365 institutions reported holding $2.56B of ATKORE (ATKR) in SEC 13F filings for 2026-06-30. Largest institutional holders: VANGUARD GROUP INC ($298.3M), BlackRock, Inc. ($237.0M), AMERICAN CENTURY COMPANIES INC ($135.0M), Gates Capital Management, Inc. ($130.0M), DIMENSIONAL FUND ADVISORS LP ($98.8M). Source: SEC Form 13F.
Source: SEC Form 13F filings · as of 2026-06-30