Subscriber means any person that has entered into a contractual agreement with an alternative trading system to access such alternative trading system for the purpose of effecting transactions in securities or submitting, disseminating, or displaying orders on such alternative trading system, including a customer, member, user, or participant in an alternative trading system. A subscriber, however, shall not include a national securities exchange or national securities association.


17 CFR § 242.300

Scoping language

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