[kasey_junk]

To be fair, Flash Boys is a book where the main beneficiaries have a vested interest in portraying HFT and especially cross market arbitrage as predatory.

Further, themis trading has a vested interest in portraying HFT and especially cross exchange market making as predatory. Both groups work for market participants that want to move large amounts of shares without impacting the price. That is they want to subvert supply and demand. Their particular quote does a disservice to every one because it equates pricing demand into the market as front-running, which is ludicrous.

Full disclosure, I have worked in the HFT industry (though I don't now). Regardless of whether HFT is predatory or not, Flash Boys inaccurately portrays how the technical details of exchanges work. I do not, and have met no person who is aware of the technical details of the markets who finds it credible.

[dmschulman]

Granted, Flash Boys is positive publicity for Brad Katsuyama and IEX and much of what Brad and his team uncover is through hypothesizing, testing, and inference, no one in HFT comes out to confirm if these ideas are correct or not.

While the technical details of the system might be up for debate, Flash Boys paints a broader picture of a broken global financial marketplace, run by institutions struggling to keep up with new technology and unable to craft good regulatory policy. A system gamed by investment firms (or more accurately, investment intermediaries like HFTs) whose advantage comes from exploiting these poor regulations and new technologies, creating market imbalances that affect the entire marketplace and generate incredible profits at the detriment of the investors to whom these firms have a fiduciary responsibility to.

The broader picture of a screwed up financial system, how it got this way, and who it serves was my biggest take away from Flash Boys.

[kasey_junk]

If you read carefully you will notice noone in HFT is ever offered a chance to speak about the issues. That is extremely telling.

There are 2 major forces in the markets, on one side are market neutral participants that are not taking a position long term. For the most part they are market makers selling liquidity.

On the other are large block traders, largely hedge funds who want to take advantage of that liquidity at the cheapest price.

Those 2 groups are naturally hostile to each other. Flash Boys presents, potentially in bad faith, only 1 side of that equation.

For instance, that you think the profits in HFT rival those generated by the hedge funds that back IEX is very telling. They are orders of magnitude different & are dominated by the hedge funds. That money also comes out of the pockets of investors.

That you don't mind it being inaccurate in its central thesis is problematic for those it paints negatively, but exactly what those on the other side want.