What is the put-call ratio?

The put-call ratio is a sentiment indicator that divides the total volume of put options traded by the total volume of call options traded on a given day. Put options give the holder the right to sell at a specified price (bearish positioning), while call options give the right to buy (bullish positioning). The ratio provides a read on whether options traders are positioned defensively or aggressively.

The CBOE Total Put-Call Ratio typically ranges between 0.70 and 1.10. A reading below 0.70 indicates heavy call buying and bullish sentiment, which contrarian investors interpret as a warning signal of potential complacency. A reading above 1.00 indicates more puts than calls are being traded, signaling heightened fear, which contrarians view as a potential buying opportunity.

The contrarian interpretation of the put-call ratio is based on the observation that retail options traders tend to be wrong at extremes. When everyone is buying puts (extreme fear), much of the selling pressure may already be exhausted, setting the stage for a rally. When everyone is buying calls (extreme greed), the buying fuel is running low and the market is vulnerable to a pullback.

For best results, the put-call ratio should be smoothed using a 5-day or 10-day moving average rather than interpreted from single-day readings, which can be noisy. It is also most useful when combined with other sentiment indicators like the VIX, the AAII sentiment survey, CNN Fear & Greed Index, and fund flow data to build a composite picture of market positioning.

Options markets have changed significantly with the rise of short-dated (0DTE) options trading, which now represents a substantial share of total volume. This structural shift has affected the baseline behavior of the put-call ratio and requires adjusting historical comparisons. Despite this evolution, the ratio remains a valuable tool for gauging whether market sentiment has reached an extreme that might precede a reversal.