List of insiders holdings for COSTAR GROUP INC.:
- Shares directly owned by the insider.
- Shares indirectly owned by the insider.
- Total shares owned by the insider (sum of shares directly and indirectly owned).
- Total market value if available.
- Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
| # | Insider Holder Name | Report Date Time | Shares Owned Directly Indirectly | Total Shares Owned | Filing |
| 1 | KLEIN MICHAEL R Director | 2024-12-12 16:16:17 | 1,848,592 0 | 1,848,592 | Form 4 |
| 2 | FLORANCE ANDREW C President and CEO | 2025-03-07 18:06:21 | 1,672,832 0 | 1,672,832 | Form 4 |
| 3 | SIMURO FRANK Chief Technology Officer | 2025-03-18 20:33:47 | 483,599 0 | 483,599 | Form 4 |
| 4 | SAINT FREDERICK G. President, Marketplaces | 2025-06-12 16:36:34 | 344,539 0 | 344,539 | Form 4 |
| 5 | Wheeler Scott T Chief Financial Officer | 2024-04-30 16:13:35 | 328,651 5,701 | 334,352 | Form 4 |
| 6 | BONDERMAN DAVID Director | 2014-09-15 17:41:07 | 294,277 0 | 294,277 | Form 4 |
| 7 | NASSETTA CHRISTOPHER J Director | 2024-12-02 16:55:38 | 229,715 46,000 | 275,715 | Form 4 |
| 8 | Ruggles Lisa Senior VP, Global Operations | 2025-06-03 16:30:31 | 211,201 0 | 211,201 | Form 4 |
| 9 | LOWN CHRISTIAN M. Chief Financial Officer | 2025-07-02 17:20:38 | 130,157 0 | 130,157 | Form 4 |
| 10 | HABER WARREN H Director | 2018-09-24 16:28:08 | 121,049 0 | 121,049 | Form 4 |
| 11 | Glosserman Michael J Director | 2023-11-01 16:13:10 | 101,465 0 | 101,465 | Form 4 |
| 12 | ARABE MICHAEL D Sen. VP- Sales & Cust. Service | 2004-03-02 19:00:38 | 89,912 1,500 | 91,412 | Form 4 |
| 13 | DESMARAIS MICHAEL J Chief Human Resources Officer | 2025-03-18 20:33:58 | 79,118 0 | 79,118 | Form 4 |
| 14 | Boxer Gene General Counsel and Secretary | 2025-03-18 20:34:08 | 78,572 0 | 78,572 | Form 4 |
| 15 | Radecki Brian J Chief Financial Officer | 2015-03-13 17:07:54 | 45,973 0 | 45,973 | Form 4 |
| 16 | SCHAFFEL DAVID M Chief Information Officer | 2005-03-14 17:09:59 | 28,635 0 | 28,635 | Form 4 |
| 17 | Marples Paul Managing Director, CoStar UK Director | 2012-08-01 17:35:24 | 28,632 0 | 28,632 | Form 4 |
| 18 | Cann Cynthia Cammett Chief Accounting Officer | 2025-06-17 18:08:45 | 27,804 0 | 27,804 | Form 4 |
| 19 | Kitchen Jennifer Sr. Vice President, Research | 2013-09-11 16:55:40 | 22,220 0 | 22,220 | Form 4 |
| 20 | LOW JOSIAH O III Director | 2010-09-07 16:45:43 | 20,705 0 | 20,705 | Form 4 |
| 21 | Stanfill John L Sr. VP-Sales, Customer Service | 2014-03-12 17:50:06 | 20,105 0 | 20,105 | Form 4 |
| 22 | Linnington Matthew Executive VP, Sales | 2020-08-13 16:31:31 | 19,766 0 | 19,766 | Form 4 |
| 23 | Kaplan Laura Cox Director | 2024-08-05 16:13:30 | 17,835 0 | 17,835 | Form 4 |
| 24 | Hill John W Director | 2024-12-12 16:16:28 | 17,304 0 | 17,304 | Form 4 |
| 25 | Sams Louise S Director | 2024-08-05 16:13:51 | 16,118 0 | 16,118 | Form 4 |
| 26 | Musslewhite Robert W Director | 2024-08-05 16:13:41 | 15,156 0 | 15,156 | Form 4 |
| 27 | Tully Christopher Sr. VP-Sales, Customer Service | 2008-05-29 11:30:46 | 10,682 0 | 10,682 | Form 4 |
| 28 | Brunner Angelique G. Director | 2024-08-05 16:14:01 | 7,023 0 | 7,023 | Form 4 |
| 29 | CARCHEDI FRANCIS Executive VP, Corp. Dev. | 2018-10-02 16:17:56 | 6,540 0 | 6,540 | Form 4 |
| 30 | Steinberg David Jay Director | 2020-03-05 16:46:36 | 6,456 0 | 6,456 | Form 4 |
| 31 | FARRINGTON CRAIG Vice President, Research | 2007-05-01 16:27:06 | 6,307 0 | 6,307 | Form 4 |
| 32 | Reynolds Catherine B Director | 2007-09-18 16:16:44 | 5,736 0 | 5,736 | Form 4 |
| 33 | Yinger Scott L Interim CFO | 2015-08-11 17:23:23 | 4,583 0 | 4,583 | Form 3 |
| 34 | Glaser Rachel C Director | 2025-04-14 16:15:06 | 0 0 | 0 | Form 3 |
| 35 | BERISFORD JOHN L Director | 2025-04-14 16:15:07 | 0 0 | 0 | Form 3 |
| 36 | McCarthy Christine M Director | 2025-04-14 16:15:04 | 0 0 | 0 | Form 3 |