Piercing Line

The Pattern

A Piercing Line forms over two consecutive bars:

1. A down-bar continues an existing downtrend.
2. The next bar opens at or below the prior bar’s low, then rallies and closes above the midpoint of the prior bar’s body but below the prior bar’s open.

The second bar pierces back into the down-bar’s territory without fully engulfing it. The closing requirement (above the midpoint, below the open) is what separates this from weaker rejection setups.

The Story Behind It

The pattern is often described as a “half engulfing” or a partial recovery. The bearish session created a price low and an opening gap down extended that pessimism, but buyers stepped in hard enough to push price back into the prior session’s body. Classical analysts treat the midpoint cross as the threshold: closing back through it indicates the bearish session’s price control has been meaningfully eroded, even if not completely flipped.

In the Western literature the pattern is often paired with Dark Cloud Cover, its bearish mirror. The reliability is usually treated as somewhere between a Bullish Harami (weaker) and a Bullish Engulfing (stronger).

When It Tends To Work

• After a clean, multi-bar decline where the down-bar was a continuation rather than an isolated drop.
• When the gap-down open is meaningful, ideally to a previously held support level. The recovery from there carries more information than a recovery from a marginal gap.
• When the closing price not only crosses the midpoint but reaches into the upper third of the prior bar’s body.

When It Tends To Fail

• When the up-bar fails to truly pierce the midpoint. The pattern is binary on this threshold and weak setups close just above the midpoint with little buying conviction behind them.
• In strong trending declines that resume the next session. The hold period exits before any reversal develops.
• When the gap-down open was small. The wider the gap, the more meaningful the recovery.

How This Strategy Trades It

Enter long at the close of the piercing bar. Hold for hold_bars sessions (default 5), then flatten unconditionally.

What The Backtest Says

Piercing Line is a rare pattern, and that shows up everywhere in the sample numbers. Over 2020-2024 on daily bars:

• Nasdaq (NQ): 5 trades, 4 winners, +$31,456, max drawdown 2.6%
• S&P 500 (ES): 5 trades, 3 winners, +$20,361, max drawdown 0.8%
• Gold (GC): 1 trade, won, +$2,786

The per-trade numbers look excellent (very high profit factors, tiny drawdowns) but the fire counts are too small to draw strong conclusions. Five trades over five years is the kind of sample where one bad trade can erase the entire reported edge. Read the headline as “did not lose money on three liquid futures over a five-year window” rather than as a validated systematic edge. A larger sample (more years, more instruments, lower-timeframe variants) would be needed to call this real.

Related Patterns

• Dark Cloud Cover: the directional mirror.
• Bullish Engulfing: the stronger version, the up-bar closes above the prior open rather than just above the midpoint.
• Bullish Harami: a different two-bar reversal, body inside body instead of body crossing through body.

Try It Yourself

The default preset uses 1-contract sizing on NQ daily bars. The form lets you change the contract, timeframe, hold length, and contract count.