Brad Katsuyama quotes:

The people who watch a movie like 'Wolf of Wall Street' and want to work on Wall Street are exactly the kind of people who shouldn't.

When we had the 'flash crash' in 2010, where the price of some stocks briefly fell to zero, high-frequency trading played a big role in that event.

We built a market at IEX that does not sell certain types of technology advantages to high-frequency traders, and as a result, the high-frequency traders that didn't rely on buying those advantages trade on IEX.

Society has changed so dramatically that it's empowered the individual, and technology has a lot to do with that. Years ago, if you had a bad experience at a restaurant, you could complain to the manager. Maybe you could picket. Now, you go online and write a review that may go viral.

Anyone with a pension or retirement is an investor in the stock market.

It is easier to disrupt consumer finance. It is much harder to disrupt institutional finance, Wall Street. It is very heavily regulated, and because it is institutional finance, you are dealing with incumbents.

I didn't have this rebellious streak in me. To me, I'm a product of circumstance.

My personality and nothing from my past would have ever predicted that I would be at the center of a controversy.

Once you realize that there are only certain points which you are willing to negotiate, it makes the negotiation much simpler.

I am a fairly go-with-the-flow guy. Don't get me wrong, I have convictions.