What are the dealers actually doing?
Behind every gamma-exposure level is a simpler question: which way are the options dealers forced to hedge, and how hard? That single fact — are they dampening the move or amplifying it — shapes how a session behaves. This page explains how to read dealer positioning from the greeks: gamma, delta, vanna and charm. It shows no live data; the live read lives in the indicator.
This page is educational context only. It is not a signal, not a prediction, and not financial advice.
The one idea: short gamma amplifies, long gamma dampens.
When a customer buys or sells an option, a dealer takes the other side and hedges it in the underlying to stay neutral. The sign of the dealers' net gamma decides which way that hedging pushes the tape.
When dealers are long gamma (positive net GEX), their hedging leans against the move: they sell into rallies and buy into dips. That dampens volatility — ranges stay tighter and price tends to rotate around the levels. When dealers are short gamma (negative net GEX), their hedging leans with the move: they buy strength and sell weakness. That amplifies volatility — moves extend and can accelerate.
The level where net gamma crosses zero is the gamma flip. Above it the market is usually in the dampening regime; below it, the amplifying one. Knowing which side of the flip price sits on is the single most useful thing dealer positioning tells you.
The greeks that describe the hedging.
Dealer exposure is not one number. Each greek describes a different hedging pressure, and each one is the sum of the dealers' position across every strike.
How the move is hedged
Net dealer gamma. Positive = dealers dampen the move (buy dips, sell rips). Negative = dealers amplify it. The gamma flip is where this sign changes near spot.
The directional lean
Net dealer delta — the directional hedging already in place. Combined with the gamma sign it gives the regime quadrant below.
What a change in IV does
How much dealer delta shifts when implied volatility moves. Positive net vanna means a rise in IV nudges dealer hedging to be supportive; negative means it adds pressure.
The drift into the close
The decay of dealer delta as time passes. Net charm drives a mechanical delta drift into the close and overnight — a structural lean, strongest near expiry.
Pressure from absolute IV moves
Dealer exposure to the level of implied volatility itself — the pressure that builds when the whole volatility surface repriced up or down.
Where gamma is concentrated
The strike carrying the largest dealer gamma. It marks where hedging is densest — a reference, not a magnet (see the honest note below).
The regime quadrant: gamma times delta.
Put the sign of net gamma together with the sign of net delta and you get four structural regimes. This is descriptive context on how the day tends to behave — never an instruction to trade.
Maximum dampening
Hedging fades rallies and buys dips from both gamma and delta. The tightest range.
Dampened but heavy
Gamma pins the range while delta leans down. Rangebound, with a soft ceiling.
Unstable upside
Hedging amplifies moves while delta supports dips. Extensions can run.
Maximum acceleration
Hedging amplifies and delta leans down. Breakouts and breakdowns run.
One more structural flag matters: when the vol trigger (the zero-gamma price level) sits very close to the gamma flip, the two form a narrow corridor where net gamma is crossing zero. Dealer hedging flips sign across that band, so realized volatility tends to run hot while price is inside it.
The honest part: what actually holds up.
Most indicators sell dealer levels as magnets and reversal signals. We tested our own on more than five years of data before making any such claim — and we won't make the ones the data does not support.
Fading a wall on contact, or expecting price to be pulled into the pin at expiry, did not survive testing: across every form we tried, those effects were indistinguishable from randomly placed levels. So we do not present the pin as a magnet or the walls as automatic reversal points.
What did show a pulse was the regime itself — whether dealers are short or long gamma. That is why the indicator frames dealer positioning as context on how the day is likely to behave (dampened versus amplified), rather than as a level that predicts a turn. It is the honest use of the data, and it is the one the evidence backs.
Questions traders ask about dealer positioning.
What is gamma exposure (GEX)?
Gamma exposure is the net gamma that options dealers hold across all strikes, expressed as the hedging a set move in the underlying forces them to do. Positive net GEX means dealers dampen volatility (they buy dips and sell rallies); negative net GEX means they amplify it. The level where it crosses zero is the gamma flip.
What is the difference between short gamma and long gamma?
It describes which way dealer hedging pushes the market. Long gamma (positive GEX) means hedging leans against the move and dampens it — quieter, mean-reverting sessions. Short gamma (negative GEX) means hedging leans with the move and amplifies it — trends and sharp extensions become more likely.
What do vanna and charm exposure tell me?
Vanna is how much dealer delta shifts when implied volatility changes — it matters most around volatility spikes. Charm is how dealer delta decays as time passes — it drives a mechanical delta drift into the close and overnight, strongest near expiry. Both are structural context, not signals.
Does price get pulled toward the pin (max gamma strike)?
Not reliably. We backtested the idea directly and price did not gravitate to the dominant gamma strike any more than to a random nearby strike — the apparent pull is mostly that the pin sits near the money, which is already near the close on expiry days. We show the pin as a reference for where hedging is concentrated, never as a magnet or a prediction.
Is this a buy or sell signal?
No. Dealer positioning is context on how a session is likely to behave — dampened or amplified — not a recommendation to buy or sell and not a forecast of direction. It is educational and informational only, not financial advice, and trading involves substantial risk of loss.
Read the live dealer positioning.
The concept is free to read. The live read — signed-flow or settlement basis, the regime, the per-greek exposure, the pin and the expected move — is built into the GEX Levels Indicator for subscribers. It pairs with the Fear Score and gamma exposure levels.