The latest upgrades in the stocks market as of the 15th of December 2010 include Amgen (NASDAQ:AMGN) which was upgraded from Neutral to Overweight at Piper Jaffray. At Janney Montgomery EMC (NYSE:EMC) and UniTek Global Services (NASDAQ:UNTK) both started at Buy. Over at UBS, Blue Coat Systems (NASDAQ:BCSI) began at Buy while Tutor Perini Corp [...]