COSTAR GROUP, INC. — Director's Dealing 2014

Mar 4, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COSTAR GROUP INC (CSGP)
CIK: 0001057352
Period of Report: 2014-02-28

Reporting Person: Radecki Brian J (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-02-28	Common Stock, par value $0.01 per share	F	17105	$201.04	Disposed	43706	Direct
2014-02-28	Common Stock, par value $0.01 per share	A	8220	—	Acquired	51926	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-02-28	Option to Acquire Common Stock	$201.04	A	11100	Acquired	2024-02-27	Common Stock (11100)	Direct

Footnotes

F1: Represents all shares of Common Stock owned, consisting of 30,339 shares of Common Stock and 13,367 shares of Common Stock subject to unvested Restricted Stock Grants.

F2: Includes a grant of 5,100 shares of restricted common stock that vest in three equal installments on February 28, 2015, February 28, 2016, and February 28, 2017, and a grant of 3,120 shares of restricted common stock that vest based upon CoStar Group, Inc.'s achievement of a three year performance goal.

F3: Represents all shares of Common Stock owned, consisting of 30,339 shares of Common Stock and 21,587 shares of Common Stock subject to unvested Restricted Stock Grants.

F4: The option vests in three equal installments on February 28, 2015, February 28, 2016, and February 28, 2017.