Put/Call Ratio Regime Filter

Overview

This pillar analyzes the Put/Call Ratio, a classic sentiment indicator, by contextualizing it against its historical range. It helps identify periods of extreme fear or greed, which often precede significant market reversals.

What It Does

The pillar calculates the percentile rank of the current Put/Call Ratio (PCR) over a defined lookback period, typically one year. Instead of just looking at the raw ratio, it determines if current sentiment is in an extreme zone, like the top 5% (extreme fear) or bottom 5% (extreme greed), compared to recent history. This transforms a noisy indicator into a clearer signal for contrarian analysis.

Why It Matters

Markets often reverse when sentiment reaches a one-sided extreme. This pillar provides a data-driven way to spot these potential turning points, offering an edge by signaling when to bet against the prevailing crowd consensus before the trend shifts.

How It Works

First, it ingests daily put and call option volume data for a specific index, like the S&P 500. It then calculates the raw Put/Call Ratio by dividing total put volume by total call volume. Finally, this ratio is compared against all daily ratios from the past year to determine its historical percentile, flagging values above 95% or below 5% as significant.

Methodology

The core calculation is (Total Put Volume / Total Call Volume). This raw ratio is then ranked against a rolling 252-day (1-year) lookback period to generate a percentile. A signal is triggered when the percentile crosses an extreme threshold, typically defined as <5% (extreme bullishness, a bearish contrarian signal) or >95% (extreme bearishness, a bullish contrarian signal). Analysis can also be done on Open Interest instead of volume.

Edge & Advantage

It filters out the noise of day-to-day PCR fluctuations and provides a statistically relevant signal for when market sentiment has reached a breaking point, creating high-probability contrarian trading opportunities.

Key Indicators

• PCR Percentile (1yr)

  high

  The current Put/Call ratio's rank compared to the last 252 trading days. Values >95% or <5% are most significant.

• Equity vs Index PCR Spread

  medium

  The difference between PCR for individual stocks and the broad market index, indicating if 'smart money' and 'retail' sentiment diverge.

• Contrarian Signal Strength

  high

  A score indicating how far the percentile is beyond the threshold; a 99th percentile reading is a stronger signal than a 95th.

Data Sources

• CBOE

  The Chicago Board Options Exchange provides official daily put and call volume data for major US indices.

• Financial Data APIs

  Services like Polygon.io or Intrinio that provide aggregated historical options data for deeper analysis.

Example Questions This Pillar Answers

• → Will the S&P 500 close higher 30 days from now?
• → Will the VIX index be above 25 on its next expiration date?
• → Will the Nasdaq 100 index experience a correction of 5% or more in the next quarter?

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