| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Glaser Rachel C | Director | C/O COSTAR GROUP, INC., 1201 WILSON BLVD., ARLINGTON | /s/ Gene Boxer, Attorney-in-Fact | 03 Mar 2026 | 0001497570 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CSGP | Common Stock, par value $0.01 per share | Purchase | $44,940 | +1,000 | +32% | $44.94 | 4,157 | 02 Mar 2026 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | This amount includes shares that were inadvertently omitted from the insider's prior filing. |
Exhibit 24 - Power of Attorney