AMTM Amentum Holdings, Inc.: institutional ownership and insider trading
500 funds reported holding $4.84B of Amentum Holdings, Inc. in their latest 13F filings; in Q2 2026 funds net bought $127M, with 52 new positions and 74 funds selling out; over the last 12 months insiders bought $0 and sold $0 on the open market.
Famous investors holding AMTM
- Sequoia Fund (Ruane, Cunniff & Goldfarb): $11.1M, 0.2% of the portfolio
- George Soros (Soros Fund Management): $2.44M, 0.0% of the portfolio
- Izzy Englander (Millennium Management): $44.0M, 0.0% of the portfolio
- Ken Griffin (Citadel Advisors): $20.1M, 0.0% of the portfolio
- Two Sigma (Two Sigma Investments): $5.88M, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $3.96M, 0.0% of the portfolio
- Ray Dalio (Bridgewater Associates): $976K, 0.0% of the portfolio
Largest institutional holders of AMTM
- AMERICAN SECURITIES LLC — $931M
- Invesco Ltd. (IVZ) — $516M
- VANGUARD GROUP INC — $447M
- BlackRock, Inc. (BLK) — $370M
- PRIMECAP MANAGEMENT CO/CA/ — $254M
- VANGUARD PORTFOLIO MANAGEMENT LLC — $164M
- VANGUARD CAPITAL MANAGEMENT LLC — $139M
- FMR LLC — $117M
- DIMENSIONAL FUND ADVISORS LP — $114M
- STATE STREET CORP (STT, STT-PG) — $106M
Recent AMTM insider trades
- Feb 18, 2025: Loughran Barbara bought 4,600 shares ($97.7K)
- Feb 12, 2025: Demetriou Steven J. bought 100,000 shares ($2.08M)
Members of Congress trading AMTM
- Oct 31, 2024: William R. Keating sold $1.00K–$15.0K
- Sep 30, 2024: Thomas H. Kean, Jr. exchanged $1.00K–$15.0K
- Sep 30, 2024: Thomas H. Kean, Jr. exchanged $1.00K–$15.0K
- Sep 30, 2024: Thomas H. Kean, Jr. exchanged $1.00K–$15.0K
- Sep 30, 2024: Thomas H. Kean, Jr. exchanged $1.00K–$15.0K
5%+ owners
- Invesco Ltd.: 10.1% (Schedule 13G/A, filed May 7, 2026)
- PRIMECAP MANAGEMENT CO/CA/: 5.0% (Schedule 13G, filed Aug 6, 2026)