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, Q2 2026
Institutional positions in Amentum Holdings, Inc. as of Jun 30, 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
- 464
- −15 vs. Q1 2026
- Shares held
- 218.9M
- +7.93M (+3.8%) vs. Q1 2026
- Total value
- $4.34B
- −$930.3M (−17.6%) vs. Q1 2026
- New holders
- 59
- 147 more added
- Sold out
- 74
- 161 more reduced
7 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: 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, Q2 2026
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Swiss Life Asset Management Ltd | 10,448 | $216.0K | 0.00% | −6,070−36.7% | Reduced |
| Janney Montgomery Scott LLC | 10,442 | $216.0K | 0.00% | −2,286−18.0% | Reduced |
| Shufro Rose & Co LLC | 10,734 | $221.9K | 0.01% | −20.0% | Reduced |
| Xponance, Inc. | 10,908 | $225.5K | 0.00% | −573−5.0% | Reduced |
| Lipe & Dalton | 10,916 | $226.0K | 0.11% | 00.0% | Unchanged |
| PFG Investments, LLC | 11,351 | $234.6K | 0.01% | +1,019+9.9% | Added |
| 111 Capital | 11,779 | $243.5K | 0.04% | +11,779 | New |
| The PNC Financial Services Group, Inc. | 12,020 | $248.5K | 0.00% | −1,654−12.1% | Reduced |
| Cahaba Wealth Management, Inc. | 12,076 | $249.6K | 0.02% | 00.0% | Unchanged |
| Mitsubishi UFJ Trust & Banking Corp | 12,499 | $258.4K | 0.00% | +12,499 | New |
| Cetera Investment Advisers | 12,885 | $266.3K | 0.00% | −11,490−47.1% | Reduced |
| Mercer Global Advisors Inc | 12,996 | $268.6K | 0.00% | −2,478−16.0% | Reduced |
| Quadrant Capital Group LLC | 13,002 | $268.8K | 0.01% | −570−4.2% | Reduced |
| First Bank & Trust | 13,029 | $269.3K | 0.04% | −389−2.9% | Reduced |
| Formidable Asset Management, LLC | 13,065 | $270.1K | 0.04% | −408−3.0% | Reduced |
| Granite Investment Partners, LLC | 13,248 | $273.8K | 0.01% | 00.0% | Unchanged |
| Sterling Capital Management LLC | 13,388 | $276.7K | 0.00% | −1,020−7.1% | Reduced |
| Intrinsic Value Partners, LLC | 13,399 | $277.0K | 0.19% | −500−3.6% | Reduced |
| Public Employees Retirement Association of Colorado | 13,525 | $280.0K | 0.00% | 00.0% | Unchanged |
| Franklin Resources Inc | 13,587 | $280.8K | 0.00% | +1,740+14.7% | Added |
| Walleye Capital LLC | 13,836 | $286.0K | 0.00% | +10,009+261.5% | Added |
| HighTower Advisors, LLC | 14,108 | $291.6K | 0.00% | −4,505−24.2% | Reduced |
| First Manhattan Co | 14,242 | $294.4K | 0.00% | +125+0.9% | Added |
| Moran Wealth Management, LLC | 15,076 | $311.6K | 0.01% | −4,509−23.0% | Reduced |
| Caitong International Asset Management Co., Ltd | 15,239 | $315.0K | 0.04% | +12,302+418.9% | Added |
| Truist Financial Corp | 15,323 | $316.7K | 0.00% | −1,067−6.5% | Reduced |
| Heritage Wealth Advisors | 15,532 | $321.0K | 0.01% | −817−5.0% | Reduced |
| Sanctuary Advisors, LLC | 15,732 | $325.2K | 0.00% | +15,732 | New |
| Teacher Retirement System of Texas | 15,882 | $328.3K | 0.00% | +6,150+63.2% | Added |
| Elo Mutual Pension Insurance Co | 16,030 | $331.3K | 0.00% | +16,030 | New |
| Cambridge Investment Research Advisors, Inc. | 16,485 | $341.0K | 0.00% | −2,744−14.3% | Reduced |
| Machina Capital S.A.S. | 16,681 | $344.8K | 0.05% | +8,399+101.4% | Added |
| Simplex Trading, LLC | 17,003 | $351.5K | 0.01% | +17,003 | New |
| CIBC Asset Management Inc | 17,104 | $353.5K | 0.00% | −1,331−7.2% | Reduced |
| JustInvest LLC | 17,111 | $353.7K | 0.00% | +621+3.8% | Added |
| Clifford Swan Investment Counsel LLC | 17,495 | $361.6K | 0.01% | −1,719−8.9% | Reduced |
| Shay Capital LLC | 17,500 | $361.7K | 0.04% | +17,500 | New |
| State of Wyoming | 17,667 | $365.2K | 0.04% | +9,365+112.8% | Added |
| Aso Group Ltd | 17,724 | $366.0K | 0.16% | 00.0% | Unchanged |
| Toth Financial Advisory Corp | 18,226 | $376.7K | 0.04% | −4,129−18.5% | Reduced |
| Hancock Whitney Corp | 18,236 | $376.9K | 0.01% | +18,236 | New |
| Commonwealth Equity Services, LLC | 18,240 | $377.0K | 0.00% | +760+4.3% | Added |
| Weatherly Asset Management L. P. | 18,650 | $385.5K | 0.03% | +8,960+92.5% | Added |
| Mutual of America Capital Management LLC | 19,129 | $395.4K | 0.00% | +1,542+8.8% | Added |
| Virginia Retirement Systems Et Al | 19,400 | $401.0K | 0.00% | 00.0% | Unchanged |
| Lathrop Investment Management Corp | 19,526 | $404.0K | 0.07% | −518−2.6% | Reduced |
| Summit Trail Advisors, LLC | 20,229 | $418.1K | 0.01% | +6,267+44.9% | Added |
| Bank of Montreal | 20,485 | $423.4K | 0.00% | +519+2.6% | Added |
| Stephens Inc | 20,516 | $424.1K | 0.00% | −2,879−12.3% | Reduced |
| Guidance Capital, Inc | 20,853 | $433.1K | 0.09% | +1,382+7.1% | Added |
| Gryphon Financial Partners LLC | 21,057 | $435.2K | 0.04% | +2,174+11.5% | Added |
| Neville Rodie & Shaw Inc | 21,486 | $444.0K | 0.03% | −324−1.5% | Reduced |
| Grantham, Mayo, Van Otterloo & Co. LLC | 21,601 | $446.5K | 0.00% | +21,601 | New |
| Deutsche Bank AG | 21,821 | $451.0K | 0.00% | +1,967+9.9% | Added |
| Toroso Investments, LLC | 22,071 | $456.2K | 0.00% | +7,741+54.0% | Added |
| HSBC Holdings PLC | 22,218 | $460.1K | 0.00% | +22,218 | New |
| US Bancorp | 22,681 | $468.8K | 0.00% | −1,596−6.6% | Reduced |
| Security National Bank of Sioux City Iowa | 23,326 | $482.1K | 0.20% | +5,565+31.3% | Added |
| Pathstone Holdings, LLC | 23,947 | $495.0K | 0.00% | +2,153+9.9% | Added |
| Peak Asset Management, LLC | 24,000 | $496.1K | 0.07% | 00.0% | Unchanged |
| Feynman Point Asset Management LLC | 24,075 | $497.6K | 0.91% | +24,075 | New |
| Oppenheimer Asset Management Inc. | 24,597 | $508.4K | 0.01% | −3,557−12.6% | Reduced |
| Leavell Investment Management, Inc. | 24,660 | $509.7K | 0.02% | +8,023+48.2% | Added |
| Security National Bank of So Dak | 25,964 | $536.7K | 0.25% | −165−0.6% | Reduced |
| Sit Investment Associates Inc | 26,202 | $542.0K | 0.01% | 00.0% | Unchanged |
| Ameritas Advisory Services, LLC | 26,747 | $552.9K | 0.01% | +26,747 | New |
| National Philanthropic Trust | 26,844 | $554.9K | 0.01% | −222−0.8% | Reduced |
| Pictet Asset Management Holding SA | 26,893 | $555.9K | 0.00% | 00.0% | Unchanged |
| Blair William & Co | 27,278 | $563.8K | 0.00% | −22,020−44.7% | Reduced |
| Jain Global LLC | 27,519 | $568.8K | 0.01% | +27,519 | New |
| CI Private Wealth, LLC | 27,543 | $569.3K | 0.00% | −1,990−6.7% | Reduced |
| Group One Trading, L.P. | 27,710 | $572.8K | 0.02% | +27,710 | New |
| Legal Advantage Investments, Inc. | 28,900 | $597.4K | 0.21% | 00.0% | Unchanged |
| Maryland State Retirement & Pension System | 29,838 | $616.8K | 0.01% | 00.0% | Unchanged |
| Steadtrust LLC | 30,400 | $628.4K | 0.32% | −15,000−33.0% | Reduced |
| Blackstone Group Inc. | 31,027 | $641.3K | 0.00% | +31,027 | New |
| Dover Advisors, LLC | 22,219 | $644.4K | 0.26% | +1,058+5.0% | Added |
| Williams Jones Wealth Management, LLC. | 31,209 | $645.1K | 0.01% | −1,306−4.0% | Reduced |
| Marco Investment Management LLC | 31,391 | $648.9K | 0.04% | +31,391 | New |
| Citigroup Inc | 31,486 | $650.8K | 0.00% | −9,185−22.6% | Reduced |
| Clear Harbor Asset Management, LLC | 31,780 | $656.9K | 0.04% | −1,995−5.9% | Reduced |
| Neuberger Berman Group LLC | 32,120 | $663.9K | 0.00% | +11,569+56.3% | Added |
| Old West Investment Management, LLC | 32,875 | $679.5K | 0.07% | +11,108+51.0% | Added |
| Lebenthal Global Advisors, LLC | 33,000 | $682.1K | 0.09% | +33,000 | New |
| Tower Bridge Advisors | 33,261 | $687.5K | 0.06% | −2,437−6.8% | Reduced |
| Captrust Financial Advisors | 33,730 | $697.2K | 0.00% | +1,801+5.6% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 33,813 | $698.9K | 0.00% | −828−2.4% | Reduced |
| Nisa Investment Advisors, LLC | 34,922 | $721.8K | 0.00% | −1,307−3.6% | Reduced |
| Oregon Public Employees Retirement Fund | 35,000 | $723.5K | 0.01% | −100−0.3% | Reduced |
| Bryn Mawr Trust Co | 35,425 | $732.2K | 0.02% | +6,287+21.6% | Added |
| Axq Capital, LP | 35,915 | $742.4K | 0.08% | +35,915 | New |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 36,500 | $754.5K | 0.00% | −1,504−4.0% | Reduced |
| Yousif Capital Management, LLC | 37,746 | $780.2K | 0.01% | −106−0.3% | Reduced |
| Teachers Retirement System of the State of Kentucky | 37,772 | $781.0K | 0.01% | 00.0% | Unchanged |
| Dba Trading, LLC | 31,196 | $813.6K | 0.41% | 00.0% | Unchanged |
| Harbor Capital Advisors, Inc. | 39,501 | $816.0K | 0.06% | +39,501 | New |
| Vanguard Investments Australia, Ltd. | 39,488 | $816.2K | 0.00% | 00.0% | Unchanged |
| Lido Advisors, LLC | 40,309 | $833.2K | 0.00% | −10,036−19.9% | Reduced |
| Jones Financial Companies LLLP | 41,502 | $840.4K | 0.00% | +3,826+10.2% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 40,963 | $846.7K | 0.00% | 00.0% | Unchanged |