Put/call Ratio

What is the Put/call Ratio?

The put/call ratio divides the volume of put options traded by the volume of call options traded over a session, either for a single underlying or aggregated across a whole market. Readings above 1 mean more puts changed hands than calls. It is a sentiment gauge with a contrarian reading: heavy put activity is taken as fear or hedging demand, heavy call activity as speculative appetite, and extremes in either direction are watched as signs the crowd's positioning may already be spent.

The aggregate versions differ meaningfully. The equity-only ratio (single-stock options) is the preferred sentiment read because it is dominated by directional speculation and usually sits below 1. The index ratio runs persistently higher because institutions buy index puts as portfolio insurance, so its level reflects hedging more than opinion. The total ratio mixes both. Raw daily values are noisy and thresholds drift as market structure evolves, so practitioners smooth the series and compare it with its own recent distribution rather than fixed levels.

How traders use it

• As a contrarian extreme detector: smoothed equity-only readings in the upper tail of their rolling range, defined by percentile rank or a similar normalization, flag broad fear that has sometimes coincided with tradable lows, while unusually low readings flag complacency. Extremes can extend, so most frameworks wait for price confirmation.
• As confirmation alongside other options-derived gauges: a put/call extreme carries more weight when implied volatility and the VIX are telling the same story about fear or complacency.
• With open interest instead of volume: OI-based ratios update slowly and read as accumulated positioning rather than daily flow, which some traders use as context around expirations.