(Bloomberg)--New York Attorney General Eric Schneiderman sent subpoenas to six high-frequencytrading firms seeking information about special arrangements they have with exchanges and dark pools as well as their trading strategies, according to a person familiar with the matter.

Chopper Trading LLC, Jump Trading LLC and Tower Research Capital LLC are among the firms, according to the person, who asked to not be named because the details of the investigation haven’t been made public.

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