Introduction

Retail and institutional investors often have divergent sentiments: retail chasing momentum while institutions fade it, or vice versa. Tracking sentiment divergence—differences in bullishness/bearishness between retail and institutional sources—predicts mean reversion. When retail is extremely bullish while institutions are bearish, expect retail-driven rallies to reverse.

Sentiment Source Separation

Retail sentiment: social media, retail brokerage flow, options activity (retail concentrated). Institutional sentiment: block trades, 13F holdings, large fund flows, sell-side research positioning. Measure each separately, compute divergence. High divergence predicts reversions toward consensus.

Trading Application

When retail is extremely bullish (percentile > 90%) but institutions bearish, short the stock or buy puts; expect retail momentum to reverse. Backtest profitability on 2020–2024 meme stock episodes confirms strategy.

Conclusion

Detecting sentiment divergence between retail and institutions enables exploitation of crowded retail trades.