NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Diodes Inc ( DIOD) to 'Buy' from 'Hold'. Net income at this $1.1 billion market cap, semiconductor manufacturer rose 201% to $21.2 million in the fiscal third quarter as compared to the same quarter last year. TheStreet Ratings released rating changes on 13 U.S. common stocks for November 23, 2010. In total, 7 stocks were downgraded and 6 stocks have been upgraded by our stock model. In the third quarter, gross revenue at Diodes increased by 33.6% to $163.1 million over the prior third quarter. Learn more about Diodes Inc: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings. $239 million market cap, supercomputer manufacturer, Cray Inc ( CRAY) was downgraded to 'Sell' from 'Hold'. In third quarter results for Cray, gross revenue fell 26.9% to $42.8 million. The company also reported a loss of $18.8 million in the quarter, a significant increase over the loss of $2.1 million reported in the same quarter a year ago. Learn more about Cray Inc: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings. -- Reported by Chris Stuart in Boston, MA. For additional Investment Research check out our Ratings Research Center.