COSTAR GROUP, INC. — Director's Dealing 2012

Oct 9, 2012

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: COSTAR GROUP INC (CSGP)
CIK: 0001057352
Period of Report: 2012-09-27

Reporting Person: CARCHEDI FRANCIS (SVP Corporate Development)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, par value $0.01 per share	25376	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Option to Acquire Common Stock	$37.42	2019-07-15	Common Stock (40000)		Direct

Footnotes

F1: Represents all shares of Common Stock owned, consisting of 2,000 shares of Common Stock and 23,376 shares of Common Stock subject to unvested Restricted Stock Grants.

F2: The option vests in four equal installments on July 16, 2010, July 16, 2011, July 16, 2012 and July 16, 2013.