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Nasdaq’s Second Error of Day Hobbled Service Dark Pools Use

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A Nasdaq OMX Group Inc. service that some dark pools need in order to function broke down twice Tuesday, hobbling part of the U.S. stock market.

The first outage in the Nasdaq TRF lasted from the start of trading at 9:30 a.m. through 9:42 a.m. New York time, according to spokesman Joseph Christinat. The second was from about 12:57 p.m. to 1:35 p.m., according to the exchange’s website.