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IB sent this out, this week: Customers with Short Option Positions If you are short the options, you may be assigned until 5:30 pm based on the decisions to exercise by other market participants. These traders will have the ability to see the current market price after the close of options trading, at a time when you will not be able to close your option position. Again, these stocks may move significantly the after the close of regular trading at 4pm. This may mean that a position that was well out of the money at 4 pm may be in the money, perhaps significantly, by the time it is exercised against you. There is no way to predict whether the long holder of the option will exercise based on the 4:00 pm (16:00 price) or some later price up to 5:30 pm (17:30). The only way to avoid this volatility is to close out your short option position before 4 pm. To repeat, the only way to mitigate the uncertainty of your post-expiration stock position is to close out short positions prior to the end of the trading session. Interactive Brokers Client Services

@poseidolginko Thanks for the hint, something is not working here. I will investigate.

@mbee213 Glad to be part of your journey RV1p is the RV as of yesterdays close for a put calendar, it does not contain any historical numbers, it is solely calender price divided by underlying. There is a tooltip which gets displayed when you hover over the column title That sometimes you can read negative numbers is kind of an artefact from the bid ask spread. Just for the example's sake, let's take GSK's put calendar rv as it is reported today (this is just an ADR on Glaxo and quite thinly traded, so a good example for the negative RV): RV is the mid of the long leg minus mid of the short leg divided by the underlying price. We have and Because of the huge spread of the long leg, we get a negative price for the calendar of (0.375 - 0.4) = -0.025. Divided by yesterday's closing price of the ADR of 37.34 the RV is -0.0669% which is what is displayed. If you refer to scalping as quickly enter and exit the calendar several times in one cycle you would want the RV to bounce around as much as possible visually (better the individual RV lines than the black average line since the average is always somewhat smoothed) and you would definately want low spread values as they refer to the average bid ask spread of ATM options over if I remember correctly now the last 30 days. Keep in mind that the 'bounciness' of the RV is also highly influences by the size of bid ask spread, as they prices are merely a snapshot at the end of the day.