A trailing stop adjusts its trigger as price moves favorably. For a long position, a basic fixed-distance trail rises with the reference price and does not fall when price reverses. It can help apply an exit rule, but it does not guarantee the profit shown at its trigger.

Follow the Trigger and the Fill Separately

Suppose you buy at $50 and use a $2 trail. With an initial reference of $50, the trigger is $48. If the eligible reference rises to $55, the trigger advances to $53. If it then falls to $53, the order activates under the broker's rules.

A trailing stop-market order may fill below $53. A trailing stop-limit order may not fill at all. A trigger at the entry price is not necessarily break-even after fees and slippage. See Investor.gov's order-type explanation.

Four Ways to Define a Trail

  • Fixed distance: a specified currency amount or number of points from the favorable reference.
  • Percentage: a percentage of that reference; the currency distance changes as price changes.
  • Volatility rule: a distance based on an indicator such as ATR.
  • Chart rule: an exit following a moving average or swing level.

The last two may be strategy instructions rather than native broker orders. Define whether they update intrabar or at the close, and whether an update can loosen the stop. An ATR formula can produce a lower candidate stop when volatility rises; a one-way trail would retain the higher previous stop instead.

Choosing and Testing a Rule

A tight trail can exit ordinary fluctuations; a wide trail can surrender more of an unrealized gain. Neither is universally superior. Compare fixed and trailing exits on the same entries, including costs, gaps and the actual update timing. Avoid choosing a distance because it happens to fit one memorable trend.

Taking partial profits changes the remaining exposure, but does not guarantee the combined trade ends profitable. A gap in the remainder can outweigh the realized gain.

Operational Checks

Confirm the reference price, session coverage and where the trailing logic runs. A locally managed trail may stop updating when software disconnects. FINRA explains why stop prices differ from execution prices; automation does not remove that distinction.

Risk Disclaimer: Trading involves substantial risk of loss. Past performance is not indicative of future results. See our full risk disclaimer.