To The Moon

GEX (Gamma Exposure) is a core metric that measures market makers' risk exposure and potential institutional fund flows, accurately reflecting the invisible "push and pull" forces of the market at different price levels.

I. What is GEX?

Gamma Exposure (Gamma Exposure) is a key indicator viewed from the perspective of the overall market and market makers to measure market makers' risk exposure and potential market fund flows. To truly understand this function, we first need to look at the primary force in the market: Market Makers.

1. What is a Market Maker?

Market makers are the middlemen of the market, commonly known as "house makers" (or liquidity providers), and their main mission is to provide market liquidity:

• Whenever you want to buy, they must sell to you;

• Whenever you want to sell, they must buy from you, making a profit through bid-ask spreads.

2. Why Do Market Makers Need Hedging? — Delta Neutrality

Acting as the counterparty to earn the bid-ask spread is a lucrative business, but what market makers fear most is holding too many one-sided positions—namely, a massive "Gamma Exposure."

• Example: If mainstream investors in the market widely expect a certain tech giant's stock to rise and buy a large number of Calls (Call options) from market makers, the market makers will end up holding massive short Call positions. If the stock price eventually surges past the strike price, market makers are forced to sell at the lower strike price, suffering heavy one-sided losses.

• Solution: To lock in risk, market makers must buy a corresponding number of shares in the spot market to hedge, so that the gains from rising stock prices offset the losses from the short option positions. This maintaining of a risk-neutral state is called "Delta Neutrality."

3. How Do Market Makers' Hedging Actions Affect Prices?

Because market makers control substantial capital and volume, their hedging actions (buying or selling the underlying stock) create systemic support and resistance near key price levels, thereby influencing short-term price fluctuations and market rhythms:

• Selling to Hedge $\rightarrow$ Creates Resistance (Suppresses upward movement)

• Buying to Hedge $\rightarrow$ Creates Support (Props up downward movement)

II. How is GEX Calculated?

GEX = Gamma × Open Interest × Contract Multiplier × Spot Price² × 0.01
Where each metric represents:

• Open Interest (OI): The number of unclosed option contracts.

• Contract Multiplier: Typically 100 for U.S. stock options.

III. How to Read GEX Charts?

GEX charts display the distribution of market Gamma exposure across different price levels.

• Positive Gamma (Price > Zero Gamma): The market is in a positive Gamma zone where price fluctuations are generally more stable, and the market tends toward range-bound oscillations. Focus on support and pressure near key strike prices.

• Negative Gamma (Price < Zero Gamma): The market is in a negative Gamma zone where price volatility may amplify, and the market is more prone to trend movements. Pay attention to position management and risk control.

Core Region Characteristics Comparison

IV. How to Use GEX for Trading Decisions?

1. Core Idea: GEX is the Compass of "Market Microstructure"

• Price in Positive Gamma Region ：Volatility tends to decrease. The market is more likely to range-bound and mean-revert.

  • Strategy Reference: Short-term range strategies (selling straddles/strangles, or buying volatility and taking profits near boundaries).

• Price in Negative Gamma Region ：Volatility tends to increase. Trends are likely to continue after breakouts.

  • Strategy Reference: Trend following (breakout following, trend strategies, buying volatility such as Long Straddle).

• Price Near Zero GEX ：High uncertainty. Bull and bear forces are balanced, and a directional choice is approaching.

  • Strategy Reference: Wait for confirmation signals (observe base positions, IV changes, and key price level breakouts).

2. Practical Application Scenarios

• Evaluating Support/Resistance Effectiveness: Positive GEX regions often act as "invisible support/resistance," making prices harder to break through easily.

• Predicting Volatility Changes: Negative GEX regions are usually accompanied by rising IV; positive GEX regions tend to see declining IV.

• Option Strategy Selection: Combine GEX distribution to select optimal option strategies and expiration dates to improve win rates.

• Risk Management: When prices approach significant GEX boundaries, pay close attention to position risk and stop-loss placements.

Risk Warning: The content of this article is for investor education and market popularization purposes only and does not constitute any specific investment advice, trading basis, or financial services. Option trading belongs to high-risk, high-leverage financial derivative investments. Market conditions change rapidly, and the GEX (Gamma Exposure) indicator also possesses lagging characteristics or model limitations. Investors should make comprehensive judgments based on their own risk tolerance, financial status, and macroeconomic fundamentals when making actual trading decisions, strictly manage positions and control risks, and independently bear corresponding investment risks.