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Filing Details

Accession Number:: 0001057352-12-000088
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2012-05-08 16:33:27
Reporting Period:: 2012-05-04

Filing Date:: 2012-05-08
Accepted Time:: 2012-05-08 16:33:27
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1057352	Costar Group Inc	CSGP	Services-Business Services, Nec (7389)	522091509

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1438487	L John Stanfill	C/O Costar Group, Inc. 1331 L Street, Nw Washington DC 20005	Sr. Vp-Sales, Customer Service	No	Yes	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock, Par Value $0.01 Per Share	Disposition	2012-05-04	8,000	$70.57	80,693	No	4	S	Direct
Common Stock, Par Value $0.01 Per Share	Acquisiton	2012-05-07	750	$19.71	81,443	No	4	M	Direct
Common Stock, Par Value $0.01 Per Share	Acquisiton	2012-05-07	2,602	$25.00	84,045	No	4	M	Direct
Common Stock, Par Value $0.01 Per Share	Acquisiton	2012-05-07	4,600	$42.29	88,645	No	4	M	Direct
Common Stock, Par Value $0.01 Per Share	Acquisiton	2012-05-07	3,900	$57.16	92,545	No	4	M	Direct
Common Stock, Par Value $0.01 Per Share	Disposition	2012-05-07	11,852	$70.13	80,693	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Option to Acquire Common Stock	Disposition	2012-05-07	750	$0.00	750	$19.71
Common Stock	Option to Acquire Common Stock	Disposition	2012-05-07	2,602	$0.00	2,602	$25.00
Common Stock	Option to Acquire Common Stock	Disposition	2012-05-07	4,600	$0.00	4,600	$42.29
Common Stock	Option to Acquire Common Stock	Disposition	2012-05-07	3,900	$0.00	3,900	$57.16

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2012-08-05	No	4	M	Direct
0	2019-03-01	No	4	M	Direct
2,300	2020-03-11	No	4	M	Direct
7,800	2021-03-03	No	4	M	Direct

Footnotes

Average based on sales prices ranging from $70.40 to $70.65.
Represents all shares of Common Stock owned, consisting of 2,592 shares of Common Stock and 78,101 shares of Common Stock subject to unvested Restricted Stock Grants.
Represents all shares of Common Stock owned, consisting of 3,342 shares of Common Stock and 78,101 shares of Common Stock subject to unvested Restricted Stock Grants.
Represents all shares of Common Stock owned, consisting of 5,944 shares of Common Stock and 78,101 shares of Common Stock subject to unvested Restricted Stock Grants.
Represents all shares of Common Stock owned, consisting of 10,544 shares of Common Stock and 78,101 shares of Common Stock subject to unvested Restricted Stock Grants.
Represents all shares of Common Stock owned, consisting of 14,444 shares of Common Stock and 78,101 shares of Common Stock subject to unvested Restricted Stock Grants.
Average based on sales prices ranging from $69.94 to $70.39.
Represents all shares of Common Stock owned, consisting of 2,592 shares of Common Stock and 78,101 shares of Common Stock subject to unvested Restricted Stock Grants.
The option vested in four equal installments on August 6, 2003, August 6, 2004, August 6, 2005 and August 6, 2006.
The option vested in three equal installments on March 2, 2010, March 2, 2011 and March 2, 2012.
The option vests in three equal installments on March 12, 2011, March 2, 2012 and March 2, 2013.
The option vests in three equal installments on March 4, 2012, March 4, 2013 and March 4, 2014.