What is a gamma squeeze?
A gamma squeeze is a rapid, self-reinforcing rally caused by options dealer hedging. When traders buy large amounts of call options in a stock, the market makers who sold those calls must buy shares to hedge. As the stock rises, the calls’ delta increases, forcing dealers to buy even more shares — and that buying pushes the price higher still. The rally feeds itself through mechanical hedging rather than fundamental demand.
How does a gamma squeeze work, step by step?
1. Traders concentrate call buying in a single name, often in short-dated, out-of-the-money strikes where gamma is highest. 2. Dealers who sold the calls are short gamma: their hedge requirement grows as the stock moves toward the strikes. 3. The stock rises, deltas jump, and dealers buy shares to stay hedged. 4. That hedge buying lifts the price further, which raises deltas again — a feedback loop. 5. The loop runs until the call buying stops, the options expire or are sold, or dealer positioning flips — at which point the same mechanics unwind, often violently, as hedges are sold back out.
What’s the difference between a gamma squeeze and a short squeeze?
A short squeeze forces short sellers to buy back stock they borrowed; a gamma squeeze forces options dealers to buy stock as a hedge. They frequently happen together — GameStop in January 2021 combined both — but the fuel is different: a short squeeze runs on short interest, a gamma squeeze runs on concentrated call open interest. The gamma variety can also work in reverse: heavy put buying can force dealers to sell into a falling market.
How do you spot a gamma squeeze forming?
The visible symptoms are surging call volume and open interest stacking in near-dated strikes just above the price. The structural condition is dealer positioning: a squeeze requires dealers to be short gamma in the name, so their hedging amplifies moves instead of dampening them. This is where positioning estimates matter more than flow alerts — seeing the call buying tells you the fuel exists, but knowing how market makers are actually positioned tells you whether it can ignite. SpotGamma’s SGOI estimates market maker and buyside positioning stock by stock, and its HIRO indicator shows the dealer hedging flow in real time as a squeeze develops. See also: gamma exposure (GEX) explained.
Do gamma squeezes only happen in meme stocks?
No. The mechanics operate in any name with a liquid options market — including the S&P 500 index itself, where negative dealer gamma regimes produce the same amplification at the market level. Meme stocks made the term famous because concentrated retail call buying in smaller names produces the most dramatic examples, but dealer hedging feedback is a permanent feature of modern market structure.
Last updated: August 2026 — Published by SpotGamma. For how positioning platforms compare, see our gamma exposure tool comparison.