CSGP: CoStar Group, Inc. insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 0 sales totaling - in the last 180 days.
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-08-14 | New 13G stake | BAMCO INC /NY/ | 5.30% | SEC |
Institutional ownership (Q2 2026)
762 institutions reported holding $11.59B of CoStar Group, Inc. on Form 13F (798 the quarter before). 108 opened a new position and 143 sold out. Shares held by institutions: same.
| Largest holders | Shares | Value |
|---|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC | 37,914,844 | $1.07B |
| BlackRock, Inc. | 33,813,969 | $957.61M |
| VANGUARD CAPITAL MANAGEMENT LLC | 26,683,792 | $755.68M |
| BAMCO INC /NY/ | 21,626,763 | $612.47M |
| STATE STREET CORP | 18,410,876 | $521.40M |
| Capital International Investors | 16,643,016 | $471.33M |
| BAILLIE GIFFORD & CO | 13,154,165 | $372.53M |
| GEODE CAPITAL MANAGEMENT, LLC | 12,166,469 | $343.30M |
| AKRE CAPITAL MANAGEMENT LLC | 11,699,396 | $331.33M |
| POLEN CAPITAL MANAGEMENT LLC | 8,759,314 | $248.06M |
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