NEW YORK ( TheStreet) -- CHANGE IN RATINGS:Autodesk ( ADSK) upgraded at Goldman from Sell to Buy, Goldman Sachs said. Company was also placed on the Conviction Buy list. $45 price target. Company is leveraged to an improving commercial construction market. Alliant Techsystems ( ATK) downgraded at FBR from Outperform to Market Perform, FBR Capital Markets said. Valuation call. Banner ( BANR) downgraded at DA Davidson from Buy to Neutral, DA Davidson said. Valuation call, based on a $35 price target. Briggs & Stratton ( BGG) upgraded to buy at TheStreet Ratings. CBOE ( CBOE) upgraded to buy at TheStreet Ratings. CF Industries ( CF) upgraded at Dahlman from Hold to Buy, Dahlman Rose said. Industry should see positive newsflow heading into the Spring Application season. Cypress Semiconductor ( CY) downgraded at Wunderlich from Buy to Hold, Wunderlich said. $10 price target. Company lacks near-term catalysts. eBay ( EBAY) upgraded at Bernstein from Market Perform to Outperform, Bernstein said. $65 price target. Estimates also boosted, as new initiatives will drive growth. Flextronics ( FLEX) downgraded at UBS to Neutral from Buy, UBS said. $7 price target. Execution challenges persist. Goldman Sachs ( GS) downgraded at Deutsche from Buy to Hold, Deutsche Bank said. Valuation call, as the stock is up 50% since August. Goldman Sachs downgraded at Citigroup to Neutral from Buy, Citigroup said. $150 price target. Valuation call. Janus ( JNS) downgraded at Credit Suisse from Neutral to Underperform, Credit Suisse said. $8 price target. Company will likely see lower asset inflows. Janus Capital Group downgraded at Citigroup to Sell from Neutral, Citigroup said. $7.75 price target. Structural and valuation issues. JP Morgan ( JPM) upgraded at Deutsche from Hold to Buy, Deutsche Bank said. $53 price target. Company is leveraged to a rebound in consumer loan growth and trades at a discount to its peers. KLA-Tencor ( KLAC) upgraded at Deutsche from Sell to Hold, Deutsche Bank said. $56 price target. Company has a strong balance sheet and dominant market position. Medtronic ( MDT) downgraded at Wunderlich from Buy to Hold, Wunderlich said. Valuation call, as the stock is up 13% year-to-date. Noble Corp ( NE) downgraded at Jefferies to Hold from Buy, Jefferies said. $41 price target. 2013 guidance is poor.