NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Greatbatch Inc ( GB) to 'Buy' from 'Hold'. Net income at this $566 million market cap, medical technology company rose by 62.6% to $38.9 million in the third quarter compared to the same quarter last year.

TheStreet Ratings released rating changes on 14 U.S. common stocks for December 20, 2010. In total, 13 stocks were upgraded and one stock was downgraded by our stock model.

In the third quarter, Greatbatch reported $127.5 million in revenue, a rise of 5% over the year earlier quarter. Learn more about Greatbatch: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$365 million market cap, commercial bank, Union First Market Bankshares ( UBSH) was upgraded to 'Buy' from 'Hold'. In third quarter results, Union First Market Bankshares reported a 50.4% increase in revenues to $60.8 million and a 187.8% increase in net income to $8.1 million compared to the same quarter last year. Learn more about Union First Market Bankshares: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

-- Reported by Kevin Baker in Jupiter, FL.

For additional Investment Research check out our Ratings Research Center.

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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