NEW YORK ( TheStreet) -- CHANGE IN RATINGS Abercrombie & Fitch ( ANF) downgraded to hold at TheStreet Ratings. Atlas Air ( AAWW) downgraded at Dahlman from Buy to Hold, Dahlman Rose said. Valuation call as earnings momentum is slowing. Ancestry.com ( ACOM) downgraded at BofA/Merrill to Neutral, Bank of America/Merrill Lynch said. Growth appears to be decelerating. $31 price target. Amazon.com ( AMZN) downgraded at Morgan Stanley from Overweight to Equal-weight, Morgan Stanley said. Company is going through a business shift and is facing increased operating risks. Comcast ( CMCSA) downgraded at Argus from Buy to Hold, Argus said. Valuation call, as NBC Universal will likely continue to drag on business. Deere ( DE) downgraded at Wells from Outperform to Market Perform, Wells Fargo said. Company is leveraged to lower farm cash flow. Incyte ( INCY) downgraded at Morgan Stanley from Overweight to Equal-weight, Morgan Stanley said. Valuation call, based on a $16 price target. Itron ( ITRI) upgraded at Baird from Neutral to Outperform, Robert Baird said. $53 price target. Company posted a strong quarter and has several potential near-term catalysts. Itron upgraded at ThinkEquity from Hold to Buy, ThinkEquity said. $47 price target. Company is restructuring and building operating momentum. Nvidia ( NVDA) downgraded at BofA/Merrill from Buy to Neutral, Bank of America/Merrill Lynch said. Estimates also cut, as the company is facing increased competition. $16.50 price target. Petrobras ( PBR) downgraded at Societe Generale from Buy to Hold, Societe Generale said. $31 price target. Downstream business remains a drag. Pulte Homes ( PHM) downgraded at UBS to Neutral from Buy, UBS said. $9 price target. Improvements priced in. Ralph Lauren ( RL)upgraded at Argus from Hold to Buy, Argus Research said. $202 price target. Company is expanding its geography and new products are driving growth. Select Medical ( SEM) downgraded at JMP from Outperform to Market Perform, JMP Securities said. Doc Fix bill may not help the company Cimarex Energy ( XEC)downgraded at Canaccord to Hold, Canaccord Genuity said. $84 price target. Valuation call, as the company is facing higher near-term costs.