Joshker
Member
What I understood from a pretty convincing interview I saw with a professional trader was that in his experience that was not market manipulation, but a case of a bunch of limit sell orders being triggered at a popular target price (950-ish), which then caused a serious drop in SP, which then triggered cascading stop-loss sell orders.. The speed of the initial drop was according to him not something any MM could achieve all by themselves..
Such collective automated triggering can happen again of course.. so my remark was not in any way meant to be reassuring..
Not the way I remember it happening, I was on my computer with my mouse hovering to sell about $80k in weekly options that very quickly turned to $40k. I had a limit order in, when the price dropped from 968 to 962 I went to change it to market and it just fell. I have no doubt this was manipulated.