Short answer: a double bottom pattern is two troughs at a comparable price with a rally between them, appearing at the end of a decline. What it records is supply failing twice in the same zone, and the trade begins only once a candle finishes above the rally high. Its inverted twin is the double top, built on identical reasoning.
Anatomy of the structure
Four parts, each with something specific to verify.
A decline into it. Price has to arrive from above. Drawn inside a sideways range the outline exists but describes nothing, because a reversal needs something to reverse.
Trough one. A swing low where selling dries up enough for price to lift away.
The rally high. The top of that lift. This becomes the decision level, often labelled the neckline.
Trough two. A second push down that halts around the same zone. Perfect symmetry is not required. A second low a little beneath the first that snaps back hard is ordinary and entirely valid, and insisting on a tie discards most workable examples.
Geometry alone triggers nothing. The event is the close above the rally high. Before that you are looking at two lows and a bounce, a description that fits an enormous number of charts that never reverse.
| Component | What to verify | Common error |
|---|---|---|
| Prior decline | Clear and measurable | Trading the outline inside a range |
| Trough separation | Enough time between them | Calling two neighbouring candles a structure |
| Trough alignment | Comparable price zone | Insisting the lows tie exactly |
| Rally high | A distinct bounce top | Placing it at a convenient level |
| Trigger | Close above that high | Reacting to an intraperiod poke |
Confirmation worth waiting for
Three layers, ordered by how much they matter.
A settled break. On whichever interval you make decisions, a finished candle above the rally high is the floor for participation. A poke through that closes back underneath is not a premature signal, it is a rejected one.
How participation behaves. Textbooks expect crowded selling into the first low, thinner selling into the second, then a surge as the level gives way. Read plainly, that sequence says sellers stopped showing up while buyers started.
A return to the level. Price frequently comes back down to the broken high. Should the level now hold from above, the sequence is doing what it should, and entering there puts protection closer.
Our guide to the double top pattern covers the inverted version, and reading both together makes each easier to identify.
A framework for trading it
- Let the candle finish. Jumping the level early is the single most costly habit attached to this formation.
- Decide between the break and the return. Buying the break guarantees participation; waiting for the pullback improves the price and occasionally leaves you behind entirely.
- Protect beneath the deeper trough. Below that point the argument has been refuted. Protection tucked just under the rally high sits inside the ordinary movement of the structure.
- Estimate the objective. Take the depth from the trough zone to the rally high and extend it upward from the breakout as an opening target.
- Bank something into old supply. Prior resistance is where sellers genuinely return, which makes those bands more honest exits than an arithmetic projection.
- Let the protection distance set the size. Deep structures put protection far away, and repeating your usual size as that gap widens is how risk grows without any decision being made.
Borrowed funds squeeze every one of those tolerances at once. The SEC's investor guidance on margin explains how leverage multiplies results in either direction.
Risks, costs, and common mistakes
- Manufacturing it. If the two lows only align after some generous reinterpretation, there is no structure to trade.
- Using it with no decline behind it. Nothing is being reversed, and the projected move rests on nothing.
- Buying the wick. Intraperiod breaks reverse relentlessly; the close is the whole point.
- Treating the projection as owed to you. It is a symmetry estimate, not a commitment the market has made.
- Skipping the higher interval. A daily structure inside a firm weekly downtrend is a countertrend bet no matter how tidy it looks up close.
- Taking every one. Short intervals throw off the outline continually, and each marginal attempt carries spread and commission charges.
Quoted reliability figures for chart formations scatter widely, because each study drew on its own instruments, intervals and admission rules. A sample you assemble from the market you actually trade will serve you better than any number borrowed from someone else's conditions.
Traders working through a prop firm evaluation should treat reversal setups as the smaller-size category, since they trade against the prevailing direction until they work. Pivex publishes its daily and total loss limits before an attempt begins, which makes a cap on reversal attempts per session straightforward to set.
Comparison with related structures
| Pattern | Troughs or peaks | Direction | Trigger |
|---|---|---|---|
| Double bottom | Two troughs | Bullish | Close above the intervening high |
| Triple bottom | Three troughs | Bullish | Close above the highest intervening high |
| Inverse head and shoulders | Three troughs, middle lowest | Bullish | Close above the neckline |
| Rounding bottom | Gradual curve | Bullish | Break of the range top |
Three rejections carry more weight than two, so the triple variant is usually rated higher, at the price of turning up far less often. The inverse head and shoulders diverges on one point with practical consequences: because its central trough digs deepest, protection has to sit further from the entry, which changes the size the same idea can carry.
Next step: mark every double bottom pattern on the past year of your main instrument, note which produced a decisive close above the intervening high, and record how far each ran. Pivex publishes its loss limits in advance, so that sample can be turned into a rule for how much of the daily budget one reversal attempt deserves.
Related guides: support and resistance trading and the inverse head and shoulders pattern.
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