CSGP COSTAR GROUP, INC.: institutional ownership and insider trading
810 funds reported holding $17.8B of COSTAR GROUP, INC. in their latest 13F filings; in Q2 2026 funds net bought $174M, with 109 new positions and 142 funds selling out; over the last 12 months insiders bought $8.48M and sold $534K on the open market.
Famous investors holding CSGP
- Chuck Akre (Akre Capital Management): $331M, 6.5% of the portfolio
- Two Sigma (Two Sigma Investments): $34.0M, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $29.5M, 0.0% of the portfolio
- Izzy Englander (Millennium Management): $24.7M, 0.0% of the portfolio
- Ken Griffin (Citadel Advisors): $35.1M, 0.0% of the portfolio
Largest institutional holders of CSGP
- VANGUARD GROUP INC — $4.71B
- VANGUARD PORTFOLIO MANAGEMENT LLC — $1.07B
- BlackRock, Inc. (BLK) — $958M
- VANGUARD CAPITAL MANAGEMENT LLC — $756M
- BAMCO INC /NY/ — $612M
- Banque Cantonale Vaudoise — $554M
- STATE STREET CORP (STT, STT-PG) — $521M
- Capital International Investors — $471M
- BAILLIE GIFFORD & CO — $373M
- GEODE CAPITAL MANAGEMENT, LLC — $343M
Recent CSGP insider trades
- Aug 7, 2026: Cann Cynthia Cammett sold 4,788 shares ($147K)
- Aug 5, 2026: Hill John W sold 3,500 shares ($106K)
- Aug 4, 2026: Florance Andrew C bought 83,300 shares ($2.49M)
- May 1, 2026: Florance Andrew C bought 71,430 shares ($2.51M)
Members of Congress trading CSGP
- Aug 19, 2026: Gilbert Ray Cisneros, Jr. bought $1.00K–$15.0K
- Apr 14, 2026: Gilbert Ray Cisneros, Jr. sold part of $1.00K–$15.0K
- Mar 13, 2026: Gilbert Ray Cisneros, Jr. bought $1.00K–$15.0K
- Jan 28, 2026: Gilbert Ray Cisneros, Jr. bought $1.00K–$15.0K
- Dec 10, 2025: Gilbert Ray Cisneros, Jr. bought $1.00K–$15.0K
- Oct 15, 2025: Gilbert Ray Cisneros, Jr. bought $1.00K–$15.0K
- Sep 30, 2025: Gilbert Ray Cisneros, Jr. bought $1.00K–$15.0K
- Sep 25, 2025: Lisa C. McClain sold $1.00K–$15.0K
- Sep 22, 2025: Gilbert Ray Cisneros, Jr. bought $1.00K–$15.0K
- Aug 13, 2025: Lisa C. McClain bought $1.00K–$15.0K
5%+ owners
- Vanguard Portfolio Management: 9.1% (Schedule 13G, filed Apr 29, 2026)
- Vanguard Capital Management: 7.5% (Schedule 13G, filed Apr 29, 2026)
- Baron Capital Group, Inc.: 5.3% (Schedule 13G, filed Aug 14, 2026)