Trailing stop order

A trailing stop order is a stop order with an automatic adjustment. Instead of a fixed stop price, you specify a trailing distance — a dollar amount or percentage. As the price moves in your favor, the stop price moves with it, maintaining a constant distance. If the price reverses, the stop is triggered. It is the standard tool for locking in profits while staying exposed to further gains.

How trailing stops work: following the high water mark

When you place a trailing stop, your broker tracks the highest price the security reaches (for a long position) or the lowest price (for a short position). The stop price is always set a fixed distance below that high (or above that low).

Example (long position):

• You buy a stock at $100.
• You place a trailing stop with a $5 trailing distance.
• Initial stop price: $95 (the $100 entry minus $5).
• Stock rises to $105; the high water mark is now $105, so the stop price rises to $100.
• Stock rises to $110; the stop price rises to $105.
• Stock falls to $106; the stop price stays at $105 (it does not fall).
• Stock falls to $104; the stop price still stays at $105.
• Stock falls to $104.99; finally the stop is triggered, and you are sold at the next available price (likely around $104.99 or lower).

The key rule: the stop price only moves in your favor, never against it.

Dollar vs. percentage trailing stops

Most brokers allow you to specify the trailing distance as either a fixed dollar amount (e.g., $2 per share) or a percentage (e.g., 5%).

Dollar-based trailing stops are simple and fixed. If you specify a $2 trailing stop on a stock trading at $100, the stop is at $98. If the stock rises to $200, the stop rises to $198. This works well for stocks with stable price ranges but can become too tight (or too loose) if the stock moves a long distance.

Percentage-based trailing stops scale with price. If you specify a 5% trailing stop, and the stock rises from $100 to $200, the stop adjusts from $95 to $190 — always 5% below the high. This is often more intuitive and self-adjusting across large price moves.

Trailing stops in choppy markets

The enemy of trailing stops is small, repeated reversals. Suppose a stock is in a trading range, bouncing between $100 and $105 repeatedly over a day. You place a 2% trailing stop and buy at $100.

• Stock rises to $105; stop moves to $102.90.
• Stock falls to $102.50; stop triggers.
• You are out at $102.50, having locked in just a $2.50 (2.5%) gain.
• The stock then bounces back to $108, and you are on the sideline.

This is called whipsawing: the trailing stop is too tight for the natural intraday volatility, so it exits before the real move. Professional traders in choppy markets often widen their trailing stops (5–10%) or simply use a fixed stop order at a level they have thought through carefully.

Trailing stops for scalpers and day traders

Trailing stops are popular with day traders and scalpers because they automate the core challenge of intraday trading: knowing when to take profits. You can set a trailing stop at market open and let it run; when the stock reverses even slightly, you are out with whatever gains the trade produced.

The risk is that a normal pullback in an uptrend will trigger the stop, and you miss the continuation of the trend.

Trailing stops vs. profit-taking limit orders

An alternative to a trailing stop is to place a limit order at a target price (e.g., “sell at $110”). The limit order sits in the order book waiting to be hit; if the stock reaches $110, you are out. The advantage: if the stock continues to $115, you miss nothing (you are already out). The disadvantage: you have to guess the target price in advance.

A trailing stop is more dynamic: it grows with the stock, letting you stay in as long as the momentum continues. The disadvantage is the whipsaw risk.

Trailing stops on short positions

For a short position, the logic inverts. You short a stock at $100 and place a trailing stop with a $5 trailing distance.

• Initial stop price: $105 (the $100 short price plus $5).
• Stock falls to $95; the low water mark is now $95, so the stop price falls to $100.
• Stock falls to $90; the stop price falls to $95.
• Stock rises to $94; the stop price stays at $95.
• Stock rises to $96; the stop is triggered, and you buy to cover at the next available price.

The trailing stop on a short protects against a violent rally, just as it protects a long position against a violent selloff.

Limitations and broker support

Not all brokers support trailing stops for all securities. Most support them for stocks and large-cap ETFs, but some do not support them for options, futures, or international securities. Check your broker’s documentation.

Some brokers also implement trailing stops on their servers; others require the order to be held on the exchange. Server-side trailing stops are more flexible but mean your stop price depends on your broker being online and responsive. Exchange-based trailing stops are more reliable but less flexible.

See also