I noticed that the value of some of our portfolios was changing after the market for the underlying stock had closed. Clearly, the value of the options was changing after the 4:00 EST close of trading. I did a Google search to find a list of options that traded after hours, and came up pretty empty. But now I have found the list, and will share it with you just in case you want to play for an extra 15 minutes after the close of trading each day.
List of Options Which Trade After Hours (Until 4:15)
Since option values are derived from the price of the underlying stock or ETP (Exchange Traded Product), once the underlying stops trading, there should be no reason for options to continue trading. However, more and more . . .