NEW YORK ( TheStreet) -- CHANGE IN RATINGS Adtran ( ADTN) was downgraded at Citigroup to sell from neutral. $12.50 price target. Challenges in its mainstay wireline access franchise, Citi said. America Movil ( AMX) downgraded to hold at TheStreet Ratings. Biostar Pharmaceuticals ( BSPM) downgraded to sell at TheStreet Ratings. Bob Evans ( BOBE) was downgraded at Keybanc from buy to hold. $45 price target. Management is taking multiple steps to improve shareholder value, Keybanc said. Cummins ( CMI) was initiated with an outperform rating at Robert Baird. $119 price target. Truck orders should pick up in 2013, and new orders should help drive growth, Baird said. Cabot Oil & Gas ( COG) was initiated with a neutral rating at UBS. $50 price target. Marcellus constraints won't be fixed until mid 2013, UBS said. Concho ( CXO) was initiated with a buy rating at UBS. $93 price target. Asset oiliness and well productivity are underappreciated, UBS said. Darden Restaurants ( DRI) was downgraded at Jefferies to hold from buy. $47 price target. Finding it tougher to turn SSS trends, Jefferies said. Chart Industries ( GTLS) was initiated with a hold rating at Stifel Nicolaus. Company lacks near-term catalysts, Stifel Nicolaus said. Kodiak Oil and Gas ( KOG) was initiated with a buy rating at UBS. $12 price target. Expect higher capital efficiency in 2013 and upside to consensus production, UBS said. Liberty Media ( LMCA) was downgraded at Wunderlich from buy to hold. $110 price target. Company lost DIS studio content to NFLX, Wunderlich said. Limited ( LTD) was initiated with a market perform rating at FBR Capital Markets. $50 price target. Sales momentum has been decelerating at Victoria's Secret, FBR said. NVIDIA ( NVDA) was downgraded at Oppenheimer to perform from outperform. Hard to ignore PC outlook, Oppenheimer said. VeriFone ( PAY) was upgraded at UBS to buy from neutral. $39 price target. Risk/reward tilts favorably, UBS said. PNC Financial ( PNC) was upgraded at Compass Point from neutral to buy. $63 price target. Stock is already pricing in lower net interest income, Compass Point said. Portland General ( POR) was initiated with a hold rating at Keybanc. Company is spending a lot and faces near-term rate decisions, Keybanc said. Bankrate ( RATE) was initiated with a buy rating at Needham. $15 price target. Company is a high-quality operator with high barriers to entry, Needham said.