I suggest paying close attention to quote spreads while trading after hours. The quote gap between bid and ask prices widens due to the low trading activity associated with trading after work hours. You may have problems completing your orders in addition to affecting the share price. You will not be able to get the same cheap pricing as you would during regular business hours. It is also critical to note that prices are volatile throughout lengthy trading hours. The price of a stock traded after business hours may vary from the price of the stock at the conclusion of regular trading hours or when normal trading hours resume the following day. The article titled "after hours trading" has more useful information.