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 |
|---|---|---|---|---|---|---|---|
| Q3 2024 as of | Ontario Teachers Pension Plan Board 13F manager | New | Common stock | $298.4K | +9K | 9,254 <0.01% of shares | low |
| Q4 2024 as of | Ontario Teachers Pension Plan Board 13F manager | Exit | Common stock | $-298.4K | -9K -100.00% | 0 | low |
| Q1 2026 as of | Hahn Capital Management LLC 13F manager | Trim | Common stock | $-282.8K | -11K -17.50% | 51,120 0.02% of shares | low |
| Q1 2026 as of | Guggenheim Capital LLC 13F manager | Exit | Common stock | $-273.7K | -9K -100.00% | 0 | low |
| Q1 2025 as of | Chesapeake Asset Management LLC 13F manager | Trim | Common stock | $-257.0K | -14K -96.25% | 550 <0.01% of shares | low |
| Q1 2026 as of | Avenir Corp 13F manager | Trim | Common stock | $-256.8K | -10K -1.16% | 841,099 0.34% of shares | low |
| Q1 2026 as of | Rhumbline Advisers 13F manager | Add | Common stock | $230.9K | +9K +3.04% | 300,293 0.12% of shares | low |
| Q1 2026 as of | Keybank National ASSOCIATION/OH 13F manager | Exit | Common stock | $-223.0K | -8K -100.00% | 0 | low |
| Q2 2026 as of | Alpine Woods Capital Investors, LLC 13F manager | Exit | Common stock | $-219.1K | -8K -100.00% | 0 | low |
| Q1 2026 as of | Alpine Woods Capital Investors, LLC 13F manager | New | Common stock | $219.1K | +8K | 8,402 <0.01% of shares | low |
| Q4 2024 as of | Barclays PLC 13F manager | Add | Common stock | $206.9K | +10K +6.16% | 169,651 0.07% of shares | low |
| Q2 2026 as of | LPL Financial LLC 13F manager | Add | Common stock | $201.6K | +10K +11.25% | 96,430 0.04% of shares | low |
| Q1 2026 as of | Zurcher Kantonalbank (Zurich Cantonalbank) 13F manager | Add | Common stock | $196.3K | +8K +22.50% | 40,963 0.02% of shares | low |
| Q2 2025 as of | Barclays PLC 13F manager | Trim | Common stock | $-147.9K | -6K -11.29% | 49,239 0.02% of shares | low |
| Q1 2026 as of | Ci Investments Inc. 13F manager | Trim | Common stock | $-142.4K | -5K -1.28% | 420,068 0.17% of shares | low |
| Q4 2025 as of | Danske Bank A/S 13F manager | New | Common stock | $114.9K | +4K | 3,962 <0.01% of shares | low |
| Q2 2025 as of | Pine Valley Investments Ltd Liability Co 13F manager | Add | Common stock | $113.3K | +5K +12.05% | 44,618 0.02% of shares | low |
| Q1 2026 as of | Evergreen Capital Management LLC 13F manager | Trim | Common stock | $-106.7K | -4K -31.01% | 9,103 <0.01% of shares | low |
| Q3 2025 as of | Barclays PLC 13F manager | Add | Common stock | $105.9K | +4K +8.98% | 53,662 0.02% of shares | low |
| Q4 2025 as of | Barclays PLC 13F manager | Trim | Common stock | $-95.3K | -3K -6.13% | 50,375 0.02% of shares | low |
| Q1 2026 as of | Sterling Capital Management LLC 13F manager | Trim | Common stock | $-82.7K | -3K -18.03% | 14,408 <0.01% of shares | low |
| Q1 2026 as of | Victory Capital Management, Inc. 13F manager | Add | Common stock | $73.8K | +3K +6.02% | 49,825 0.02% of shares | low |
| Q1 2026 as of | AllianceBernstein L.P. 13F manager | Add | Common stock | $73.5K | +3K +3.55% | 73,806 0.03% of shares | low |
| Q1 2026 as of | Peak6 LLC 13F manager | New | Common stock | $72.6K | +3K | 2,783 <0.01% of shares | low |
| Q4 2025 as of | Pine Valley Investments Ltd Liability Co 13F manager | Add | Common stock | $63.7K | +2K +2.98% | 75,894 0.03% of shares | low |
| Q1 2026 as of | MAI Capital Management 13F manager | Add | Common stock | $54.6K | +2K +52.31% | 6,094 <0.01% of shares | low |
| Q1 2026 as of | Prudential Financial Inc 13F manager | Trim | Common stock | $-52.0K | -2K -1.40% | 140,430 0.06% of shares | low |
| Q3 2025 as of | Leonteq Securities AG 13F manager | Trim | Common stock | $-47.9K | -2K -99.06% | 19 <0.01% of shares | low |
| Q2 2025 as of | Leonteq Securities AG 13F manager | Add | Common stock | $47.4K | +2K +15430.77% | 2,019 <0.01% of shares | low |
| Q1 2026 as of | Soros Fund Management LLC 13F manager | Trim | Common stock | $-44.3K | -2K -1.55% | 107,606 0.04% of shares | low |
| Q1 2026 as of | Tower Bridge Advisors 13F manager | Add | Common stock | $39.5K | +2K +4.44% | 35,698 0.01% of shares | low |
| Q1 2026 as of | Public Employees Retirement System of Ohio 13F manager | Trim | Common stock | $-36.3K | -1K -2.82% | 47,842 0.02% of shares | low |
| Q1 2026 as of | Nomura Asset Management Co Ltd 13F manager | Add | Common stock | $32.6K | +1K +86.34% | 2,700 <0.01% of shares | low |
| Q1 2026 as of | Bridgewater Associates, LP 13F manager | Trim | Common stock | $-31.3K | -1K -6.57% | 17,052 <0.01% of shares | low |
| Q1 2026 as of | BOK Financial Private Wealth, Inc. 13F manager | Trim | Common stock | $-20.5K | -786 -11.37% | 6,124 <0.01% of shares | low |
| Q2 2026 as of | Towarzystwo Funduszy Inwestycyjnych Pzu SA 13F manager | Add | Common stock | $20.3K | +980 +1849.06% | 1,033 <0.01% of shares | low |
| Q2 2026 as of | Victory Capital Management, Inc. 13F manager | Add | Common stock | $18.9K | +915 +1.84% | 50,740 0.02% of shares | low |
| Q3 2024 as of | Ransom Advisory, Ltd 13F manager | New | Common stock | $16.1K | +500 | 500 <0.01% of shares | low |
| Q1 2026 as of | Paragon Capital Management LLC 13F manager | Trim | Common stock | $-14.9K | -572 -1.31% | 43,158 0.02% of shares | low |
| Q1 2026 as of | Security National Bank of So Dak 13F manager | Trim | Common stock | $-13.4K | -513 -1.93% | 26,129 0.01% of shares | low |
| Q2 2026 as of | Deutsche Bank AG 13F manager | Add | Common stock | $13.4K | +646 +3.05% | 21,821 <0.01% of shares | low |
| Q2 2026 as of | The PNC Financial Services Group, Inc. 13F manager | Trim | Common stock | $-12.5K | -603 -4.78% | 12,020 <0.01% of shares | low |
| Q1 2026 as of | CIBC Global Asset Managment Inc. 13F manager | Trim | Common stock | $-11.8K | -451 -2.39% | 18,435 <0.01% of shares | low |
| Q2 2026 as of | Salomon & Ludwin, LLC 13F manager | Add | Common stock | $11.4K | +563 +43.14% | 1,868 <0.01% of shares | low |
| Q1 2026 as of | Thompson Siegel & Walmsley LLC 13F manager | Trim | Common stock | $-10.3K | -396K -20.60% | 1,525,884 0.62% of shares | low |
| Q2 2026 as of | Pinnacle Wealth Planning Services, Inc. 13F manager | Trim | Common stock | $-9.3K | -452 -18.96% | 1,932 <0.01% of shares | low |
| Q2 2026 as of | Quent Capital, LLC 13F manager | Trim | Common stock | $-8.9K | -429 -50.00% | 429 <0.01% of shares | low |
| Q4 2025 as of | Chesapeake Asset Management LLC 13F manager | Trim | Common stock | $-5.2K | -181 -32.91% | 369 <0.01% of shares | low |
| Q1 2026 as of | Private Trust Co NA 13F manager | Trim | Common stock | $-4.7K | -181 -31.98% | 385 <0.01% of shares | low |
| Q1 2026 as of | Clifford Swan Investment Counsel LLC 13F manager | Trim | Common stock | $-3.7K | -140 -0.72% | 19,214 <0.01% of shares | low |