NEW YORK--(BUSINESS WIRE)--Why: Rosen Law Firm, a global investor rights law firm, announces an investigation of potential securities claims on behalf of shareholders of CarMax, Inc. (NYSE: KMX) resulting from allegations that CarMax may have issued materially misleading business information to the investing public. So What: If you purchased CarMax securities you may be entitled to compensation without payment of any out of pocket fees or costs through a contingency fee arrangement. The Rosen L. ...