Doubling Sales Early Social Security Benefits and Long Life Spans

Drawback of Stop-Loss Orders

One thing to keep in mind is that once your stop price is reached, your stop order becomes a market order and the price at which you sell may be much different from the stop price. This is especially true in a fast-moving market where stock prices can change rapidly.
Source: http://www.investopedia.com/articles/stocks/09/use-stop-loss.asp