Long Gamma, Short Gamma: When Dealer Hedging Calms a Market and When It Pushes

[Shadow Trader]

Options dealers who have sold options to clients often end up short gamma, while those who have bought options are long gamma. The sign matters because delta hedging follows price. A dealer long gamma sells into rallies and buys into dips to stay neutral, which tends to compress ranges. A dealer short gamma must buy as price rises and sell as it falls, which can push a move further.

Delta is an option's sensitivity to spot, and gamma is how quickly that delta changes. Close to the strike of a short-dated option, gamma is at its highest, so small spot moves force noticeably larger hedge adjustments. Far from the strike, hedging needs fade.

For a scalper, the practical reading concerns behavior rather than prediction. Choppy, mean-reverting tape around a heavily traded strike may partly reflect hedging that leans against price, while a break away from such a zone can sometimes accelerate. Dealer positions are private, aggregated estimates vary widely, and hedging is spread across many firms and venues, so any such view remains a hypothesis.

Gamma is best treated as one possible explanation for the texture of price, not as a signal. Spread, slippage and a clear plan still decide whether a short-term trade makes sense.