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Mean Reversion: Trading Back to the Average

By Sven PflügerPublished: 2026-04-0111 min read time

What is Mean Reversion?

Mean reversion is a trading strategy based on the tendency of prices to return to their average after extreme movements. If an instrument deviates too far upward, it will likely correct. If too far downward, it will likely rise.

This strategy pairs perfectly with sentiment data — because extreme positioning IS an extreme deviation from the normal state.

Measuring "Too Far"

Bollinger Bands

20 SMA +/- 2 standard deviations. Price touching the upper band = statistically "overbought." Lower band = "oversold."

RSI

Measures whether an instrument is overbought (>70) or oversold (<30) relative to its own recent price movements. RSI extremes often correlate with sentiment extremes.

Sentiment as Mean Reversion Indicator

Each instrument has a "normal" positioning range on Sentmo (e.g., US30: 55-62% long). When positioning deviates significantly, the probability of reversion increases.

The Process

  • Determine normal values by observing positioning over 2-4 weeks
  • Identify significant deviations (e.g., US30 at 78% long vs. normal 55-62%)
  • Seek technical confirmation (Bollinger Band touch, RSI extreme, S/R level)
  • Entry on reversal candle, stop beyond the extreme, target at the 20 SMA
  • When Mean Reversion Fails

    In strong trends, instruments can stay "overbought" for months. Use ADX as filter: ADX > 25 = trending market (avoid mean reversion). ADX < 20 = ranging market (ideal). News-driven moves create new equilibriums where the old average is irrelevant.

    The Triple Confirmation Setup

    Price at Bollinger Band extreme + RSI above 70 or below 30 + Sentiment extreme on Sentmo (>70% on one side). This triple confirmation produces the highest-probability mean reversion trades.