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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
1066061	C Andrew Florance	C/O Costar Group, Inc. 1331 L Street, Nw Washington DC 20005	President And Ceo	Yes	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	2018-04-26	7,782	$372.34	136,870	No	4	S	Direct
Common Stock, Par Value $0.01 Per Share	Disposition	2018-04-27	11,200	$371.15	125,670	No	4	S	Direct
Common Stock, Par Value $0.01 Per Share	Disposition	2018-04-30	5,839	$369.05	119,831	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 $372.25 to $372.56.
Represents all shares of Common Stock owned, consisting of 70,682 shares of Common Stock and 66,188 shares of Common Stock subject to unvested Restricted Stock grants.
Average based on sales prices ranging from $371 to $371.23.
Represents all shares of Common Stock owned, consisting of 59,482 shares of Common Stock and 66,188 shares of Common Stock subject to unvested Restricted Stock grants.
Average based on sales prices ranging from $369 to $369.61.
Represents all shares of Common Stock owned, consisting of 53,643 shares of Common Stock and 66,188 shares of Common Stock subject to unvested Restricted Stock grants.