NEW YORK ( TheStreet) -- CHANGE IN RATINGSAutomatic Data ( ADP) downgraded at Wells to Market Perform, Wells Fargo said. Valuation call. Estimates also cut, to match the company's new guidance. Automatic Data Processing downgraded at Citigroup to Neutral from Buy, Citigroup said. $60 price target. Valuation call. AdCare Health Systems ( ADK) upgraded to hold at TheStreet Rating. Buckeye Technologies ( BKI) downgraded at UBS to Neutral from Buy, UBS said. $36 price target. Recent strong share performance and slower expected earnings growth. Cooper Industries ( CBE) downgraded at UBS to Neutral from Buy, UBS said. $62 price target. Limited upside folliwing a strong run up. Chesapeake Energy ( CHK) downgraded at JP Morgan from Neutral to Underweight, JP Morgan said. Company lacks near-term catalysts. Covance ( CVD) downgraded at Goldman from Buy to Neutral, Goldman Sachs said. $46 price target. Demand trends are unstable and the company is facing higher operating costs. Delta Air Lines ( DAL) upgraded at Evercore from Underweight to Equal-weight, Evercore Partners said. $11 price target. Company is seeing better sales trends. Dover ( DOV) upgraded at Stifel from Hold to Buy, Stifel Nicolaus said. $76 price target. Company boosted its guidance. Dr. Pepper Snapple ( DPS) upgraded at Goldman from Sell to Neutral, Goldman Sachs said. $41 price target. Commodity prices are declining. Consolidated Edison ( ED) upgraded at Jefferies to Hold from Underperform, Jefferies said. $59.50 price target. Upgrade based on valuation. E*Trade ( ETFC) downgraded at Goldman from Buy to Neutral, Goldman Sachs said. Estimates also cut, given a lower net interest margin and reduced trading activity. $9 price target. General Dynamics ( GD) downgraded at Oppenheimer to Perform from Outperform, Oppenheimer said. Solid quarter but it doesn't get any easier. General Dynamics downgraded at Standpoint from Buy to Hold, Standpoint Research said. Valuation call, as the stock is up 30% since October. Greenhill ( GHL) upgraded at Goldman from Sell to Neutral, Goldman Sachs said. $49 price target. Company is seeing consistent sales and cutting costs. Corning ( GLW) downgraded at Morgan Stanley from Equal-weight to Underweight, Morgan Stanley said. $12 price target. SCP prices are declining. Green Mountain Coffee ( GMCR) rated new Perform at Williams. Valuation call, based on a $50 price target.