Quote from MTE:Your comment is ridiculous! There is no justification for IB doing what it did.
So here are some questions related to IB margin-call liquidations that some of us would be glad to have answered by IB:
1) is the threat of overnight / market-at-open liquidation real,
2) are there any safeguards against bad ticks and after-hours ECN price manipulation, e.g. with asymmetric bid/ask spreads, as described above,
3) is midpoint pricing used when computing portfolio value for illiquid instruments, when the bid/ask spread can be worth significant amounts (and thus post-liquidation losses can surpass available equity, e.g. by -10%),
4) are porftolio values not monitored tick-by-tick and is some sort of price smoothing / periodic sampling used to attenuate the volatility of portfolio values (again at the risk of debiting the account),
5) is information about combination orders ignored when auto-liquidating, so that hedged positions such as leveraged options spreads are not closed in their entirety, but legged-out of (increasing capital requirements significantly) even when the customer used 'proper' TWS/API tools to establish the position (rather then legging in manually),
I believe the answer to question 1) is NOT, because IB once stated that they actually wait a few minutes after cash market opening for the bid/ask spreads to normalize. As for the rest of them, my guess would be YES, but I'd love to be corrected.