GEX Heatmap:
How to Read Multi-Expiration Gamma

What the GEX Heatmap Shows

The standard GEX profile chart answers a simple question: where is gamma concentrated for a single expiration? That's useful for day-trading around 0DTE or weekly levels. But options chains have dozens of active expirations at any time — from tomorrow's 0DTE to LEAPS months away. The gamma from all of those expirations adds up at each strike, and the GEX Heatmap is the tool that lets you see the full picture.

The heatmap is a two-dimensional grid. Strike prices run along the Y-axis. Expiration dates run along the X-axis. Each cell in the grid represents the gamma exposure at that specific strike for that specific expiration. The color and intensity of the cell tell you the magnitude and direction of that gamma.

Instead of cycling through expirations one by one, you can scan the entire gamma landscape in a single view. Patterns that are invisible on a single-expiry chart — like the same strike showing up with heavy gamma across five different expirations — become immediately obvious.

Reading the Colors

The heatmap uses a diverging color scale to distinguish call-side gamma from put-side gamma:

The most important cells are the brightest ones. A vivid green cell at $570 for next Friday's expiration means that strike carries significant positive gamma for that date — dealers holding those positions will buy dips toward $570 and sell rallies away from it. A vivid red cell means the opposite: dealer hedging at that strike amplifies directional moves.

Faint or near-neutral cells are strikes where gamma is negligible. You can safely ignore them — they won't generate meaningful hedging flow.

Gamma Clusters and Why They Matter

The single most valuable pattern on the heatmap is the gamma cluster: a strike that lights up across multiple expiration columns, forming a bright vertical band.

Why are clusters more important than isolated bright cells? Because gamma from a single expiration is temporary — it disappears after that expiry. But when five or six expirations all carry heavy gamma at the same strike, that level has structural persistence. Even after one expiration rolls off, the gamma from the remaining dates keeps the level active.

• Vertical green band: A strike with call gamma reinforced across many expirations. This is a strong support/resistance magnet — price tends to pin near this level and mean-revert when displaced.
• Vertical red band: A strike with put gamma across multiple dates. This marks a zone where dealer hedging will amplify moves — a breakout through this level can accelerate because dealers are selling into weakness at scale.
• Isolated bright cell: Heavy gamma for a single expiration only. Important for that specific date, but the level weakens immediately after expiry. Useful for intraday plays, less useful for multi-day positioning.

Spotting Expiration-Driven Gamma Shifts

Every Friday (and on monthly/quarterly expiration dates), a column of gamma rolls off the board. The heatmap makes this process visual and predictable.

Before expiration, look at the leftmost column (the nearest expiry). If that column contains the brightest cells at a given strike, it means most of the gamma at that strike is concentrated in the expiring date. After Friday's close, that column disappears — and so does the gamma level it was supporting.

1. Identify the expiring column. Look at how much of the total gamma at key strikes comes from that single date.
2. Compare to remaining columns. If the same strike also lights up in next week's and next month's columns, the level will persist after expiry. If the expiring column is the only bright one at that strike, the level will weaken or vanish.
3. Plan accordingly. Levels that survive expiration are the ones to anchor your analysis around for the following week. Levels that were entirely supported by the expiring date need to be removed from your mental map.

Heatmap vs. Single-Expiry GEX Chart

Both tools show gamma exposure, but they answer different questions:

The two views are complementary. Start with the heatmap to identify which strikes are structurally important across the full chain. Then drill into the single-expiry chart for the specific date you're trading to get precise GEX values and the exact Call Wall / Put Wall levels for that expiration.

Practical Examples: Finding the Strongest Levels

Here's a step-by-step workflow for using the heatmap to identify actionable support and resistance:

1. Open the heatmap and zoom to the relevant strike range. Focus on strikes within 3-5% of the current spot price — that's where gamma has the most hedging impact.
2. Scan for vertical bands. Which strikes show consistent color across 3+ expiration columns? These are your structural levels. Note whether they're green (call gamma, supportive) or red (put gamma, accelerating).
3. Check for the "gamma cliff." Is there a strike below which the heatmap turns predominantly red? That's your structural support floor. Below it, dealer hedging flips from stabilizing to amplifying — a break of that level tends to accelerate.
4. Assess expiration risk. If you're heading into Friday, look at the nearest expiry column. Are any of your key levels dependent entirely on gamma from the expiring date? If so, those levels have an expiration date too.
5. Cross-reference with the GEX profile. Switch to the single-expiry view for the date you're trading. The strikes the heatmap flagged as clusters should also show up as prominent bars on the profile. If they do, you have high-confidence levels.

The heatmap transforms gamma analysis from a single-expiry snapshot into a structural map of the entire options chain. Instead of guessing which levels matter, you can see which strikes are reinforced by the broadest set of expirations — and which ones are one Friday away from disappearing.

Multi-Ticker Gamma: What GEXBoard's Data Shows

GEXBoard tracks gamma across 30 tickers simultaneously. Here's a ranking of average absolute gamma exposure from our database (March 17–29, 2026) — the tickers where dealer positioning has the most impact on price:

This data explains why the heatmap is most valuable for SPY, QQQ, and the major indices — they carry the largest gamma concentrations, which means dealer hedging at those levels has the most mechanical impact on price. Single-stock gamma (NVDA, TSLA, etc.) is smaller in absolute terms but can still be significant relative to the stock's average daily volume.

Notice the wall spread differences: SPX has a 197-point spread while QQQ has a $29.50 spread. Wider spreads mean more room for price to move before hitting structural resistance. Narrower spreads suggest tighter dealer containment. When you're comparing gamma across tickers on the heatmap, the wall spread gives you context for how "sticky" or "loose" each name is likely to trade.