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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
Common Stock, Par Value $0.01 Per Share	Disposition	2013-11-20	2,000	$177.23	68,671	No	4	S	Direct
Common Stock, Par Value $0.01 Per Share	Disposition	2013-11-21	2,500	$180.91	66,171	No	4	S	Direct
Common Stock, Par Value $0.01 Per Share	Disposition	2013-11-22	4,000	$181.02	62,171	No	4	S	Direct

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

Footnotes

Average based on sales prices ranging from $177.18 to $177.29.
Represents all shares of Common Stock owned, consisting of 17,904 shares of Common Stock and 50,767 shares of Common Stock subject to unvested Restricted Stock Grants.
Average based on sales prices ranging from $180.55 to $181.10.
Represents all shares of Common Stock owned, consisting of 15,404 shares of Common Stock and 50,767 shares of Common Stock subject to unvested Restricted Stock Grants.
Average based on sales prices ranging from $181.00 to $181.20).
Represents all shares of Common Stock owned, consisting of 11,404 shares of Common Stock and 50,767 shares of Common Stock subject to unvested Restricted Stock Grants.