Computer breakdowns shook American equity markets again today asmalfunctioning software that feeds data between exchanges promptedNasdaq Stock Market to halt trading in thousands of stocks andoptions.

Nasdaq said trading in shares it lists had been stopped amidissues at its Securities Information Processor, the feed thatdisseminates quotes and prices. The second-biggest stock marketoperator in the U.S. halted transactions in what it calls Tape C,which comprises all Nasdaq-listed securities.

Buying and selling in many of the country's most heavily tradedshares, from Apple Inc. to Intel Corp. and Facebook Inc., ground toa virtual halt as brokers were unable to execute customer orders.The Nasdaq 100 equity index stopped moving shortly after noon,according to data compiled by Bloomberg. The Dow Jones IndustrialAverage, which has Microsoft Corp. and Cisco Systems Inc.,continued to update.

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