Trading term
What is Bollinger Band squeeze?
A Bollinger Band squeeze is when the bands contract to their narrowest reading in months, signalling unusually low volatility. It's read as a warning that a large move is building — but it says nothing about which way that move will go.
Bollinger Bands sit two standard deviations either side of a moving average, so their width is a direct read on recent volatility. When a market goes quiet, that width collapses and the bands visibly pinch together. John Bollinger formalised the observation with BandWidth — the distance between the bands expressed as a percentage of the middle band — and defined the Squeeze as BandWidth hitting its lowest level in roughly six months.
The logic behind it is a genuine market regularity: volatility is mean-reverting and cyclical. Quiet periods are followed by active ones and vice versa, so an unusually quiet stretch is statistically likely to be followed by an unusually active one. That is the whole signal — a change of volatility regime is probably coming.
What the squeeze emphatically does not tell you is direction. A common sequence is the head fake: the bands expand, price breaks one way, sucks in traders, then reverses and runs hard the other way. Because of this, most traders use the squeeze as an alert to prepare rather than as a trade, and wait for the actual expansion — plus some directional evidence — before committing.
The bands pinch and BandWidth — the gap between them relative to the middle band — falls to a multi-month low. That's the squeeze: it tells you when, never which way.
For example
A stock drifts in a narrow range for six weeks. BandWidth falls to its lowest reading since January — the squeeze. Two weeks later the bands flare open and price runs $8 in five sessions. The squeeze flagged that something was coming; it took the breakout itself to reveal the direction.
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Explore Premium →Why it matters to you
Volatility is far more predictable than direction, and the squeeze is one of the few setups that exploits that asymmetry honestly. It tells you when to get ready — when to set alerts, when to have a plan for both sides, and when options are relatively cheap because implied volatility has compressed alongside realised volatility.
⚠ The squeeze has no directional opinion
The most common error is reading a squeeze near the highs as bullish, or near the lows as bearish. It is a volatility signal, full stop. Compounding this, the first break out of a squeeze frequently reverses — the head fake Bollinger himself described. Trading the squeeze itself, rather than waiting for the expansion to prove a direction, is how a good observation becomes a bad trade.