Large-scale tests on SPX, QQQ, and SMH reveal that range compression does not lead to volatility expansion. Instead, the deepest squeezes are followed by the calmest periods.
A squeeze happens when a bar’s range gets noticeably smaller than the bars before it. Many traders see this as price coiling up and getting ready for a big move. They wait for the range to expand and then try to trade the breakout.
We wanted to test whether that big move actually shows up. We looked at every day in the full history of the S&P 500, Nasdaq 100, and semiconductor stocks. For each squeeze, we measured how large the next day and the next week were compared to a normal day or week.
There is no single definition of a squeeze, so we tested four versions, from the loosest to the strictest:
The first two are simple, everyday definitions. A three-day range contraction happens a few percent of the time, while an NR7 occurs about once every seven days. The last two are stricter, statistical versions that scanners typically flag as meaningful compression. These appear roughly once every ten days for the bottom 10%, and once every twenty days for the bottom 5%.
| Next-day range vs a normal day | |||
|---|---|---|---|
| Squeeze definition | SPX | QQQ | SMH |
| Range shrinks 3 days straight | +4% | −8% | +2% |
| Narrowest range in 7 days | −4% | −8% | −6% |
| Range in bottom 10% (60 days) | −13% | −19% | −14% |
| Range in bottom 5% (60 days) | −16% | −22% | −18% |
| Band width in bottom 10% (6 months) | −13% | −15% | −6% |
The loose definitions show little effect. After a three-day range contraction or an NR7, the next day’s range comes in close to average, sometimes a bit smaller.
The stricter squeezes show no volatility expansion either. When the daily range falls into the bottom 10% of its last two months, or when Bollinger Band width reaches a low, the following day’s range is 13% to 19% smaller than normal across all three assets. The compression does not release right away. It continues.
Give it a full week instead of a day and the result is the same.
| Next-week range vs a normal week | |||
|---|---|---|---|
| Squeeze definition | SPX | QQQ | SMH |
| Range shrinks 3 days straight | +3% | −5% | +5% |
| Narrowest range in 7 days | −4% | −5% | −2% |
| Range in bottom 10% (60 days) | −13% | −18% | −10% |
| Range in bottom 5% (60 days) | −14% | −20% | −11% |
| Band width in bottom 10% (6 months) | −13% | −13% | −2% |
The tighter the squeeze, the quieter the result
The most revealing comparison is between the bottom 10% and bottom 5% squeezes. If tighter compression built up more energy, the bottom 5% should produce bigger moves than the bottom 10%. The opposite happens. On the Nasdaq, the week after a bottom-10% squeeze is 18% quieter than average, while the week after a bottom-5% squeeze is 20% quieter. The same pattern appears on the next day. The tighter the squeeze, the smaller the move that follows.
A very quiet range usually means the market is simply in a calm period, and calm periods tend to last longer than most traders expect. This is why the deepest squeezes are followed by the quietest stretches.
None of the squeeze definitions give any clue about which way price will go next. After every type of squeeze, the percentage of green days stays very close to each index’s normal baseline — around 53% on the S&P 500, 54% on the Nasdaq, and 52% on the semiconductors. The same pattern holds over the following week.
A squeeze provides no useful signal on direction. And as the earlier results showed, it also fails to predict how large the next move will be.
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