Benzinga's Top Pre-Market Gainers

CardioNet

soared 46.73% to $4.71 in the pre-market trading after the company entered into an agreement with UnitedHealthcare Insurance. Questcor Pharmaceuticals

moved up 16.45% to $42.75 in the pre-market session after the company acquired rights to develop Synacthen®. Catamaran

shares gained 12.62% to $54.80 in the pre-market session after Cigna

entered into a 10-year agreement with Catamaran. Vanda Pharmaceuticals

surged 3.98% to $10.45 in the pre-market session. Vanda Pharmaceuticals shares have jumped 138.15% over the past 52 weeks, while the S&P 500 index has gained 24.06% in the same period.