Piercing Line

The Piercing Line is the bullish counterpart to Dark Cloud Cover. It forms at the bottom of a downtrend or at support. The first session is a bearish candle consistent with the prior decline. The second session opens with a gap below the first session's close or low — extending the apparent weakness — but then rallies strongly to close above the midpoint of the first session's body. The second candle thus 'pierces' upward through the lower portion of the prior bearish candle.

Historically, the Piercing Line's narrative was one of failed continuation followed by buyer recovery. The gap lower at the open of the second session drew in sellers expecting continued downward movement, but the subsequent strong close well into the prior session's body demonstrated that buyers absorbed the available supply at lower prices and drove price higher. The fact that the second session recovered above the midpoint of the first session indicated meaningful rather than token recovery.

Penetration depth was the primary quality criterion. Historical analysts generally required that the second candle close above the 50 percent midpoint of the first candle's body. Patterns where the close reached two-thirds or three-quarters of the way up the prior body were considered stronger versions of the formation. A close that only reached 40 percent, for example, would not meet the classical definition and would be treated as a less significant pattern.

Like Dark Cloud Cover, the Piercing Line was distinguished from the Bullish Engulfing by the degree of overlap. The Bullish Engulfing requires the second candle to close above the first session's open, completely erasing and surpassing the prior session's losses. The Piercing Line requires only penetration above the midpoint, making it the less emphatic — though still historically noted — of the two bullish two-candle formations.

Volume, location within the trend, and the character of confirming subsequent sessions were all considered in assessing Piercing Line patterns in historical chart studies. A Piercing Line at a prior long-term support level with above-average volume on the recovery session was regarded as more significant than one appearing without those corroborating factors.