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Chicago Speed Trader Allston Withdraws From U.S. Stock Market

High-frequency trading firm Allston Trading LLC has stopped operating in the U.S. stock market.

Allston, founded more than a decade ago by futures traders Bob Jordan, Elrick Williams and John Harada, exited the business after deciding to focus on more profitable trading in derivatives markets, according to Dave Lundy, a spokesman for the Chicago-based company.