The bigger picture: GEX + DEX
Regime plus lean, the two-axis read of dealer positioning.
GEX and DEX answer different questions about the same order book. GEX is the regime: will dealer hedging dampen moves (positive gamma) or amplify them (negative gamma)? DEX is the lean: which direction is the open interest actually exposed, and how much stock is hedging it? Read together, they give a two-axis map of the tape.
The four quadrants
- +GEX / +DEX, pinned and call-heavy. The classic grind-up tape: dips get bought by hedging flows, but rallies stall into the big call strikes. Favor mean-reversion and selling premium at the walls.
- +GEX / −DEX, pinned but put-heavy. A market that is hedged and calm: downside is cushioned twice (gamma dampening plus insurance already in place). Vol-crush drift higher is common here.
- −GEX / +DEX, unstable and call-heavy. The fragile melt-up: moves amplify and the crowd is long. Upside continuation can run, but a reversal unwinds both the hedges and the crowd at once, fast, deep pullbacks.
- −GEX / −DEX, unstable and put-heavy. Maximum energy in both directions: accelerating hedges plus a crowded bearish trade. This is squeeze territory, declines cascade, and rallies rip as dealer shorts and put hedges unwind together.
Order of operations
Read GEX first, it sets the character of the day and how to size. Then read DEX, it tells you which side of that regime is crowded and where the asymmetry is. A negative-gamma day is dangerous in both directions; deeply negative DEX on that day says the upside is the crowded exit.When they disagree
The most informative moments are divergences: Total Net DEX flipping sign while the GEX regime holds, or GEX flipping negative while DEX stays stubbornly one-sided. Positioning turned before behavior did, those transitions front-run regime changes on the chart itself.