Benzinga's Top #PreMarket Gainers

Alexza Pharmaceuticals, Inc. ALXA shares climbed 52.62 percent to $1.340 in pre-market trading after the company reported interim results from Phase 2a study of AZ-002 in epilepsy patients. pSivida Corp. PSDV shares surged 42.16 percent to $5.26 in pre-market trading after the company reported that Medidur has met primary efficacy endpoint in Phase 3 trial. Express Scripts Holding Company ESRX shares spiked 4.19 percent to $90.80 in pre-market trading after the company reaffirmed its FY15oOutlook and issued a strong FY16 earnings guidance. Relypsa Inc RLYP shares jumped 2.95 percent to $27.90 after dropping 2.94 percent on Monday. Nantkwest Inc NK shares climbed 2.27 percent to $16.25 in pre-market trading. Analysts at Canaccord Genuity initiated coverage of NantKwest with a Buy rating.