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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
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

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	2012-09-04	15,470	$82.45	65,223	No	4	F	Direct
Common Stock, Par Value $0.01 Per Share	Acquisiton	2012-09-06	15,000	$55.07	80,223	No	4	M	Direct
Common Stock, Par Value $0.01 Per Share	Disposition	2012-09-06	34,530	$81.84	45,693	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	F	Direct
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	2012-09-06	15,000	$0.00	15,000	$55.07

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2018-09-03	No	4	M	Direct

Footnotes

Represents all shares of Common Stock owned, consisting of 22,122 shares of Common Stock and 43,101 shares of Common Stock subject to unvested Restricted Stock Grants.
Represents all shares of Common Stock owned, consisting of 37,122 shares of Common Stock and 43,101 shares of Common Stock subject to unvested Restricted Stock Grants.
Average based on sales prices ranging from $81.34 to $82.56.
Represents all shares of Common Stock owned, consisting of 2,592 shares of Common Stock and 43,101 shares of Common Stock subject to unvested Restricted Stock Grants.
The option vested in three equal installments on September 4, 2009, September 4, 2010 and September 4, 2011.