NEW YORK ( TheStreet) -- CHANGE IN RATINGS Activision Blizzard ( ATVI) was downgraded at Sterne Agee from buy to neutral. Estimates also cut, as Call of Duty sales appear to be slowing, Sterne Agee said. Charter Communications ( CHTR) was initiated with a buy rating at UBS. $83 price target. Benefiting from less telco competition, UBS said. Rockwell Collins ( COL) was downgraded at Oppenheimer to perform from outperform. Valuation looking full, Oppenheimer said. Cree ( CREE) was downgraded at Deutsche Bank from buy to hold. $33 price target. Valuation call, as the stock is up 50% year to date, Deutsche said. DR Horton ( DHI) was upgraded at Compass Point from sell to neutral. $18 price target. Company has limited downside potential from current levels, Compass Point said. Fairchild Semiconductor ( FCS) was initiated with a buy rating at MKM Partners. $16 price target. Consensus underestimating revenue and margin upside, MKM said. Guess ( GES) was upgraded at Piper Jaffray from neutral to overweight. $31 price target. Company is seeing better domestic sales, and business in Europe appears to have bottomed, Piper Jaffray said. IAC/InterActiveCorp ( IACI) was upgraded at Wells Fargo from market perform to outperform. Recent weakness has created an attractive entry point, Wells Fargo said. Jazz Pharmaceuticals ( JAZZ) was initiated with a buy rating at UBS. $64 price target. Visibility into Xyrem's sustainability and EPS growth should drive upside, UBS said. Carmax ( KMX) was upgraded at Goldman Sachs from neutral to buy. $42 price target. Earnings appear to be at an inflection point, Goldman Sachs said. Nike ( NKE) was upgraded at HSBC from neutral to overweight. $112 price target. Company is turning its business around, HSBC said. ON Semiconductor ( ONN) was rated new buy at MKM Partners. $8 price target. See upside to consensus estimates, MKM said. Plantronics ( PLT) was upgraded at JP Morgan from neutral to overweight. Valuation call, as the stock is down 8% year to date, JP Morgan said. $41 price target. Research In Motion ( RIMM) was upgraded at Goldman Sachs from neutral to buy. $16 price target. Risk/reward is attractive ahead of the Blackberry 10 launch, Goldman said.