Ticker&TapeBollinger Bands and Keltner Channels
Bollinger Bands and Keltner Channels draw an envelope around price. When the envelope gets narrow, the stock has gone quiet, and quiet often comes right before a big move.
What the bands are
Bollinger Bands start with a 20-day simple moving average. An upper band is drawn two standard deviations above it and a lower band two standard deviations below. Standard deviation is a measure of how widely prices have been swinging. When a stock moves wildly, the bands spread apart. When it calms down, they pinch together.
Keltner Channels look similar but are built differently. They use an exponential moving average, usually 20 days, with bands set a multiple of the average true range above and below. Because ATR changes more slowly, Keltner Channels are smoother.
The squeeze
The most useful idea here is the squeeze. When the Bollinger Bands get unusually narrow, volatility has dried up. Many traders define a squeeze as the Bollinger Bands moving inside the Keltner Channels.
This matches what O'Neil-style traders look for in a base: tight weekly closes and volume drying up near the lows of a handle or a flat base. Sellers have run out. When buyers return, the move out of that quiet zone can be fast.
- A squeeze tells you a move is likely, not which direction.
- Let the base and the pivot tell you where to act.
- Confirm the breakout with volume well above average.
Riding the band
Beginners often think a stock touching the upper band is too high and must come back. In a strong uptrend, the opposite happens: price can ride the upper band for days or weeks, closing near it again and again. That is a sign of persistent demand.
The same works in reverse. A stock that keeps hugging the lower band is in steady decline. Buying it just because it touched the lower band is trying to catch a falling knife.
How traders use them
Use the bands as context. A narrow band during a base supports the idea that the base is tight. A stock that ran far above the upper band in a few days may be stretched, so new buyers can wait for a calmer entry instead of chasing. A close back inside the bands after a long ride can be an early hint that the run is cooling.
On the platform, add Bollinger Bands or Keltner Channels as overlays from the Indicators button, or both at once to spot squeezes.
Common mistakes
- Selling a strong stock just because it touched the upper band.
- Buying a weak stock because it touched the lower band.
- Treating a squeeze as a direction signal instead of a volatility signal.
- Ignoring volume when price breaks out of a squeeze.
Key points
- Bollinger Bands widen and narrow with volatility; Keltner Channels do the same more smoothly using ATR.
- A squeeze means the stock has gone quiet, which often comes before a big move.
- Strong stocks can ride the upper band; that is strength, not a sell signal.
Check what you learned
Answer at least 2 of 3 correctly to complete the lesson.
1. What does a squeeze tell you?
A squeeze means volatility has dried up. Let the base and the pivot tell you where to act, and confirm the breakout with volume.
2. In a strong uptrend, a stock closes near its upper Bollinger Band day after day. What does that mean?
Strong stocks can ride the upper band for days or weeks. That is strength, not a sell signal.
3. How are Keltner Channels built differently from Bollinger Bands?
Bollinger Bands use a 20-day SMA and standard deviation. Keltner Channels use an EMA and the average true range, which changes more slowly.
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