Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga October 22, 2015 at 08:20 AM EDT Relypsa Inc (NASDAQ: RLYP) fell 13.93 percent to $13.90 in pre-market trading following Wednesday's FDA approval of the company's ... Read More >> Related Stocks: American Express Caterpillar Horizon Therapeutics Tenet Healthcare