NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Affiliated Managers Group ( AMG) to 'Buy' from 'Hold'. Net income at this $5.2 billion market cap, investment manager jumped 91.1% to a profit of $34 million in the third quarter compared to the year earlier quarter.

TheStreet Ratings released rating changes on six U.S. common stocks for January 24, 2011. In total, five stocks were upgraded and one stock was downgraded by our stock model.

In the third quarter, Affiliated Managers Group reported $354.4 million in revenue, an increase of 63% compared to the year earlier quarter. Learn more about Affiliated Managers Group: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$576 million market cap, physicians group, IPC The Hospitalist Co Inc ( IPCM) was upgraded to 'Buy' from 'Hold'. In third quarter results, IPC The Hospitalist Co turned in a profit of $6.1 million, a gain of 31.3% compared to the year earlier quarter. Over the same time period, revenue grew by 17.3% to $90.9 million. Learn more about IPC The Hospitalist 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 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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