Gamma exposure (GEX) is one of the most useful and least appreciated indicators for options traders, portfolio managers and retail investors. Through 2025 and 2026, the zero gamma level, the price where net gamma exposure flips from positive to negative, has worked as the most important line of support or resistance for the S&P 500 and other major indices.

This article explains the zero gamma level (zero GEX), why it matters now, and how to use it in your trading, with real 2025-2026 data and trade examples.

What is Gamma Exposure (GEX) and Why Does It Matter?

Gamma exposure measures how market makers and liquidity providers have to hedge their option positions as the underlying price moves. In positive gamma, dealer hedging works against the move: they sell into strength and buy into weakness, which supports the market and keeps volatility down. In negative gamma, it works with the move: dealers sell into weakness and buy into strength, which makes price swings bigger and pushes volatility up.

SpotGamma estimates more than $80 billion in gross gamma exposure on S&P 500 index options alone in 2025 and 2026. With that much gamma in the market, 68% of trading sessions close inside SpotGamma's GEX range, the band between the key positive and negative gamma levels that act as support and resistance.

The zero gamma level, or zero GEX, is the price where net gamma exposure goes from positive to negative. It marks the line between a market held steady by dealer hedging (positive gamma) and a market open to amplified volatility (negative gamma).

The Zero Gamma Level as the Most Important Support and Resistance Line

Classic support and resistance lines come from past price action or volume clusters. The zero gamma level is a dynamic, quantitatively derived support/resistance line based on current options positioning and dealer hedging flows.

Why Zero Gamma Matters More Than Traditional Lines

Three reasons. First, dealers hedge their delta continuously based on gamma exposure. Above the zero gamma level, that hedging cushions moves and creates support. Below it, hedging adds to the selling and rallies run into resistance.

Second, the research backs it. A Linköping University study (June 2025) found that S&P 500 gamma exposure predicts future market volatility better than traditional indicators.

Third, the VIX tends to spike when SPX crosses below zero gamma. On February 26, 2026, SpotGamma raised the SPX risk pivot from 6,800 to 6,900 because negative gamma was building beneath the price. The S&P 500 then dropped 2% and the VIX jumped to 28.

Real-World Examples: Zero Gamma Level in Action (2025-2026)

1. SPX Gamma Flip in Early 2026: January & February

On January 23, 2026, SPX net gamma exposure sat just below a key level (SpotGamma data). The market couldn't break cleanly above that zero gamma pivot despite strong fundamentals. When it eventually broke below, volatility picked up and the market became more fragile.

On February 26, 2026, SpotGamma raised the SPX risk pivot to 6,900 from 6,800, pointing to heavy negative gamma below the index. The market fell 2% and the VIX spiked to 28.

2. CAR Gamma Squeeze: April 2026

The Avis Budget Group (CAR) gamma squeeze in April 2026 is a textbook case of gamma driving price. The stock went from under $100 to nearly $400 in a few weeks. Heavy retail call buying forced market makers to hedge by buying the stock, and their buying pushed it higher still.

Gamma exposure analysis showed massive gamma accumulation above the zero gamma level. For CAR, the zero gamma level became the floor while dealers kept buying into strength and fueling the squeeze.

3. Intel (INTC) Gamma Exhaustion: April 2026

Intel showed the opposite in April 2026: gamma exhaustion. The stock rose 9 days in a row, a 60% rally from its swing low. As it approached the $67 trend line, gamma data suggested dealers were running out of hedging capacity, a warning that a pullback was close.

That exhaustion near the zero gamma boundary shows how gamma levels can flag critical inflection points before price reverses.

Quantifying Zero Gamma: How is the Zero Gamma Level Calculated?

You get the zero gamma level by adding up the gamma of every option, weighted by open interest, contract size and spot price squared. SpotGamma's formula is:

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

Plot net gamma exposure across strikes and the zero gamma level is the price where the total of positive and negative gamma crosses zero.

It moves every day as options positions, expirations and the stock price change, so it's a dynamic support/resistance line that keeps up with current conditions.

The Professional Edge: How to Use Zero Gamma Level in Your Trading

1. Identify Key Support and Resistance Zones

The zero gamma level is a quantitative boundary: past it, dealer hedging behaves very differently. Use it with your usual technical analysis to confirm or question support and resistance, to expect volatility spikes when price crosses zero GEX, and to judge dealer hedging pressure so you can see squeezes or exhaustion coming.

In early 2026, traders who saw SPX struggling near 6,900 zero gamma resistance had a reason to cut risk before the February selloff and VIX spike.

2. Monitor 0DTE Options Flow for Gamma Shifts

Zero-day-to-expiry (0DTE) options now make up more than 60% of SPX volume (Cboe, August 2025), so gamma exposure can change fast during the day.

Professional traders watch 0DTE volume spikes and unusual options activity because they can move net gamma, and with it the zero gamma level, abruptly. On May 28, 2026, for example, heavy multi-million-dollar sweeps in semiconductor ETFs and leveraged products set off rapid gamma shifts that hit the market right away.

3. Use Unusual Options Activity to Predict Gamma Moves

A 2025 LSEG study found institutional flow signals have 65.5% directional accuracy, rising to 71.1% for high-confidence signals, while retail flow is close to random. Put unusual options activity alerts together with gamma exposure data and you can see when large institutional bets are likely to push the market across a zero gamma level.

Optionsbell.com sends email alerts on unusual options activity for $24.99/month, so you can compare the flow with gamma levels.

Gamma Exposure and Market Volatility: The VIX Connection

With SPX above zero gamma, dealer hedging dampens volatility and the VIX tends to drift lower. Below zero gamma, dealer hedging chases the move, and both realized and implied volatility rise.

The February 2026 VIX spike to 28, as SPX broke below the 6,900 zero gamma level, is a clear example of positive gamma suppressing volatility and its loss letting volatility out.

Summary: Why Zero Gamma Level is a Must-Know for Modern Traders

The zero gamma level is the price boundary where dealer hedging behavior flips, and that flip changes how the market moves. Above it, dips get bought and volatility stays low. Below it, moves get amplified and the VIX tends to jump, as it did on the February 2026 break below 6,900. Track the zero gamma level alongside unusual options activity and 0DTE volume, and you'll have a better read on when to enter, when to exit and when to cut risk.

References

SpotGamma, S&P 500 Gamma Exposure Statistics, June 2026.
Linköping University, "Gamma Exposure and Equity Market Volatility," June 2025.
SpotGamma, Market Commentary, February 26, 2026.
VerifiedInvesting, CAR Gamma Squeeze Analysis, April 14, 2026.
Options Data Instagram, INTC Gamma Exhaustion Warning, April 2026.
TradesViz Instagram, Options Flow Summary, May 28, 2026.
LSEG Study, Institutional Options Flow Accuracy, 2025.