Does the stock price rise when the Bollinger Bands narrow?
An indicator where the bands around the price widen or narrow based on the magnitude of recent movements.
Table of contents
Remember this first
First, 3 things to remember
- 1The middle line reflects the average, while the upper and lower lines reflect price volatility.
- 2A narrow band means that recent volatility has been low.
- 3Even if the bands narrow, it does not indicate the next direction.
Think of it as drawing a band around the price.
Bollinger Bands are an indicator that adds two lines above and below a moving average. The width of the bands is determined by calculating how spread out the price is around the average. This number representing the spread is called the standard deviation.
There is no need to memorize the formula right now. Start by observing that the bands can widen when price volatility is high and narrow when it is quiet.
Just because it is quiet does not mean it will necessarily jump upward.
A narrowing of the bands is also called a squeeze. It indicates that recent price movement has become smaller. Whether it moves up or down afterward is a separate matter.
Check which direction it moves when volatility actually increases, whether trading volume has risen, and if there is any new news. Do not assume an upward trend just because the bands are narrow.
The band is not an impassable fence.
A strongly rising stock price may move along the upper band. This does not necessarily mean you must sell just because it touched the top. The same applies to the bottom.
The bands change if the chart's time period setting is changed. Do not take probability learned in mathematics and conclude that the price will stay within this range by a certain percentage.
You should not make such assumptions
“Since the band has narrowed, will it rise significantly?”
This information indicates that price volatility has been lower recently. It is impossible to know in which direction or by how much it will move next.
Check what you have read.
- Have you checked the calculation period for the bands?
- Have you separated the narrowing of the band from the direction?
- Have you ever seen a case where it continued to move outside the bands?
Apply what you read to the actual screen
Try it on WAPE
Source and scope of verification
Reviewed · Version 2
- Bollinger BandsNew window
Fidelity Investments · Verify 2026-10-20
Moving average, standard deviation bands, and volatility
This is educational material for observation and information comprehension. Hypothetical examples do not represent actual stocks or performance and do not provide buy or sell recommendations.