NEW YORK ( TheStreet) -- CHANGE IN RATINGSBruker ( BRKR) upgraded at BofA/Merrill to Neutral from Underperform, Bank of America/Merrill Lynch said. $19.50 price target. Fundamentals are improving. Commtouch Software ( CTCH) downgraded to hold at TheStreet Ratings. Depomed ( DEPO) upgraded to hold at TheStreet Ratings. Groupon ( GRPN) upgraded at Piper from Neutral to Overweight, Piper Jaffray said. $8 price target. Expect the company to show better international growth. Heckmann Corporation ( HEK) downgraded at Jefferies to Hold from Buy, Jefferies said. $4.50 price target. Shale activity looks sluggish. Verifone ( PAY) downgraded at JP Morgan to Neutral, JP Morgan said. Recent earnings miss was worse than expected. Polypore ( PPO) downgraded at Wedbush from Outperform to Neutral, Wedbush said. $38 price target. Lithium segment continues to deteriorate. Questcor ( QCOR) upgraded at Mizuho from Neutral to Buy, Mizuho said. $41 price target. Company should exceed consensus expectations in the near term. QEP Resources ( QEP) downgraded at Jefferies to Hold from Buy, Jefferies said. $34 price target. Ambiguous upstream value. SVB Financial ( SIVB) downgraded at Sterne Agee from Buy to Neutral, Sterne Agee said. Valuation call, based on a $68 price target. UnitedHealth Group ( UNH) upgraded at Oppeneheimer to Outperform from Perform, Oppenheimer said. $66 price target. Attractive in light of a pessimistic outlook. Vantiv ( VNTV) upgraded at Wells to Outperform, Wells Fargo said. Estimates also boosted, given improved customer spending.