When a stoploss is hit, the broker will route your order to the market. But, whether they will get you out and at what price is another story. Etrade with whom I traded for over 7 years routed my orders to the market, 'At Market', meaning I was exited at the stoploss price or the next possible price below. Not all brokers do this however so you gotta be extremely careful when chosing a broker. Take Bell Direct for example. If your stop is hit with them, they route the order to the market "At Limit", meaning, that if there aren't enough buyers at your stoploss price, you won't be exited out of the trade. If the stock does down the crapper then tough luck, you could be up for a big loss. So always make sure you question these brokers like a damn witness before deciding to trade with them.