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 Tandem Diabetes Care, Inc. (NASDAQ: TNDM) resulting from allegations that Tandem Diabetes Care may have issued materially misleading business information to the investing public. So What: If you purchased Tandem Diabetes Care securities you may be entitled to compensation without payment of any out of pocket fees or costs throu. ...