| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| LOWN CHRISTIAN M. | Chief Financial Officer | C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON | /s/ Gene Boxer, Attorney-in-Fact | 2025-07-02 | 0001701994 |
| 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 | -$375K | -4.67K | -3.46% | $80.40 | 130K | Jul 1, 2025 | Direct |