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I am putting all the stock symbols in the database and would like to know if the symbols are unique between Amex/Nasdaq/NYSE/TSE (Toronto stock exchange)

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Stock symbols are issued by the exchange that the stock is listing on.

If a company is listed on multiple exchanges, their stock may or may not have the same symbol across those exchanges.

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  • Example: DHC. Had some fun tracking it down. Deer Horn is a mining company with a ticker of DHC but if you try to find it by DHC you usually find something else.
    – Joshua
    Feb 28 at 3:56
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Not across the international border. E.g. AC is Air Canada on the TSX and Associated Capital Group on the NYSE.

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