Benzinga's Top #PreMarket Gainers

OncoMed Pharmaceuticals OMED surged 8.30% to $30.00 in the pre-market session after Jefferies lifted the price target on the stock from $27 to $46. ChemoCentryx CCXI shares gained 3.59% to $5.20 in the pre-market as the company reported positive top-line results of CCX168 Phase II data. Camtek CAMT soared 2.62% to $4.70 in the pre-market trading. Camtek shares have jumped 215.86% over the past 52 weeks, while the S&P 500 index has gained 27.38% in the same period. J.C. Penney Co JCP shares jumped 2.27% to $10.34 in pre-market trading after the company reported a 10.1% rise in its comparable-store sales in November.