Concept

Trailing Method Taxonomy

Trailing Method Taxonomy, also known as swing-trail, MA trail, ATR/chandelier, PSAR, is a Risk, Sizing & Exits concept. The Library holds 11 implementations, each one a working definition you can pull into Quant.

Top Trailing Method Taxonomy indicators

The top custom implementations, built on the original standard Trailing Method Taxonomy formula.

11 total

Any of the 11 Trailing Method Taxonomy implementations below can become a backtested trading strategy, built in plain English with no code.

Signals & Overlays

Indicator

Fibonacci Trailing Stop

Indicator

Neighboring Trailing Stop

Indicator

What is a Trailing Method Taxonomy?

A trailing method taxonomy classifies trailing stops by what the stop follows and how it is allowed to move. Every trailing exit answers three design questions: what anchor the level tracks (a confirmed swing high or low, a moving average, a volatility offset, a channel extreme, or a fixed percentage), when it updates (every bar, or only when price makes a new extreme), and whether it can ever loosen or only ratchet tighter. Sorting the dozens of published methods along those axes collapses them into a handful of families.

The families: structure stops trail behind confirmed swings; moving-average trails exit on a cross of the average or use the line itself as the stop; volatility trails offset price by a multiple of average true range, as in the volatility stop and the chandelier; channel trails exit at the N-bar extreme, Donchian style; parametric curves such as Parabolic SAR tighten automatically as the trade ages; percent trails keep a fixed fractional distance from the peak; and profit-lock ratchets jump the stop to breakeven and beyond at preset milestones.

The taxonomy matters because the family choice, more than the exact parameter, sets the trade-off every trailing exit makes: giveback versus whipsaw. Tight, fast-updating trails protect open profit but get shaken out by ordinary pullbacks; wide, slow ones survive the pullbacks and hand back more at the end. No family wins in every regime, so the practical use of the taxonomy is matching a trail's behavior to how the traded market actually moves, then testing that choice rather than assuming it.

How to classify a trailing method

Any trailing stop you meet, whatever its trade name, can be placed in the taxonomy by answering four questions.

1Name the anchor. What does the level follow: a structure point (the last confirmed swing), a moving average, a volatility offset (k × ATR from the close or the trade's best price), a channel extreme (the lowest low or highest high of the last N bars), or a fixed percent from the peak?
2Name the update rule. Does the level recalculate every bar or only when a new extreme prints, and does it trigger on a close beyond the line or on any intrabar touch?
3Name the tightening profile. Constant distance (chandelier-style), accelerating (Parabolic SAR increases its step each time price makes a new extreme), or stepped (profit-lock ratchets that move only at milestones).
4Name the exit behavior. Exit-only, or stop-and-reverse, where crossing the line closes the trade and opens the opposite one.

How it's calculated

Each trailing method produces a candidate stop every bar, and a ratchet keeps the stop moving only in the trade's favor.

\text{Ratchet rule (long side shown): } \operatorname{Stop}_t = \max(\operatorname{Stop}_{t-1}, \operatorname{Cand}_t)\text{; shorts mirror every formula with } \min() \text{ and flipped signs}

\text{Percent trail: } \operatorname{Cand}_t = C_t \times \left(1 - \frac{p}{100}\right)

\text{ATR trail: } \operatorname{Cand}_t = C_t - k \times \operatorname{ATR}_t

\text{Chandelier exit: } \operatorname{Cand}_t = \operatorname{HH} - k \times \operatorname{ATR}_t

\text{Donchian trail: } \operatorname{Cand}_t = \operatorname{LL}

\text{MA trail: } \operatorname{Cand}_t = \operatorname{MA}_t\text{, exiting on a close below it}

\text{Swing trail: } \operatorname{Cand}_t = \text{the latest confirmed swing low (a low with higher lows for several bars on each side)}

\text{Parabolic SAR: } \operatorname{SAR}_{t+1} = \operatorname{SAR}_t + \operatorname{AF} \times (\operatorname{EP} - \operatorname{SAR}_t)\text{, with } \operatorname{AF} \text{ starting at } 0.02\text{, stepping } 0.02 \text{ at each new } \operatorname{EP}\text{, capped at } 0.20

\text{Profit-lock ratchet: once price moves } R \text{ in the trade's favor, raise } \operatorname{Stop}_t \text{ to at least the entry price (breakeven), stepping the lock up at further multiples of } R

t: bar index (t-1 is the prior bar)

C_t: close of bar t

Stop_t: trailing stop level in force at bar t

Cand_t: candidate stop produced by the chosen method at bar t

p: trail distance in percent (e.g. 8)

k: ATR multiple (3 in the standard chandelier, otherwise commonly 2 to 3)

ATR_t: Average True Range at bar t (22-period in the standard chandelier, otherwise commonly 14)

HH: highest high since entry, or of the last 22 bars in the standard chandelier

LL: lowest low of the Donchian lookback (commonly the last 10 or 20 bars)

MA_t: moving average value at bar t (e.g. a 20-period EMA)

SAR_t: parabolic SAR stop level at bar t

EP: extreme point, the highest high (long) or lowest low (short) reached during the current trade

AF: acceleration factor (starts at 0.02, rises 0.02 at each new EP, capped at 0.20)

R: initial risk per unit, entry price minus the initial stop

Canonical settings: the chandelier exit is HH over 22 bars with k = 3 (Chuck LeBeau); the Donchian exit uses the 10- or 20-bar low (Turtle rules); the SAR recursion is Wilder's, omitting its reversal and clamping rules.

Volatility-adaptive trails recompute k × ATR_t each bar so the stop distance breathes with volatility, while the SAR tightens parabolically as AF grows.

Whether an exit fires on an intrabar touch or only on a bar close is an implementation choice that changes results.

How traders use it

As shared vocabulary for comparing exits: describing a method as an N-bar channel trail or a 3 × ATR chandelier states its anchor, update rule, and tightening profile precisely, which makes backtests comparable across systems.
As a regime-matching guide: volatility trails adapt their distance to current conditions, structure trails respect the levels trends typically retrace to, and channel trails are slow but hard to shake; which behavior helps depends on whether the market trends cleanly or chops.
In layered exits: many systems run a wide disaster stop from one family alongside a tighter profit-lock ratchet from another and honor whichever line is closer at any moment.
As the alternative to fixed targets: trend-following systems usually trail because a preset target caps the right tail of outcomes, while mean-reversion trades usually prefer a profit target because the expected move is bounded.

Trailing Method Taxonomy vs related concepts

Volatility Stop: One member family, not a rival: the k × ATR trails. The taxonomy is the map, and the volatility stop is one of its most heavily implemented regions.

Parabolic SAR: Also a member: a parametric trail whose distance tightens by an acceleration factor as new extremes print, rather than tracking structure, an average, or an ATR multiple.

Profit Target Taxonomy: The other half of exit design. Targets predefine a level to exit into strength; trailing methods follow from behind and exit only after price has already turned.

Stop-and-reverse: An exit behavior, not a trailing family: almost any trail can be run stop-and-reverse, flipping the position on a cross instead of going flat.

More Trailing Method Taxonomy implementations

Concept family

Risk, Sizing & Exits

37 concepts mapped · 37 in the Library

Trailing Method Taxonomy FAQ

Which trailing stop method is best?

None dominates. Tight trails cut giveback but get stopped by routine pullbacks; loose trails survive the pullbacks but return more open profit at the end. The useful question is how far the market you trade normally retraces within a trend, and testing candidate families against that behavior. Treat any published default as a starting point, not an answer.

What is the difference between a trailing stop and a fixed stop?

A fixed stop stays where it was placed and marks the level where the trade idea is wrong. A trailing stop moves in the trade's favor as price advances, converting open profit into protected profit. Many systems use both in sequence: a fixed initial stop, handed off to a trail once the position is meaningfully in profit.

Should a trailing stop ever widen?

Convention says no: a trail tightens or holds, never loosens. Volatility-based levels recalculated each bar would drift away from price when ranges expand, so most implementations add a ratchet that keeps the tightest level reached. Widening after entry re-adds risk that had already been retired, which defeats the purpose of trailing in the first place.

Do trailing stops improve results?

Not guaranteed. A trail reshapes the distribution of outcomes rather than adding edge: fewer large winners round-trip to nothing, and more trades scratch out on noise. Whether that nets out better than fixed targets depends on how often the market trends versus chops, which is why the choice should be tested per market and timeframe, not assumed.

What is a profit-lock ratchet?

A stepped trail. Instead of following price continuously, the stop jumps at preset milestones: to breakeven once the trade reaches a chosen multiple of risk, then to lock in a set fraction of open profit at later ones. Between steps it stays put, which avoids reacting to every bar but leaves profit less protected mid-step.

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