Benzinga's Top #PreMarket Gainers

ViroPharma VPHM surged 25.98% to $49.61 in the pre-market session after the company agreed to be acquired by Shire SHPG for $50 per share. Gogo GOGO shares jumped 12.05% to $21.01 in pre-market trading after the company reported upbeat Q3 results and raised its FY13 revenue forecast. Ariad Pharmaceuticals ARIA shares gained 6.03% to $2.46 in the pre-market. Ariad shares have jumped 89.05% over the past 52 weeks, while the S&P 500 index has gained 28.30% in the same period. Given Imaging GIVN soared 3.98% to $22.72 in the pre-market trading after the company received reimbursement approval for PillCam COLON in Japan.