Benzinga's Top #PreMarket Gainers By: Benzinga via Benzinga September 05, 2014 at 08:05 AM EDT Prana Biotechnology (NASDAQ: PRAN) jumped 26.17% to $2.70 in pre-market trading as the company received the FDA Orphan Designation for ... Read More >> Related Stocks: Ambarella Inc El Pollo Loco