Gamma Walls, GEX Magnets and the HVL Flip

The three building blocks of a gamma map: walls that cap and support, GEX magnets that pull price, and the HVL flip that changes the regime.

A gamma map has three moving parts. Once you can name them, a wall of numbers becomes a simple story about where the market is likely to react.

Gamma walls

A wall is a price with a heavy concentration of options positioning. Above spot, a call wall often acts as resistance: hedging leans against further upside. Below spot, a put wall often acts as support. Walls are not guarantees, but they are the levels where reactions cluster.

GEX magnets

GEX, or gamma exposure, summarises how much hedging pressure sits at each price. Strong positive exposure tends to pin price and dampen volatility, pulling it toward a magnet into the close. When exposure flips negative, hedging adds fuel to moves instead of absorbing them.

The HVL flip

The HVL is the level where the hedging regime changes. Above it, conditions tend to be stabilising: dips get bought and ranges hold. Below it, conditions tend to be amplifying: moves extend and volatility rises. How price behaves around the HVL is often more useful than any single wall.

Price above the HVL: a dampening regime. Price below it: an amplifying regime.

Putting it together

Trade toward magnets in a stabilising regime.
Respect walls as reaction zones, not hard stops.
Treat a clean break of the HVL as a change of character.

This is the detailed breakdown; for a plain-English overview of what gamma levels are and how traders use them, start with what are gamma levels. To see the three parts used together in a live session, follow the SPX / ES framework.

FAQ

What's the difference between a wall and a magnet?

A wall is a concentration of positioning that tends to cap or support price - a reaction zone. A magnet is a price that positive-gamma pinning draws price toward into an expiry. One resists, the other attracts.

What does the HVL flip actually change?

It marks where the hedging regime switches from stabilising - dips bought, ranges holding - to amplifying, where moves extend and volatility rises. Behaviour around the HVL is often more telling than any single wall.

Is GEX the same as a gamma wall?

No. GEX (gamma exposure) measures how much hedging pressure sits at each price; a wall is a specific strike where that exposure is concentrated. GEX is the measure, the wall is where it stacks up.

Gamma Axis marks all three every session for SPX/ES and NDX/NQ.