In 2026, knowing how gamma exposure (GEX) works and how market makers hedge gamma is a real edge for retail investors, traders and portfolio managers in the SPX options market. S&P 500 options carry over $80 billion gross gamma exposure today, and 0DTE options account for more than 60% of SPX volume. Gamma hedging is now one of the main forces behind intraday and multi-session moves in the index.

Below is how gamma hedging works, how it moves the S&P 500, and what real 2025 and 2026 market data, including gamma squeezes and flow patterns, says about reading gamma exposure and using it in your trading.

What Is Gamma Exposure and Why Does It Matter?

Gamma measures how fast delta changes as the underlying moves. Delta tells you how much an option's price changes for a $1 move in the stock or index. Gamma tells you how much delta itself changes as the price moves.

Gamma exposure (GEX) adds up the gamma of all outstanding option positions, weighted by open interest and contract specs, to estimate how much market makers have to adjust their hedges as the underlying moves.

When market makers sell options, they usually hedge their delta risk by buying or selling the underlying. Because delta keeps changing with price, they have to keep rebalancing. That constant rebalancing is gamma hedging, and the buying and selling it creates can push the underlying around.

The Feedback Loop: How Gamma Hedging Moves the Market

With positive gamma exposure, market makers are net long gamma. As the underlying rises they sell some of it to stay delta neutral, and as it falls they buy. That has a stabilizing effect and adds liquidity to the market.

With negative gamma exposure, market makers are net short gamma. Their hedging flips: they sell into declines and buy into rallies, which makes price moves bigger and raises volatility.

If you know where gamma exposure sits relative to the current SPX price, you can anticipate likely support and resistance zones, volatility spikes and directional moves.

Gamma Exposure in the S&P 500 Options Market: 2025-2026 Data

SPX options volume has exploded, with 11.1 billion contracts cleared in 2023 and continued growth through 2025 and 2026. The rise of 0DTE options, which made up 62.4% of SPX volume as of August 2025, has made gamma effects much stronger.

Key SpotGamma Insights (2026)

A few SpotGamma numbers shape how professionals read gamma exposure:

S&P 500 options carry $80B+ gross gamma exposure, so index moves trigger huge hedging flows.
About 68% of trading sessions close inside SpotGamma's GEX range, which shows how much gamma zones shape SPX price action.
The gamma flip zones, ranges where gamma changes sign, act as key support or resistance. On February 26, 2026, negative gamma building below the SPX price led SpotGamma to raise its risk pivot to 6,900 from 6,800. The S&P 500 then fell 2% and the VIX spiked to 28.

Gamma Exposure Formula Recap

Gamma exposure can be approximated by:

GEX = Option Gamma × Open Interest × Contract Size × Spot Price² × 0.01

This gives you the dollar sensitivity of market makers' hedges to a 1-point move in the SPX.

Market Makers Hedge Gamma: Real 2025-2026 Trade Examples

1. CAR (Avis Budget Group) Gamma Squeeze, April 2026

CAR delivered a textbook gamma squeeze in April 2026. Retail call buying forced market makers to buy the stock aggressively to hedge, and it went from under $100 to nearly $400 in a matter of days.

This happens when heavy call buying piles gamma exposure near or above the current price. Dealer hedging speeds up the move, and the loop keeps going until gamma is "exhausted."

2. Intel (INTC) Gamma Exhaustion Warning, April 2026

The same month, INTC put up nine straight up days, gaining over 60% from a swing low and running toward a $67 trend line. Market makers hit gamma exhaustion, meaning the hedging flows behind the move were fading. That often comes before a pause or a reversal.

3. SPX Gamma Flip: February 26, 2026

On February 26, 2026, SpotGamma flagged negative gamma building below the SPX price and moved its risk pivot to 6,900 from 6,800. That shift was followed by a 2% drop in SPX and a VIX spike to 28. Gamma positioning gave an early warning on both volatility and direction.

Interpreting Gamma Exposure to Gain a Professional Edge

Why Most Retail Traders Miss the Mark

A 2025 LSEG study found real-time institutional flow signals achieve 65.5% directional accuracy, rising to 71.1% for high-confidence signals, while retail flow signals are close to random at 48.8% accuracy. That gap is why professionals who understand gamma exposure and dealer hedging have an edge.

How to Use Gamma Exposure in Your Trading

Track GEX ranges and gamma flip zones with a data provider like SpotGamma. These zones often line up with SPX support and resistance.
Watch 0DTE volume. With 0DTE options above 60% of SPX volume, short-term gamma hedging is extreme, and a sudden shift in 0DTE flow can cause outsized intraday moves.
Look for gamma squeezes. Large call sweeps with high volume-to-open interest ratios (Vol/OI) are the tell. The $12.9M TSLA call sweep in December 2025 on $550 calls came before sustained upward pressure.
Expect gamma exhaustion after long rallies or declines driven by gamma hedging, as in the INTC example from April 2026.

The Impact of Gamma on Volatility: VIX and GEX Correlation

Gamma exposure moves inversely with volatility. When net gamma is positive, dealer hedging dampens volatility and the VIX tends to drift lower. When gamma is negative, volatility rises and the VIX spikes.

Early 2026 showed this clearly. When SPX gamma flipped below key levels in January 2026, net gamma turned lower and volatility picked up. The VIX spike to 28 in February after negative gamma built up showed the same thing.

Real Options Flow Examples Illustrating Gamma Hedging Impact

Google (GOOGL) Institutional Call Buying, January 26, 2026

GOOGL saw heavy institutional call buying, including a $3.43 million purchase of June 2026 $340 calls and a net bullish delta imbalance of +162,191. That flow likely forced market makers to buy shares, which helped GOOGL's 6.4% YTD gain.

Nvidia (NVDA) Vol/OI Spike Before Earnings, May 2026

Ahead of NVIDIA's May 2026 earnings, calls traded at a premium to puts, a sign of positive skew and bullish sentiment. Implied volatility has historically collapsed after earnings (from ~60% to ~30%), and traders still positioned aggressively, which set off gamma hedging flows that moved NVDA's price.

Pairing Gamma Exposure With Unusual Options Activity Alerts

To trade around gamma, you need timely options flow data. Optionsbell.com sends email alerts for unusual options activity for $24.99/month, including multi-million-dollar sweeps and blocks. Watching that flow helps you anticipate market maker hedging and get positioned before the gamma-driven move.

Summary: Why Gamma Exposure Should Be a Core Indicator in 2026

Market makers hedge gamma by buying and selling the underlying as delta changes, which can either amplify or steady SPX moves.
With $80B+ gross gamma exposure and 0DTE options dominating volume, gamma hedging now shapes day-to-day S&P 500 volatility and price levels.
The CAR gamma squeeze and INTC gamma exhaustion show what gamma hedging does to price action in practice.
Gamma exposure zones, 0DTE flow and unusual options activity, watched together, give you a measurable edge.
The inverse link between gamma exposure and the VIX helps you see regime changes coming.

Before your next SPX trade, check where net gamma sits relative to the flip zone. Above it, expect dealers to lean against the move. Below it, expect them to chase it.

References

SpotGamma Research Data, 2025-2026
Cboe 0DTE Volume Report (Aug 2025)
LSEG Study (2025)
TradeAlgo Study (2026)
Linköping University Thesis (June 2025)
Buis et al., JFE (2024)
VerifiedInvesting (April 2026 CAR Gamma Squeeze)
CheddarFlow (TSLA Dec 2025 Sweeps)
UnusualWhales (GOOGL Jan 2026 Calls, NVDA May 2026 Earnings Flow)
CNBC (NVDA Earnings IV)
TradesViz Instagram (May 2026 Semiconductor Flow)

Get unusual options activity alerts at Optionsbell.com for $24.99/month.