Look at the analysis , risk/reward of this trade. Weekly AMZN . expired yday 4 pm ET.. during the day it was 167. towards the end it went to 165.5.. I was short the 165 puts. I had sold them at 1030 a.m for 18 cents. LOL free money. .that was what I thought. Then towards 330pm. I got nervous.. and decided to close them. it kept bouncing up and down.. finally I closed it for 8 cents. it went to 2-4 cents.. Bid /ask.. it was 165.5 . no one would want to exercise them.? but wait . in After hours.. AMZN fell 1.7$. So theoritically if you were holding the puts, from 4 pm to 530pm. you could call your broker and get them exercised.. and at the same time buy shares back at 163 in the after hours market. so if you bought it for 2-4cents.in the final minutes of trading . your lotto ticket could give you a 150 cent return.. to even more..check the chart... I am in CDT.. hence the time shows 1500 as mkt close time so the time to exercise the option is upto 1.5 hours after close.