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What is the different between one company's two OTCMKTS symbols?
I have not looked in details but apparently the company has (at least) a dual listing in Hong Kong (its main listing, ticker 700) and in the US (ticker TCTZF). It also has an ADR (TCEHY), the underlying of which is the HK line. The two US listings essentially trade at the same price and will provide very similar returns but a major difference is that TCTZF pays dividends in HKD whereas TCEHY pays its dividends in USD. The latter may be more convenient depending on the account you use to trade the stock. The ADR line is also more liquid.