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Why would a company have 2 listings on the same exchange?
A company can issue different kinds of shares. For example, some kinds of shares may get preference in dividends or payment in event of (company) bankruptcy. Preferred shares are an example of this. A company might have several kinds of preferred shares and a 'common stock'. Here is a good explanation. See too the Wikipedia article about preferred stock. Toronto-Dominion Bank (TD) is an example of a company that has fourteen different preferred share issues, each with its own listing on the Toronto Stock Exchange (TSE) and symbol. TD has one kind of common stock, which is also listed on the TSE. However, TD common equity trades much more actively than the preferred shares. Remember that preferred stock is a different security type than common stock e.g. common has voting rights, preferred does not.