Quote from TraDaToR:
I watched the T§S for ES and the algo/ fat finger/ whatever bought and sold large market orders in the same second, removing really large sizes and driving prices a lot outside fair value.
Bids and asks didn't really update before the market was back at fair value and the guy for sure wasn't able to sell at tops and buy at bottoms after it...Even if its limit orders were already placed at extremes, the stop orders filled would not have offset the huge sizes needed to drive it there....
The guy has huge losses IMHO...
Huge losses no doubt. Some idiot, (either intentionally or out of pure stupidity) hit the wrong button or was testing in a live environment.