| 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 | 2025-07-29 | 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 | -$189K | -2.03K | -7.31% | $92.85 | 25.8K | Jul 28, 2025 | Direct |