Gamma walls, GEX magnets and the HVL flip explained

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.

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.

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