Why 3D Systems Corporation (NYSE:DDD), Xerox Corp. (NYSE:XRX) and Perrigo Company plc (NYSE:PRGO) Are 3 of Today’s Worst Stocks By: InvestorPlace April 24, 2015 at 12:44 PM EDT Read More >> Related Stocks: 3D Systems Corp Mylan Perrigo Teva Pharmaceutical Industries ADR Xerox Corp