Benzinga's Top #PreMarket Gainers

Horizon Pharma

surged 20.91% to $17.75 in the pre-market session after the company announced its plans to acquire privately held Vidara Therapeutics International for around $660 million. Exact Sciences

surged 10.26% to $15.90 in pre-market trading following the published results of colon cancer screening test. Compugen

shares gained 4.37% to $11.95 in the pre-market after Jefferies initiated coverage on the stock with a Buy rating and a $17.00 price target. Juniper Networks

shares jumped 2.51% to $26.56 in pre-market trading after Wells Fargo upgraded the stock from Market Perform to Outperform.