Not Using Stop-Loss Orders
A big sign that you don't have a trading plan is not using stop-loss orders. Stop orders come in several varieties and can limit losses due to adverse movement in a stock or the market as a whole.1 These orders will execute automatically once perimeters you set are met.
Tight stop losses generally mean that losses are capped before they become sizeable. However, there is a risk that a stop order on long positions may be implemented at levels below those specified should the security suddenly gap lower—as happened to many investors during the Flash Crash. Even with that thought in mind, the benefits of stop orders far outweigh the risk of stopping out at an unplanned price.
A corollary to this common trading mistake is when a trader cancels a stop order on a losing trade just before it can be triggered because they believe that the price trend will reverse.
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