Supply breakdown
Shares as of Oct 26, 2026| Category | Shares | % | Value | Status |
|---|---|---|---|---|
| Circulating | 402.34M | 100.0% | $11.39B | Estimated |
| Free float | - | - | - | Unavailable |
| Insider-held, unrestricted | - | - | - | Unavailable |
| Locked team funds | - | - | - | Unavailable |
| Other restricted (unlisted classes only) | - | - | - | Unavailable |
| Total outstanding | 402.34M | 100.0% | $11.39B | Verified |
| Ownership views (overlap the categories above, never added) | ||||
| Institutional holdings (13F; over 100%, double counted) | 413.86M | 102.9% | $11.72B | Estimated |
| Insider-held, all (Forms 3, 4, 5) | - | - | - | Unavailable |
Institutional and insider holdings can include both tradable and locked shares, so they are shown for reference and never added to the total. Check: no class has more shares deducted than it has outstanding, and the review found no shares that may be counted twice: reconciles.
Valuation
- Traditional$11.39B
- Fully diluted$11.40B
- Circulating$11.39B
- Free float-
- Locked team value$0
- Other restricted value$0
Locked and restricted shares
Not reviewed yet.
Institutional holders
13F, quarter ended Jun 30, 2026| Holder | Shares | % of total |
|---|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC | 37.91M | 9.42% |
| BlackRock, Inc. | 33.81M | 8.40% |
| VANGUARD CAPITAL MANAGEMENT LLC | 26.68M | 6.63% |
| BAMCO INC /NY/ | 21.63M | 5.38% |
| STATE STREET CORP | 18.41M | 4.58% |
| Capital International Investors | 16.64M | 4.14% |
| BAILLIE GIFFORD & CO | 13.15M | 3.27% |
| GEODE CAPITAL MANAGEMENT, LLC | 12.17M | 3.02% |
| AKRE CAPITAL MANAGEMENT LLC | 11.70M | 2.91% |
| POLEN CAPITAL MANAGEMENT LLC | 8.76M | 2.18% |
Sum of long share positions in Form 13F reports for the quarter. 13F covers managers with over $100M in US equities; some positions are reported by more than one filer. The total is 103% of shares outstanding, so it counts some shares twice: positions reported by more than one manager, and lent shares that appear at both the lender and the buyer. Read it as an upper bound.
Insiders
Forms 3, 4 and 5Form 4 aggregation pending
Share classes
| Class | Listing | Shares outstanding | As of |
|---|---|---|---|
| Common stock | CSGP on Nasdaq | 402,337,328 | Oct 26, 2026 |
Notes and sources
- COSTAR GROUP, INC. 10-Q for period ended 2026-09-30, Cover page (0001057352-26-000083)
- SEC public float (non-affiliates): $33.90B as of Jun 30, 2025, from the 10-K cover. It is a dollar value at a past date, not circulating supply.