Close below lower Bollinger Band: breakdown or bounce?
A close below the lower band means price fell more than two standard deviations below its 20-day average. It can be a breakdown or an overdone drop.
When “Close below the lower Bollinger Band” appeared, NIFTY 200 stocks were lower 12 trading days later 41.6% of the time, against 44.7% after any day: worse than a random day: the opposite happened more often than usual.
| After | Higher | Average move | Median move | Higher after any day |
|---|---|---|---|---|
| 5 trading days | 55.0% | +0.6% | +0.5% | 53.9% |
| 12 trading days | 58.4% | +1.5% | +1.2% | 55.3% |
| 20 trading days | 56.9% | +2.0% | +1.3% | 56.8% |
Year by year
| Year | Signals | Higher after 12 days | Any day |
|---|---|---|---|
| 2021 | 375 | 62.1% | 54.4% |
| 2022 | 797 | 55.5% | 52.1% |
| 2023 | 589 | 59.9% | 61.3% |
| 2024 | 663 | 57.5% | 53.7% |
| 2025 | 422 | 60.2% | 53.1% |
| Large cap only | 1455 | 58.9% | |
| Mid cap only | 1391 | 57.9% |
What it is
A close below the lower band means price fell more than two standard deviations below its 20-day average. It can be a breakdown or an overdone drop.
How we detected it
The close is below the lower Bollinger Band (20, 2), after not being below it the day before.
How traders read it
In a strong downtrend price can ride the lower band. In a range or a rising market, closes below it are often snapped back.
A signal is a probability, not a promise
Even the most reliable signal in this study was followed by the opposite move 37% of the time. A signal tilts the odds; it doesn’t decide the outcome.
Signals work better when they agree with the trend and with each other. Whatever the signal, decide your stop-loss before you act.
Practise spotting it, free
The Bollinger Bands chapter teaches this signal in five minutes, then you call real NSE charts and get graded on your reasoning.
Common questions
Does the close below the lower Bollinger Band signal work on Indian stocks?
When “Close below the lower Bollinger Band” appeared, NIFTY 200 stocks were lower 12 trading days later 41.6% of the time, against 44.7% after any day: worse than a random day: the opposite happened more often than usual. No single signal is reliable on its own; traders combine it with the trend and manage risk with a stop-loss.
How often did stocks rise after this signal?
Across 2,846 signals on 182 NIFTY 200 stocks (2021–2025), the price was higher after 5, 12 and 20 trading days 55.0%, 58.4%, 56.9% of the time. After any day it was 53.9%, 55.3%, 56.8%.
How is “Close below the lower Bollinger Band” defined here?
The close is below the lower Bollinger Band (20, 2), after not being below it the day before.
How these numbers were made
We ran the same signal detector MarketSeekho uses to grade players over every trading day of 187 NIFTY 200 stocks, Jan 2021 to Oct 2025, using NSE end-of-day prices (1,54,833 stock-days). We counted the first day a signal appeared, then ignored the same signal on the same stock for 12 trading days so results don’t overlap. Windows with splits, bonuses or trading halts were left out.
“Any day” is the baseline: the same measure after every day in the data, signal or not. It matters because 2021–2025 was mostly a rising market, so stocks were higher after 12 days more often than not anyway. Past results don’t predict future ones, and this is not investment advice.