Investor Sentiment Is a Contrarian Indicator
Bullish sentiment vs. forward 12-month S&P 500 returns
When consumer sentiment (University of Michigan) or AAII bullish sentiment is extremely high, forward returns tend to be below average. When bearish sentiment dominates, forward returns tend to be above average. The crowd is reliably wrong at extremes.
What history says
Editorial commentary written by ALAN analysts. Figures cited below are analyst-authored context — they are not derived from the chart above and may reflect different windows or sources.
When AAII bullish sentiment exceeds 50% (top decile), median forward 12-month returns are approximately +5% vs. +10.5% unconditional. Euphoria compresses future returns.
When AAII bearish sentiment exceeds 50% (extreme fear), median forward 12-month returns exceed +18%. Maximum pessimism = maximum opportunity.
Extreme sentiment can persist for months before resolving. Use it to calibrate expected returns and risk, not to make binary buy/sell decisions.
Use sentiment extremes to recalibrate expectations rather than allocations: when bullishness is everywhere, plan around leaner forward returns and resist adding risk, and when pessimism dominates, let your rebalancing rules — which will be buying — operate without interference.