NEW YORK ( TheStreet) -- CHANGE IN RATINGS Blackstone was initiated with a Buy rating at Stifel Nicolaus. $20 price target. Alternative investment strategies continue to attract assets, Stifel Nicolaus said. CH Robinson ( CHRW) was upgraded at Deutsche Bank from Hold to Buy. Valuation call, based on a $79 price target, Deutsche said. Comerica ( CMA) was downgraded at BMO from Outperform to Market Perform. Valuation call, based on a $36 price target, BMO said. Cree ( CREE) was downgraded at ThinkEquity from Buy to Hold. $30 price target. Estimates also cut, given the company's new guidance, ThinkEquity said. Deckers Outdoor ( DECK) was upgraded at Sterne Agee to Neutral. Valuation call, as the stock is down 30% since December, Sterne Agee said. Dun & Bradstreet ( DNB) was downgraded at JP Morgan from Neutral to Underweight. $75 price target. Company lacks near-term catalysts, JP Morgan said. First Solar ( FSLR) was downgraded at Wunderlich from Hold to Sell. $14 price target. Company is making a material change to its strategy, Wunderlich said. First Solar was upgraded from Sell to Hold at Cantor Fitzgerald. Valuation call, based on a $21.50 price target, Cantor said. Global Sources ( GSOL) was upgraded to Buy at TheStreet Ratings. Molycorp ( MCP) was upgraded to Hold at TheStreet Ratings. Walter Energy was initiated with a Buy rating at Bank of America/Merrill Lynch. $75 price target. Company has less energy exposure than its peers, BofA/Merrill Lynch said.