Please stop blaming HFT for the Flash Crash that never was

After the tweet-hack incident last Tuesday caused a one percent down spike in S&P futures, it was only a matter of time before the perpetual pessimists at Zero Hedge, ignorant NBA team owners and retail punters would blame high-frequency traders for all that is unfair in the current marketplace. Nothing new there. What caught my eye is that some of the more nuanced and respected bloggers were clinging on to this idea too: the Flash Crash of 2013 was born. Josh Brown at The Reformed Broker mentions:

‘[HFTs] provide a glass of water in a monsoon, but when you really need them to absorb sell orders, they’re on the sideline, buffering. It’s a joke.’

And I’m not even sure what Howard Lindzon (founder of StockTwits) exactly means with the following sentence – and who he wants to punish – but it’s safe to say he’s not happy:

‘I don’t like the idea of hackers and market manipulation, but if this is what it takes to get the algo’s away from the machines with their bullshit bids and false sense of liquidity, all the better. We need to punish these type of hackers with as much speed and breadth as we can.’

After the release of the infamous AP tweet, 175 million twitter users can read that the White House has been attacked and President Obama might well be dead. Every prop desk, hedge fund and anyone with an e*trade account and a twitter feed is one mouse click away from selling the S&P future. And somehow, at this point, it is expected of HFT firms to keep their bids in the market and ‘absorb the sell orders when you really need them’? I would like to call double standards on this one. For all we know, the leader of the free world has been attacked, and simply because HFT trading firms are ehm.. HFT firms (?).. they are supposed to buy your S&P futures? Using technology and social media to gather information is great, but acting upon new information to avoid trading losses is ‘a joke’?

Regarding that disappearing liquidity: have another look at that much referenced Nanex chart. What commentators seem to ignore is that people who really wanted to get their trade done managed to do so, as indicated by the spike in trading volume. The 1% up and down move was on the back of 300,000 contracts – almost 20% of the day’s volume in a matter of minutes. Seems like decent liquidity to me. Sure, the slippage may be bigger than usual, but oh yeah, let’s not forget that THE PRESIDENT HAS JUST BEEN ATTACKED.

Bloggers and journalists seem to idealise a sort of utopian past in which all trades got done at mid-market, with unlimited levels of liquidity at any point in time, and a complete lack of market manipulation – a world that supposedly ended with the rise of the evil HFT firm who does nothing but stealing your money. Think about the ultimate carnage that would break out on the NYSE floor after the release of such a news message. No floor trader would honour their bids and everyone will scramble to get short – most likely against their own clients.

There is nothing else the HFT guys could have done other than pull their resting orders. Any real-person trader would have done the same. Even though HFT algos are programmed by Physics PhDs, their thinking isn’t very different to those old school floor traders. It’s mainly the execution that has evolved, the basic market making strategies not so much. It is pretty easy to program the behaviour of traders in calm market surroundings as their instincts are fairly predictable. However on unexpected, never-seen-before occasions as these ones all predictability goes out the window – and so does the algo. Innovative human thinking has to take over at this point; which it did. That is why the S&P future went down when everyone thought a disaster had happened, and why it came back up when it was clear that there was no disaster.


6 thoughts on “Please stop blaming HFT for the Flash Crash that never was

  1. Pingback: HFT and Exploiting a Loophole | Points and Figures

  2. hello.
    I agree with your points here.
    But in a proper more human market making world someone would have called that tweet fake and stand ready to absorve even more orders than HFT.

    • Hi Joao. Thanks for your thoughts. I see where you are coming form but I think you are underestimating the human factor in this particular instance. Since the move took place over several minutes rather than milliseconds I don’t think it was the actual twitter post that caused most HFT strategies to pull liquidity – bear in mind that only a very small part of algos are hooked up to a news/twitter feed. It’s more likely that algos pulled due to the sudden selling pressure (initiated by people who read the tweet) or by human operators of the trading strategy ‘pressing the emergency button’ after they became aware of the news.

  3. Pingback: Debunking HFT Myths | zerolatencyblog

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