Why Gilead Sciences, Inc. (GILD), Valeant Pharmaceuticals Intl Inc (VRX) and Core-Mark Holding Company, Inc. (CORE) Are 3 of Today’s Worst Stocks By: InvestorPlace August 29, 2016 at 16:55 PM EDT Read More >> Related Stocks: Core Mark Holding Gilead Sciences Gsk Plc ADR Valeant Pharmaceuticals International, Inc.