COSTAR GROUP, INC. — Director's Dealing 2012

Dec 3, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COSTAR GROUP INC (CSGP)
CIK: 0001057352
Period of Report: 2012-12-01

Reporting Person: Radecki Brian J (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-12-01	Common Stock, par value $0.01 per share	A	18	—	Acquired	65717	Direct

Footnotes

F1: Service award granted by the Company for the reporting person's 15-year anniversary of employment. The closing stock price of the Company's common stock on the trading day immediately preceding the date of grant was $86.86.

F2: Represents all shares of Common Stock owned, consisting of 15,249 shares of Common Stock and 50,468 shares of Common Stock subject to unvested Restricted Stock Grants.