CoStar Group Inc (CSGP)
Real Estate
Real Estate Services
28.80 $
-2.4%
vs. previous close
Closing price · As of: 31. Jul 2026
Who owns CoStar Group Inc (CSGP)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 98.6% of the shares are freely tradable; institutional investors hold 104.1%.
Ownership Structure
Institutional ownership
Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
104.1%
Insiders
Share of the stock held by the executives, founders and major shareholders of the company itself.
1.2%
Float
Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
98.6%
Short % of float
Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
4.0%
Shares Outstanding
Total number of shares issued. Price times share count gives market cap.
405Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Portfolio Management, LLC | 9.44 | 38,234,133 | +0.0 | 03/31/2026 |
| BlackRock Inc | 8.34 | 33,808,184 | -0.5 | 03/31/2026 |
| Vanguard Capital Management, LLC | 6.77 | 27,423,903 | +0.0 | 03/31/2026 |
| State Street Corp | 4.60 | 18,650,975 | +0.1 | 03/31/2026 |
| Principal Financial Group Inc | 4.37 | 17,696,192 | +0.7 | 03/31/2026 |
| BAMCO Inc | 4.03 | 16,314,175 | -16.3 | 03/31/2026 |
| Amvescap Plc. | 3.94 | 15,947,525 | +7.0 | 03/31/2026 |
| Capital Research & Mgmt Co - Division 3 | 3.83 | 15,513,753 | +43.1 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Real Estate Index Investor | 3.89 | 15,904,101 | +1.6 | 06/30/2026 |
| Baron Partners Retail | 3.79 | 15,488,217 | +113.6 | 06/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.