Gamma Walls: Call Wall & Put Wall Explained

Gamma walls are the price levels where heavy option open interest forces dealers to hedge — turning a call wall into resistance and a put wall into support. They are the tradeable output of gamma exposure (GEX).

Senzoukria · Learn · Updated June 2026

If GEX tells you the regime, gamma walls tell you the levels. They are the strikes where so much option open interest sits that dealer hedging turns them into support and resistance you can trade around.

Why walls exist

Dealers hold the other side of the options crowd. At strikes with heavy open interest, the gamma is concentrated — so as price nears that strike, dealers must hedge hard, and their hedging pushes back against price. Two walls matter most:

Call wall = resistance

At a call wall (heavy call open interest), dealers who are short those calls sell the underlying as price rises toward the strike. That selling is natural resistance — rallies often stall at the call wall.

Put wall = support

At a put wall (heavy put open interest), dealers buy the underlying as price falls toward the strike. That buying is natural support — declines often slow or stop at the put wall.

The high-gamma magnet

The single highest-gamma strike acts as a gravitational center. In a positive-gamma regime, price tends to get pinned toward it, especially into option expiry when gamma is most concentrated. Many range days are simply price oscillating between the put wall and the call wall around that magnet.

Walls + regime: the crucial caveat

Walls are only reliable when you respect the gamma regime:

  • Positive gamma: walls hold well — fade toward them, expect the range.
  • Negative gamma: a broken wall can turn into an accelerant — once price pushes through, dealer hedging now chases the move. See the zero-gamma flip.

How to trade gamma walls

  • Mark the call wall, put wall and highest-gamma strike at the start of the session.
  • In positive gamma, fade moves into a wall back toward the magnet.
  • Treat a clean break of a wall (with momentum) as a regime signal, not a dip to buy.
  • Confirm with order flow at the level — heavy absorption at a put wall is a strong support tell.

Key takeaway: call wall = resistance, put wall = support, highest-gamma strike = magnet — but only as strong as the gamma regime behind them. Combine the wall with the footprint at that price for confirmation.

See the walls live

Senzoukria plots the call wall, put wall and zero-gamma level alongside your footprint, so you can watch how price and order flow behave exactly at the gamma levels. Free preview, no card — start here.

Frequently asked questions

What is a call wall?
A call wall is a strike with heavy call open interest. As price approaches it, dealers who are short those calls sell the underlying to hedge, which acts as natural resistance. It often caps rallies until positioning shifts.
What is a put wall?
A put wall is a strike with heavy put open interest. As price falls toward it, dealers buy the underlying to hedge, which acts as natural support. It frequently halts or slows declines.
Do gamma walls always hold?
No. Walls are strong levels, not guarantees. They work best in a positive-gamma regime; in negative gamma a wall can break and the move accelerate. Walls also move as positioning changes and reset around option expiry.