SPX gamma exposure levels
SPX is the cash-settled, European-style S&P index option — the instrument most institutional gamma flows through. Its open interest is enormous and its 0DTE volume now rivals the whole rest of the chain, so its gamma levels anchor the entire market's structure.
This page explains how to read SPX's gamma structure. It shows no live numbers — the live map lives in the indicator. Educational context only, not a signal.
Why SPX's gamma matters.
Because SPX is cash-settled and pinned by index desks, its walls and gamma flip are the reference the professional world hedges around. A dense SPX call wall overhead or put wall below often shapes how the whole S&P complex — SPY, ES, and index-tracking names — behaves into the close.
The SPX levels that matter.
Every gamma map is built from a few dealer-positioning levels. On SPX they read like this.
The ceiling
The strike with the heaviest call gamma above spot. Dealers hedge hard there, so it often caps rallies until it breaks.
The floor
The strike with the heaviest put gamma below spot. It often supports dips while dealer hedging holds.
The regime line
Where net dealer gamma crosses zero. Above it hedging dampens moves; below it hedging amplifies them.
Zero-gamma level
The price where dealers flip from long to short gamma — near the flip, it marks where volatility can pick up.
Expiry gravity
The strike that minimises total option-holder payout at expiry — a reference into monthly expiration.
Concentration
The high-concentration strikes between the walls where hedging clusters and price often reacts.
How to read them.
Start with the gamma flip: it tells you which regime SPX is in. When price is accepted above it, dealers are usually long gamma and the tape dampens — tighter ranges, rotation around the levels. When price is below it, dealers lean short gamma and moves amplify — faster, trend-prone sessions. Then read the call wall above and put wall below as the edges dealers hedge hardest.
The levels are a snapshot of positioning, so they go stale as the chain changes through the day — the indicator refreshes them each session. And they are context on how SPX is likely to behave, never an instruction to trade. To learn the mechanics, read how to read dealer positioning and what gamma exposure is.
SPX gamma — questions traders ask.
Why does SPX 0DTE gamma matter so much?
Same-day SPX options now make up a huge share of index volume, so dealer gamma is rebuilt intraday and concentrated near spot. That is why the levels can dampen the index for hours, then unpin sharply when price clears a wall late in the session.
Is this a buy or sell signal?
No. Gamma-exposure levels describe where option dealers hold concentrated hedging pressure — they are context on how a session is likely to behave, not a recommendation to buy or sell and not a prediction of direction. Educational and informational only; trading involves substantial risk of loss.
Where do the live levels come from?
The GEX Levels indicator computes them from the live options chain and draws them on your chart — call wall, put wall, gamma flip, vol trigger and more, refreshed each session. This page explains the concept; the live map lives in the indicator.
See the live SPX map.
The concept is free to read. The live SPX levels — call wall, put wall, gamma flip, the regime and more, refreshed every session — are built into the GEX Levels indicator. The free Morning Map shows the prior session's index levels each day.
Related: SPY gamma levels · ES gamma levels · NDX gamma levels · QQQ gamma levels · all tickers