Are there any exchanges in the world open throughout the weekend? Primarily, i'm looking for something tightly correlated to the S&P500 and accessible via Interactive Brokers. If not, is there anything OTC? I need to hedge against extreme negative tail events that might happen once every few years and my math is telling me buying DOTM puts won't pay off with my strategy. I know that futures (GLOBEX) are open 24hrs during the week but closed for 48 hours on Saturday and Sunday. I've googled but seriously could not find anything. Thanks for any tips.