Energy stocks jumped in premarket trading. ProShares Ultra Bloomberg Crude Oil up 5%; Marathon Petroleum, Phillips 66, Valero, apache up 4%; United States Oil Fund LP, Exxon Mobil, ConocoPhillips, Devon, Chevron up 3%; BP PLC, Occidental up 2%. SHELL PLC SPON ADS EACH REPR 2 ORD SHS up 1%.