Linear Technology ( LLTC) was upgraded at Jefferies to buy. $44 price target. Company is leveraged to higher automotive and industrial growth, Jefferies said. Optical Cable ( OCC) was downgraded to hold at TheStreet Ratings. ON Semiconductor ( ONNN) was downgraded at Jefferies to hold. $8.50 price target. Company may face multiple compression, as the chip sector is entering the late innings of the cycle, Jefferies said. PANW) was upgraded at UBS to buy from neutral. Unjustified low valuation despite industry leading growth, said UBS. Price target is $55. Sprint Nextel ( S) was downgraded at Citigroup to neutral from buy. Margin expansion from Network Vision is priced in, said Citigroup. Price target is now $7.50. Sprint Nextel was upgraded at Deutsche Bank to buy from hold. New analyst has an $8 price target. Company will be the king of new spectrum and can drive above-average growth over the next few years, Deutsche Bank said. Tenet Healthcare ( THC) was initiated with a hold rating at Keybanc. Valuation call, as the stock is up 115% over the past year, Keybanc said.