Energy stocks are worst performers in S&P 500 By: MarketWatch June 10, 2013 at 13:41 PM EDT Energy stocks fall, the worst performing sector in the S&P 500 Index, as the broader market was mixed. Read More >> Related Stocks: BP Plc ADR Cabot Oil & Gas Chevron Corp ConocoPhillips Devon Energy Exxon Mobil Kinder Morgan