[huitzitziltzin]

Do you have multiple billions of dollars at stake with the broker?

If yes: he might annoy you enough with his impertinent margin demands that you go elsewhere, which makes his boss Very Unhappy.

If no: his boss has never heard of you.

Also it sounds like liquidating many of these positions would be no easy feat, when they represented 3-5 days mean trading volume in the underlying asset.

[rtkwe]

In a quote from the report it says it would have taken two weeks to a month to liquidate their positions just at Credit Suisse.

[fny]

If I have multiple billions at stake, I would assume my broker would be even more demanding of responding within a time frame. Note, I'm not calling for automatic liquidation, but rather some timeframe wherein discussions must be held or else the posted collateral is seized.

[rtkwe]

The problem there is at that level you're also a significant source of money for both the company and whoever gets bonus/commission on the money you bring in so suddenly there's a lot of reason to not make you annoyed enough to take your business elsewhere.