What put/call ratio measures
The put/call ratio divides the number of put options traded by the number of call options traded over a given period. A ratio above 1.0 means more puts than calls are being bought, investors are paying for downside protection or speculating on a decline. A ratio below 0.7 means calls are heavily dominant, investors are bullish or speculating on upside.
Like VIX, the put/call ratio is a mean-reverting sentiment indicator and is most useful at extremes. Extreme put buying (ratio above 1.2-1.3 on equity-only options) indicates elevated fear and is historically associated with market bottoms. Extreme call buying (ratio below 0.6) indicates complacency and is associated with short-term tops.
The equity-only put/call ratio (excluding index options, which are heavily used by professionals for hedging) is considered cleaner for retail sentiment. Index options have large institutional hedging demand that distorts the ratio; equity-only better isolates retail positioning.
The CBOE publishes put/call ratio data daily. Watch the 5-day and 21-day moving averages rather than single-day readings, which can be noisy. A sustained period of put/call moving averages above 1.1 often signals that significant downside fear is already priced in.
Options flow and dark pools
Beyond the aggregate put/call ratio, specific options flow data (large unusual options activity) can signal informed positioning. When a single entity buys a very large block of puts or calls far out-of-the-money with unusual urgency, it sometimes precedes a significant move.
Platforms that track unusual options activity (UOA) flag these events. The challenge: distinguishing genuine directional bets from hedges, earnings plays, and complex multi-leg strategies. A naked out-of-the-money call purchase looks different from a covered call, both show as "call buying" in aggregate data.
Dealer gamma positioning is more sophisticated, tracking where options market makers are net long or short gamma, and how they must hedge their books as price moves. When dealers are net short gamma near a key price level, their hedging activity (buying the dip or selling the rally to delta-hedge) can amplify moves. When they're long gamma, their hedging acts as a stabilizer.
Sentiment surveys
The AAII Investor Sentiment Survey polls individual investors weekly about whether they're bullish, bearish, or neutral on the market for the next 6 months. With decades of data, its extremes are reliable contrarian signals. When bearish sentiment exceeds 50% in the AAII survey, forward 12-month returns have historically been well above average.
The Investors Intelligence survey polls newsletter writers rather than individuals, a proxy for financial media sentiment. When bulls exceed 60% of respondents or bears fall below 20%, the reading is considered frothy. When bears exceed 45%, the reading is contrarian bullish.
No single sentiment survey should drive a trade. But when multiple surveys simultaneously reach historical extremes in the same direction, and options data (VIX, put/call) confirms, the setup has historical backing for a mean-reversion trade.