Quote from Option Trader:
Reply to Def (part one)
Two types of liquidations: a) one for margin violations, b) the other for the RATIO of net liquidation value versus gross position value, as occurred here. The former, IB says liquidates according to what will best alleviate the margin problem. The latter, IBj acknowldges does NOT liquidate according to the RATIO, rather the software almost randomly breaks down the position SIZE, ignoring whether it will help or hurt the RATIO.
My securities attorney told me clearly that the latter is a clear violation, because it hurts the customer unnecessarily, and does not necessarily help the broker; for sure, if it happened, has to be corrected.
...and we have been waiting patiently.
Please don't misquote me.
I did not state that it is random, nor did I state anything about liquidating according to the ratio. The 50:1 ratio is just the definition of our maximum position size relative to net liq. Above this ratio, we will act; below it, we don't.
The control algorithm says "your position is too big for the existing capital, make the position smaller." This is precisely the same logic as is used for margin: "your margin is too big for your current capital, make the margin smaller" (i.e. make margin creating positions smaller).
By definition, if you make the position smaller, assuming no other changes, the ratio of position to netLiq will be smaller and more likely to be compliant. This is basic math.
ratio = posValue/netliqValue
You cannot program to reduce the ratio (as you suggest in your other post). The ratio is a derived figure based on the monetary values expressed in the formula. You can do one of precisely two things:
1) increase capital (i.e. net liq)
2) reduce positions
I hope the explanation of how IB manages positions and liquidations -- which was my original point in contributing to this thread -- has been adequately made. I don't believe there is anything else I can add to clarify (although I will be happy to do so, if I missed something). Optiontrader, I don't think this is the proper forum for discussing the details of your particular problem but I do believe you have received communications from IB staff regarding your complaint and our resolution regarding it.