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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
1066062	R Michael Klein	C/O Costar Group, Inc. 1331 L Street, Nw Washington DC 20005		Yes	No	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	2020-05-04	1,500	$0.00	246,414	No	5	G	Direct
Common Stock, Par Value $0.01 Per Share	Disposition	2020-05-06	3,639	$647.52	242,775	No	4	S	Direct
Common Stock, Par Value $0.01 Per Share	Disposition	2020-05-07	11,361	$636.51	231,414	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	5	G	Direct
No	4	S	Direct
No	4	S	Direct

Footnotes

Represents all shares of Common Stock owned, consisting of 245,146 shares of Common Stock and 1,268 shares of Common Stock subject to unvested Restricted Stock grants.
Average based on sales prices ranging from $643.54 to $651.11.
Represents all shares of Common Stock owned, consisting of 241,507 shares of Common Stock and 1,268 shares of Common Stock subject to unvested Restricted Stock grants.
Average based on sales prices ranging from $629.63 to $648.35.
Represents all shares of Common Stock owned, consisting of 230,146 shares of Common Stock and 1,268 shares of Common Stock subject to unvested Restricted Stock grants.