How to Read a Gamma Exposure (GEX) Chart

What You're Looking At

A gamma exposure chart — sometimes called a GEX profile — plots estimated dealer hedging obligations at each strike price. Each bar represents how much buying or selling pressure dealers would need to exert if price moved to that strike.

The chart answers a deceptively simple question: where are dealers most exposed, and what are they likely to do about it?

Here is a live GEX profile from the Gamma Sonar Pressure Field tool:

Gamma Sonar Pressure Field — TSLA GEX profile with structural levels. Green bars = positive GEX (stabilizing). Red bars = negative GEX (destabilizing). Structural levels labeled on the right.

If this looks overwhelming, don't worry. We'll break down every element.

The Bars: Positive vs. Negative GEX

The most fundamental element of a GEX chart is the direction of the bars.

Green Bars (Positive GEX)

Green bars extend to the right of the center line. These represent strikes where the aggregate gamma exposure is positive — meaning dealers are estimated to be in a position where their hedging activity dampens price movement. If price rises toward a positive GEX strike, dealers sell shares to stay neutral. If price falls toward it, they buy. The result is stabilizing, mean-reverting pressure.

Red Bars (Negative GEX)

Red bars extend to the left. These represent strikes where gamma exposure is negative — dealers' hedging would amplify price movement at these strikes. Price approaching a negative GEX strike triggers hedging flows that push price further in the same direction. Momentum, not mean-reversion.

The Four Key Levels

A GEX chart contains four structural levels that define the trading environment. Once you learn to spot them, you'll see them every time you look at a chart.

1. Call Wall — The Ceiling

The call wall is the strike with the highest positive gamma exposure from call options. It appears as the tallest green bar on the chart, typically above the current price. This is structural resistance — as price approaches the call wall, dealer hedging generates selling pressure that caps rallies.

On the Gamma Sonar Pressure Field, the call wall is labeled with a CALL WALL badge on the right side. In the screenshot above, the call wall sits at 355.

2. Put Wall — The Boundary of Support

The put wall is the strike with the most negative gamma exposure from put options. It marks the edge of the stable zone — while price stays above the put wall, the broader positive-gamma environment provides mean-reverting flows that cushion dips. If the put wall breaks, the environment can flip to negative gamma and dealer hedging turns pro-cyclical.

It's labeled with a PUT WALL badge. In the screenshot, the put wall is at 340.

3. Flip Level — The Regime Boundary

The flip level (sometimes called the gamma flip or GEX zero-line) is the price where aggregate dealer gamma crosses from positive to negative. Above the flip, dealers are estimated to be long gamma — stabilizing. Below the flip, short gamma — destabilizing.

This is arguably the single most important level on the chart. It determines whether the market is in a mean-reverting environment (positive gamma, above the flip) or a trending environment (negative gamma, below the flip). Labeled with a FLIP badge.

4. GVWAP — Center of Mass

The GVWAP (Gamma Volume-Weighted Average Price) is the average strike price weighted by gamma exposure and open interest. Think of it as the center of gravity of the options market. In stable environments, price tends to gravitate toward GVWAP. It's the equilibrium point.

Reading the Spot Price

The current spot price is marked on the chart — in Gamma Sonar, it's the highlighted row with a teal marker. Where spot sits relative to the four structural levels tells you the current environment at a glance:

What the Regime Tells You

Gamma Sonar uses the relationship between spot price and these structural levels to classify the current market into one of seven regimes. Each regime has distinct behavioral characteristics:

Compression — price is near the flip with balanced gamma. Range-bound, mean-reverting. This is the most common regime. Trending Long — price is above the flip in positive gamma. Orderly uptrend with structural tailwind on dips. Trending Short — price is below the flip with mild downward bias. Escape Velocity — price is near the call wall with breakout potential. Pinned — price is at the put wall, support boundary holding. Cascade Risk — negative GEX near the flip, highest risk of self-reinforcing selloff. Negative Gamma — price is below the flip in destabilizing territory.

Gamma Sonar Regime Classifier — shows the current regime, all possible states, and a session history of transitions with timing and GEX values at each shift.

The regime is not a prediction — it's a description of the structural environment. Compression tells you to expect chop. Cascade Risk tells you to expect acceleration if the move continues. The regime shapes strategy selection: mean-reversion strategies work in compression, momentum strategies work in negative gamma, and selling premium works best when the call wall and put wall are containing price.

Reading the Numbers

On the right side of the Gamma Sonar Pressure Field, you'll see numeric columns alongside the bars. Here's what they mean:

GEX value — the raw gamma exposure at that strike, in thousands. Positive values mean stabilizing pressure; negative values mean amplifying pressure. The sign tells you direction, the magnitude tells you intensity.

Open Interest — how many contracts are open at that strike. High OI at a strike means more dealer exposure and more hedging activity if price approaches.

You can also toggle between different greek views using the tabs at the top of the Pressure Field: GEX, Delta, Vanna, Charm, OI, and Stack (which overlays multiple greeks). Each view reveals different aspects of the structural landscape.

The Full Picture

Gamma Sonar platform — Pressure Field in Stack view showing GEX, Delta, Charm, and Vanna overlaid. Full tool suite visible in the sidebar.

The GEX chart is not an isolated data point. It's one layer in a structural framework that includes flow analysis (who is buying and selling), regime detection (what environment are we in), stress monitoring (how close are we to a transition), and second-order greeks like vanna and charm that influence dealer hedging beyond gamma alone.

Common Mistakes

Treating levels as exact prices. The call wall at 355 doesn't mean price reverses at exactly 355.00. It means there's heavy structural pressure in that zone. Think of it as a region of influence, not a line in the sand.

Ignoring the regime. A call wall means something different in compression than it does in escape velocity. The levels only make sense in context of the current gamma environment.

Using GEX as directional prediction. GEX tells you how the market is likely to behave once it starts moving — not which direction it will move. Positive gamma means dampened, negative gamma means amplified. That's the structural expectation. The catalyst that starts the move comes from somewhere else.

Forgetting that positioning changes. The GEX chart is a snapshot of current positioning. As options are opened, closed, and expire, the structure shifts. Yesterday's call wall may not be today's. This is why Gamma Sonar recomputes continuously — every 60 seconds on SPX, SPY, QQQ, and major indices, and every 5 minutes across 90+ additional tickers.

Putting It All Together

When you open a GEX chart, here's the checklist:

That's it. Five questions. With practice, you'll answer them in seconds by glancing at the chart. The structural picture will become as natural as reading a candlestick chart — except this one shows you what dealers are mechanically obligated to do, not what a pattern might suggest.

Expectations, not predictions. That's what a GEX chart gives you.