CNBC | S&P 500 pulls back as oil tanks more than 2% again CNBC U.S. stocks traded mostly lower on Wednesday as oil prices failed to rebound from a sharp fall during the previous session. The S&P 500 fell 0.15 percent as energy stocks fell 1.6 percent to lead decliners. The sector briefly erased losses after ... Oil Rebound Fizzles Despite Stockpiles Drop; Dow, S&P 500 Turn Red Stocks hold steady as oil's slide halts |