898 institutions reported holding $11.91B of COSTAR GROUP INC (CSGP) in SEC 13F filings for 2026-06-30. Largest institutional holders: VANGUARD GROUP INC ($1.95B), BlackRock, Inc. ($957.6M), BAMCO INC /NY/ ($612.5M), STATE STREET CORP ($521.4M), Capital International Investors ($471.3M). Source: SEC Form 13F.
Source: SEC Form 13F filings · as of 2026-06-30