Neckline

What Is a Neckline?

A neckline is a line drawn on a stock or other asset's price chart that connects key points in a chart pattern. It is used in technical analysis to mark a level that price must move through before a pattern is considered complete. The name comes from the head and shoulders pattern, where the line runs across the "neck" between the shoulders.

Neckline analysis is mainly associated with reversal patterns such as the head and shoulders pattern, the double top, and the double bottom. In each case, the neckline is drawn through the troughs or peaks that form between the price swings.

How the Neckline Works

In a head and shoulders top, which often appears after an uptrend, the neckline connects the two low points on either side of the central peak. The line acts as support. When price falls below it, analysts often view the pattern as complete and treat the move as a possible sign that the prior uptrend is ending.

In an inverse head and shoulders, which can form after a downtrend, the neckline connects the two peaks on either side of the lowest trough and acts as resistance. A move above it is viewed as a possible sign of an upward reversal.

Breakouts through the neckline are often compared with trading volume to judge how strong the move is. Higher volume during a breakout is sometimes taken as a sign of conviction, though no signal is guaranteed.

Limitations

Neckline analysis is subjective. Two analysts can draw the line at slightly different angles or heights, which can change whether a breakout appears to have occurred. Prices also frequently move back through a neckline after breaking it, a movement known as a retest, and false breakouts are common.

Because the concept depends on interpretation, many investors treat the neckline as one part of a broader view rather than a standalone signal. It is a descriptive tool for studying price history and does not predict future results.