Bollinger Squeeze
A Bollinger squeeze looks for a quiet period when a stock's price range tightens sharply, then trades the breakout that often follows when volatility expands again.
A Bollinger squeeze is a volatility strategy. It is based on a pattern markets repeat over and over: quiet periods are followed by active ones. When a stock trades in an unusually narrow range — a 'squeeze' — it is often coiling up for a larger move. The strategy waits for that calm, then enters in the direction price breaks once volatility returns.
How Bollinger Bands measure the squeeze
Bollinger Bands wrap a stock's price in an upper and a lower band set a couple of standard deviations away from its 20-day average. When the market is calm, the bands pull in close together; when it is volatile, they spread far apart. The distance between the bands is called the bandwidth.
A squeeze is identified when bandwidth drops to an unusually low level — for example, its narrowest reading in the last 20 days. That is the signal that a stock is unusually quiet. The trade is then triggered when price closes outside a band, suggesting the breakout has begun.
A worked example
The figures below are illustrative, not live prices:
| Day | Close (PKR) | Band width (PKR) | What's happening |
|---|---|---|---|
| Mon | 150.0 | 12.0 | Normal volatility |
| Tue | 150.5 | 7.0 | Bands tightening |
| Wed | 150.2 | 4.5 | Squeeze — narrowest in 20 days |
| Thu | 154.0 | 6.0 | Price closes above upper band — breakout up |
| Fri | 157.5 | 9.5 | Volatility expanding, move underway |
By Wednesday the band width has shrunk to 4.5 — the tightest in weeks — flagging a squeeze. On Thursday price closes above the upper band and the width starts widening again, so the strategy enters long and rides the expansion.
Strengths and limitations
- Strength — it times the calm before the move. Rather than chasing, you prepare during the quiet and act when volatility returns.
- Strength — favourable risk shape. Squeezes tend to break into clean moves, so a tight stop near the squeeze range can pair with a larger potential gain.
- Limitation — direction is unknown in advance. A squeeze tells you a move is likely, not which way. You have to wait for the break, and sometimes it breaks the 'wrong' way.
- Limitation — false starts. Price can poke outside a band and fall back. Confirmation — a close beyond the band rather than an intraday touch — reduces these.
Build a Bollinger squeeze strategy on PSX Algos
PSX Algos ships a Bollinger squeeze starter template, plus ready-made volatility building blocks like band width and %B in the builder. Define your squeeze condition and the breakout trigger, then backtest it across a decade of PSX history to see how the breakouts resolved before trading it live.
Open the Bollinger Squeeze template →Frequently asked
What is a Bollinger squeeze in simple terms?
It is when a stock's price range gets unusually narrow, shown by Bollinger Bands pulling close together. It often precedes a larger move, and the strategy trades the breakout that follows.
Does a squeeze tell you which way price will break?
No. A squeeze signals that a move is likely but not its direction. Traders typically wait for price to close outside a band to confirm the direction before entering.
How do you measure a Bollinger squeeze?
By the band width — the distance between the upper and lower bands. A squeeze is flagged when band width falls to an unusually low level, such as its narrowest reading over the last 20 days.
What is the difference between a squeeze and a breakout strategy?
A squeeze focuses on the volatility setup — the quiet period before a move — while a momentum breakout focuses on price clearing a recent high. The two often combine: a squeeze identifies the coil, the breakout confirms the release.