Update: OPRA Data Issue Halts Options Exchanges

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OPRA had begun the software upgrade—which was designed to improve message processing efficiency—on Friday, Sept. 13 in a phased rollout. However, during the process on Monday, the OPRA SIP (Securities Information Processor) discovered that duplicate quotes were being generated for some securities, which would have affected calculation of the NBBO.

To fix the problem, OPRA notified exchange participants and the Securities and Exchange Commission, then rolled back to the previous version of the so

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