NEW YORK ( TheStreet) -- CHANGE IN RATINGSAccenture ( ACN) was initiated with a buy rating at UBS. Based on bookings, revenues should see reacceleration, and EPS growth of 17% is expected in the second half of the year, UBS said. Price target is $85. Actavis ( ACT) was upgraded to buy at TheStreet Ratings. Amazon ( AMZN) was initiated with a neutral rating at UBS. The company's secular positioning is a positive, but operating costs remain a headwind given investment mode, UBS said. Price target is $275. Sothebys ( BID) was upgraded to buy at TheStreet Ratings. Buffalo Wild Wings ( BWLD) was initiated with a neutral rating at Credit Suisse. $92 price target. Acquisitions add risk to the model, Credit Suisse said. CME Group ( CME) was downgraded at Credit Suisse to neutral from outperform. Valuation call, Credit Suisse said. DaVita HCP ( DVA) was upgraded at Deutsche Bank to buy from hold. $136 price target. Less concerned about HCP's year-over-year earnings trajectory, Deutsche said. eBay ( EBAY) was upgraded at Topeka Capital Markets to buy from hold. $65 price target. Management should continue to execute on its growth strategy, Topeka Capital Markets said. EZCorp ( EZPW) was downgraded at FBR Capital Markets to underperform from market perform. $17.50 price target. Company is highly leveraged to the U.S. and gold, FBR Capital Markets said. Facebook ( FB) was initiated with a neutral rating at UBS. Monetization of mobile, a focus on protecting the user experience, and high investment needs will create a drag on performance in 2013, UBS said. Price target is $26. F5 Networks ( FFIV) was upgraded at Robert Baird to outperform from neutral. Checks show better demand in traditional markets and security, Baird said. GNC Holdings ( GNC) was upgraded at Deutsche Bank to buy from hold. $50 price target. Investor fear seems more than discounted into shares, Deutsche said. Groupon ( GRPN) was initiated with a sell rating at UBS. Uncertainty about the business model, recent operating trends and changing management drive the cautious stance, UBS said. Price target is $4.40. Goldman Sachs ( GS) was downgraded at Bank of America/Merrill Lynch to neutral from buy. Valuation call, based on a $155 price target, BofA/Merrill said.