Berserk HFT Algo Du Jour

Just another day in the markets, just another HFT algo going completely insane and Nanex catching it in the act.

On November 19, 2013 starting at 16:00:37 and continuing for about 15 seconds, a High Frequency Trading (HFT) algorithm was let loose in the stock of  Fifth Third Bancorp (symbol: FITB, market capitalization: $17.3 Billion, plus or minus $1 Billion). The stock price swung wildly, rapidly trading up and down in a 3-5% range many times over. Just before this algo ran, the stock traded in a 25 cent range over the entire trading day. This HFT algo sent prices up and down in a $1 range, which is 4 times larger than the entire day’s trading range.

1. FITB – Trades color coded by reporting exchange and NBBO (gray/red shading).

One or more algos were fooled into buying high and selling low.

2. FITB – Showing NBBO: red is when it was crossed (bid price > ask price), yellow when locked (bid price = ask price) and gray for normal.

Here we can clearly see the oscillations. Remember, this is spread between the best bid and ask. While the spread itself remains narrow, the prices oscillate over a 3 to 5% range in less than a second.

3. FITB – Best bids and offers color coded by reporting exchange.

4. FITB – Zooming in on the trades (circles) and NBBO over a 5 second period of time.

5. FITB – Zoom of the best bids and asks.

6. FITB – Zoom of all bids and asks.

    



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