Today's noteworthy upgrades include: AMC Networks (AMCX) upgraded to Overweight at Morgan Stanley... Assurant (AIZ) upgraded to Buy from Underperform at BofA/Merrill... BG Group (BRGYY) upgraded to Outperform from Neutral at Credit Suisse... CarMax (KMX) upgraded to Conviction Buy from Buy at Goldman... Extended Stay America (STAY) upgraded to Outperform from Neutral at Baird... Finish Line (FINL) upgraded to Buy from Neutral at Buckingham... First Potomac (FPO) upgraded on positive outlook at BMO Capital... Helmerich & Payne (HP) upgraded to Accumulate from Neutral at Global Hunter... Infineon (IFNNY) upgraded to Neutral from Underperform at BofA/Merrill... NVIDIA (NVDA) upgraded to Outperform from Neutral at Macquarie... Plexus (PLXS) upgraded to Buy from Neutral at Goldman... RAIT Financial (RAS) upgraded to Buy from Neutral at Ladenburg... Royal Dutch Shell (RDS.A) upgraded to Buy from Neutral at UBS... Torchmark (TMK) upgraded to Market Perform from Underperform at FBR Capital... WebMD (WBMD) upgraded to Buy from Neutral at SunTrust... WestRock (WRK) upgraded to Outperform from Market Perform at Wells Fargo... Whiting Petroleum (WLL) upgraded to Buy from Hold at Canaccord.