| 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 | 29 Jul 2025 | 0001472762 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CSGP | Common Stock, par value $0.01 per share | Sale | $188,764 | -2,033 | -7.3% | $92.85 | 25,771 | 28 Jul 2025 | Direct |