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"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>> |

| Transaction & Date | Reported Date |
Company | Symbol | Insider Relationship |
Shares Traded | Average Price | Total Amount |
Shares Ownership |
Filing |
| 2009-10-27- -2009-10-29 Sale |
2009-10-29 5:43 pm | COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 46,540 | $40.46 | $1,882,952 | 208,321 (Direct) | View |
| 2009-09-16 Sale | 2009-09-17 4:42 pm |
COSTAR GROUP INC | CSGP | Marples Paul (Managing Director, FOCUS) | 570 | $39.99 | $22,794 | 23,026 (Direct) |
View |
| 2007-08-09 Sale | 2007-08-09 4:05 pm | COSTAR GROUP INC | CSGP | CARCHEDI FRANCIS (Officer) | 11,250 | $58.04 | $652,950 | 38,477 (Direct) | View |
| Transaction & Date | Reported Date |
Company | Symbol | Insider Relationship | Shares Traded | Average Price |
Total Amount | Shares Ownership | Filing |
| 2009-10-27 Exercise |
2009-10-29 5:43 pm |
COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 34,940 | $20.58 | $719,202 | 241,921 (Direct) |
View |
| 2009-09-07- -2009-09-08 Tax Withholding |
2009-09-09 5:11 pm | COSTAR GROUP INC | CSGP | Radecki Brian J (Chief Financial Officer) | 184 | $37.3 | $6,863 | 25,431 (Direct) | View |
| 2009-09-07- -2009-09-08 Tax Withholding | 2009-09-09 5:08 pm |
COSTAR GROUP INC | CSGP | Stanfill John L (Sr. VP-Sales, Customer Service) | 128 | $37.32 | $4,777 | 50,570 (Direct) |
View |
| 2009-09-07- -2009-09-08 Tax Withholding |
2009-09-09 5:03 pm | COSTAR GROUP INC | CSGP | Kitchen Jennifer (Sr. Vice President, Research) | 190 | $37.28 | $7,082 | 10,986 (Direct) | View |
| 2009-05-28 Tax Withholding |
2009-06-01 5:00 pm |
COSTAR GROUP INC | CSGP | Marples Paul (Managing Director, FOCUS) | 41 | $35.92 | $1,473 | 23,596 (Direct) | View |
| 2009-05-28 Tax Withholding | 2009-06-01 4:59 pm | COSTAR GROUP INC | CSGP | Kitchen Jennifer (Sr. Vice President, Research) | 33 | $35.92 | $1,185 | 11,176 (Direct) |
View |
| 2009-05-15- -2009-05-29 Option Award Tax Withholding |
2009-06-01 4:57 pm | COSTAR GROUP INC | CSGP | Radecki Brian J (Chief Financial Officer) | 155 | $33.75 | $5,231 | 25,317 (Direct) |
View |
| 2009-05-28 Tax Withholding |
2009-06-01 4:55 pm |
COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 222 | $35.92 | $7,974 | 219,921 (Direct) |
View |
| 2009-04-27 Tax Withholding | 2009-04-28 7:03 pm | COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 1,055 | $35.81 | $37,780 | 220,143 (Direct) | View |
| 2009-04-17 Tax Withholding |
2009-04-21 11:27 am | COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 685 | $33.81 | $23,160 | 221,198 (Direct) |
View |
| 2009-03-10 Tax Withholding |
2009-03-11 5:12 pm |
COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 1,331 | $25.66 | $34,153 | 221,883 (Direct) | View |
| 2009-03-02 Option Award | 2009-03-04 6:03 pm | COSTAR GROUP INC | CSGP | Marples Paul (Managing Director, FOCUS) | 2,900 | $0 | $0 | 23,637 (Direct) |
View |
| 2009-03-02 Option Award | 2009-03-04 6:03 pm | COSTAR GROUP INC | CSGP | Kitchen Jennifer (Sr. Vice President, Research) | 3,300 | $0 | $0 | 11,209 (Direct) |
View |
| 2009-03-02 Option Award |
2009-03-04 6:03 pm |
COSTAR GROUP INC | CSGP | Stanfill John L (Sr. VP-Sales, Customer Service) | 2,900 | $0 | $0 | 50,698 (Direct) |
View |
| 2009-03-02 Option Award |
2009-03-04 6:02 pm | COSTAR GROUP INC | CSGP | Radecki Brian J (Chief Financial Officer) | 7,200 | $0 | $0 | 25,294 (Direct) | View |
| 2009-03-02 Option Award | 2009-03-04 6:02 pm | COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 21,400 | $0 | $0 | 223,214 (Direct) |
View |
| 2009-02-27 Tax Withholding |
2009-03-03 2:37 pm | COSTAR GROUP INC | CSGP | Kitchen Jennifer (Sr. Vice President, Research) | 277 | $25.5 | $7,064 | 7,909 (Direct) |
View |
| 2009-02-27 Tax Withholding | 2009-03-03 2:29 pm |
COSTAR GROUP INC | CSGP | Marples Paul (Managing Director, FOCUS) | 287 | $25.5 | $7,318 | 20,737 (Direct) | View |
| 2009-02-27 Tax Withholding |
2009-03-03 2:25 pm | COSTAR GROUP INC | CSGP | Radecki Brian J (Chief Financial Officer) | 555 | $25.5 | $14,152 | 18,094 (Direct) | View |
| 2009-02-27 Tax Withholding | 2009-03-03 2:19 pm |
COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 1,852 | $25.5 | $47,226 | 201,814 (Direct) | View |
| 2009-02-16 Tax Withholding | 2009-02-18 5:11 pm | COSTAR GROUP INC | CSGP | Marples Paul (Managing Director, FOCUS) | 1,025 | $28.65 | $29,366 | 21,024 (Direct) |
View |
| 2009-02-13 Tax Withholding | 2009-02-17 6:32 pm | COSTAR GROUP INC | CSGP | Stanfill John L (Sr. VP-Sales, Customer Service) | 991 | $29.55 | $29,284 | 47,798 (Direct) |
View |
| 2008-12-12 Tax Withholding |
2008-12-15 5:12 pm |
COSTAR GROUP INC | CSGP | Stanfill John L (Sr. VP-Sales, Customer Service) | 167 | $30.81 | $5,145 | 48,789 (Direct) |
View |
| 2008-12-06 Tax Withholding | 2008-12-09 5:40 pm |
COSTAR GROUP INC | CSGP | Stanfill John L (Sr. VP-Sales, Customer Service) | 83 | $29.25 | $2,428 | 48,956 (Direct) | View |
| 2008-09-08 Tax Withholding | 2008-09-09 5:28 pm | COSTAR GROUP INC | CSGP | Stanfill John L (Sr. VP-Sales, Customer Service) | 119 | $52.93 | $6,299 | 49,039 (Direct) | View |
| 2008-09-08 Tax Withholding | 2008-09-09 5:24 pm |
COSTAR GROUP INC | CSGP | Radecki Brian J (Chief Financial Officer) | 172 | $52.93 | $9,104 | 18,649 (Direct) | View |
| 2008-09-08 Tax Withholding |
2008-09-09 5:22 pm | COSTAR GROUP INC | CSGP | Kitchen Jennifer (Sr. Vice President, Research) | 177 | $52.93 | $9,369 | 8,186 (Direct) |
View |
| 2008-09-04 Option Award | 2008-09-04 8:27 pm |
COSTAR GROUP INC | CSGP | NASSETTA CHRISTOPHER J (Director) | 1,580 | $0 | $0 | 7,316 (Direct) | View |
| 2008-09-04 Option Award | 2008-09-04 8:25 pm | COSTAR GROUP INC | CSGP | Glosserman Michael J (Director) | 1,580 | $0 | $0 | 1,580 (Direct) | View |
| 2008-09-04 Option Award | 2008-09-04 8:24 pm | COSTAR GROUP INC | CSGP | LOW JOSIAH O III (Director) | 1,853 | $0 | $0 | 14,577 (Direct) | View |
| 2008-09-04 Option Award |
2008-09-04 8:23 pm | COSTAR GROUP INC | CSGP | HABER WARREN H (Director) | 1,853 | $0 | $0 | 85,887 (Direct) | View |
| 2008-09-04 Option Award |
2008-09-04 8:20 pm | COSTAR GROUP INC | CSGP | KLEIN MICHAEL R (Director) | 1,308 | $0 | $0 | 907,055 (Direct) |
View |
| 2008-09-04 Option Award | 2008-09-04 8:19 pm |
COSTAR GROUP INC | CSGP | BONDERMAN DAVID (Director) | 1,308 | $0 | $0 | 267,047 (Direct) |
View |
| 2008-05-28 Option Award | 2008-05-29 11:30 am | COSTAR GROUP INC | CSGP | Tully Christopher (Sr. VP-Sales, Customer Service) | 400 | $0 | $0 | 10,682 (Direct) |
View |
| 2007-09-14 Option Award | 2007-09-18 4:16 pm | COSTAR GROUP INC | CSGP | Reynolds Catherine B (Director) | 1,650 | $0 | $0 | 5,736 (Direct) | View |
| 2007-08-09 Exercise | 2007-08-09 4:05 pm |
COSTAR GROUP INC | CSGP | CARCHEDI FRANCIS (Officer) | 11,250 | $28.15 | $316,688 | 49,727 (Direct) | View |
| 2007-04-27 Tax Withholding |
2007-05-01 4:27 pm | COSTAR GROUP INC | CSGP | FARRINGTON CRAIG (Vice President, Research) | 174 | $49.12 | $8,547 | 6,307 (Direct) |
View |
| 2005-03-10 Option Award |
2005-03-14 5:09 pm |
COSTAR GROUP INC | CSGP | SCHAFFEL DAVID M (Chief Information Officer) | 3,308 | $0 | $0 | 3,308 (Direct) | View |
| Transaction & Date |
Reported Date | Exercisable Expiration | Company | Symbol | Insider Relationship | Shares Traded |
Conversion Price |
Shares Ownership |
Filing |
| 2009-10-27 Exercise | 2009-10-29 5:43 pm | N/A 2010-06-20 |
COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 12,940 | $24.88 | 0 (Direct) |
View |
| 2009-10-27 Exercise | 2009-10-29 5:43 pm |
N/A 2011-04-16 | COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 22,000 | $18.06 | 22,463 (Direct) | View |
| 2009-03-02 Option Award |
2009-03-04 6:03 pm |
N/A 2019-03-01 |
COSTAR GROUP INC | CSGP | Marples Paul (Managing Director, FOCUS) | 7,800 | $25 | 7,800 (Direct) |
View |
| 2009-03-02 Option Award | 2009-03-04 6:03 pm | N/A 2019-03-01 |
COSTAR GROUP INC | CSGP | Kitchen Jennifer (Sr. Vice President, Research) | 8,800 | $25 | 8,800 (Direct) | View |
| 2009-03-02 Option Award |
2009-03-04 6:03 pm | N/A 2019-03-01 | COSTAR GROUP INC | CSGP | Stanfill John L (Sr. VP-Sales, Customer Service) | 7,800 | $25 | 7,800 (Direct) |
View |
| 2009-03-02 Option Award |
2009-03-04 6:02 pm | N/A 2019-03-01 |
COSTAR GROUP INC | CSGP | Radecki Brian J (Chief Financial Officer) | 19,500 | $25 | 19,500 (Direct) | View |
| 2009-03-02 Option Award |
2009-03-04 6:02 pm | N/A 2019-03-01 | COSTAR GROUP INC | CSGP | FLORANCE ANDREW C (President and CEO Director) | 58,400 | $25 | 58,400 (Direct) | View |
| 2007-08-09 Exercise | 2007-08-09 4:05 pm | N/A 2013-09-22 | COSTAR GROUP INC | CSGP | CARCHEDI FRANCIS (Officer) | 11,250 | $28.15 | 3,750 (Direct) | View |
| 2004-02-27 Option Award | 2004-03-02 7:00 pm |
2005-02-27 2014-02-26 |
COSTAR GROUP INC | CSGP | ARABE MICHAEL D (Sen. VP- Sales & Cust. Service) | 12,500 | $39 | 77,500 (Direct) |
View |
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