Companies / Amentum Holdings, Inc. / Activity
Activity — Amentum Holdings, Inc.
136 moves.
Top impactInsider · CEO movesInsider · biggest buysInsider · biggest sellsInstitution · biggest movesInstitution · new positions
| Date | Actor | Action | Security | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Q1 2026 as of | Norges Bank 13F manager | Exit | Common stock | $-66.53M | -2.3M -100.00% | 0 | high |
| Q1 2026 as of | AQR Capital Management, LLC 13F manager | Trim | Common stock | $-24.49M | -944K -65.03% | 507,843 0.21% of shares | medium |
| Q4 2025 as of | Norges Bank 13F manager | Add | Common stock | $16.75M | +578K +33.65% | 2,294,097 0.94% of shares | medium |
| Q1 2026 as of | Millennium Management LLC 13F manager | Add | Common stock | $14.86M | +570K +931.35% | 631,055 0.26% of shares | medium |
| Q4 2025 as of | Bank of America Corp /De 13F manager | Add | Common stock | $10.41M | +359K +44.96% | 1,157,427 0.47% of shares | medium |
| Q2 2026 as of | BlackRock, Inc. 13F manager | Add | Common stock | $9.26M | +448K +2.57% | 17,906,984 7.32% of shares | medium |
| Q2 2026 as of | Mawer Investment Management Ltd. 13F manager | New | Common stock | $7.64M | +370K | 369,557 0.15% of shares | medium |
| Q1 2026 as of | Two Sigma Investments, LP 13F manager | Add | Common stock | $6.84M | +262K +41.10% | 900,177 0.37% of shares | medium |
| Q1 2026 as of | Balyasny Asset Management L.P. 13F manager | Trim | Common stock | $-6.51M | -250K -93.15% | 18,345 <0.01% of shares | medium |
| Q2 2026 as of | First National Bank of Omaha 13F manager | Add | Common stock | $6.09M | +298K +167.86% | 475,992 0.19% of shares | medium |
| Q4 2025 as of | First National Bank of Omaha 13F manager | New | Common stock | $5.21M | +178K | 177,700 0.07% of shares | medium |
| Q3 2024 as of | Barclays PLC 13F manager | New | Common stock | $5.15M | +160K | 159,813 0.07% of shares | medium |
| Q1 2026 as of | Wedge Capital Management L L P/NC 13F manager | New | Common stock | $4.29M | +165K | 164,666 0.07% of shares | low |
| Q1 2026 as of | Geode Capital Management, LLC 13F manager | Add | Common stock | $4.05M | +155K +5.83% | 2,814,415 1.15% of shares | low |
| Q1 2026 as of | First Trust Advisors LP 13F manager | Trim | Common stock | $-3.91M | -150K -39.63% | 228,083 0.09% of shares | low |
| Q1 2025 as of | Barclays PLC 13F manager | Trim | Common stock | $-2.08M | -114K -67.28% | 55,504 0.02% of shares | low |
| Q2 2026 as of | State Street Corporation 13F manager | Add | Common stock | $1.86M | +90K +1.78% | 5,151,772 2.11% of shares | low |
| Q1 2026 as of | D. E. Shaw & Co., Inc. 13F manager | New | Common stock | $1.73M | +66K | 66,171 0.03% of shares | low |
| Q1 2026 as of | Hotchkis and Wiley Capital Management, LLC 13F manager | Add | Common stock | $1.71M | +65K +24.38% | 333,800 0.14% of shares | low |
| Q4 2025 as of | Steadtrust LLC 13F manager | New | Common stock | $1.46M | +50K | 50,400 0.02% of shares | low |
| Q1 2026 as of | Mariner, LLC 13F manager | Exit | Common stock | $-1.42M | -49K -100.00% | 0 | low |
| Q1 2026 as of | Voya Investment Management LLC 13F manager | Add | Common stock | $1.36M | +52K +4.53% | 1,199,491 0.49% of shares | low |
| Q1 2026 as of | Penn Capital Management Company, LLC 13F manager | Trim | Common stock | $-1.30M | -50K -6.67% | 694,352 0.28% of shares | low |
| Q1 2026 as of | Gabelli Funds LLC 13F manager | Add | Common stock | $1.26M | +48K +226.27% | 69,783 0.03% of shares | low |
| Q2 2026 as of | Versor Investments LP 13F manager | Exit | Common stock | $-1.24M | -43K -100.00% | 0 | low |
| Q1 2026 as of | Capital Fund Management S.A. 13F manager | Exit | Common stock | $-1.07M | -37K -100.00% | 0 | low |
| Q1 2026 as of | Marshall Wace, LLP 13F manager | Exit | Common stock | $-1.02M | -35K -100.00% | 0 | low |
| Q1 2026 as of | Royal Bank of Canada 13F manager | Trim | Common stock | $-907.6K | -35K -13.06% | 231,742 0.09% of shares | low |
| Q1 2026 as of | California State Teachers Retirement System 13F manager | Add | Common stock | $903.5K | +35K +23.11% | 184,555 0.08% of shares | low |
| Q2 2026 as of | WINTON GROUP Ltd 13F manager | Trim | Common stock | $-890.0K | -43K -42.44% | 58,393 0.02% of shares | low |
| Q1 2026 as of | American Trust Investment Advisors, LLC 13F manager | Exit | Common stock | $-846.1K | -29K -100.00% | 0 | low |
| Q1 2026 as of | Advisors Asset Management, Inc. 13F manager | Add | Common stock | $755.0K | +29K +137.35% | 50,028 0.02% of shares | low |
| Q1 2026 as of | Walleye Trading LLC 13F manager | New | Common stock | $744.5K | +29K | 28,548 0.01% of shares | low |
| Q1 2026 as of | Oppenheimer Asset Management Inc. 13F manager | New | Common stock | $734.3K | +28K | 28,154 0.01% of shares | low |
| Q1 2026 as of | Wexford Capital LP 13F manager | Add | Common stock | $710.3K | +27K +330.08% | 35,486 0.01% of shares | low |
| Q2 2026 as of | AlphaQuest LLC 13F manager | Exit | Common stock | $-699.2K | -24K -100.00% | 0 | low |
| Q3 2025 as of | Pine Valley Investments Ltd Liability Co 13F manager | Add | Common stock | $696.4K | +29K +65.17% | 73,697 0.03% of shares | low |
| Q2 2026 as of | Lido Advisors, LLC 13F manager | Add | Common stock | $629.6K | +30K +309.27% | 40,309 0.02% of shares | low |
| Q1 2026 as of | Magnetar Financial LLC 13F manager | Exit | Common stock | $-605.4K | -21K -100.00% | 0 | low |
| Q1 2026 as of | CPPIB Crestone Peak Resources Canada Inc. 13F manager | Trim | Common stock | $-558.1K | -21K -64.86% | 11,594 <0.01% of shares | low |
| Q1 2026 as of | Double Black Diamond Offshore Ltd. 13F manager | Exit | Common stock | $-551.0K | -19K -100.00% | 0 | low |
| Q4 2025 as of | Oxford Asset Management LLP 13F manager | New | Common stock | $540.2K | +19K | 18,629 <0.01% of shares | low |
| Q1 2026 as of | Aristeia Capital, L.L.C. 13F manager | New | Common stock | $537.4K | +21K | 20,605 <0.01% of shares | low |
| Q1 2026 as of | Public Sector Pension Investment Board 13F manager | Add | Common stock | $501.5K | +19K +3.62% | 549,797 0.22% of shares | low |
| Q3 2024 as of | Chesapeake Asset Management LLC 13F manager | New | Common stock | $473.2K | +15K | 14,673 <0.01% of shares | low |
| Q1 2026 as of | Profund Advisors LLC 13F manager | Exit | Common stock | $-457.4K | -16K -100.00% | 0 | low |
| Q1 2026 as of | Principal Financial Group Inc 13F manager | Add | Common stock | $425.5K | +16K +2.24% | 744,728 0.30% of shares | low |
| Q1 2026 as of | Wolverine Asset Management, LLC 13F manager | Trim | Common stock | $-419.8K | -16K -23.66% | 51,942 0.02% of shares | low |
| Q1 2026 as of | Bank of New York Mellon Corp/The 13F manager | Trim | Common stock | $-352.0K | -13K -1.46% | 908,599 0.37% of shares | low |
| Q1 2026 as of | Grantham, Mayo, Van Otterloo & Co. LLC 13F manager | Exit | Common stock | $-303.3K | -10K -100.00% | 0 | low |