What a Gamma Regime Is
A gamma regime describes how options dealers are forced to hedge as the underlying moves — and whether that hedging dampens or amplifies price action. It isn't a forecast of direction. It's a description of the market's mechanical response function: given a move in spot, which way does aggregated dealer hedging push next?
The regime is set by the sign of net dealer gamma, which the Greeks dashboard aggregates as Gamma Exposure (GEX). When the net position is positive gamma, dealer hedging leans against the move and volatility is suppressed. When it's negative gamma, dealer hedging leans with the move and volatility is fed. Everything else in this guide follows from that single sign.
The sign is what matters, not the size alone. A large positive GEX and a large negative GEX behave in opposite ways. Reading the magnitude without the sign tells you nothing about whether moves will be pinned or amplified.
The Gamma Flip Level
The gamma flip is the price where net GEX crosses zero — the boundary between the two regimes. On the Greeks backend, the regime is defined precisely: positive when spot is at or above the gamma flip, negative when spot is below it. Cross the flip and the regime changes with it.
Why does the sign flip at a specific strike? Dealer gamma is not uniform across the chain. Above certain strike concentrations, aggregate dealer gamma tends to be long; below them, it tends to be short. The flip level is simply the price at which those contributions net to zero. As spot travels through the strike ladder, the balance tips, and the crossover point is the flip.
gammaFlip = strike where net GEX crosses zero
spot above flip → positive gamma → dealers dampen
spot below flip → negative gamma → dealers amplify
Because the flip is a level, not a mood, it gives you an objective line on the chart. Price trading a few points above it behaves very differently from price trading a few points below it — even though the tape looks identical to the naked eye.
Positive Gamma: Dealers Stabilize
In a positive gamma regime, dealers are net long gamma. To stay delta-neutral they must buy dips and sell rips: when price falls their hedge requires buying, when price rises their hedge requires selling. That counter-trend flow leans against whatever the market is doing, which is why positive gamma is associated with pinned, mean-reverting, range-bound tape.
This is the classic quiet-grind environment. Moves get faded, intraday ranges compress, and price tends to gravitate toward high-gamma strikes near Max Pain. Realized volatility usually runs below what implied vol is pricing, because the dealer hedging flow is actively working to hold price in place.
Positive gamma, in one sentence: the market's own hedging machinery is short-term stabilizing, so dips get bought and rallies get sold — favoring range-bound tactics like fading extremes and selling premium into the pin.
Negative Gamma: Dealers Amplify
In a negative gamma regime, dealers are net short gamma. Now the hedge runs the other way: to stay neutral they must sell dips and buy rips. When price falls they sell into it; when price rises they chase it. That pro-trend flow pours fuel on the existing move, which is why negative gamma is associated with trending, volatile, gap-prone tape.
This is the environment where selloffs accelerate and breakouts extend. Realized volatility tends to exceed implied, ranges expand, and the same catalyst that would get faded above the flip instead triggers a cascade below it. It is not a directional signal on its own — negative gamma amplifies moves both ways — but it changes the character of every move that starts.
A note on who is short gamma. It is a simplification to say "dealers are always short gamma." Whether the aggregate dealer book is long or short depends on positioning across the chain — index dealers are frequently long gamma above the flip and short below it. The regime label tells you the current net sign; don't assume it's fixed.
| Dimension | Positive Gamma | Negative Gamma |
|---|---|---|
| Dealer hedging | Buy dips / sell rips | Sell dips / buy rips |
| Price action | Range-bound, mean-reverting, pinned | Trending, gap-prone, extends breakouts |
| Volatility | Suppressed — realized often below implied | Amplified — realized often above implied |
| Your tactics | Fade extremes, sell premium, target the pin | Respect trend, widen stops, size down |
Intraday Regime Flips and Why Timing Matters
The regime is not fixed for the day. As spot travels through the gamma flip, the sign of net GEX changes and the regime flips with it. The Greeks intraday feed records exactly when this happens: the flippedAt field is the timestamp of the last regime change today (0 if there has been none), and flippedFrom records the prior regime.
Timing matters because a flip changes the market's response function mid-session. Price that was getting faded all morning in positive gamma can suddenly start trending the moment it slips below the flip into negative gamma — the same selloff that would have been bought now gets sold into. A late-day loss of the flip level is a common ingredient in end-of-day acceleration.
Watch the flip like a level, not a headline. When flippedAt is non-zero, the regime already changed once today — check flippedFrom to see the direction of the transition and re-evaluate whether your range-bound or trend-following bias still fits the current tape.
Tracking the Regime on Greeks
The /api/analytics/gex-intraday endpoint (Pro+) surfaces the live gamma regime. It returns the current regime label ("positive" or "negative"), the crossover timestamp via flippedAt and flippedFrom, and a points[] time-series where each entry carries the timestamp, spot, net GEX, gamma flip, and regime at that moment. An updatedAt field marks the last refresh.
That time-series is what lets you see the regime evolve rather than just its current snapshot. You can watch spot approach the gamma flip, see the exact bar where net GEX crossed zero, and confirm whether the market's behavior changed to match. Combined with the GEX dashboard and dealer delta-hedging view, it turns an abstract regime into a level you can trade around.