Double Top / Double Bottom
A double top is a chart pattern in which a security reaches approximately the same price high on two separate occasions with a moderate pullback in between, historically associated with a potential reversal of an uptrend; a double bottom is the inverse pattern, with two similar lows potentially signaling a reversal of a downtrend.
The double top and double bottom are among the most discussed reversal patterns in technical analysis literature, appearing in foundational texts from Edwards and Magee to more modern charting guides. Their prevalence in technical analysis education reflects both their visual clarity and the frequency with which price charts produce formations resembling these shapes.
In a double top, price advances to a high, retreats to an intermediate support level called the neckline, then rallies again to approximately the same high before failing to sustain that level. Technical analysts have historically interpreted the second failed attempt at the prior high as evidence that selling pressure is exceeding buying pressure at that level — that the prior high is acting as resistance. The pattern is considered confirmed in most technical frameworks when price breaks below the neckline level on meaningful volume, suggesting a shift from the prior uptrend.
The double bottom is the mirror image: price declines to a low, recovers to an intermediate resistance level (the neckline), then tests approximately the same low before recovering more sustainably. Confirmation is traditionally identified as a decisive close above the neckline. The distance from the neckline to the pattern low (the depth of the pattern) is sometimes projected upward from the neckline as a rough price objective — a technique known as the measured move.
Critical considerations for evaluating these patterns include the symmetry and timing of the two highs or lows, the volume characteristics (historically volume on the second top or bottom has been noted to be lower than on the first in confirmed patterns), and the overall market and sector context. Double tops and bottoms that form over longer time frames — multiple weeks or months — have historically been considered more significant than those forming over days. False signals — patterns that appear to confirm but reverse direction again — are a documented limitation of all reversal pattern analysis.