NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Harmony Gold Mining Co ( HMY) to 'Buy' from 'Hold'. Net income at this $5.3 billion market cap, gold miner jumped 201% to a profit of $48.4 million compared to the prior fiscal second quarter.

TheStreet Ratings released rating changes on 11 U.S. common stocks for March 21, 2011. In total, five stocks were upgraded and six stocks were downgraded by our stock model.

In the fiscal second quarter, Harmony Gold Mining Co reported $467 million in revenue, an increase of 13.2% compared to the year earlier quarter. Learn more about Harmony Gold Mining Co: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$2.4 billion market cap, REIT, Highwoods Properties Inc ( HIW) was upgraded to 'Buy' from 'Hold'. In fourth quarter results, Highwoods Properties net income flipped to a profit of $10.7 million compared to a loss of 0.9 million in the year earlier quarter. Over the same time period, revenue grew by 4.3% to $121 million. Learn more about Highwoods Properties: 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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