NV Energy ( NVE) upgraded at BofA/Merrill from Neutral to Buy, Bank of America/Merrill Lynch said. Company has solid earnings quality and can grow the dividend faster than its peers. $19 price target. Rosetta Resources ( ROSE) downgraded at BMO to Market Perform, BMO Capital said. $40 price target. NGL pricing could remain a headwind. Southern Company ( SO) downgraded at BofA/Merrill from Buy to Neutral, Bank of America/Merrill Lynch said. Valuation call, based on a $48 price target. Universal Health Services ( UHS) rated new Neutral at UBS. $43 price target. Strong behavioral segment results building on PSI acquisition. UnitedHealth rated new Buy at Cantor Fitzgerald. $70 price target. Company is seeing above-average enrollment growth and can deliver solid earnings growth. Walgreen ( WAG) downgraded at Argus from Buy to Hold, Argus said. Alliance Boots purchase complicates the company's business model. Whole Foods ( WFM) rated new Buy at Cantor. $104 price target. Company should continue to execute at peak levels. Wellpoint ( WLP) rated new Hold at Cantor. $75 price target. Company still needs to show that enrollment and earnings can improve. Wellpoint ( WLP) downgraded at Leerink from Outperform to Market Perform, Leerink Swann said. Valuation call; as the stock is up 8% this month, ahead of the Supreme Court ruling on healthcare reform.