COSTAR GROUP, INC. — Director's Dealing 2015

Mar 13, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COSTAR GROUP INC (CSGP)
CIK: 0001057352
Period of Report: 2015-03-11

Reporting Person: Radecki Brian J (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-03-11	Common Stock, par value $0.01 per share	F	1374	$191.03	Disposed	41473	Direct
2015-03-13	Common Stock, par value $0.01 per share	M	4500	$102.16	Acquired	45973	Direct
2015-03-13	Common Stock, par value $0.01 per share	S	4500	$192.53	Disposed	41473	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-03-13	Option to Acquire Common Stock	$102.16	M	4500	Disposed	2023-03-10	Common Stock (4500.0)	Direct

Footnotes

F1: Represents all shares of Common Stock owned, consisting of 19,013 shares of Common Stock and 22,460 shares of Common Stock subject to unvested Restricted Stock grants.

F2: Represents all shares of Common Stock owned, consisting of 23,513 shares of Common Stock and 22,460 shares of Common Stock subject to unvested Restricted Stock grants.

F3: Average based on sales prices ranging from $192.50 to $192.63.

F4: The option vests in three equal installments on March 11, 2014, March 11, 2015, and March 11, 2016.