Brad Katsuyama never considered himself a maverick, or entrepreneur. He had a cushy job at the Royal Bank of Canada, but he became alarmed the more he learned about high frequency trading, where computers can trade a bunch of stocks in a fraction of a second. He felt so strongly that it was harming the market that he left to create his own exchange – the Investor’s Exchange – where this type of trading is prohibited. Investors can trade stocks from other exchanges on IEX, with the idea that it’s a level playing field. As CEO, Katsuyama has become the face of IEX, and became the face of the bestselling book "Flash Boys," by Michael Lewis.

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