IEX’s Katsuyama is no flash in the pan

When you watch a commercial for one of the major stock exchanges, you are welcomed into a world of fast-moving, slick images full of glistening buildings, lush crops and happy people. They are typically interspersed with shots of intrepid executives veering out over the horizon as if to say, “I’ve got a long-term vision, and the exchange where my stock is listed is a valuable partner in achieving my goals.” It’s all very reassuring and stylish. But there’s another side to the story.

I have been educated about the realities of today’s stock exchange universe through recent visits with Brad Katsuyama, co-founder and CEO of IEX (a.k.a. The Investors Exchange). If Katsuyama’s name rings a bell, and you don’t work on Wall Street, it’s likely because you remember him as the protagonist of Michael Lewis’s 2014 best-seller, Flash Boys: A Wall Street Revolt, which explored high-frequency trading (HFT) and made the case that the stock market was rigged, really badly.

Five years later, some of the worst practices Lewis highlighted are things of the past, and there are several attributes of the American equity markets that are widely admired around the world. In many ways, though, the realities of

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