ES Journal Archive (2011)

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Dumb question:

I just went to finviz and summed the volume of all S&P 500 companies trading today, and their combined volume is:

1,813,034,440

Yet, CNBC reports just over 300,000,000 for the volume today on the S&P. So, is the volume on the cash index reported differently than just the sum of the volume of the stocks trading in it?
 
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