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Why for some classes does the volume on the OptSum file not always add up to what is published by the OCC (Options Clearing Corp)?

April 26, 2017classes clearing Corp file OCC Options optsum published volume

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Why for some classes does the volume on the OptSum file not always add up to what is published by the OCC (Options Clearing Corp)?

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The data published by the OCC is cleared volume and also includes volume from other options exchanges. The OptSum data is reported rather than cleared volume and is restricted to CBOE volume at this time.