A form that is filed with the SEC by alternative trading systems. SEC Form ATS-R details the alternative trading systems' quarterly activities and must be filed within 30 days of the end of each calendar quarter. Activity disclosed includes both the unit and dollar volume of trades in all types of securities.


An alternative trading system is a system or organization which provides a market place for buyers and sellers of securities. It essentially performs the function of a stock exchange, but does not set rules governing the conduct of its subscribers.

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