NEW YORK ( TheStreet) -- CHANGE IN RATINGS:Affymetrix ( AFFX) was upgraded to Hold at TheStreet Ratings Alkermes ( ALKS) was upgraded to Buy at TheStreet Ratings. Amerigas Partners ( APU) was upgraded to Buy at TheStreet Ratings. Bob Evans ( BOBE) was downgraded at Keybanc from buy to hold. Have less confidence in near-term growth potential, Keybanc said. Buffalo Wild Wings ( AJG) was upgraded at Keybanc from hold to buy. Valuation call, based on an $85 price target, Keybanc said. Chubb ( CB) was upgraded at Deutsche Bank from hold to buy. $90 price target. Company offers the best value in the industry, Deutsche said. Flowserve ( FLS) was downgraded at UBS to neutral from buy. $160 price target. Move to neutral while awaiting big projects, UBS said. Gamestop ( GME) was upgraded at Piper Jaffray to overweight. Company is leveraged to a solid near-term release slate, Piper Jaffray said. $28 price target. Healthsouth ( HLS) was downgraded at Deutsche Bank from buy to hold. Valuation call, based on a $25 price target, Deutsche said. Hillshire Brands ( HSH) was upgraded at DA Davidson to neutral. $32 price target. Estimates were also raised as the company is cutting costs, DA Davidson said. Harris Teeter ( HTSI) was downgraded at UBS to neutral from buy. $42 price target. Following the right strategy, but costing more than expected, UBS said. Invesco ( IVZ) was downgraded at Morgan Stanley from overweight to equal-weight. $30 price target. Company lacks near-term catalysts, Morgan Stanley said. Keynote Systems ( KEYN) was upgraded to Buy at TheStreet Ratings. Louisiana-Pacific ( LPX) was upgraded at BMO Capital to outperform. $24 price target. Stock is attractive, following a recent pullback, BMO Capital said. Landstar ( LSTR) was downgraded at J.P. Morgan from overweight to neutral. $58 price target. Company has limited near-term visibility, J.P. Morgan said. Life Time Fitness ( LTM) was downgraded at William Blair to market perform. Estimates were also cut, given the company's new guidance, William Blair said. Mastercard ( MA) was downgraded at Wells Fargo to market perform. Valuation call, as the stock is up 131% since the beginning of 2011, Wells Fargo said. Methanex ( MEOH) was downgraded to Hold at TheStreet Ratings. Nordion ( NDZ) was downgraded to Sell at TheStreet Ratings. Oracle ( ORCL) was upgraded at BMO Capital from market perform to outperform. $43 price target. Sales growth outlook has improved materially, BMO Capital said. Paccar ( PCAR) was upgraded at Wells Fargo from market perform to outperform. Consensus earnings expectations now appear achievable, Wells Fargo said.