NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded BP Plc ( BP) to 'Buy' from 'Hold'. Net income at this $150.3 billion market cap, oil exploration and production company grew by 29.6% to $5.6 billion in the fourth quarter compared to the year earlier quarter.

TheStreet Ratings released rating changes on 16 U.S. common stocks for February 1, 2011. In total, nine stocks were upgraded and seven stocks were downgraded by our stock model.

In the fourth quarter, BP reported $79.7 billion in revenue, an increase of 12.3% compared to the year earlier quarter. Learn more about BP Plc: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$179 million market cap, wireless chipset company, DSP Group Inc ( DSPG) was downgraded to 'Sell' from 'Hold'. In fourth quarter results, DSP Group expanded its loss to $8.8 million from a loss of $2.9 million in the year earlier quarter. Over the same time period, revenue shrank by 20.7% to $43.4 million. Learn more about DSP Group: 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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