| 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 | 02 Sep 2025 | 0001500076 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CSGP | Common Stock, par value $0.01 per share | Sale | $2,258,250 | -25,000 | -7.9% | $90.33 | 293,103 | 28 Aug 2025 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | Average based on sales prices ranging from $90.30 to $90.38. |