Put/Call Ratio: How Options Market Sentiment Predicts Market Turns

Understanding the Put/Call Ratio

What is the Put/Call Ratio?

The put/call ratio is calculated by dividing the total volume of put options traded by the total volume of call options traded over a given period, typically one day. It is published by the CBOE and other options exchanges daily. The ratio can be calculated for individual securities, specific indices, or the entire market. When the ratio is above 1, put volume exceeds call volume, signaling bearish sentiment. When it is below 0.7, call volume dominates, signaling bullish sentiment. The ratio is most useful at extreme levels, where it acts as a contrarian indicator — extreme bearish readings (high ratio) often precede market rallies, and extreme bullish readings (low ratio) often precede market declines. This works because options traders tend to be wrong at major turning points, buying puts at the bottom and calls at the top. Compare with the VIX fear index →

Key Put/Call Ratios You Should Follow

There are three main put/call ratios to track. The equity put/call ratio covers options on individual stocks and is the most important for sentiment analysis. Its normal range is 0.4 to 0.7. The index put/call ratio covers options on indexes like SPX and NDX and includes significant institutional hedging activity. Its normal range is 1.0 to 2.0, because institutions buy index puts as portfolio insurance, making it structurally higher. The total put/call ratio includes all options and has a normal range of 0.7 to 1.2. Each ratio provides a different lens on market sentiment, and tracking all three gives a more complete picture. See how the Fear & Greed Index confirms this →

Interpreting Extreme Readings

When the equity put/call ratio drops below 0.45, it signals extreme bullishness and complacency — a warning that the market may be near a top. When it rises above 0.80, it signals extreme bearishness and fear — a contrarian buy signal that the market may be near a bottom. These extremes work because the options market is dominated by retail traders who tend to buy calls during euphoria and buy puts during panic, consistently getting the timing wrong at major turning points. The ISEE (International Securities Exchange) sentiment index provides another perspective: it measures opening long calls versus opening long puts (retail-focused). Below 100 is extreme bearish (buy signal), above 200 is extreme bullish (sell signal).

Limitations of the Put/Call Ratio

The put/call ratio has important limitations. It does not distinguish between opening and closing volume — a trader closing a put position (buying to close) counts the same as one opening a new put. Large institutional hedges, where funds buy index puts as portfolio insurance, can skew the index put/call ratio higher regardless of directional sentiment. The explosion of 0DTE options (zero days to expiration) in recent years has dramatically changed the ratio's behavior, as these short-dated options generate enormous volume unrelated to long-term sentiment. Despite these limitations, the equity put/call ratio remains one of the most reliable sentiment indicators when used at extreme levels. Understand implied volatility and options pricing →

What is a high put/call ratio?

A high put/call ratio means more put options are being traded than call options, signaling bearish sentiment. For the equity put/call ratio, readings above 0.80 are considered high and indicate extreme fear. Historically, these readings have occurred near market bottoms and have been followed by significant rallies. For example, the equity put/call ratio hit 1.2 in March 2020 during the COVID crash, marking one of the best buying opportunities in decades. The index put/call ratio has a higher normal range due to institutional hedging, so readings above 2.0 are considered extreme for that measure.

How is the put/call ratio calculated?

The put/call ratio is calculated by dividing the total volume of put options traded by the total volume of call options traded on a given day. For example, if 10 million puts and 15 million calls trade on the CBOE, the total put/call ratio is 0.67 (10M / 15M). This calculation can be done for individual stocks, stock indexes, or the entire market. The CBOE publishes equity, index, and total put/call ratios daily. Most financial data platforms (Bloomberg, Reuters, Yahoo Finance) provide historical put/call ratio data. The equity ratio is widely considered the most useful for market timing because it reflects retail trading activity without the distortion of institutional index hedging.

Is the put/call ratio a good market timing tool?

At extreme levels, the put/call ratio has a strong track record as a contrarian market timing tool. When the equity put/call ratio exceeds 0.80, the market has historically been near or at a bottom. When it falls below 0.45, the market has often been near a top. However, the ratio is not a precise timing signal — it can remain at extreme levels for days or weeks before the market turns. The best approach is to use the put/call ratio in conjunction with other sentiment indicators like the VIX, the Fear and Greed Index, and market breadth indicators. When multiple indicators flash extreme readings simultaneously, the signal is much more reliable. Check market breadth for confirmation →

What is the difference between equity and index put/call ratios?

The equity put/call ratio tracks options on individual stocks and reflects the sentiment of retail options traders. Its normal range is 0.4 to 0.7, and extremes above 0.80 signal fear while below 0.45 signal complacency. The index put/call ratio tracks options on market indexes like the S&P 500 (SPX) and Nasdaq (NDX). Its normal range is 1.0 to 2.0 because institutions extensively use index puts for portfolio hedging, creating structural put demand. The index ratio tends to be less useful as a pure sentiment gauge because hedging activity dominates. Many analysts prefer the equity put/call ratio for sentiment analysis and the index ratio for understanding institutional hedging flows.

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