IB intraday margin policy becomes increasingly more conservative recently. If you take a look Futures Maintenance and Overnight Margin Requirements, quite many markets whose margin requirements are really unreasonable - the intraday margin is exactly the same (100%) as the overnight margin, in contrast to 50% off intraday margin advertised in IB website. You know, IB is a very special brokerage in that it never make margin calls. It hs a real-time margin monitor, in which will liquidate your positions instantly if you are short of margin. Provided that IB has such a margin monitor in place, I don't really get why they still need such a unusually high margin requirement (intraday margin is 100% of overnight margin). A real-time monitor us is really a forced money management system to us. This make sure we can't keep holding the losing position indefinitely. That protects us from going broke. Once the loss drop the margin level to a dangerous level, the system will post a non-cancellable market stop to get us out instantly. But now what IB doing is no difference from telling us "a market stop", even if we are 200 ticks away before we go broke, is not enough. We need to place the "market stop" 400 ticks away to make us safe. Perhaps it implies IB still don't believe in their own margin monitor, or Ib is so worried that price will move so ridiculously (eg 400 ticks up/down in a few seconds) so all maintenance margin is exhausted, even a "market stop" can't help us out. I'm in the market for many years. I've never seen a popular market which will move so rapidly INTRADAY to justify charging overnight margin even if we are trading INTRADAY. If you have seen any intraday charts of any liquid market (I say INTRADAY, not overnight) which can justify such a margin policy, please show me one.