From IB website:
2001 The group's global retail, institutional and proprietary trading volume combined now exceeds 200,000 trades per day. <b>Interactive Brokers (U.K.) Limited and Interactive Brokers Canada, Inc. are formed to expand IB's activities in Europe and Canada. In recognition of the increasing scope and importance of the Interactive Brokers direct-access brokerage businesses, the corporate name of the Timber Hill Group is changed to The Interactive Brokers Group."
looks like IB is already registered in Canada. This is confusing.