NEW YORK ( TheStreet) -- CHANGE IN RATINGS Accretive Health ( AH) was downgraded to Sell at TheStreet Ratings. Dolby ( DLB) was downgraded at JP Morgan from Overweight to Neutral. Company lacks near-term catalysts, JP Morgan said. $48 price target. Extra Space Storage ( EXR) was downgraded at Jefferies to Hold from Buy. Valuation hard to ignore, Jefferies said. General Growth ( GGP) was upgraded at UBS to Buy from Neutral. $20 price target. Estimates were also increased on multiple near-term catalysts, UBS said. Human Genome ( HGSI) was downgraded at Leerink Swann to Market Perform. See little upside potential to Glaxo's hostile bid, Leerink Swann said. Highwood Properties ( HIW) was downgraded at Jefferies to Hold from Buy. $36 price target. Valuation now reflects fundamentals, Jefferies said. Harsco ( HSC) was upgraded at Keybanc from Hold to Buy. $27 price target. Management change should improve shareholder value, Keybanc said. Martin Marietta ( MLM) was downgraded at RBC Capital to Sector Perform. Valuation call, based on a $99 price target, RBC Capital said. 3M ( MMM) was downgraded at Bernstein from Outperform to Market Perform. $101 price target. Company is trying to balance between growth and margins, Bernstein said. Vail Resorts ( MTN) was downgraded at Wells Fargo from Outperform to Market Perform. Company lacks near-term catalysts, Wells Fargo said. Oracle ( ORCL) was downgraded at ThinkEquity from Buy to Hold. $28 price target. New analyst believes that the company lacks near-term catalysts, ThinkEquity said. Pros Holdings ( PRO) was downgraded to Hold at TheStreet Ratings. Prudential ( PRU) was upgraded at Credit Suisse from Equal-Weight to Overweight. Valuation call, based on a $66 price target, Credit Suisse said. Teva Pharmaceutical ( TEVA) was downgraded at Needham from Strong Buy to Hold. Company is posting lower sales and withdrew its guidance, Needham said. Marriott Vacations ( VAC) was upgraded at Goldman Sachs from Neutral to Buy. Valuation call, based on a $38 price target, Goldman Sachs said.