Double Top Double Bottom Pattern: M and W Reversals

Key Takeaways

• A double top requires two peaks at similar levels with a meaningful trough between them; the pattern is only confirmed by a close below that trough.
• Bulkowski's research suggests the measured target, pattern height projected from the break, is reached somewhat less than half the time.
• Shorting at the second peak before the support break is guessing, not trading a confirmed pattern.
• On daily charts, genuine double tops and bottoms typically take weeks to months between the two peaks, not days; two-day doubles are noise.

What It Is

A double top forms after an uptrend. Price rallies to a peak, pulls back, rallies a second time to roughly the same peak, and fails. The trough between the two peaks defines a support level. When price closes below that trough, the pattern is confirmed and a downtrend is signaled.

A double bottom is the mirror image at the end of a downtrend. Price drops to a low, bounces, drops again to roughly the same low, and bounces a second time. The peak between the two troughs acts as resistance. A close above that peak confirms the reversal.

Bulkowski's research classifies the pattern by whether the two tops or bottoms are rounded (Eve) or sharp (Adam), producing four shape variants: Adam & Adam, Adam & Eve, Eve & Adam, Eve & Eve.

The Intuition

At a double top, buyers drove price to a high, took profits, and tried again. The second attempt failed at the same ceiling, and the sellers stepped in more forcefully. The level stopped being a wall to punch through and started being a lid. A double bottom tells the same story in reverse: sellers tried twice, failed twice, and demand took control.

The pattern is really a failed continuation. The more times a level rejects price, the more significant that level becomes in the minds of participants.

How It Works

Five elements are required:

• A clear prior trend (up for a double top, down for a double bottom)
• Two peaks (or two troughs) at similar levels, typically within a few percent of each other
• A meaningful separation between them in time (weeks or months on daily charts is typical; very close peaks are often just noise)
• A reaction in the middle that is substantial (Bulkowski's work cites roughly a 10 to 20 percent move as typical)
• Confirmation when price closes beyond the intervening trough (or peak)

The measure rule from Bulkowski and StockCharts takes the height of the pattern and projects it from the confirmation break. For a double top with peaks at 100 and an intervening trough at 90, the height is 10. Breaking below 90 projects a target near 80. Studies suggest the target is reached somewhat less than half the time, so practitioners often treat it as a guide rather than a guarantee.

Volume typically declines on the second peak of a double top and expands on the break below support. For double bottoms, volume expansion on the breakout above the intervening peak is considered important confirmation.

Worked Example

Consider a stock that rallies from 60 to 100. It pulls back to 88, then rallies again, stalling at 101 before turning lower. Two peaks near 100-101, trough at 88. The pattern is not yet confirmed.

Price then drifts back down and closes at 87 on heavy volume. The intervening trough has broken. The measure rule takes the height (100 minus 88 equals 12) and projects it down from 88, giving a target near 76. A trader using the pattern might place a stop above the 101 peak and watch for the projected move to the high 70s.

If instead price had broken to a new high above 101 without breaking 88, the double top would be invalidated. Many candidate patterns resolve exactly that way, which is why waiting for confirmation matters.

Common Mistakes

• Calling every retest a double top. Uptrends routinely pull back and retest recent highs. If the first peak did not end a meaningful advance or the second peak comes only days later, the setup is probably a pause rather than a reversal. Genuine doubles usually have weeks to months between the two peaks on a daily chart.
• Trading inside the pattern. Shorting at the second peak before the intervening support breaks is a guess, not a confirmed signal. The pattern specifically requires the support or resistance break to be valid.
• Ignoring the size of the intervening move. If the pullback between the two peaks is only a couple of percent, you do not have a double top, you have noise in a tight range. Bulkowski's own setup rules call for a substantial reaction between the peaks.
• Small timeframes. On a 1-minute chart, double tops and bottoms appear constantly and rarely mean anything durable. The pattern's research base is built on daily charts.
• Forgetting the market context. A double top inside a strong secular uptrend can fail. Aligning patterns with the broader trend and volume profile raises the odds of a clean signal.

Frequently Asked Questions

Q: What is a double top pattern in simple terms? A double top is when price rallies to a high, pulls back, rallies again to roughly the same high, and fails. It looks like the letter M. The pattern is confirmed when price closes below the trough between the two peaks, suggesting the uptrend has ended.

Q: How does a double top or double bottom affect investment decisions? It gives investors a defined reversal signal with a built-in stop level (above the second peak) and a projected target (below the intervening trough). Portfolio managers can use the break of the trough as a systematic exit from a long position rather than relying on a gut call.

Q: What is a real-world example of a double top? Many commodity prices in 2022 formed double tops as they re-tested the peaks set during the initial supply shock. When they broke the intervening support zones on heavy volume, it confirmed the tops and preceded multi-month declines in energy and metals prices.

Q: How can investors use double top and double bottom patterns practically? Only act on the confirmation, the break of the intervening trough or peak, not on the formation of the second peak. A simple rule: require that the two peaks or troughs be separated by at least several weeks on a daily chart; quick retests are usually just noise.

Q: How is a double top different from a head and shoulders pattern? A double top has two peaks of similar height separated by a trough. A head and shoulders has three peaks, with the middle one higher, providing an additional failed rally before the reversal confirms. Both are M-shaped tops, but the head and shoulders adds an extra layer of evidence for the reversal.

Sources

1. StockCharts ChartSchool. "Double Top Reversal." https://chartschool.stockcharts.com/table-of-contents/chart-analysis/chart-patterns/double-top-reversal
2. StockCharts ChartSchool. "Double Bottom Reversal." https://chartschool.stockcharts.com/table-of-contents/chart-analysis/chart-patterns/double-bottom-reversal
3. Bulkowski, T. "Bulkowski's Double Top Study." https://www.thepatternsite.com/dtstudy.html
4. Investopedia. "Double Top and Bottom." https://www.investopedia.com/terms/d/doubletop.asp

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.