How much did traders or investors lose on that day? or did anyone blow out on the that day? it was like 1987, What happened to margin calls etc? What happened on may 6,2010 at 2:45 will be under investigation. what happened was close to robbery if exchange and brokers refuse to cancel trades and some traders or investors lost money.. i think what happened was technical issue and market just shut down and trading was like afterhours with no liquidity. in afterhours there are no bids. I suspect foul play. how can the trades be honored if the trading was not regular hours or normal market.