S&P 500 Stock Market Gamma Trading Levels Based on Options Open Interest
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SPX Gamma Exposure (GEX) measures the aggregate gamma positioning of options dealers in the S&P 500 (SPX). It estimates how market makers must hedge as price moves, which can create either stabilizing or amplifying flows in the underlying index.
When SPX Gamma Exposure is positive, dealers are typically long gamma and hedge by selling into strength and buying into weakness — this can dampen volatility and support range-bound trading. When SPX Gamma Exposure is negative, dealers are short gamma and hedge by buying strength and selling weakness — which can accelerate moves and increase volatility.
Quick Answer: SPX gamma exposure (GEX) estimates the aggregate gamma held by S&P 500 options dealers. Positive GEX can stabilize the index because dealers tend to sell rallies and buy dips. Negative GEX can amplify moves. It is a volatility-regime map, not a forecast of direction.
Last updated: August 17, 2026. Reviewed by SpotGamma research. This public chart uses a standard net-gamma convention (liquidity providers typically short puts and long calls). Full methodology, limitations, and worked examples are on the Gamma Exposure (GEX) pillar.
This is a standard net gamma curve, using basic assumptions that options liquidity providers are short put options and long calls. In particular it can be used as a map which allows traders to quickly estimate where large put and call positions are located in the market.
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Standard gamma curves are based on a set of simple assumptions intended to describe how options dealers are positioned in the market. The size of these positions have been statistically linked to future or forward volatility.
These curves are a small fraction of what SpotGamma monitors to gain an understanding of the options impact on stocks.
1. What does positive SPX GEX mean?
Positive SPX GEX suggests dealers are long gamma and likely to hedge in ways that reduce volatility.
2. What does negative SPX GEX mean?
Negative SPX GEX indicates dealers are short gamma and may hedge in ways that amplify market moves.
3. Why does SPX GEX affect volatility?
Dealer hedging activity can create systematic buy/sell pressure as price moves, influencing short-term volatility.
4. Is SPX GEX predictive?
GEX is not a guarantee of direction, but it provides context for how price may behave in different volatility regimes.
5. How often is SPX GEX updated?
The SPX Gamma Exposure chart is updated daily using current options positioning data.
6. What is the difference between SPX GEX and SPY GEX?
SPX GEX is based on index options, while SPY GEX reflects ETF options positioning. Liquidity and contract structure differ.
7. Can GEX flip during the day?
Yes. Large price moves or expiration-related positioning changes can cause gamma exposure to shift.
The curve plots estimated net dealer gamma across SPX price levels. Three features do most of the work:
For today’s exact strikes — Call Wall, Put Wall, and Zero Gamma — see SPX GEX levels today, updated every trading morning before the open.
A common daily workflow is to check the gamma regime before the open. In a positive gamma regime, intraday moves tend to mean-revert, so traders often fade pushes toward the Call Wall and buy dips near the Put Wall. In a negative gamma regime, moves tend to extend rather than revert — breakouts carry further, and risk management matters more than entry precision. The regime also frames options strategies: positive gamma environments favor premium selling and range trades, while negative gamma favors long volatility and momentum structures.
Remember that this public curve weights every open contract the same. For positioning-aware levels on SPX and 3,500+ single stocks — built from analysis of actual order flow rather than raw open interest — see Equity Hub. The full mechanics are covered in the Gamma Exposure (GEX) guide, and the trading playbook in how to trade gamma exposure.
While this curve uses simplified positioning assumptions, it can offer some limited, but key insights. Monitoring the daily changes to this curve can offer insights into how traders are adjusting their options positions.
For improved forecasting power, SpotGamma subscribers have access to the SpotGamma Implied Volatility (SIV) Index, an improved method to forecast market volatility. This metric is derived from studies into the interaction between measurements of S&P 500 Gamma, changes in implied volatility and movement in the S&P 500.
For more efficient market forecasts, improved volatility estimates, and highly-actionable trading intelligence, subscribe now.
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