NEW YORK ( TheStreet) -- CHANGE IN RATINGSAllianceBernstein ( AB) upgraded to buy at TheStreet Ratings. ACCO Brands ( ACCO) downgraded to hold at TheStreet Ratings. Aruba Networks ( ARUN) upgraded at Morgan Stanley to overweight, Morgan Stanley said. $28 price target. Company is realizing higher margins. Colgate-Palmolive ( CL) rated new sell at Canaccord. Valuation call, based on a $102 price target. Centurylink ( CTL) downgraded at JP Morgan from overweight to neutral, JP Morgan said. $38 price target. Valuation call, following the company's dividend cut. Centurylink downgraded at Nomura to reduce. $30 price target. Company has a lower free cash flow outlook and lowered its dividend. Edison International ( EIX) downgraded at Jefferies to underperform from hold, Jefferies said. $40.50 price target. Delay to the restart of San Onofre. Entergy ( ETR) downgraded at UBS to sell from neutral, UBS said. $55 price target. Challenging regulatory calendar. EZchip Semiconductor ( EZCH) upgraded at Oppenheimer to outperform from perform, Oppenheimer said. $31 price target. Favorable risk- reward. Sourcefire ( FIRE) upgraded at UBS to buy from neutral, UBS said. $54 price target. Concerns around federal may be overdone. FMC Technologies ( FTI) downgraded at SocGen from buy to hold, Societe Generale said. $55 price target. Valuation call, as the stock is up 25% since late December. Hyatt Hotels ( H) downgraded at FBR from outperform to market perform, FBR Capital Markets said. Company faces multiple growth headwinds. Ingram Micro ( IM) upgraded at Needham from hold to buy, Needham said. $22 price target. Company is leveraged to higher IT spending. Itron ( ITRI) downgraded at JP Morgan from overweight to neutral, JP Morgan said. $45.50 price target. Estimates also cut, given the company's new guidance. Medtronic ( MDT) downgraded at Lazard to neutral, Lazard Capital Markets said. Stock is up 30% over the past 8 months and the company lacks near-term catalysts. Nabors Industries ( NBR) upgraded at Goldman from neutral to buy, Goldman Sachs said. Company was also placed on the Conviction List. Valuation call, based on a $23 price target. ServiceNow ( NOW) upgraded at UBS to buy from sell, UBS said. $36 price target. Platform should drive upside to estimates. Nvidia ( NVDA) downgraded at Needham from buy to hold, Needham said. Company is seeing lower Tegra demand.