Citadel has asked the U.S. Supreme Court to hear a case between Chicago Board Options Exchange and Deutsche Boerse-owned International Securities Exchange over rules that restrict where certain index options can be traded. "[A]s long as the CBOE or any given exchange can maintain exclusive listings of important derivatives like index options, competitive pressure will not be strong enough to motivate those exchanges to adopt pro-investor technologies," Citadel argues in a court filing.

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