| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| SIMURO FRANK | Chief Technology Officer | C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON | /s/ Gene Boxer, Attorney-in-Fact | 17 Mar 2026 | 0001925960 |
| 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 | -11,107 | -2.6% | $43.63* | 414,491 | 15 Mar 2026 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63. |