NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Lockheed Martin Corp ( LMT) to 'Buy' from 'Hold'. Net income at this $28.5 billion market cap, aerospace defense contractor grew 18.9% to $983 million in the fourth quarter compared to the year earlier quarter.

TheStreet Ratings released rating changes on 20 U.S. common stocks for January 27, 2011. In total, 14 stocks were upgraded and six stocks were downgraded by our stock model.

In the fourth quarter, Lockheed Martin Corp reported $12.8 billion in revenue, an increase of 4.8% compared to the year earlier quarter. Learn more about Lockheed Martin Corp: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$3.7 billion market cap, university group, DeVry Inc ( DV) was upgraded to 'Buy' from 'Hold'. In fiscal second quarter results, DeVry turned in a profit of $88.7 million, an increase of 22.4% when compared to the year earlier quarter. Over the same time period, revenue grew by 16.6% to $552 million. Learn more about DeVry Inc: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

-- Reported by Kevin Baker in Jupiter, FL.

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Kevin Baker became the senior financial analyst for TheStreet Ratings upon the August 2006 acquisition of Weiss Ratings by TheStreet.com, covering mutual funds. He joined the Weiss Group in 1997 as a banking and brokerage analyst. In 1999, he created the Weiss Group's first ratings to gauge the level of risk in U.S. equities. Baker received a B.S. degree in management from Rensselaer Polytechnic Institute and an M.B.A. with a finance specialization from Nova Southeastern University.

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