St. Jude Medical, Inc. (NYSE:STJ) was upgraded by Zacks Investment Research from a “sell” rating to a “hold” rating in a report issued on Tuesday, Marketbeat.com reports. According to Zacks, “St. Jude’s fourth-quarter 2015 results reflect strong momentum at the company’s Atrial Fibrillation and Neuromodulation businesses. We believe that an expanding addressable market and innovative […]