CME own SP500 cash index?

M

maxima120

Before you jump to a conclusion I want to stress the question is about cash index.

I just stumbled upon this page: http://www.cmegroup.com/trading/equity-index/settlement.html

Which says: "On typical days, CME Group begins disseminating index values immediately at 8:30 a.m. Central Time (CT). "

Does this mean CME have their own SP500 calculation? Does this mean they stream it to the users?

If I am not being crazy and the answers are yes/yes... then what data feed re-sells it?

(I was always under impressing that someone 'authorized' by S&P desseminates an 'official' version of it with frequency like 1 tick per 15 sec)...
 
CME has had S&P 500 cash index with symbol INX since 1982.

CBOE's SPX started with S&P 500 options in 1983.

It is also calculated by different vendors.
 
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