Editor's Note: Green and red arrows refer to intraday stock price movement.NEW YORK ( TheStreet) -- CHANGE IN RATINGS AGL Resources ( AGL) upgraded at Citigroup from Hold to Buy, Citigroup said. Sell-off following the Nicor merger appears overdone. Bunge ( BG) downgraded at BMO to Market Perform, BMO Capital said. Valuation call, based on a $73 price target. Ciena ( CIEN) downgraded at UBS from Neutral to Sell, UBS said. $19 price target. See limited upside to the company's business model. Cytec Industries ( CYT) upgraded at Deutsche from Hold to Buy, Deutsche Bank said. $65 price target. Company is seeing better business momentum and is buying back stock. Quest Diagnostics ( DGX) upgraded at Morgan Stanley to Equal-weight, Morgan Stanley said. Company should see a more stable utilization environment. Emdeon ( EM) downgraded at Morgan Stanley from Overweight to Equal-weight, Morgan Stanley said. Valuation call. Home Depot ( HD) upgraded at Goldman to Buy. Company has high sale visibility and can grow profitability. New $42 price target. Lowe's ( LOW) downgraded at Goldman to Neutral, Goldman Sachs said. Company could face some disruptions, given the changes within its senior management. $28 price target. MB Financial ( NBFI) upgraded at Baird from Neutral to Outperform, Robert Baird said. $26 price target. Company has a measured approach to repaying TARP and significant potential earnings power. Motorola Mobility ( MMI) rated new Neutral at UBS. $33 price target. Company has the potential to turn its business around, but the industry will likely remain challenging. Motorola Solutions ( MSI) rated new Neutral at Cowen. Valuation call. Noble ( NE) downgraded at Sterne Agee to Neutral. Valuation call, as the company could be further affected by its exposure to the Gulf of Mexico. National Oilwell Varco ( NOV) upgraded at Sterne Agee to Buy. $90 price target. Earnings can move above prior peak levels. Oshkosh ( OSK) upgraded at JP Morgan from Underweight to Neutral, JP Morgan said. $42 price target. Company has new clarity around its Defense segment. Penn National ( PENN) downgraded at Keybanc from Buy to Hold, Keybanc said. Valuation call, as the stock is up 57% over the past seven months.