NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded General Dynamics Corp ( GD) to 'Buy' from 'Hold'. Net income at this $26.9 billion market cap, weapons system company grew 13.6% to a profit of $650 million in the third quarter compared to the same quarter last year.

TheStreet Ratings released rating changes on nine U.S. common stocks for January 8, 2011. In total, four stocks were upgraded and five stocks were downgraded by our stock model.

In the third quarter, General Dynamics reported $8.0 billion in revenue, an increase of 3.8% over the year earlier quarter. Learn more about General Dynamics: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$349 million market cap, entertainment content distributor, CKX Inc ( CKXE) was downgraded to 'Sell' from 'Hold'. In third quarter results, CKX Inc reported a loss of $1.9 million compared to a gain of $11.7 million in the same quarter last year on an 8.3% decline in revenue to $80.1 million. Learn more about CKX 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, 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.