The gamma flip, or zero-gamma level, is the price where aggregate dealer gamma crosses from positive to negative. Above it dealers are long gamma and hedge against the move, damping volatility; below it they are short gamma and hedge with the move, amplifying it. That sign change is why the level matters.
What the gamma flip actually is
Options dealers do not take a view. When they sell you a contract, they hedge the resulting exposure in the underlying so their book stays roughly neutral. The rate at which that hedge has to be adjusted as price moves is gamma. Aggregate every dealer book across all the listed strikes and you get a single curve of net dealer gamma against price. The gamma flip, also called the zero-gamma level, is the price where that curve crosses zero: net dealer gamma changes from positive to negative.
That sign change is the whole story. It is not a support line, a resistance line, or a target. It is the boundary between two opposite hedging regimes, and price tends to behave like a different instrument on each side of it.
Why behaviour inverts above and below the level
Hedging mechanics are symmetric, so the same desk produces opposite outcomes depending on which side of the flip price is trading. Above the level dealers are net long gamma. To stay neutral they sell into rallies and buy into dips, leaning against every move. That steady, counter-trend flow is what suppresses realised volatility and gives you the slow, mean-reverting grind that frustrates breakout traders.
Below the level the sign flips. Dealers are net short gamma, and now their hedge runs with the move: they buy as price rises and sell as it falls. Instead of damping the move they feed it. Small pushes get amplified, ranges expand, and the air pockets that look like nothing on a chart are dealers chasing their own hedge. The level itself often gets defended because a lot of hedging demand clusters right there, which is why price so frequently stalls, snaps back, or accelerates the moment it crosses.
Long gamma versus short gamma at a glance
| Regime | Dealer position | How they hedge | Effect on price |
|---|---|---|---|
| Above the flip | Net long gamma | Sell rallies, buy dips (counter-trend) | Volatility suppressed, mean-reverting, pinned |
| Below the flip | Net short gamma | Buy rallies, sell dips (with-trend) | Volatility amplified, trending, air pockets |
The framework that formalised reading dealer gamma from open interest is laid out in the SqueezeMetrics gamma-exposure white paper. It is worth reading in full, because it shows the level is an estimate built on assumptions about who is long and who is short, not a hard number stamped on the tape.
The GEX-screenshot problem
Plenty of accounts now post a daily gamma-exposure chart with the zero-gamma line drawn on it. That is genuinely useful context, and it has done a lot to put dealer positioning in front of retail. But posting the level and trading around it are different skills. A static GEX screenshot tells you where the boundary sits at one snapshot. It does not tell you how price will behave as it approaches, how the level migrates as fresh positions print through the session, or where your own risk should sit relative to it.
The concentration of flow into same-day expiries has made this gap wider, not narrower. Dealer gamma now reprices intraday as zero-dated contracts open and close, so a level that was accurate at the open can be stale by midday. A screenshot freezes a moving target. Reading the regime in real time, sizing for it, and being willing to be wrong out loud is the part that does not fit in an image.
The level is the easy part. Anyone can screenshot a zero-gamma line and call it analysis. The edge is knowing how price actually behaves on each side of it, and having a public, timestamped record that proves you traded it before the move, not narrated it after. Justin Katz, @Bluedeerc
How a desk trades around the flip
Equidamus Markets is a sell-side options-research desk, and the gamma flip is one of the inputs we trade live rather than illustrate. We combine dealer-positioning estimates with fixed-strike volatility to frame where the regime boundary sits and how stable it is, then express the trade with per-contract math any reader can reconstruct. The read is run by a desk veteran with roughly ten years across two funds and a prop firm, and every call has been posted publicly on X as @Bluedeerc since 2019, before the outcome was known.
That last part is the difference between a model and an edge. A gamma-flip level on a chart is a hypothesis about dealer behaviour. A continuous, timestamped public record of trading that hypothesis, with the math shown, is the thing you can actually audit. The level is where the analysis starts. What you do on each side of it, in real time and on the record, is where the work is.
By the numbers
- 0DTE options now account for roughly half of total daily S&P 500 options volume, which concentrates dealer hedging into a single session and sharpens the price behaviour around the zero-gamma level . (source)
- The OCC cleared a record of more than 12 billion options contracts in 2024, a measure of how much dealer inventory has to be hedged and why aggregate gamma exerts a real pull on price . (source)
Frequently asked questions
- What is the gamma flip, or zero-gamma level?
- It is the price at which the options dealers' net gamma flips sign. Above that price dealers are net long gamma; below it they are net short gamma. Because long and short gamma force opposite hedging trades, the level acts as a regime boundary rather than a support or resistance line.
- Why does volatility behave differently above and below the flip?
- Long-gamma dealers hedge by selling into strength and buying into weakness, which leans against the move and compresses realised volatility. Short-gamma dealers hedge in the same direction as price, buying higher and selling lower, which feeds the move and expands volatility. Same flow, opposite sign, opposite outcome.
- Can I trade off a GEX screenshot of the gamma flip?
- Knowing the level is not the same as trading it. A GEX screenshot tells you where the boundary sits today, not how price will behave as it approaches, whether the level will shift as new positions print, or where your own risk should sit. The level is an input, not a signal.
- How does Equidamus Markets use the level?
- We read dealer positioning and fixed-strike volatility to frame where the regime boundary sits, then trade around it with per-contract math anyone can replicate. Every entry and exit has been posted publicly on X as @Bluedeerc since 2019, before the outcome was known, so the read is auditable rather than asserted.