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.
Chris Stuart, CFA, equity research manager, joined TheStreet.com Ratings after working as a senior investment analyst with Merrill Lynch, covering Small Cap Equity and Alternative investment strategies. Prior to that, Chris gained analytical and investment experience, working for One Beacon Insurance as an Actuarial Analyst, and H&R Block as a Financial Advisor. He earned his Bachelor's degree in Finance from the University of Massachusetts Amherst. He holds a Chartered Financial Analyst (CFA) designation, and is a member of the Boston Security Analysts Society (BSAS) and the CFA Institute.

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