Put-Call Ratio
A sentiment indicator comparing put volume to call volume across the market.
The put-call ratio divides the total number of put options traded by the total number of call options traded over a given period. A ratio above 1.0 means more puts are being traded than calls, suggesting bearish sentiment. A ratio below 1.0 means more calls are being traded, suggesting bullish sentiment. The ratio is typically measured for the entire market (equity put-call ratio) or for a specific stock or index.
Why It Matters
The put-call ratio is one of the most widely followed contrarian sentiment indicators. When everyone is buying puts and the ratio spikes above 1.0, the crowd is fearful — and contrarian logic says this is often a good time to buy. When everyone is buying calls and the ratio drops below 0.60, optimism is extreme — and the market may be due for a correction.
Options traders use this data to calibrate their own positioning. If the put-call ratio says the crowd is extremely bearish, selling puts (a bullish strategy) has a statistical edge because the extreme pessimism has likely already pushed prices lower than warranted. If the ratio shows extreme bullishness, selling calls or buying protective puts makes more sense.
How It Works
Reading the ratio:
- Equity put-call ratio above 0.90-1.0: Elevated fear. More traders are buying downside protection than betting on upside. Contrarian bullish signal.
- Equity put-call ratio below 0.60: Elevated complacency. Traders are heavily positioned for upside. Contrarian bearish signal.
- Ratio near 0.70-0.80: Neutral range. No extreme signal in either direction.
Types of put-call ratios:
- CBOE Equity put-call ratio: Measures all individual stock options. Most commonly referenced.
- CBOE Index put-call ratio: Measures index options (SPX, etc.). Tends to be higher because institutions use index puts for hedging.
- Total put-call ratio: Combines equity and index. Less useful for sentiment readings because institutional hedging skews it.
- Single-stock put-call ratio: Useful for gauging sentiment on a specific name before earnings or events.
Using it effectively:
- Look at a 5-day or 10-day moving average to smooth daily noise.
- Extreme readings are more meaningful than day-to-day fluctuations.
- Combine with other sentiment tools like the VIX and market breadth for confirmation.
- The ratio works best as a contrarian tool at extremes, not as a directional indicator in the middle range.
Limitations: Institutional hedging activity can inflate the put-call ratio without reflecting genuine bearish sentiment. A pension fund buying puts for portfolio protection is not the same as retail traders panic-buying puts. The equity-only ratio filters out some of this noise.
Quick Example
After a two-week market selloff, the 10-day equity put-call ratio reaches 0.95 — the highest reading in six months. You interpret this as peak fear and sell put spreads on SPY, collecting elevated premium. Over the next week, the market stabilizes and bounces. The put-call ratio drops back to 0.75, premiums deflate, and your spreads profit from both the direction and the volatility contraction.