The Chicago Board Options Exchange is responding to its second trading delay in a week by bringing in an independent consultant to review technology practices at the exchange. Trading in some stock options hosted on a CBOE-run server opened 10 minutes late on Thursday. Executives at CBOE attributed the issue to a "product maintenance function" that was updated as part of the preparation for expanded trading hours. "We are committed to extended trading hours, and this review will result in a comprehensive evaluation of our rollout procedures and provide guidance going forward," according to CBOE officials.

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