Morning Market Movers

Tesaro

surged 20.45% to $28.92 after the company reported successful primary and secondary endpoints in final Phase 3 trial for rolapitant. Pinnacle Foods

climbed 16.68% to $35.53 after Hillshire Brands Co

announced its plans to buy Pinnacle Foods for around $6.6 billion including debt. Liquid Holdings Group

gained 18.10% to $3.49. Liquid Holdings is expected to release its Q1 financial results on May 13, 2014. Gulf Resources

climbed 15.73% to $2.06 after the company reported its Q1 net income of $4.3 million or $0.11 per share. IsoRay

shares jumped 15.22% to $2.65 after the company reported that the company's Liquid Cesium-131 has received final regulatory approval for use in GliaSite brain cancer treatment system. Arotech

shares rose 12.79% to $3.44. B Riley upgraded Arotech from Neutral to Buy. Gogo

shares jumped 7.96% to $12.88 after the company reported upbeat Q1 results. Logitech International SA

jumped 6.95% to $13.39 after Credit Suisse upgraded the stock from Neutral to Outperform. Twitter

shares surged 3.59% to $33.20 after SunTrust Robinson Humphrey upgraded the stock from Neutral to Buy.