COSTAR GROUP INC (CSGP) Institutional Ownership and Insiders Activity

COSTAR GROUP INC (CSGP) is widely held by institutional investors, with 745 firms reporting positions valued at approximately $12.45B based on SEC Form 13F filings for the quarter ended June 30, 2026.

Vanguard Portfolio Management Llc is the largest disclosed holder, reporting approximately $1.07B in CSGP holdings in its latest filing.

Recent insider activity includes 6 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.