Tesoro leads losers as energy stocks flip-flop By: MarketWatch March 21, 2013 at 11:19 AM EDT Energy stocks flip-flop between small gains and losses on Thursday, with shares of Tesoro Corp. declining the most. Read More >> Related Stocks: Chevron Corp ConocoPhillips Exxon Mobil Occidental Petroleum Range Resources Southwestern Energy Tesoro Petroleum Co Wpx Energy Inc