Question: when do qqq options expire?
Answer: Options expire at 4 p.m. on the third Friday of the month in the sense that they no longer trade. But the stocks themselves keep trading after hours, so, as this reader notes, what's in-the-money (ITM) at 4 p.m. on Friday can be out-of-the-money (OTM) by 5 p.m., or vice versa.