Gamma Squeeze

A rapid, self-reinforcing stock price surge caused by options market makers buying underlying shares to hedge their growing delta exposure as call options move in the money.

A gamma squeeze occurs when unusually heavy call option buying forces market makers into a feedback loop of stock purchases that accelerates price moves to the upside. Market makers who sell calls must delta-hedge — they buy shares of the underlying to offset their short-call exposure. As the stock rises and those calls move closer to or further in the money, delta increases rapidly (gamma measures this acceleration), forcing market makers to buy even more shares. Each round of hedging pushes the stock higher, which triggers more hedging, creating a self-reinforcing spiral.

The mechanics require concentrated call buying in near-term, at-the-money strikes — the zone where gamma is highest. When retail traders or coordinated buyers pile into short-dated calls on a stock with limited float or high short interest, the hedging demand can overwhelm normal selling pressure. The GameStop and AMC episodes of early 2021 combined a gamma squeeze with a short squeeze: rising prices simultaneously forced options hedging buys and short-seller covering, amplifying the move dramatically.

Gamma squeezes typically unwind as sharply as they begin. Once the call buying stops or the expiration date passes, market makers reduce their hedge, selling shares they no longer need. Implied volatility often collapses simultaneously, crushing the remaining option value. Traders attempting to profit from a gamma squeeze face severe timing risk — entering late means buying into a spike that can reverse within hours.

This definition is for informational and educational purposes only. Nothing on Finance Compass constitutes financial, investment, or trading advice. Always conduct your own research and consult a qualified professional before making financial decisions.