Entering Friday, I was long 5 QQQ 171-170.50 puts spreads, due to expire on the 11/30 close.
Earlier in the session, I sold 1@0.47 and 1@0.48. It appeared that during the day, the spread was never lower than .44 bid.
However, at 3:18pm (EDT) my nervous brokerage house liquidated the spread for...