Reading options gamma exposure (GEX) for intraday context
Gamma exposure tells you where dealers are positioned and where they are forced to hedge. The AnalyticsFX GEX dashboard visualizes the strikes and the gamma flip that actually matter.
Most retail traders interact with options market structure without knowing it. Dealer hedging flows quietly set the floor and ceiling of an intraday range. Gamma exposure (GEX) is the single best lens for seeing those flows in advance.
What GEX measures
Every option contract has a gamma value: the rate at which its delta changes as the underlying moves. When dealers are net long gamma, they hedge by selling rallies and buying dips. This compresses realized volatility and tends to pin prices to large strikes. When dealers are net short gamma, the opposite is true: they buy rallies and sell dips, amplifying moves.
GEX is the sum of gamma exposure across all open contracts, signed by which side dealers are on, plotted as a function of strike.
What you see on the AnalyticsFX GEX page
The chart is a horizontal bar plot with three series:
- Call GEX at each strike (positive contribution).
- Put GEX at each strike (negative contribution).
- Net GEX as the signed sum, with a cumulative line overlaid on a secondary x-axis.
Key levels are drawn directly on the chart:
- Gamma flip. The strike where net GEX crosses zero.
- Spot price band. A subtle highlighted zone around the current underlying price, only drawn when the spot is inside the visible range.
- Largest positive and negative gamma strikes. The strikes that matter today.
A percentile-based x-axis range clips outlier strikes so the rest of the chart is not crushed. If the 95th percentile is already close to the actual max, the chart uses the actual max instead so genuine extremes are still visible.
How traders use GEX
There is no single GEX trade. The way most traders integrate it is as context:
- Above the gamma flip. Dealers are long gamma, market is suppressive. Mean-reverting strategies tend to work better. Breakouts tend to fail.
- Below the gamma flip. Dealers are short gamma, market is reflexive. Breakouts tend to extend. Mean reversion gets dangerous.
- Approaching a large positive gamma strike. Expect pinning, especially on expiration days.
- Approaching a large negative gamma strike. Expect acceleration in the direction of the move.
None of these is a signal on its own. All of them filter or size other signals.
Limitations
GEX is computed from publicly available open interest. It is a snapshot, not a forecast. Intraday positioning can shift inside the day in ways that only show up the next morning. Treat the GEX page as a daily map, not a tick-by-tick guide.