Real time insider trading transaction history:
- Insiders are prohibited from making short-swing profits by trading their shares within 6 months of the registration or acquiring the shares.
- 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>>
Common stock purchase or sale:
| Transaction Date | Reported DateTime | Company | Symbol | Insider Relationship | Shares Traded | Average Price | Total Amount | Shares Owned | Filing |
| 2026-03-06 Purchase | 2026-03-09 08:00 am | COSTAR GROUP INC. | CSGP | Sams Louise S Director | 1,000 | $48.36 | $48,360 | 20,409 (Direct) | View |
| 2026-03-02 Purchase | 2026-03-03 4:09 pm | COSTAR GROUP INC. | CSGP | Glaser Rachel C Director | 1,000 | $44.94 | $44,940 | 4,157 (Direct) | View |
| 2026-03-02 Purchase | 2026-03-03 4:09 pm | COSTAR GROUP INC. | CSGP | SAINT FREDERICK G. President, Marketplaces | 20,000 | $45.33 | $906,600 | 279,851 (Direct) | View |
| 2026-02-27 Purchase | 2026-03-02 4:00 pm | COSTAR GROUP INC. | CSGP | FLORANCE ANDREW C President and CEO | 55,720 | $44.52 | $2,480,654 | 1,586,866 (Direct) | View |
| 2026-02-19 Sale | 2026-02-23 5:18 pm | COSTAR GROUP INC. | CSGP | SIMURO FRANK Chief Technology Officer | 30,727 | $0 | $0 | 444,300 (Direct) | View |
| 2026-02-19 Sale | 2026-02-23 5:18 pm | COSTAR GROUP INC. | CSGP | SAINT FREDERICK G. President, Marketplaces | 17,583 | $0 | $0 | 270,947 (Direct) | View |
| 2026-02-19 Sale | 2026-02-23 5:18 pm | COSTAR GROUP INC. | CSGP | FLORANCE ANDREW C President and CEO | 104,983 | $0 | $0 | 1,531,146 (Direct) | View |
| 2026-02-19 Sale | 2026-02-23 5:17 pm | COSTAR GROUP INC. | CSGP | Ruggles Lisa Senior VP, Global Operations | 17,583 | $0 | $0 | 186,823 (Direct) | View |
| 2025-11-13 Sale | 2025-11-17 4:03 pm | COSTAR GROUP INC. | CSGP | Hill John W Director | 2,250 | $68.68 | $154,530 | 18,231 (Direct) | View |
| 2025-11-13 Sale | 2025-11-17 4:03 pm | COSTAR GROUP INC. | CSGP | Cann Cynthia Cammett Chief Accounting Officer | 1,841 | $68.79 | $126,642 | 23,211 (Direct) | View |
Stock options: Exercise, Award, Grant, Conversion
| Transaction Date | Reported DateTime | Exercisable Expiration | Company | Symnbol | Insider Relationship | Shares Traded | Conversion Price | Shares Owned | Filing |
| 2026-03-15 Tax Withholding(A) | 2026-03-17 5:47 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Boxer Gene General Counsel and Secretary | 482 | $43.63 | 95,463 (Direct) | View |
| 2026-03-15 Tax Withholding | 2026-03-17 4:12 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Ruggles Lisa Senior VP, Global Operations | 2,977 | $43.63 | 174,915 (Direct) | View |
| 2026-03-15 Tax Withholding | 2026-03-17 4:12 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Boxer Gene General Counsel and Secretary | 428 | $43.63 | 95,517 (Direct) | View |
| 2026-03-15 Tax Withholding | 2026-03-17 4:12 pm | N/A N/A | COSTAR GROUP INC. | CSGP | SIMURO FRANK Chief Technology Officer | 11,107 | $43.63 | 414,491 (Direct) | View |
| 2026-03-15 Tax Withholding | 2026-03-17 4:12 pm | N/A N/A | COSTAR GROUP INC. | CSGP | DESMARAIS MICHAEL J Chief Human Resources Officer | 2,873 | $43.63 | 87,725 (Direct) | View |
| 2026-03-15 Tax Withholding | 2026-03-17 4:12 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Cann Cynthia Cammett Chief Accounting Officer | 1,194 | $43.63 | 25,148 (Direct) | View |
| 2026-03-10 Option Award | 2026-03-11 5:18 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Cann Cynthia Cammett Chief Accounting Officer | 4,374 | $0 | 26,342 (Direct) | View |
| 2026-03-10 Option Award | 2026-03-11 5:18 pm | N/A N/A | COSTAR GROUP INC. | CSGP | FLORANCE ANDREW C President and CEO | 124,162 | $0 | 1,651,435 (Direct) | View |
| 2026-03-10 Option Award | 2026-03-11 5:18 pm | N/A N/A | COSTAR GROUP INC. | CSGP | LOWN CHRISTIAN M. Chief Financial Officer | 12,268 | $0 | 135,250 (Direct) | View |
| 2026-03-10 Option Award | 2026-03-11 5:18 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Boxer Gene General Counsel and Secretary | 21,920 | $0 | 95,945 (Direct) | View |
| 2026-03-10 Option Award | 2026-03-11 5:17 pm | N/A N/A | COSTAR GROUP INC. | CSGP | DESMARAIS MICHAEL J Chief Human Resources Officer | 17,676 | $0 | 90,598 (Direct) | View |
| 2026-03-01 Tax Withholding | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | LOWN CHRISTIAN M. Chief Financial Officer | 7,175 | $44.63 | 162,634 (Direct) | View |
| 2026-02-27 Option Award | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | LOWN CHRISTIAN M. Chief Financial Officer | 39,652 | $0 | 162,634 (Direct) | View |
| 2026-02-27 Option Award | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | SAINT FREDERICK G. President, Marketplaces | 39,652 | $0 | 39,652 (Direct) | View |
| 2026-03-01 Tax Withholding | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | FLORANCE ANDREW C President and CEO | 59,593 | $44.63 | 1,610,981 (Direct) | View |
| 2026-02-27 Option Award | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | FLORANCE ANDREW C President and CEO | 83,708 | $0 | 1,610,981 (Direct) | View |
| 2026-03-01 Tax Withholding | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Boxer Gene General Counsel and Secretary | 4,547 | $44.63 | 100,913 (Direct) | View |
| 2026-02-27 Option Award | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Boxer Gene General Counsel and Secretary | 26,888 | $0 | 100,913 (Direct) | View |
| 2026-03-01 Tax Withholding | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | DESMARAIS MICHAEL J Chief Human Resources Officer | 6,353 | $44.63 | 90,848 (Direct) | View |
| 2026-02-27 Option Award | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | DESMARAIS MICHAEL J Chief Human Resources Officer | 17,926 | $0 | 90,848 (Direct) | View |
| 2026-03-01 Tax Withholding | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Cann Cynthia Cammett Chief Accounting Officer | 1,385 | $44.63 | 28,802 (Direct) | View |
| 2026-02-27 Option Award | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Cann Cynthia Cammett Chief Accounting Officer | 6,834 | $0 | 28,802 (Direct) | View |
| 2026-03-01 Tax Withholding | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Ruggles Lisa Senior VP, Global Operations | 8,931 | $44.63 | 206,089 (Direct) | View |
| 2026-02-27 Option Award | 2026-03-03 7:06 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Ruggles Lisa Senior VP, Global Operations | 28,197 | $0 | 206,089 (Direct) | View |
| 2026-03-01 Tax Withholding | 2026-03-03 7:05 pm | N/A N/A | COSTAR GROUP INC. | CSGP | SIMURO FRANK Chief Technology Officer | 18,702 | $44.63 | 478,467 (Direct) | View |
| 2026-02-27 Option Award | 2026-03-03 7:05 pm | N/A N/A | COSTAR GROUP INC. | CSGP | SIMURO FRANK Chief Technology Officer | 52,869 | $0 | 478,467 (Direct) | View |
| 2026-03-01 Tax Withholding | 2026-03-03 4:09 pm | N/A N/A | COSTAR GROUP INC. | CSGP | SAINT FREDERICK G. President, Marketplaces | 11,096 | $44.63 | 279,851 (Direct) | View |
| 2026-02-19 Tax Withholding | 2026-02-23 5:18 pm | N/A N/A | COSTAR GROUP INC. | CSGP | SIMURO FRANK Chief Technology Officer | 4,421 | $49.07 | 444,300 (Direct) | View |
| 2026-02-19 Tax Withholding | 2026-02-23 5:18 pm | N/A N/A | COSTAR GROUP INC. | CSGP | SAINT FREDERICK G. President, Marketplaces | 2,149 | $49.07 | 270,947 (Direct) | View |
| 2026-02-19 Tax Withholding | 2026-02-23 5:18 pm | N/A N/A | COSTAR GROUP INC. | CSGP | FLORANCE ANDREW C President and CEO | 19,221 | $49.07 | 1,531,146 (Direct) | View |
| 2026-02-19 Tax Withholding | 2026-02-23 5:17 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Ruggles Lisa Senior VP, Global Operations | 3,219 | $49.07 | 186,823 (Direct) | View |
| 2026-02-15 Tax Withholding | 2026-02-18 4:05 pm | N/A N/A | COSTAR GROUP INC. | CSGP | SIMURO FRANK Chief Technology Officer | 4,151 | $44.99 | 479,448 (Direct) | View |
| 2026-02-15 Tax Withholding | 2026-02-18 4:05 pm | N/A N/A | COSTAR GROUP INC. | CSGP | FLORANCE ANDREW C President and CEO | 17,482 | $44.99 | 1,655,350 (Direct) | View |
| 2026-02-15 Tax Withholding | 2026-02-18 4:05 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Ruggles Lisa Senior VP, Global Operations | 3,576 | $44.99 | 207,625 (Direct) | View |
| 2026-02-15 Tax Withholding | 2026-02-18 4:05 pm | N/A N/A | COSTAR GROUP INC. | CSGP | SAINT FREDERICK G. President, Marketplaces | 2,424 | $44.99 | 290,679 (Direct) | View |
| 2025-09-09 Option Award | 2025-09-11 5:43 pm | N/A N/A | COSTAR GROUP INC. | CSGP | McCarthy Christine M Director | 2,973 | $0 | 2,973 (Direct) | View |
| 2025-09-09 Option Award | 2025-09-11 5:42 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Sams Louise S Director | 3,291 | $0 | 19,409 (Direct) | View |
| 2025-09-09 Option Award | 2025-09-11 5:42 pm | N/A N/A | COSTAR GROUP INC. | CSGP | BERISFORD JOHN L Director | 2,973 | $0 | 2,973 (Direct) | View |
| 2025-09-09 Option Award | 2025-09-11 5:41 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Hill John W Director | 3,177 | $0 | 20,481 (Direct) | View |
| 2025-09-09 Option Award | 2025-09-11 5:41 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Musslewhite Robert W Director | 3,121 | $0 | 18,277 (Direct) | View |
| 2025-09-09 Option Award | 2025-09-11 5:41 pm | N/A N/A | COSTAR GROUP INC. | CSGP | Glaser Rachel C Director | 3,143 | $0 | 3,143 (Direct) | View |