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OEX options volume do not add up


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#1 Pricewatcher

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Posted 20 January 2010 - 05:43 AM

Lately I have been following the OEX options volume on CBOE.

Everyday CBOE publishes intraday volume on: http://www.cboe.com/...ntraDayVol.aspx

End of Day volume is published on: http://www.cboe.com/...ntraDayVol.aspx on page 2.

I never can get the intraday volume to add up to the end of day volume. E.g. for Tuesday January 19 the EOD OEX put volume was 18,173. If I look at the intraday volume for January 19 and add together every half hour recording of the put volume for OEX I get a volume of 106,313.

What am I doing wrong?