| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Cann Cynthia Cammett | Chief Accounting Officer | C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON | /s/ Gene Boxer, Attorney-in-Fact | 2025-06-17 | 0001472762 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CSGP | Common Stock, par value $0.01 per share | Tax liability | -$37.4K | -461 | -1.63% | $81.16 | 27.8K | Jun 15, 2025 | Direct |