Benzinga's Top #PreMarket Gainers

OncoMed Pharmaceuticals (NASDAQ: OMED ) surged 80.40% to $25.40 in the pre-market session on deal to sell 1.47 million shares to Celgene (NASDAQ: CELG ) at $15.13 per share. Conatus Pharmaceuticals (NASDAQ: CNAT ) shares gained 25.57% to $7.71 in the pre-market as the company confirmed the FDA