Bollinger Band Buy Scanner

Bollinger Bands are a volatility envelope built around a simple moving average (usually 20-day). The bands expand and contract with realized volatility. A touch of the lower band means price has moved roughly two standard deviations below its 20-day average — but it does not, by itself, mean the stock is a buy. It simply means the price move has been unusually weak in the recent window. Context — trend, volume, fundamentals, and broader market structure — decides whether the touch is a reversal signal or the start of a deeper decline.

• Upper band: overbought in the context of recent volatility; not a sell signal alone.
• Middle band (20-DMA): a short-term trend reference. Reclaiming it after a lower-band touch is early evidence of stabilization.
• Lower band: oversold in the recent window; requires confirmation before treating as a buy setup.
• Band width: narrowing bands often precede volatility expansion — but direction is not predicted by width alone.

A lower-band touch is one of the most misused signals in technical analysis. Many stocks bounce briefly after touching the lower band, then resume a downtrend. The false signals share common traits:

• Broken trend: the stock is below a declining 50-DMA and 200-DMA; the band touch is simply catching a falling knife.
• Volume collapse: the bounce happens on below-average volume — no real demand stepping in.
• Sector-wide liquidation: the entire group is selling off (e.g., rate-sensitive REITs in a rising-rate environment); stock-specific support is unreliable.
• Earnings deterioration: fundamentals are weakening alongside price; the band touch reflects real repricing, not a temporary dislocation.

RSI (Relative Strength Index) measures the magnitude of recent price changes to evaluate overbought or oversold conditions. In the Bollinger scanner, we look for RSI under 35 at or near the lower-band touch. This combination means the stock has not only sold off in price but has done so with persistent downward momentum — creating a compressed condition where a reversal is more probable than continuation. RSI alone is not enough: a stock can have an RSI of 25 and keep falling for weeks in a strong downtrend. RSI works best when paired with a reclaim of the 20-DMA and volume expansion.

Volume is the footprint of conviction. A lower-band touch on heavy volume may indicate panic selling and capitulation — a potential bottom. A lower-band touch followed by a reclaim of the middle band on above-average volume suggests institutional accumulation. Conversely, a band touch on declining volume suggests indifference, not exhaustion. The scanner flags volume context so you can distinguish a meaningful test of support from a thin, unreliable drift.

• Capitulation volume: a large spike as the lower band is touched; often marks a local bottom.
• Reclaim volume: above-average volume on the day price closes back inside the bands or above the 20-DMA.
• Declining volume: lower-band touch with falling volume; more likely continuation than reversal.

Moving averages define trend. In the scanner, we check where price sits relative to the 20-DMA, 50-DMA, and 200-DMA. The strongest Bollinger setups occur when the lower-band touch happens while the stock remains above its 50-DMA and 200-DMA — in other words, a short-term pullback within a medium-to-long-term uptrend. When a stock is below its 50-DMA and 200-DMA, the lower-band touch is more likely a continuation of a downtrend than a reversal.

• Above 50-DMA & 200-DMA: higher-probability pullback within an uptrend.
• Below 50-DMA, above 200-DMA: intermediate weakness; requires stronger confirmation.
• Below 200-DMA: long-term trend is down; lower-band signals are low-probability unless a major base is forming.