NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Coventry Health Care ( CVH) to 'Buy' from 'Hold'. Net income at this $5 billion market cap, managed healthcare company grew by 13.3% to a profit of $110 million compared to in the prior first quarter.

TheStreet Ratings released rating changes on 28 U.S. common stocks for April 29, 2011. In total, 17 stocks were upgraded and 11 stocks were downgraded by our stock model.

In the first quarter, Coventry Health Care reported $3 billion in revenue, an increase of 6.6% compared to the year earlier quarter. Learn more about Coventry Health Care: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$415 million market cap, printed products company, InnerWorkings ( INWK - Get Report) was upgraded by our stock model to 'Buy' from 'Hold'. In fourth quarter results, InnerWorkings net profit of $3.5 million topped the year earlier quarter by 61.9%. Over the same time period, revenue gained 20.9% to $130 million. Learn more about InnerWorkings: 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 equity and mutual fund ratings. 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.