Partial Assignment of Short Options
Partial assignment happens when only some of your short options are exercised. See how the OCC and your broker allocate, and what the leftover stub means.
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How VIX Settlement Works: the SOQ
VIX settlement uses the SOQ, a Special Opening Quotation built from SPX opening prices under a zero bid strike rule. How the print is made, and why it gaps.
When Do SPX Options Stop Trading?
SPX options stop trading on two clocks: the AM settled monthly ends its session on Thursday, while SPXW weeklies run into Friday. Both cutoffs, with data.