Energy stocks down, look to end week higher By: MarketWatch May 31, 2013 at 12:31 PM EDT Energy stocks fall on Friday, one of the few sectors in the S&P 500 Index to post losses, and look set to end the week only marginally higher. Read More >> Related Stocks: Chesapeake Energy Chevron Corp ConocoPhillips Energy Select Sector SPDR Exxon Mobil Newfield Exploration Phillips 66 Tesoro Petroleum Co Valero Energy Wpx Energy Inc