Benzinga's Top #PreMarket Gainers By: Benzinga via Benzinga March 20, 2015 at 08:14 AM EDT Prothena Corporation plc (NASDAQ: PRTA) shares gained 39.24% to $40.70 in the pre-market trading session on news that the company's ... Read More >> Related Stocks: Biogen Idec Ctrip.com Intl Ltd Intercept Pharmaceuticals Nike Inc Prothena Corp