Quote from DmanX:
That is correct. Trades on Globex only.
But they are fungible with the S&P big contract which you could trade open out cry. 5 ES are worth 1 SP.
Likely though, if Globex went down in a catastrophic manner, they would suspend open out cry also.
Globex rarely goes down for technical issues and when it does it's not for long.
And if you're thinking 9/11, exchanges don't close without warning. And on that day, they closes the exchanges right at the open give or take 2 minutes.
Quote from fluttrader:
How much time was the warning given before they closed down ?
Quote from jjf:
Thanks DmanX. So if the CME closes for any reason, is it fair to assume it will re-open at more or less the same price.