BlackBerry (NASDAQ:BBRY) was upgraded by investment analysts at Oppenheimer from an “underperform” rating to a “market perform” rating in a note issued to investors on Tuesday, Analyst RN reports. BlackBerry Ltd (NASDAQ:BBRY) stock performance was -3.28% in last session and finished the day at $ 7.67. Traded volume was 150.00 million shares in the last session and the average volume of the stock remained 16.18 … Continue reading Hot Stocks: BlackBerry Ltd (NASDAQ:BBRY), Comtech Telecomm. Corp. (NASDAQ:CMTL), Cempra Inc (NASDAQ:CEMP), Aaron’s, Inc. (NYSE:AAN)