NEW YORK ( TheStreet) -- CHANGE IN RATINGS Adtran ( ADTN) was upgraded at UBS to neutral from sell. Valuation call, based on a $24 price target, UBS said. Infoblox ( BLOX) was upgraded at Sterne Agee to buy. $47 price target. Estimates also boosted, given stronger expected secular growth, Sterne Agee said. Energy Company of Minas ( CIG) was downgraded to sell at TheStreet Ratings. Cabot ( COG) was upgraded at Topeka to buy from hold. $45 price target. Recent weakness has created a buying opportunity, Topeka said. DFS) was upgraded to buy from neutral at Citigroup. $56 price target. Risk/reward more attractive on pullback, Citigroup said. Hewlett-Packard ( HPQ) was upgraded at Mizuho to neutral from underperform. $22 price target. Company is focused on growth opportunities and managing the declines in other areas, Mizuho said. Nu Skin ( NUS) was upgraded at DA Davidson to buy from neutral. Valuation call, based on a $110 price target, DA Davidson said. PICO) was upgraded to hold at TheStreet Ratings. Rock-Tenn ( RKT) was upgraded at DA Davidson to buy from neutral. Stocks has pulled back 21% since posting blowout earnings, DA Davidson said. Stratasys ( SSYS) was upgraded at J.P. Morgan to overweight from neutral. $101.50 price target. Pullback provides entry point for long-term investors, J.P. Morgan said.