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Every options contract carries a delta (how much its price moves per $1 in the underlying) and a gamma (how fast that delta changes). Options dealers — primarily market makers at large banks and ETF liquidity providers — hold the opposite side of most customer flow and stay delta-neutral by hedging in the underlying. Gamma Exposure aggregates the dollar-gamma sitting at every strike and tells us how aggressively dealers must hedge as price moves through those strikes.
Dealer hedging is mechanical, predictable, and large. A single $1B notional gamma cluster forces hundreds of millions of dollars of buying or selling as price brushes the strike. That flow is what makes certain prices behave like magnets, ceilings, or trampolines — not magic, just inventory management at scale.
Convention here: +gamma shows where dealers are long gamma (typically dealer-short-puts → calls cluster), −gamma where they are short gamma. Sign convention follows insiderfinance.io.
Dealers are net long gamma. To stay delta-neutral they sell rallies and buy dips. Their flow leans against the prevailing move, which compresses realized volatility and pulls price toward the heaviest strike. Expect range-bound tape, fading edges, and quiet drift toward the dominant Call Wall.
Dealers are net short gamma. To stay neutral they must sell into weakness and buy into strength — pro-cyclical hedging. This amplifies realized vol: small moves cascade, gaps fill late or not at all, and ranges expand. Trend-following works; mean-reversion punishes.
| Level | What it is | Intraday playbook | Default |
|---|---|---|---|
| Call Wall | The strike carrying the largest positive gamma. Heavy dealer call exposure here means that as price approaches, dealers must sell into rallies to stay hedged. | Acts as resistance / pinning magnet on expiry days. Rallies into it tend to stall; clean breaks above are meaningful regime shifts. | ● ON |
| Put Wall | The strike with the largest negative gamma. Heavy dealer put exposure means that as price falls toward it, dealers buy the underlying to hedge — a structural bid. | Acts as support / bounce zone. First tests usually bounce. Breaks below it are typically violent because the cushion disappears. | ● ON |
| Gamma Flip | The price at which aggregate dealer gamma switches sign. Above it, dealers are long gamma (dampening). Below it, dealers are short gamma (amplifying). The single most important level on the chart. | Regime gate. If price is above and holding: fade noise. If price loses it on volume: switch to trend mode, widen stops, expect range expansion. | ● ON |
| 2nd Call Wall | The second-largest positive-gamma strike. The next layer of dealer resistance above the primary Call Wall. | Useful as a profit target after a clean break above the Call Wall, or as a stretch level when the primary one is too close to spot to matter. | ○ OFF |
| 2nd Put Wall | The second-largest negative-gamma strike. The next support shelf below the primary Put Wall. | Where to look for a capitulation bid if the primary Put Wall fails. Often a better risk-defined long than the first wall. | ○ OFF |
| HVL · High Volume Level | The strike where dealer hedging is most balanced between calls and puts — the largest min(call gamma, put gamma). By construction it's distinct from the walls (which are one-side-dominant strikes) and identifies the price where dealers from both sides are actively hedging at the same time. | Acts as a magnet in positive-gamma regimes. Useful as a mean-reversion target and as a context anchor when price is drifting between the walls. Often sits very close to current spot. | ○ OFF |