Nasdaq OMX Group halted trading Friday morning at one of its three options markets. The exchange operator said in a notice to traders it halted trading on its Nasdaq Options Market, known as NOM, at 10:56 a.m. EDT. The halt came after an alert earlier in the morning that Nasdaq was investigating some issues at that exchange.
Nasdaq OMX's other two options exchanges were operating normally, as was the exchange operator's equities marketplace, according to a spokesman. Nasdaq is investigating the issue, he said.
NOM is Nasdaq's second-largest options venue, with 8.1% of industry trading volume in October. That makes it the sixth-largest of 12 U.S. options exchanges.
Write to Kaitlyn Kiernan at Kaitlyn.Kiernan@wsj.com
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