NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Woori Finance Holdings ( WF) to 'Hold' from 'Sell'. Net income at this $10.9 billion market cap, Korean Bank grew 9.1% to a profit of $477 million in the third quarter compared to the same quarter last year.

TheStreet Ratings released rating changes on 15 U.S. common stocks for January 7, 2011. In total, 10 stocks were upgraded and five stocks were downgraded by our stock model.

In the third quarter, Woori Finance Holdings reported $4.2 billion in revenue, an increase of 4.4% over the year earlier quarter. Learn more about Woori Finance Holdings: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$1.3 billion market cap, natural gas distributor, Northwest Natural Gas Co ( NWN) was downgraded to 'Hold' from 'Buy'. In third quarter results, Northwest Natural Gas reported a larger loss of $7.4 million compared to a loss of $6.7 million in the same quarter last year on an 18.7% decline in revenue to $95.1 million. Learn more about Northwest Natural Gas Co: 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, 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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