> HFT companies managed to avoid using this exchange very successfully. You mean they didn't accidentally trade on IEX? That's not surprising. Also, I would

> HFT companies managed to avoid using this exchange very successfully. You mean they didn't accidentally trade on IEX? That's not surprising. Also, I would believe that if you're doing pure latency arb, then trading on IEX isn't profitable, but there are other high-frequency strategies besides pure latency arb. Are you restricting your definition of HFT to pure latency arb strategies?