Benzinga's Top #PreMarket Gainers

Digital River

shares jumped 48.16% to $25.75 in pre-market trading after the company agreed to be acquired by investor group led by Siris Capital Group for $26.00 per share in cash. Vitae Pharmaceuticals

shares jumped 41.62% to $12.25 in pre-market trading after the company reported positive top-line results from clinical trials in treatment and prevention of Alzheimer's disease as part of the collaboration with Boehringer Ingelheim. Lakeland Industries

shares rose 17.56% to $17.94 in pre-market trading after gaining 16.22% on Thursday. KLA-Tencor

gained 11.48% to $79.15 in pre-market trading after the company reported better-than-expected Q1 results. The company announced a $16.50 per share special dividend and added 3.6 million shares to buyback.