CURRENT REPORT, ITEM 8.01

Company

COSTAR GROUP, INC.

Filed

January 31, 2012

Period of Report

January 31, 2012

Accession Number

0001057352-12-000006

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 →