Rounding Top Complete Guide

What is Rounding Top?

The Rounding Top is a long-term bearish reversal pattern that signals a gradual shift in market sentiment from bullish to bearish. Visually, it resembles an inverted 'U' or a dome, representing a slow transition where buyers lose momentum and sellers gradually take control. Unlike the sharp peaks of a Double Top or Head and Shoulders, the Rounding Top is characterized by its smooth, curved appearance, often taking several weeks or months to fully develop. According to Thomas Bulkowski in the 'Encyclopedia of Chart Patterns,' this formation is relatively rare compared to other reversal patterns but carries significant weight when it appears. The formation begins with an upward trend that starts to flatten out as buying pressure wanes. The price reaches a high point and then begins a slow descent. A key characteristic is the volume profile; Bulkowski observes that volume often follows a 'U' shape, being higher at the start and end of the pattern and lower in the middle, though it can also be irregular. The pattern is confirmed when the price breaks below the 'neckline' or the support level established at the start of the curve. In terms of performance, Bulkowski’s data suggests that Rounding Tops have a relatively low failure rate (approximately 9% to 12% in bull markets) once a downward breakout occurs. The price target is typically calculated by measuring the height of the pattern from the highest peak to the support level and projecting that distance downward from the breakout point. Traders should be patient, as the rounding process requires significant time—often 40 bars or more—to ensure the trend change is structural rather than a temporary consolidation.

Identification Rules

1. Prior Trend: A clear and established uptrend must precede the formation.
2. Shape: Price action must form a smooth, convex curve (dome) without sharp, jagged spikes.
3. Duration: The pattern typically requires at least 40 bars to ensure a valid rounding transition.
4. Confirmation: A decisive close below the support level (neckline) identified at the start of the dome.

References

• Thomas N. Bulkowski (2005). Encyclopedia of Chart Patterns.
• Steve Nison (2001). Japanese Candlestick Charting Techniques.

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