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How to buy stock on the Toronto Stock Exchange?
While most all Canadian brokers allow us access to all the US stocks, the reverse is not true.  But some US brokers DO allow trading on foreign exchanges. (e.g. Interactive Brokers at which I have an account).  You have to look and be prepared to switch brokers.  Americans cannot use Canadian brokers (and vice versa). Trading of shares happens where-ever two people get together - hence the pink sheets.  These work well for Americans who want to buy-sell foreign stocks using USD without the hassle of FX conversions.  You get the same economic exposure as if the actual stock were bought.   But the exchanges are barely policed, and liquidity can dry up, and FX moves are not necessarily arbitraged away by 'the market'.  You don't have the same safety as ADRs because there is no bank holding any stash of 'actual' stocks to backstop those traded on the pink sheets.