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How to buy stock on the Toronto Stock Exchange?
You probably bought the cross listed WestJet stock.  If you wanted to buy shares on the TSE, I'd suspect you'd have to find a way to open a brokerage account within Canada and then you'd be able to buy the shares.  However, this could get complicated to some extent as there could be requirements of Canadian tax stuff like a Social Insurance Number that may require some paperwork.  In addition, you'd have to review tax law of both countries to determine how to appropriately report to each country your income as there are various rules around that. TD Waterhouse would be the Canadian subsidiary of TD Ameritrade though I haven't tried to create a Canadian brokerage account.