Electronic trading resumes at CBOE

The CBOE’s open outcry floor and electronic platform usually run simultaneously, between 08:30 and 15:00 local time. Electronic trading ceased at 11:10 Friday, forcing option trades solely onto the physical exchange and disrupting the Chicago Futures Exchange, the CBOE’s wholly electronic subsidiary.

An exchange spokesman said trading volume for the day was 1.8 million orders, a third lower than the daily average for the year to date. Around 95% of the CBOE’s orders are normally executed electronically, although floor trading still accounts for a third of its total volume. Earlier last week, electronic trading on the London Metal Exchange was also disrupted for almost two full trading days, following a failure caused by an upgrade. (See: LME rolls back Select after upgrade fault)

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