NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded pSivida Corp ( PSDV) to 'Hold' from 'Sell'. Net income at this $80 million market cap, drug delivery products company reversed course to a profit of $13.1 million from a half million dollar loss in its prior fiscal fourth quarter ending June 30.

TheStreet Ratings released rating changes on 11 additional U.S. common stocks for September 23, 2010. In total, seven stocks were downgraded and five stocks have been upgraded by our stock model.

Fiscal fourth quarter revenue at sSivida Corp increased by a whopping 388% to $15.7 million over the prior fourth quarter. Learn more about sSivida: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

While Scholastic Corp ( SCHL) had recently been upgraded by our model on improved earnings expectations, the actual fiscal first quarter results reversed our model's opinion on the shares to 'Hold' from 'Buy'. Fiscal first quarter net loss increase to $35.2 million from a year ago loss of $23 million. Over the same period encompassing summer vacation from U.S. schools, revenue contracted by 7.8% to $290.9 million. Learn more about Aetna: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

-- Reported by Kevin Baker in Jupiter, Fla.

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Kevin Baker became the senior financial analyst for TheStreet Ratings upon the August 2006 acquisition of Weiss Ratings by, 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.