NEW YORK (Reuters) - Nasdaq OMX Group Inc
Also, exchange operator CBOE Holdings Inc
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 changes Eastern Standard time (EST) to Daylight time (EDT)
(Reporting by Chuck Mikolajczak, Doris Frankel and Caroline Valetkevitch; Editing by Chizu Nomiyama and Nick Zieminski)