Benzinga's Top #PreMarket Gainers

Geron GERN surged 13.77% to $6.28 in the pre-market session following the company's Monday presentation at ASH. Needham upgraded the stock from Hold to Buy. Rambus RMBS soared 10.43% to $9.42 in the pre-market trading as the company and Micron Technology MU signed a broad patent cross license agreement. Relypsa RLYP shares jumped 9.95% to $21.98 in pre-market trading after Wedbush initiated coverage on the stock with an Outperform rating and a $34.00 price target. Vitran Corp Inc VTNC shares gained 7.01% to $5.80 in the pre-market after the company agreed to be acquired by Manitoulin Transport for $6.00 per share.