the root symbol and adding the expiration month letter (the same as for futures) and the last digit of the expiration year. For example, the E-mini S&P 500 expiring in December 2012 has the symbol ESZ2.

E-mini contracts

The table below lists some of the more popular E-mini contracts, with the initial and maintenance margins required by CME. Note that individual brokers may require different margin amounts (also called performance bonds).

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