How a trailing stop-loss follows price
A trailing stop-loss is an order that sells a holding when its price falls a set distance below the highest price reached since the order was placed. You set the distance once, and the trigger level rises as the price climbs.
Suppose the price rises steadily after you place the order. The trigger rises with it, staying the same gap below the highest point reached. If the price then drops by that gap, the order activates and sells. It moves up as gains build and never moves down, because a lower trigger would allow a larger loss than you first accepted.
An activated trailing stop usually becomes a market order, which sells at the price available at that moment. The final sale price can therefore differ from the trigger level in fast markets. Exact rules, such as which prices count and whether the order becomes a market or limit order, vary between providers and markets. Check how your provider handles these details before you rely on the order.
Before you start
A few checks help before you place a trailing stop. Each check takes little time.
- Confirm that the provider offers trailing stops for the market you want to trade.
- Read how the provider calculates the trigger, including which price it watches.
- Decide how much movement you can accept before the order triggers.
Steps to place the order
- Open the position you want to protect, and note your entry price.
- Choose the trailing stop option among the provider's order types, on the side that closes your position.
- Pick a fixed distance or a volatility-based distance, as explained below.
- Enter the distance, then check the trigger level the provider displays.
- Set how long the order stays open, such as until it fills or until you cancel it.
- Confirm the order, then check that it appears in your open orders.
Fixed distance versus volatility-based distance
Under a fixed distance, the gap stays the same in price units each time the trigger moves. This method is simple to read and easy to explain to another investor. The gap does not adapt, though, so a gap that suits a calm market may be too tight when prices start swinging.
A volatility-based distance takes its gap from recent price movement. The common measure is the average true range, which is the typical size of price moves over a recent window. If the market moves more, the gap widens, so normal swings are less likely to trigger the order. The trade-off is that a wide gap can let a larger loss build before the order triggers.
Other stop types compared
A standard stop-loss sits at a fixed price that you choose, and it does not move. It sells when the price reaches that level, so it guards against a fall but does not follow a rise. A trailing stop uses the same idea with a level that adjusts upward as prices climb.
An OCO order links a stop with a limit order as a pair. The limit order usually sits above the current market, so the pair covers both a loss and a target. When either order fills, the other is cancelled automatically.
Standard stops are the simplest choice. Trailing stops try to keep gains while limiting downside. OCO orders suit investors who want both a loss limit and a target at once.
When a trailing stop behaves unexpectedly
A trailing stop can behave differently from what you expected. The cause is often a difference in price type, timing or market conditions.
- When the order did not trigger, compare the trigger level with the prices you were watching.
- Where it filled well below the trigger, review the fill details and the market conditions at that time.
- If the order is missing from your open orders, check your order history, then reach out through the provider's official channels.
- If the distance no longer suits the holding, cancel and replace the order rather than editing it blindly.
Rules for trailing stops differ between providers, markets and countries. Check the provider's own documentation and your local financial authority before you rely on any order type.
Not every broker offers trailing stops
Order types vary a lot between providers, so a trailing stop may be available on some services and missing from others. If you compare stock trading services, check whether they offer trailing and OCO orders. You can start with stock trading providers or the guide to choosing a stocks provider.
If you trade derivatives, order behaviour matters more because prices can move quickly. Read the guide to choosing CFD providers and the guide to choosing futures brokers before you decide. Losing money is a real possibility with these products, and a stop does not remove that risk.