Rounded Bottom
A rounded bottom, or saucer, is a slow reversal in which the downtrend decelerates, price flattens out, and an uptrend gradually takes over, producing a smooth, curved base with no sharp low. It reflects a gradual handover from sellers to buyers rather than a single capitulation.
- Bias
- Bullish
- Category
- Chart Patterns
- Scan cadence
- Every close
What has to be true for a Rounded Bottom to trigger
- A prior downtrend that gradually loses momentum
- A smooth, curved base without a sharp V low
- Price spending real time near the lows rather than snapping back
- A gradual recovery toward the left side of the base
- Volume often heaviest at the edges and lightest at the bottom
How PatternGrade grades it
The smoother and more symmetrical the curve, and the longer the base, the higher the grade. Sharp lows or an asymmetric shape grade lower.
Every scanner grades its hits A+, A or B from the pattern's own measurable structure. The grading is deterministic — the same chart always produces the same grade. It describes how closely the chart matches the pattern, not how likely anything is to happen; no hit rate or probability is attached to a grade. The reasoning is set out in the methodology.
What a Rounded Bottom looks like in practice
A stock declines from $44 to $27 over five months, but the last stretch of that decline slows markedly. Ranges narrow, each new low is only marginally below the last, and the bars start overlapping. Price spends about six weeks meandering between $27 and $30 with no clear direction, then begins making higher lows almost imperceptibly. Four months later it is at $36 and the chart shows a smooth bowl with no sharp low anywhere in it.
How a Rounded Bottom fails
The curve flattens and then rolls back over, producing a long sideways drift that never resolves upward. Rounded bottoms are slow by construction, which makes them hard to invalidate quickly. There is no single level whose loss says the pattern is dead. That is their main practical weakness: a failing rounded bottom looks almost identical to a forming one for weeks. Volume is the earliest tell; the pattern needs volume to expand as price lifts out of the right side, and a right side that advances on declining volume is usually a drift, not a reversal.
What this pattern is telling you
Rounded bottoms take a long time to form and often lack a crisp trigger, which makes risk harder to define than in a flag or a box.
PatternGrade is not a financial advisor and does not give buy or sell recommendations. Targets and stops shown on a pattern are reference levels derived from its geometry, not advice.
How to scan for Rounded Bottom setups
PatternGrade rescans every liquid US stock (~4,500 names) for this pattern after every close and returns the hits as a graded list, with the pattern drawn on each chart, so you review setups rather than hunt for them.
Join the waitlist to be invited when sign-ups reopen and see the current Rounded Bottom list, or browse all 75 patterns.
Rounded Bottom FAQ
What is a saucer bottom?
Another name for a rounded bottom: a slow, curved base marking a gradual shift from downtrend to uptrend.
How long does a rounded bottom take to form?
Months, usually. Three to twelve on daily bars, and longer still on higher timeframes. The pattern describes a gradual transfer of ownership from sellers to buyers, and that process is slow by nature. A rounded bottom that forms in three weeks is not really the pattern.
Is a rounded bottom reliable?
When it completes it tends to be durable, because the base is broad and there is little overhead supply left. The difficulty is timing: the pattern gives no crisp entry and no crisp invalidation, so it can absorb a great deal of patience before resolving either way.
What confirms a rounded bottom?
A move above the level of the left rim on expanding volume. Until that happens the stock is in a long, quiet range, and quiet ranges resolve in both directions.
How does PatternGrade grade a rounded bottom?
The grade rewards genuine symmetry, an absence of sharp spikes in the base, volume that contracts through the low and expands on the right side, and a base long enough to be meaningful. A lopsided base with a sharp low grades poorly because it is really a V, and V-shaped lows behave differently.
Patterns a Rounded Bottom is mistaken for
- Double Bottom
- A double bottom has two identifiable spikes down. A rounded bottom has none: the low is an area, not a point.
- Cup & Handle
- Both are curved, but a cup and handle forms after an advance and requires a handle. A rounded bottom forms after a decline and has no handle requirement.
- Stage 2 Uptrend
- Weinstein's Stage 1 is the rounded basing area and Stage 2 is the advance that follows. A rounded bottom is roughly the transition between them; the Stage 2 scan fires later, once the trend is established.
Last reviewed . Structure and grading for the Rounded Bottom are reviewed against the scanner's own rules.