Brad Katsuyama is the co-founder and CEO of the Investors Exchange (IEX), which thwarts predatory high-frequency trading (HFT).
HFT uses computers to make many trades in a fraction of a second, which Katsuyama argues is used by some in an unfair way.
Katsuyama and IEX came to prominence as the stars of Michael Lewis' 2014 bestseller "Flash Boys."
IEX will list its first company in October, a major turning point for the exchange.
Katsuyama does not consider himself a natural entrepreneur, but...
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