NEW YORK (

TheStreet

) -TheStreet Ratings' stock model upgraded

Bottomline Technologies

(EPAY) - Get Report

to 'Buy' from 'Hold'. Net income at this $511 million market cap, electronic invoice and payment company flipped to a $1.1 million profit from a loss of $12.3 million in the prior fiscal fourth quarter.

TheStreet Ratings released rating changes on 21 additional U.S. common stocks for October 14, 2010. In total, just one stock was downgraded and 21 stocks have been upgraded by our stock model.

Fiscal fourth quarter revenue at Bottomline Technologies grew by 18.9% to $41.5 million over the prior fourth quarter. Learn more about Bottomline Technologies:

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Another high tech company, this one developing algae related nutritional products,

Martek Biosciences

(MATK)

was upgraded to 'Buy' from 'Hold'. Net income popped 33.1% to a profit of $11.9 million in the third quarter when compared to the prior third quarter. Over the same period, revenue grew by a nice 50.5% to $117.2 million. Learn more about Martek Biosciences:

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-- 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 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.