IEX Welcomes High-Speed Traders, as Long as They Behave

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IEX Group Inc.’s trading platform was built to combat predatory practices. That doesn’t mean it’s on a crusade to kill high-frequency trading firms.

Chief Executive Officer Brad Katsuyama, whose firm is the subject of Michael Lewis’s new book “Flash Boys,” welcomes all kinds of traders on his five-month-old platform that’s trying to reshape the $22 trillion U.S. equity market. Virtu Financial Inc., one of the biggest high-speed trading firms, trades on IEX, for instance.