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NEW YORK (TheStreet) -- GT Solar International( SOLR) was popping 12.7% to $13.10 in premarket trading Tuesday after the Merrimack, N.H.-based provider of production equipment and materials for the solar and LED markets blew past Wall Street's expectations for its fiscal fourth quarter and boosted its forecast for fiscal 2012.

HiSoft International

( HSFT) was surging 6.5% to $14.49 after the China-based information technology services provider said

revenue rose more than 45% year over year in its fiscal first quarter.

Electronics firm



said Tuesday that its music Web site in Greece

has been hacked

affecting 8,500 user accounts. Still, shares were up 4.2% to $27.70 in premarket trading Tuesday.

Shares of


(AZO) - Get Free Report

were rising 3.7% to $287 after the automotive replacement retailer posted third-quarter profit of $5.29 vs. the average analyst expectation of $4.98 a share.

Medical technology company


(MDT) - Get Free Report

reported fourth-quarter non-GAAP profit of 90 cents a share vs. the consensus target of 92 cents a share. Shares were falling 2.5% to $40.25.


AK Steel

(AKS) - Get Free Report

were rising 1.9% to $14.35 after the steel products producer announced a price increase for its carbon steel products. Base prices will increase by $50 a ton for hot-rolled and cold-rolled carbon steel products and by $60 a ton for coated carbon steel products.

Barrick Gold


was rising 0.7% to $45.86 following reports that Zambia will permit the producer to buy the Lumwana copper mine in connection with its $7.5 billion purchase of

Equinox Minerals





Semiconductor service company

Applied Materials

(AMAT) - Get Free Report

is expected to post second-quarter profit of 37 cents a share on Tuesday. Shares were up 0.4% to $13.85.


American International Group's

(AIG) - Get Free Report

$9 billion stock offering

is expected to price late Tuesday, according to reports. Shares were trading sideways at $30.

Russian search engine company


(YNDX) - Get Free Report

is expected to begin trading on


under the symbol YNDX Tuesday. The IPO priced at $25 a share, which was better than expected.

J.M. Smucker

(SJM) - Get Free Report

increased prices for the majority of its coffee products sold in the U.S. by 11% on average.

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-- Written by Andrea Tse in New York.

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