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Filing Details

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
1402193	J Brian Radecki	C/O Costar Group, Inc. 1331 L Street, Nw Washington DC 20005	Chief Financial Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.01 Per Share	Acquisiton	2012-05-11	60	$39.81	71,521	No	4	M	Direct
Common Stock, Par Value $0.01 Per Share	Disposition	2012-05-11	60	$70.50	71,461	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Option to Acquire Common Stock	Disposition	2012-05-11	60	$0.00	60	$39.81

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2014-02-05	No	4	M	Direct

Footnotes

Represents all shares of Common Stock owned, consisting of 21,053 shares of Common Stock and 50,468 shares of Common Stock subject to unvested Restricted Stock Grants.
Represents all shares of Common Stock owned, consisting of 20,993 shares of Common Stock and 50,468 shares of Common Stock subject to unvested Restricted Stock Grants.
The option vested in four equal installments on February 6, 2005, February 6, 2006, February 6, 2007 and February 6, 2008.