Think about your question!!! You need buyers if you want to sell. Or sellers if you want to buy. How can there be a stop if there is no "real" market? Who are you going to sell to? Or buy from? What if one share trades at a price below your sell stop? What does that mean? Trade_addict? Trading should not be an addiction. You need to know how it works. It isn't a game. And after-hours is NOT when anyone who doesn't understand this should ever be trading at all. M.
US Stocks: With IB you can enable stop orders outside NYSE trading hours (not recommended). CME E-Minis: Native stop limit orders are active during Globex trading hours RTH and ETH.