The SPY close was 468.26. After hours was trading below 468, during the 15 or 30 minutes options still traded, and the 468P expiring today 12/20/23 were trading at 0.50, and I closed out to not risk assignment. Is there a way to see tomorrow how many people exercised their 12/20/23, 468 puts?
No, the OCC does not release this information. I would say very few would have been exercised. Although SPY did trade below 468 after hours, it was above 468 for the 45 minutes preceding the 530pm OCC deadline for exercise notification, and since it closed above 468, there would be no automatic exercises.