NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Citigroup Inc ( C) to 'Hold' from 'Sell'. Net loss at this $139 billion market cap, global financial services company flipped to a profit of $1.3 billion in the fourth quarter compared to a loss of $7.6 billion in the year earlier quarter.

TheStreet Ratings released rating changes on 13 U.S. common stocks for January 18, 2011. In total, 11 stocks were upgraded and two stocks were downgraded by our stock model.

In the fourth quarter, Citigroup reported $24.4 billion in revenue, an increase of 11.1% over the year earlier quarter. Learn more about Citigroup: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$17.3 billion market cap, software company, Adobe Systems Inc ( ADBE) was upgraded to 'Buy' from 'Hold'. In fourth quarter results, Adobe Systems turned in a profit of $268.9 million after losing $32.0 million in the year earlier quarter. Over the same time period, revenue grew by 33.1% to $1.0 billion. Learn more about Adobe Systems: 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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