Investors LP | 22,815 | $595.0K | 0.04% | −20,922−47.8% | Reduced |
| Stephens Inc | 23,395 | $610.1K | 0.01% | +840+3.7% | Added |
| XTX Topco Ltd | 23,787 | $620.4K | 0.01% | −21,034−46.9% | Reduced |
| Peak Asset Management, LLC | 24,000 | $625.9K | 0.11% | 00.0% | Unchanged |
| US Bancorp | 24,277 | $633.1K | 0.00% | −1,323−5.2% | Reduced |
| Cetera Investment Advisers | 24,375 | $635.7K | 0.00% | +3,101+14.6% | Added |
| Security National Bank of So Dak | 26,129 | $681.4K | 0.33% | −513−1.9% | Reduced |
| Sit Investment Associates Inc | 26,202 | $683.0K | 0.01% | 00.0% | Unchanged |
| Pictet Asset Management Holding SA | 26,893 | $701.4K | 0.00% | +1,641+6.5% | Added |
| Entropy Technologies, LP | 26,895 | $701.4K | 0.03% | +26,895 | New |