Benzinga's Top #PreMarket Gainers

Celladon Corp CLDN shares surged 4.92 percent to $2.77 in pre-market trading after tumbling 80.70 percent on Monday. Merck & Co., Inc. MRK shares rose 4.75 percent to $59.81 in pre-market trading after the company reported upbeat results for the first quarter. YY Inc (ADR) YY shares climbed 3.50 percent to $66.90 in pre-market trading after gaining 1.21 percent on Monday. JD.Com Inc(ADR) JD shares gained 3.46 percent to $36.50 in the pre-market trading session after rising 1.61 percent on Monday. Corning Incorporated GLW gained 2.77 percent to $23.00 in pre-market trading after the company reported better-than-expected Q1 earnings.