Quote from ProfLogic:
I know this question was directed at me but I would like to comment.
I traded the day of the flash crash, futures not equities but my trading partner sitting next to me does trade equities.
The flash trading, HFT's were not, in total, responsible for the overall market drop. It was a perfect storm of events that brought about this event that the HFT's were a part of, just like all of us trading that day.
Many of us trading the equity futures began shorting the afternoon before the crash and continued to add to our short positions up until 1:30 pm EST the day of the crash.
Funny there were plenty enough buyers all the way to the bottom to cover all of us shorting the market. And then plenty of sellers to cover all of us buying back on the bounce.
My trading partner got bit on a single long position simply because he was arguing with what his chart was telling him. He was telling me at 2 pm EST he should get out but being the stubborn person he is . . . he stayed in.
You are partially correct about Tradeworx, yes they stopped trading but only for 8 minutes while they could evaluate what was happening.
Funny, two weeks after the crash the markets broke through the low of the day of the crash. Why, because the markets are never wrong. Sentiment will ALWAYS create the long term oscillations that should be created. The SEC is clueless.
I've been trading futures for 15 years, I am not a HF trader and I am profitable.
"Why should anyone be allowed risk free strategies that aren't available to everyone"? Because If I spend years of my life gaining an edge over these chaotic markets I will be damned if I will be forced to share that edge with everyone.