15 insiders reported 101 Form 4 transactions for COSTAR GROUP, INC. (CSGP) over the past 18 months (most recent 2026-07-06). Recent activity: LOWN CHRISTIAN M. (Chief Financial Officer) Sell 5,597 shares, McCarthy Christine M (Director) Buy 8,262 shares, Hill John W (Director) Buy 8,262 shares, Musslewhite Robert W (Director) Buy 8,262 shares, BERISFORD JOHN L (Director) Buy 8,262 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-07-06 | LOWN CHRISTIAN M. | Chief Financial Officer | Sell | 5,597 | $164,328 |
| 2026-06-24 | McCarthy Christine M | Director | Buy | 8,262 | $0 |
| 2026-06-24 | Hill John W | Director | Buy | 8,262 | $0 |
| 2026-06-24 | Musslewhite Robert W | Director | Buy | 8,262 | $0 |
| 2026-06-24 | BERISFORD JOHN L | Director | Buy | 8,262 | $0 |
| 2026-06-24 | Glaser Rachel C | Director | Buy | 8,262 | $0 |
| 2026-06-24 | Brunner Angelique G. | Director | Buy | 8,262 | $0 |
| 2026-06-24 | Sams Louise S | Director | Buy | 8,262 | $0 |
| 2026-06-16 | Cann Cynthia Cammett | Chief Accounting Officer | Sell | 461 | $14,770 |
| 2026-03-17 | Cann Cynthia Cammett | Chief Accounting Officer | Sell | 1,194 | $52,094 |
| 2026-03-17 | Ruggles Lisa | Senior VP, Global Operations | Sell | 2,977 | $129,887 |
| 2026-03-17 | Boxer Gene | General Counsel and Secretary | Sell | 428 | $18,674 |
| 2026-03-17 | Boxer Gene | General Counsel and Secretary | Sell | 482 | $21,030 |
| 2026-03-17 | DESMARAIS MICHAEL J | Chief Human Resources Officer | Sell | 2,873 | $125,349 |
| 2026-03-17 | SIMURO FRANK | Chief Technology Officer | Sell | 11,107 | $484,598 |
| 2026-03-11 | FLORANCE ANDREW C | President and CEO | Buy | 124,162 | $0 |
| 2026-03-11 | Boxer Gene | General Counsel and Secretary | Buy | 21,920 | $0 |
| 2026-03-11 | LOWN CHRISTIAN M. | Chief Financial Officer | Buy | 12,268 | $0 |
| 2026-03-11 | Cann Cynthia Cammett | Chief Accounting Officer | Buy | 4,374 | $0 |
| 2026-03-11 | DESMARAIS MICHAEL J | Chief Human Resources Officer | Buy | 17,676 | $0 |
| 2026-03-09 | Sams Louise S | Director | Buy | 1,000 | $48,360 |
| 2026-03-03 | Boxer Gene | General Counsel and Secretary | Sell | 4,547 | $202,933 |
| 2026-03-03 | FLORANCE ANDREW C | President and CEO | Sell | 59,593 | $2.7M |
| 2026-03-03 | SIMURO FRANK | Chief Technology Officer | Sell | 18,702 | $834,670 |
| 2026-03-03 | Glaser Rachel C | Director | Buy | 1,000 | $44,940 |
Source: SEC Form 4 filings · as of 2026-07-06