| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| SAINT FREDERICK G. | President, Marketplaces | C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON | /s/ Gene Boxer, Attorney-in-Fact | 2025-08-05 | 0001500076 |
| 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 | -$137K | -1.44K | -0.45% | $95.19 | 318K | Aug 1, 2025 | Direct |