Nasdaq OMX Group Inc said on Tuesday that Nasdaq Options and Nasdaq OMX BX Options will review all trades between 9:30 a.m. EDT and 9:47 a.m. EDT.
Also, exchange operator CBOE Holdings Inc said it is reviewing all trades on the Chicago Board Options Exchange and its C2 electronic venue from 08:30 to 08:41 a.m. Chicago time, according to the CBOE website. The trades under review may be adjusted or nullified, according to the website.
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A CBOE spokeswoman said it has been operating with no interruptions.
Calls to the Nasdaq for comment were not immediately returned. Nasdaq Options and Nasdaq OMX BX Options said it was taking requests for "an error review" on those trades until 11:30 a.m. EDT.
(The story corrects to show CBOE trade review start time at 8:30 a.m., not 3:30)
(Reporting by Chuck Mikolajczak, Doris Frankel and Caroline Valetkevitch; Editing by Chizu Nomiyama and Nick Zieminski)