6:1 sounds good, but in practice my long short stock and ETF portfolio starts hitting the IB risk limits a bit over 3:1. I wouldn't expect much more than that, and I'm usually mostly dollar/sector neutral too.
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Maverick, IB does not separte stock risk from option risk in PM.
MoreLeverage, You probably put just 2 or 3 positions into your portfolio. 1:3 is a sign of concentration.
Quote from ids:
Yes, we do, but we also ask concentration margin on options. We will charge through your nose if you have a bunch of options on one underlying. Is not it right thing to do?
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Maverick, I am not advising stock leveraging but one can definitely do it in PM effectively with a diversified portfolio.
Whistlingleaf, are you asking about preferred stocks? Can you provide an example of the instrument you are talking about?

I was referring to my present portfolio, which has ~40-50 equity positions, long and short, including big ones in some broad ETFs. In my experience over the past year or so, I start hitting the risk limits around 3.25-3.5:1 or so. Maybe it's just my trading style or security selection that shows up as more risky?Quote from ids:
MoreLeverage, You probably put just 2 or 3 positions into your portfolio. 1:3 is a sign of concentration. [/B]