What Is Net Gamma?
Net gamma is call gamma minus put gamma summed across an options chain — a single number showing which direction dealers are net hedging in, and whether that hedging is likely to dampen or amplify price moves.
Net Gamma vs. Gross (Total) Gamma Exposure
There are two standard ways to combine call and put gamma at a given strike, and mixing them up leads to real confusion:
Net gamma answers “which side is dominant, and which way does dealer hedging lean?” Gross gamma answers “how much total positioning exists here, regardless of direction?” A strike can carry enormous gross gamma from heavy call and put open interest sitting side by side, while its net gamma sits close to zero because the two sides largely cancel out. Both readings are useful; they just answer different questions, and most GEX discussion — the overall market regime, the gamma flip level — is really talking about the net figure.
How to Read a Positive Net Gamma Regime
When net gamma is positive, dealers are net long gamma across the board. As price rises, their hedges require selling; as it falls, their hedges require buying. That counter-trend flow tends to keep price oscillating inside a range rather than trending hard in one direction — this is the backdrop where call walls and put walls do their clearest work as a ceiling and floor.
How to Read a Negative Net Gamma Regime
When net gamma is negative, dealers are net short gamma. Their hedging now runs with the move — selling into declines, buying into rallies — which can turn an ordinary pullback into a faster, more volatile one. Negative gamma stretches are when wall levels are most likely to give way rather than hold, since the mechanical flow that would otherwise defend them is pointed the other way.
Where the Regime Flips: the Gamma Flip Level
Net gamma isn't fixed — it's a function of the underlying's current price, since each strike's gamma changes as price moves toward or away from it. The specific price where net gamma crosses from positive to negative (or back) is the gamma flip level, sometimes called the zero gamma level. It's arguably the single most important reference point in gamma analysis, because it marks the boundary between two genuinely different volatility regimes, not just a price level.
How GammaWalls Reports Net Gamma
GammaWalls surfaces this as a straightforward GEX Regime read — Positive Gamma or Negative Gamma, with the actual net GEX figure in dollars alongside it — for SPX and ES, checked automatically throughout the trading day rather than as a single morning snapshot.
Frequently Asked Questions
Is net gamma the same thing as gamma exposure (GEX)?
Net gamma is one specific way of reading gamma exposure data — the directional summary (calls minus puts) of the full GEX profile, rather than the profile itself. GEX describes the whole picture across every strike; net gamma is the single headline number for which side dominates overall.
What does it mean when net gamma is positive?
Dealers are net long gamma in aggregate, meaning their hedging tends to counter the prevailing price move — buying weakness, selling strength — which typically compresses realized volatility.
What does it mean when net gamma is negative?
Dealers are net short gamma in aggregate, meaning their hedging tends to reinforce the prevailing move — selling weakness, buying strength — which typically expands realized volatility.
How do I know when the net gamma regime is about to flip?
By tracking distance from the current price to the gamma flip level — the specific price where net gamma crosses zero. The closer spot sits to that level, the more likely a regime change is imminent.
GammaWalls scores every wall automatically — Fragile, Moderate, Strong, or Dominant — so you don't have to eyeball a gamma chart to tell which levels actually matter.
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