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.