ITEMS 1.01, 2.01

Company

COSTAR GROUP, INC.

Filed

February 3, 2011

Period of Report

February 2, 2011

Accession Number

0001057352-11-000003

An 8-K is a current report used to announce material events that shareholders should know about — such as earnings releases, mergers, executive changes, or bankruptcy. Learn more about 8-K filings →