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The great majority of CME Group futures contracts are executed on the electronic Globex platform but the situation is just the opposite for options on futures. The majority of options-on-futures are executed on the trading floor via open outcry.
96% of all CME Group futures contracts are executed on Globex; 4% by open outcry.
16% of all CME Group options on futures are executed on Globex; 84% by open outcry.