Rounding Bottom (Saucer) — Catching the Long Accumulation

Rounding bottom — also called a saucer — is a pattern almost nobody trades, because almost nobody sees it. It builds over months, has no spectacular candles, and triggers no alerts. On a daily chart it looks like boredom. And it's precisely in that boredom that some of the best statistics in the entire pattern catalog are hiding.

In Thomas Bulkowski's measurements (990 cases, US stocks) the rounding bottom has a 4% failure rate — one of the lowest results in the catalog — and an average rise of 48% after the breakout. Overall ranking: 7th place out of 39 bullish patterns. For comparison: the internet's beloved flags have around a 45% failure rate, and the falling wedge — 26%.

There's just one catch, and it's a big one: in practice the saucer more often continues a trend than reverses it. Textbooks have described it for decades as a "long-term reversal of a bear market" — the data say something else. More on that below.

How to Identify a Rounding Bottom

Bulkowski's identification criteria:

1. A gentle, bowl-shaped arc — price declines, flattens out and reverses just as gently. The shape of a half-moon, not the letter V. A sharp low with a bounce is a different pattern with different statistics.
2. Weekly chart. The pattern is stretched out enough in time (usually many months) that on a daily chart the arc disappears into the noise. Bulkowski's explicit advice: look for it on the weekly, where the rounding is visible to the naked eye.
3. Trend before the pattern: usually bullish. In 67% of cases price enters the saucer from above — the pattern then acts as a continuation, a pause in an uptrend, not a reversal of a bear-market bottom.
4. A "bump" halfway through the arc. A characteristic trap in this pattern: roughly around the bottom, price can shoot up, then return almost to the point where that spike started — and only then does the arc close out properly. Anyone who bought into that spike "because it's already reversing" will give back most of the move.
5. Confirmation: a close above the saucer's left rim (the high where the arc began). Bulkowski uses the left rim because price on the right side often doesn't even pause at the height of the right rim. Without this close, the pattern is unconfirmed and there's no signal.
6. The handle variant. If price builds a shallow pullback (handle) at the saucer's right rim, the whole thing starts to resemble a cup and handle — the saucer's closest relative, covered separately.

What the Numbers Say (Bulkowski, Encyclopedia of Chart Patterns)

A quick reminder of the terms:

• Break-even failure rate — how often price, after a confirmed breakout, didn't even move 5% in its direction.
• Average rise — from the breakout price to the high before a 20% decline, measured on perfect trades. A comparison value between patterns, not a forecast of your own profit.
• Throwback — a return of price to the breakout level within 30 days.
• Target % — how often price reaches the measure-rule target.

Rounding bottom, bull market, n=990:

A 4% failure rate is a result from the absolute top of the catalog — 96 out of 100 confirmed breakouts move price at least 5% higher. An average rise of 48% beats most "famous" patterns. And a 64% throwback rate means price typically returns to the vicinity of the line once more after the breakout — you don't need to chase the breakout candle.

Two observations outside the table round this out. First, the aforementioned 67% of cases with an uptrend before the pattern: statistically the saucer is more often a pause in a trend than a reversal. Second, a flat base before the arc (several months of sideways movement before entering the pattern) precedes the strongest rallies after the breakout.

It's also worth comparing the saucer with its more famous relative, the cup and handle. The cup has an even better failure rate (5%) and a higher average rise (54%), but in practice it's the same mechanism: a long, gentle accumulation ending in a breakout above the rim. If the saucer grows a handle at the right rim, the two patterns literally merge — and both belong to the top tier of the catalog. The takeaway is simple: the market pays unusually well for patiently built, bowl-shaped bases, whatever you call them.

Disclaimer, as always: the measurements cover US stocks on the daily/weekly chart, mostly in a bull market. Nobody has replicated this table for crypto or forex — treat the numbers as a reference point, not a guarantee that transfers between markets.

How to Trade a Rounding Bottom

Basic entry: after confirmation. Buy on a close (on your decision timeframe — for this pattern, sensibly, the weekly) above the saucer's left rim. Yes, that means giving up a sizable chunk of the move from inside the arc. In exchange you get the statistics above — they're measured from the confirmation point, not the bottom.

Target: measure rule. Pattern height (left rim minus the lowest point of the arc) × 65%, added to the right rim. The full height as a target is the optimistic case — it works less often.

Stop: logically, below the right rim of the arc or below the last clear low before the breakout. The pattern is stretched out, so a stop below the saucer's very bottom can be absurdly far away — in that case, either size the position smaller or use a closer technical stop and accept that the throwback (64%!) might shake you out.

Handle variant: if a handle forms at the right rim, draw a line from the left rim through the right one and extend it above the handle — enter on a close above that line. This only works with a downward-sloping line.

Swing play on the "bump": aggressive traders can sell the spike halfway through the arc and buy it back after price returns near its base — price usually comes back almost (not entirely) to the point where the spike started. This play is for those already tracking the pattern; don't open a short in the middle of a bullish pattern just "because there'll be a bump."

What to avoid: buying in the middle of the arc "because it's already rounding" (the bump will run you over), trading a saucer on the daily chart where it isn't visible on the weekly, and ignoring the throwback — after the breakout, price retests the area around the rim once more in nearly two-thirds of cases. Throwbacks statistically worsen the subsequent result, so when one happens, manage the position tighter.

Crypto context: multi-month, bowl-shaped bases do show up on BTC and on alts after capitulations — but remember the table above was built on US stocks. On crypto, patterns of this caliber tend to get whipsawed by fake breakouts more often than on S&P names, so treat the (weekly!) close-above-the-rim condition even more literally.

Myth vs Measurement

Myth: "The rounding bottom is a major reversal pattern — it ends a bear market and starts a bull run. Look for it after long declines."

Measurement: in 67% of cases price enters the saucer from above, after a rise — the pattern continues a trend twice as often as it reverses one. The textbook "reversal" label describes the minority of cases. For a trader, that's good news: you don't need to hunt for bear-market bottoms (a pursuit as romantic as it is deadly for your account). It's enough to recognize a multi-month, bowl-shaped pause inside an ongoing uptrend — and wait for a close above the left rim.

A second myth — "the saucer is exotic, it barely occurs" — also falls apart under measurement: 990 cases in the database is a solid sample. The pattern isn't rare. It's invisible to people who never switch their chart above the daily. The saucer's entire "mystery" comes down to one keystroke: W1.

No sugarcoating: the rounding bottom isn't flashy and doesn't make for a screenshot captioned "THIS IS ABOUT TO EXPLODE." But it's one of the few patterns where a low failure rate, a high average move, and a clear confirmation rule all show up at the same time. Boredom that pays — the exact opposite of most of what you see on trading Twitter.

FAQ

Is the rounding bottom a trend-reversal pattern? Usually not — in 67% of cases price enters the pattern from above, and the saucer acts as a continuation of the uptrend. The "reversal" label from textbooks describes the minority of cases, though the post-breakout statistics are excellent in both variants.

What timeframe should you look for a saucer on? The weekly. The pattern builds over months and gets lost in the noise on the daily — Bulkowski explicitly recommends the weekly timeframe, where the bowl-shaped arc is visible right away.

Where's the confirmation and the target? Confirmation: a close above the saucer's left rim. Target: pattern height × 65%, added to the right rim — reached 65% of the time. A throwback follows the breakout 64% of the time, so you'll usually get a second chance to get in.

FAQ

Rafał — Krypto Bez Ściemy

Trader and founder of Strefa Tradingu. He’s been breaking crypto down on YouTube for years — no hype, no signals, with a focus on market structure and risk management.

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