The previous volatility occurred a few months ago. IB was the only brokerage which decided to raise most of the intraday futures margin up to 100%. In other words, the intraday margin is exactly the same (100%) as the overnight margin, in contrast to 50% off intraday margin advertised in IB website. Take a look at Futures Maintenance and Overnight Margin Requirements. Several months passed. No brokerage has been closed down. IB is only willing to bring back some to 50%. Some others are still sticking at the new 100% intraday margin, including ECBOT, NYMEX, GLOBEX (a few instruments), CBOT, CFE, CME. Read the full list of futures which still hold 100% (they used to be 50% only) on the next post. People should think IB is doing the right job to protect our assets since it is a professional firm (so it must be right). While some degree of prudence is good but a firm doesn't need to go too far. If you are too worried about any single risk on the market, you shouldn't trade or do business at all. In fact IB already has a very special mechanism which is more than enough to protect us even in financial crisis or especially volatile periods: - it doesn't make any margin call in whatever case - it will liquidate your positions instantly once you fall short of margin - it places a non-cancellable market stop to bring you back above the margin requirements - all are done in real-time, up to the second Did IB get too freaked out due to previous volatility? Imagine you are trading intraday. Tell me which liquid market can kill you all 50% intraday margin in a matter of seconds (or even minutes). IB is only dangerous if the market is so fast that even a non-cancellable market stop can't help to get you out before all your 50% intraday margin is used up. Why does this firm has to be so paranoid? What are the reasons behind? It is good to be prudent but IB doesn't know how to take a balance. There is a spectrum of brokerage, from overly conservative (IB 100% intraday) to very aggressive (e.g. $500 intraday margin for ES). IB is being the most conservative brokerage in the US. If IB is the only one who is doing the right job, it implies all other brokerage is going to go bankrupt in the next financial crisis. Nevertheless, in reality, there are still many moderately conservative to moderately aggressive brokerage which still survive after decades. Why can those less prudent (but not too aggressive) brokerage still survive even without taking some of the strictest measures like IB does? Why? IB should learn from them. IB please seriously consider whether there is any necessity to hold 100% intraday requirements, or even raise intraday margin up to 100% again next time. Don't forget you have a real-time monitor and you will liquidate our positons instantly once we fall short of margin. Your risk is already lower than even those of the conservative brokerage but why are you still being so paranoid about it?