It depends on what you mean by HFT, if you mean prop trading, that was made illegal by Dodd Frank for large cap businesses to engage in with investor funds. If

It depends on what you mean by HFT, if you mean prop trading, that was made illegal by Dodd Frank for large cap businesses to engage in with investor funds. If you mean market making HFT (which some prop firms also do), that's what this article is about.