I wondered if anybody here uses stop-loss orders in his options trading and if so how do you decide to place it. I can understand the reason for stop-loss orders in stocks trading but I assume that stop-loss orders in options trading may be futile, since an option is a leveraged instrument that its price can be changed by large percentages within only a few hours, so that any stop order can be arbitrary triggered due to random price movements or other changes in the Greeks. Therefore it is important to plan the trade in advance, and to make certain adjustments if necessary, but not to place such an automatic stop-loss order. Also, the option itself may include some kind of stop-loss. For example, if instead of buying a stock for $1000 and placing a stop loss at 10% below the purchase price I bought a call option on this stock for $100 through which I "control" the same $1000 equity, isn't it some kind of a "built-in" stop-loss? Any feedback will be appreciated.