| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Ruggles Lisa | Senior VP, Global Operations | C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON | /s/ Gene Boxer, Attorney-in-Fact | 03 Jun 2025 | 0001717178 |
| 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 | $883 | -12 | -0.01% | $73.56 | 211,201 | 01 Jun 2025 | Direct |