What is a Trailing Stop Order? Definition, Formula, and Example
A trailing stop order is a stop order whose trigger price automatically ratchets up as price moves favorably, locking in profits while converting to a market order when price retraces by a set dollar amount or percentage.
Definition
A trailing stop order is a stop order whose trigger price moves with the market in the favorable direction but never against it. For a long position, the stop ratchets higher each time the security prints a new high since order entry; the stop never moves down. When price retraces by the trail amount, the order converts to a market order and exits the position. Interactive Brokers, Schwab, Fidelity, and most retail brokers support trailing stops as native order types specified in dollar amount, percentage, or basis points.
How a Trailing Stop Is Calculated
For a long position, the stop trigger is:
Stop Price = Highest Price Since Entry − Trail Amount
Or for percentage-based trails:
Stop Price = Highest Price Since Entry × (1 − Trail Percent)
For a short position, substitute "Lowest Price Since Entry" and add the trail amount. Once a trailing stop ratchets to a new level it cannot move backward — the high-water mark is sticky. The stop converts to a market order on the first print at or through the trigger.
Worked Example
Long 100 shares of NVDA entered 2026-04-15 at $850 with a 7% trailing stop.
| Date | NVDA High | Trail Calculation | Stop Price |
|---|---|---|---|
| 2026-04-15 | $852 | 852 × 0.93 | $792.36 |
| 2026-04-22 | $920 | 920 × 0.93 | $855.60 |
| 2026-04-30 | $1,020 | 1,020 × 0.93 | $948.60 |
| 2026-05-02 | $1,015 | (no new high) | $948.60 |
| 2026-05-05 | $945 | triggered, filled $944.80 | exit |
Locked profit: $944.80 − $850 = $94.80 per share, or 11.2%. A static $800 stop set at entry would still be open and the position exposed to a deeper drawdown.
When Traders Use Trailing Stops
Trailing stops fit position trades held over days to months and trend-following systems where the operator wants systematic exit discipline. Common configurations:
- ATR-based trail: Trail amount = 2× or 3× the 14-period ATR. Adapts to volatility regime — see average true range.
- Percentage trail: 5–15% for swing trades on liquid large-caps; 20%+ for small-cap momentum names.
- Chandelier stop: Highest high − 3× ATR, popularized by Chuck LeBeau.
- Parabolic SAR trail: Accelerating stop that tightens as the trend matures — see parabolic SAR.
The order also serves as a behavioral guardrail by eliminating the discretionary "when do I take profits" decision.
Limitations and Common Misconceptions
- Whipsaw risk: In choppy ranges, a tight trail gets hit on normal noise and forces re-entry at worse prices.
- No gap protection: A trailing stop converts to a market order on trigger. An overnight earnings gap fills 5–20% below the stop with no slippage protection. Hedge gap risk with protective puts, not trailing stops.
- Fixed-percent trails ignore volatility: A 5% trail is wide on JNJ and tight on TSLA. Volatility-adjusted trails (ATR-based) avoid this mismatch.
- Trailing stop ≠ trailing stop-limit: A trailing stop-limit will not fill in fast markets if price gaps through the limit. Use trailing stop (market) for exit certainty.
- Some brokers reset the trail intra-day: Verify whether your broker tracks the high-water mark across sessions or only intraday. GTC behavior varies.