COSTAR GROUP, INC. — Director's Dealing 2011

Aug 2, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COSTAR GROUP INC (CSGP)
CIK: 0001057352
Period of Report: 2011-08-01

Reporting Person: Marples Paul (Managing Director, FOCUS)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-08-01	Common Stock, par value $0.01 per share	A	17	—	Acquired	16273	Direct

Footnotes

F1: Service award granted by the Company for the reporting person's 10-year anniversary of employment. The closing stock price of the Company's common stock on the date of grant was $59.04.

F2: Represents all shares of Common Stock owned, consisting of 10,472 shares of Common Stock and 5,801 shares of Common Stock subject to unvested Restricted Stock Grants.