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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
1412635	Paul Marples	C/O Costar Group, Inc. 1331 L Street, Nw Washington DC 20005	Managing Director, Focus	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	Disposition	2011-03-04	1,500	$57.25	15,902	No	4	S	Direct
Common Stock, Par Value $0.01 Per Share	Acquisiton	2011-03-04	2,500	$0.00	18,402	No	4	A	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Option to Acquire Common Stock	Acquisiton	2011-03-04	5,900	$0.00	5,900	$57.16

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
5,900		2021-03-03	No	4	A	Direct

Footnotes

Average based on sales prices ranging from $57.19 to $57.29.
Represents all shares of Common Stock owned, consisting of shares of 11,335 Common Stock and 4,567 shares of Common Stock subject to unvested Restricted Stock Grants.
Represents all shares of Common Stock owned, consisting of 11,335 shares of Common Stock and 7,067 shares of Common Stock subject to unvested Restricted Stock Grants.
The option vests in three equal installments on March 4, 2012, March 4, 2013, and March 4, 2014.