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  • Age
  • Title
    Cofounder and CEO
  • Company
    IEX Group

Katsuyama ­became an instant hero to average Joe ­investors when Michael Lewis’s book Flash Boys portrayed his IEX Group—with its alternative trading platform that adds a split-second speed bump to stock orders—as the antidote to front-running by high-frequency traders. His vision became reality this summer when he won SEC approval and officially launched IEX as a national stock exchange alongside the likes of Nasdaq and NYSE. Overall, despite backlash from Wall Street traditionalists, IEX has raised more than $100 million in funding.