What traders mean by a gamma ramp
A gamma ramp is a run of strikes above the current price, each carrying progressively more call gamma than the last, described as a staircase the market can climb. The claim attached to it is mechanical: as price rises into each successive strike, hedging demand grows, that demand pushes price into the next strike, and the process feeds itself. The GEX calculator for any US stock is the per-strike chart that shape is read from.
Two things are worth establishing first. It is desk jargon rather than a defined quantity, and the acceleration story requires a positioning assumption that is the reverse of the one most public gamma data is built on.
Not a standardised term
Gamma itself has a definition you can look up, maintained by the Options Industry Council. "Gamma ramp" has no equivalent entry at the OIC or the exchange and no formula behind it. Nobody publishes a ramp steepness figure the way they publish a call wall. It is a shape people see in a per-strike gamma chart, and different observers draw its boundaries differently. Treat a claim about "the ramp" as a chart reading, not a measurement.
The accelerant story needs dealers short calls
Here is the part that gets skipped. For rising price to force buying, the hedging desk has to be short those calls. A short call carries negative delta, so as spot climbs the position delta grows more negative and the hedger buys stock to stay neutral. Buying into strength, and buying more the higher it goes, is a genuine feedback loop. That is the gamma squeeze.
But the convention behind public gamma numbers assumes the other side. The SqueezeMetrics gamma exposure white paper, the document that put this framework into circulation, states it as an explicit assumption: "Call options are sold by investors; bought by market-makers." Under that assumption dealers are long the calls above spot, and the paper's own worked example gives the resulting trade: "if the underlying moves up 1 point and the new delta is 60, the market-maker will short-sell 10 shares. If the underlying moves down 1 point and the new delta is 40, the market-maker will buy back 10 shares."
Selling into a rally is not a ramp. It is a brake. Every step up meets more supply, which is exactly why the same framework describes heavy call gamma above spot as resistance.
Both stories exist, separated by an assumption nobody can observe. Open interest records that a contract exists; it never records which side of it a dealer is on. The customers-sell-calls assumption is a reasonable prior for index products, where overwriting and collaring dominate, and a poor one for a single name absorbing a wave of retail call buying, which is the setup where ramps actually produce squeezes. Dealer hedging covers where each prior holds.
Why the shape steepens into expiration
The metaphor does capture something real about how gamma is distributed. It is not spread evenly: the OIC's gamma primer notes that "Gamma is higher for options that are at-the-money and closer to expiration," and that "Deep-in-the-money or far-out-of-the-money options have lower Gamma than at-the-money options."
So a ramp visible a week out is a much flatter object than the same open interest on expiration morning. The staircase does not stay put. It sharpens, narrows, then vanishes at settlement along with whatever hedging flow it was generating. The gamma exposure heatmap is where that time dimension is legible, because it holds each expiration in its own column instead of summing them: a ramp loaded into this Friday and one spread across the quarter are the same total and a different object.
Reading it without the story attached
The defensible use of a ramp is descriptive. It tells you where call gamma is concentrated above spot, and therefore where hedging behaviour changes character, whichever direction that hedging runs. Pair it with the call wall for the single largest concentration.
On our free SPX gamma page, the 25 August 2026 snapshot put the call wall at 7,800 against spot of 7,672.86, with the largest gamma strike further out at 8,000, computed from 20,038 contracts against the prior session's settlement open interest. We print no hold rate next to that wall. We printed one until August 2026 and withdrew it: it was measured on a third-party definition of a wall, and it counted every session price never approached the level as a hold. A level derived from an unverifiable positioning assumption does have to earn trust from its record rather than from its mechanism, which is why what we print instead is the capture time, the settlement open interest behind the level, and a timestamped log of what the structure did.
Educational content, not financial advice. See our risk disclosure.