NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Sterling Construction Co ( STRL) to 'Buy' from 'Hold'. Net income at this $262 million market cap, infrastructure company leapt 1132% to a profit of $9.4 million compared to the prior fourth quarter.

TheStreet Ratings released rating changes on seven U.S. common stocks for March 25, 2011. In total, two stocks were upgraded and five stocks were downgraded by our stock model.

In the fourth quarter, Sterling Construction Co reported $138 million in revenue, an increase of 92.5% compared to the year earlier quarter. Learn more about Sterling Construction Co: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

$41.6 million market cap, specialty chemicals company, TOR Minerals Intl Inc ( TORM) was upgraded to 'Buy' from 'Hold'. In fourth quarter results, TOR Minerals Intl bottom grew by 532% to a profit of $1.0 million compared to the year earlier quarter. Over the same time period, revenue increased by 35.9% to $8.7 million. Learn more about TOR Minerals Intl: 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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