A gamma squeeze is a self-reinforcing rally driven by options dealers hedging short call positions. As price rises into heavily traded call strikes, dealers are forced to buy the underlying to stay hedged — which pushes price higher, which forces more buying.
It is a feedback loop made entirely of mechanical flow.
The loop
- Traders buy calls aggressively, usually short-dated and out of the money.
- Dealers, taking the other side, are short those calls. They hedge by buying stock.
- Price rises toward the strikes. The calls gain delta.
- Gaining delta means the existing hedge is now too small — dealers must buy more stock.
- That buying lifts price further, pushing the next strike into play.
Each rung of the ladder forces the buying that reaches the next rung. Nothing about it requires anyone to believe the stock is worth more.
Why it needs negative gamma
The loop only runs when dealers are short gamma. In positive gamma they sell into strength, damping the move. The setups that squeeze are the ones where dealers are net short calls — heavy retail call buying, low float, and strikes stacked just above spot.
That combination is why gamma squeezes cluster in small caps and heavily-shorted names rather than mega-cap index components.
Gamma squeeze vs short squeeze
These get used interchangeably and should not be.
- A short squeeze is equity short sellers covering.
- A gamma squeeze is options dealers hedging.
They frequently occur together — a squeezing stock attracts call buyers, whose dealers then buy stock, which pressures the shorts further. But the driver is different, and so is the tell. Short squeezes show up in borrow rates and short interest. Gamma squeezes show up in call open interest and dealer gamma.
How they end
Badly, usually. The same mechanics run in reverse. Once the calls expire or the buying stops, dealers no longer need the hedge and sell the stock back. There is no natural holder underneath — the buying was never a bid for the company, it was a hedge. Prices retrace quickly and often violently.
Spotting the setup
Look for the structure rather than the story: heavy call open interest stacked just above spot, dealers in negative gamma, and aggressive call buying on the tape. That configuration means each move up forces more buying.
What it does not tell you is whether the move will start, or when. Plenty of ramps sit there and never trigger. Treat it as a map of where fuel is stored, not a prediction of ignition — and size for the fact that these unwind faster than they build.