From an IB Bulletin: (August 2007)
To CFE,ECBOT,GLOBEX traders:
Mon Aug 6 09:14:14 2007 EST
IMPORTANT MARGIN NOTICE
Effective Monday 6 August, 2007, and until further notice, there will be a
significant change in the intraday margins for most stock and index futures
and futures options. Specifically, the intraday margin will be set to cover
a price move of 4% in the instrument, but will not exceed the regular
maintenance margin. By example, a 4% move in the ES futures would require
intraday margin of 4% * 1450 price * 50 multiplier = 2900 USD. The regular
intraday margin is 1400 USD and the regular overnight maintenance margin is
2800 USD so for ES the intraday margin would be the same as the overnight.
PLEASE NOTE THAT THE ONLY MARGINS AFFECTED BY THIS POLICY CHANGE ARE
INTRADAY (REDUCED) MARGINS ON EQUITY-LINKED FUTURES AND FUTURES OPTIONS.
Please note that many of the statutory margin requirements for many US index
futures and options imply a very small intraday margin requirement (in the
case of ES, less than 2%). In light of the recent volatility in the markets,
we feel it is prudent to apply margins that are consistent with this
volatility.
Nov 2008:
IB's intra-day was the same as the exchange overnight. Not sure when they made the change. IB was changing things very quickly at the time.
YM $6875 initial $5500 overnight
ES $6188 initial $4950 overnight
NQ $4000 initial $3200 overnight
Not all brokers were being this conservative. IB is VERY conservative.
Jack