Options Gamma Exposure (GEX)

Overview

This pillar analyzes the net options gamma exposure of market makers to identify price levels that attract or repel asset prices. It provides a unique view into market structure and potential volatility shifts.

What It Does

It aggregates the gamma value of all outstanding call and put options for a specific asset, like the S&P 500. This calculation reveals the total hedging exposure of market makers. The pillar then identifies key thresholds, such as the 'Zero Gamma' level, where hedging behavior is expected to change dramatically.

Why It Matters

Gamma exposure creates powerful feedback loops in the market. This pillar's analysis helps predict whether volatility will be suppressed, with prices pinned to a certain level, or amplified, leading to sharp, accelerated moves.

How It Works

First, the pillar collects open interest data for all options contracts on a given asset. It then calculates the gamma for each contract and multiplies it by the open interest. Finally, it sums these values to determine the net gamma exposure at various price points, highlighting the levels with the most significant hedging implications.

Methodology

Net Gamma Exposure is calculated by summing the gamma of all call options and subtracting the gamma of all put options across all strike prices, weighted by open interest. The formula per strike is: (Call Open Interest * Call Gamma) - (Put Open Interest * Put Gamma). The Zero Gamma level is the underlying price at which this net sum equals zero, representing the inflection point for dealer hedging.

Edge & Advantage

This analysis provides a view of forced buying and selling pressure from market makers, an influence often invisible to traders using standard technical or fundamental analysis.

Key Indicators

• Zero Gamma Level

  high

  The asset price where market maker hedging flips from suppressing volatility (positive GEX) to amplifying it (negative GEX).

• Call & Put Walls

  high

  Strike prices with the highest concentration of gamma, acting as powerful price magnets or resistance/support levels.

• Net GEX Value

  medium

  The total dollar value of gamma exposure per 1% move in the underlying asset, indicating the overall stability of the market.

Data Sources

• CBOE (Chicago Board Options Exchange)

  Provides the raw options open interest, volume, and pricing data needed for the core calculation.

• Specialized Data Providers

  Services like SpotGamma or SqueezeMetrics that aggregate and process options data to provide calculated GEX levels.

Example Questions This Pillar Answers

• → Will the S&P 500 close between 4500 and 4550 this week?
• → Will Bitcoin's realized volatility be over 5% in the next 24 hours?
• → Will Tesla stock touch $200 before its monthly options expiration date?

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