I know this is stupid, trading something without knowing all of the facts, but I am holding onto some Oct. 16 ES 1100 Call options. I have traded these options in the past and in August the instrument did not trade on Friday expiration date. In September I was holding some call options and exited on Thursday because I thought trading would end on Thursday again. In Sept. the options traded trhoughout Friday. Can anybody explain what's going on.