Stock Index Futures Plummet

December SP500 last traded at 2028.50, down 107.00 December Nasdaq 100 last traded at 4558.50 , down 243.75 December Russell 2000 is trading at 1125.70, down 66.40 December Dow Industrial futures are trading at 17491, down 789. Stock index futures have collapsed. Some futures are offered down the limit and have ceased trading.