Quote from tyrant:
The most likely explanation is that IB's own code for auto liquidation is flawed. This is a serious flaw. Not only that, previous post about IB liquidating the long puts FIRST is totally nuts. I am also following this thread closely.
I agree 100%. From IB's website: 1981 Efforts are made to code and test a system that identifies potential delta neutral trade pairs. Our greatest challenge: how to electronically read the prices of options as they are posted
From 2000: On average, more than six percent of the daily global volume of exchange-traded equity options and equity futures is now traded across the Timber Hill/IB network.
Hmmmmmm. Maybe I know why they were liquidated in that order....