COSTAR GROUP, INC. — Director's Dealing 2016

Nov 1, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COSTAR GROUP INC (CSGP)
CIK: 0001057352
Period of Report: 2016-10-31

Reporting Person: NASSETTA CHRISTOPHER J (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-10-31	Common Stock, par value $0.01 per share	S	500	$187.73	Disposed	25910	Direct
2016-11-01	Common Stock, par value $0.01 per share	S	75	$187.30	Disposed	25835	Direct

Footnotes

F1: Average based on sales prices ranging from $186.14 to $188.72.

F2: Represents all shares of Common Stock owned, consisting of 23,215 shares of Common Stock and 2,695 shares of Common Stock subject to unvested Restricted Stock grants.

F3: Represents all shares of Common Stock owned, consisting of 23,140 shares of Common Stock and 2,695 shares of Common Stock subject to unvested Restricted Stock grants.