Orders at E*Trade can be specific for the day session only or the day session plus both extended-hours periods. For all orders at E*Trade, you can specify either good for the day or immediate or cancel. The immediate or cancel term will ensure the order is filled entirely or partially, After-hours trading refers to the period of time after the market closes and during which an investor can place an order to buy or sell stocks or ETFs. Pre-market trading, in contrast, occurs in the hours before the market officially opens. Together, after-hours and pre-market trading is known as extended-hours The decision to trade after hours depends, of course, on your investment goals, trading style, and risk tolerance. While trading in the extended sessions is not for everybody, for those traders who understand both the potential risks and opportunities, it is certainly an avenue to explore.