Benzinga's Top #PreMarket Gainers By: Benzinga via Benzinga May 20, 2014 at 08:20 AM EDT Ophthotech (NASDAQ: OPHT) soared 23.97% to $39.00 in the pre-market trading after the company reported that it has entered into an ex-US ... Read More >> Related Stocks: Astrazeneca Plc ADR Clovis Oncology Inc Ophthotech Corp Pfizer