A trailing stop loss is an order that follows an investment's price as it moves in your favor, then triggers a sale when the price reverses by a set dollar amount or percentage. For example, a $5 trail on a stock priced at $100 starts with a stop at $95.
Unlike a regular stop-loss order, a trailing stop loss can move up as the stock price rises. It does not move back down when the price falls.
Trailing Stop Loss at a Glance
| Feature | How It Works |
|---|---|
| Main purpose | Protect potential profits and limit losses |
| Common setting | A fixed dollar amount or percentage |
| For a long position | The stop moves up when the asset price rises |
| When the price falls | The stop remains at its highest level |
| When triggered | The order typically becomes a market order |
| Main risk | The final execution price is not guaranteed |
How Does a Trailing Stop Loss Work?
A trailing stop loss tracks the highest price reached after the order becomes active and keeps the stop a set distance below that price.
Suppose you buy a stock at $100 and set a $5 trailing stop loss:
- The initial stop level is $95.
- The stock rises to $110, so the stop moves to $105.
- The stock rises to $120, so the stop moves to $115.
- The stock falls to $115, triggering the order.
- The trailing stop loss becomes a market order and attempts to sell at the next available price.
A price decline does not move the stop lower.
Percentage Example
With a 5% trailing stop:
- At a market price of $100, the stop is about $95.
- If the price rises to $120, the stop moves to about $114.
- If the price then falls 5% from its highest tracked price, the order can be triggered.
A dollar-based trail stays the same distance from the market price. A percentage-based trail changes in dollar terms as the price changes. A $5 trail remains $5 wide, while a 5% trail becomes wider in dollars as the stock price rises.
What Is the Difference Between a Stop Loss and a Trailing Stop Loss?
A regular stop-loss order uses a fixed stop price, while a trailing stop loss adjusts its stop price when the investment moves in a favorable direction.
| Order Type | Does the Stop Price Change? | Typical Use |
|---|---|---|
| Regular stop loss | No | Exit if the price falls below a set level |
| Trailing stop loss | Yes, in the favorable direction | Protect potential gains while allowing the position to keep rising |
| Trailing stop limit | Yes, in the favorable direction | Trigger a limit order instead of a market order |
For a long position, a regular stop might remain at $95 even if the stock rises to $120. A trailing stop could move from $95 to $115 as the price rises.
What Happens When a Trailing Stop Loss Is Triggered?
When a trailing stop loss reaches its trigger price, it typically becomes a market order. The market order seeks execution at the next available price, but the final sale price can differ from the trigger price.
For example, a trailing stop triggered at $115 may execute below $115 if the stock suddenly gaps down. A stop price is a trigger, not a guaranteed sale price. Fast-moving markets can create slippage between the trigger and the execution.
What Is a Trailing Stop Limit?
A trailing stop limit works in a similar way, but it becomes a limit order after activation instead of a market order.
The difference is the trade-off:
- A trailing stop loss gives execution a higher priority, but the sale price is not guaranteed.
- A trailing stop limit gives you more control over the sale price, but the order may not execute if the market moves past the limit price.
A trailing stop limit may therefore fail to close the position during a sharp decline.
What Are the Advantages of a Trailing Stop Loss?
A trailing stop loss can:
- Lock in part of a gain as the price rises.
- Reduce the need to adjust a regular stop manually.
- Set an automatic exit before entering a trade.
- Remove some emotional decision-making from the trade.
- Give a position room to keep rising while adding an exit rule.
The main difference from a regular stop loss is that you do not need to cancel and replace the order each time the market reaches a new high.
What Are the Risks and Limitations?
A trailing stop loss does not guarantee a specific sale price. Key risks include:
- Market gaps: The price may jump below the stop level before the order executes.
- Slippage: The execution price may be worse than the trigger price.
- Short-term volatility: A temporary decline can trigger the order before the price rises again.
- Broker differences: Brokers may use the last traded price, bid price or ask price to trigger the order.
- Trading-hour restrictions: Some brokers monitor trailing stops only during regular market hours.
- Activation delays: A trailing stop may not protect the position until the broker accepts and activates it.
Broker rules vary. Check which price the broker uses for triggering, whether the order works during extended hours and how long it remains active.
How Do Trailing Stops Work for Short Positions?
For a short position, a trailing stop follows the price downward rather than upward.
- The stop starts above the current market price.
- If the asset price falls, the stop moves lower.
- If the asset price rises to the stop level, the order triggers and attempts to buy back the short position.
For a long position, the stop follows the price upward. For a short position, it follows the price downward.
Is a Trailing Stop Loss Right for You?
A trailing stop loss may fit your strategy if you want to:
- Let a profitable trend continue without moving the exit manually.
- Set an automatic exit before entering a trade.
- Accept the possibility that short-term volatility will close the position.
It may be a poor fit for an asset that regularly makes sharp temporary swings. A tight trailing distance can trigger a sale during normal price movement. A wider distance gives the position more room, but it also allows a larger decline before the order triggers.
Choose the trailing distance based on the asset's volatility, your risk limit and your trading timeframe. A trailing stop does not guarantee a specific loss limit or profit.
Bottom Line
A trailing stop loss can help manage a rising position without requiring constant manual adjustments. Use it only if you accept two trade-offs: normal volatility can trigger the order, and a sudden price gap can produce a sale below the trigger price. Check your broker's order rules before using one.