AMENTUM HOLDINGS INC (AMTM) Institutional Ownership and Insiders Activity

AMENTUM HOLDINGS INC (AMTM) is widely held by institutional investors, with 454 firms reporting positions valued at approximately $4.34B based on SEC Form 13F filings for the quarter ended June 30, 2026.

American Securities Llc is the largest disclosed holder, reporting approximately $930.70M in AMTM holdings in its latest filing.

Recent insider activity includes 1 tracked Form 4 transaction over the last three months, reflecting ongoing executive and director trading activity.