Gamma Squeezes Explained: Mechanics of Rapid Price Accelerations

A gamma squeeze begins when a surge of investors—often retail traders coordinated through social media or large institutional “whales”—begin buying out-of-the-money (OTM) call options in massive quantities.

A call option gives the buyer the right to purchase a stock at a specific price (the strike). If a trader buys a call with a strike price of $150 while the stock is at $100, that option is “out of the money” and relatively cheap. However, if thousands of traders buy these $150 calls simultaneously, it creates a massive liability for the people selling those contracts: the market makers.

Market makers are the firms that provide liquidity to the exchanges. When you buy an option, they are usually the ones selling it to you. They do not want to “bet” against you; they want to remain market-neutral and earn a small fee from the spread. To stay neutral, they must perform Delta Hedging.

To understand the squeeze, you must understand two “Greeks” used in options pricing:

• Delta: This measures how much an option’s price changes for every $1 move in the underlying stock. A delta of 0.10 means the option acts like 10 shares of stock.

• Gamma: This measures the rate of change of Delta [2]. It represents how much more “sensitive” the option becomes as the stock price approaches the strike price.

The Feedback Loop

1. Initial Purchase: A trader buys a call option from a market maker.
2. Initial Hedge: The market maker, now “short” the call, buys a small amount of the underlying stock to hedge their risk.
3. Price Rises: As more people buy calls, market makers buy more stock. This buying pressure pushes the stock price up.
4. Gamma Conversion: As the stock price moves closer to the strike price of those options, the Delta of the options increases rapidly (due to Gamma).
5. Forced Buying: Because the Delta is now higher, the market maker’s previous hedge is no longer sufficient. They are mathematically forced to buy even more shares to stay neutral [3].

This creates a “squeeze.” The higher the stock goes, the more shares the market makers must buy, which in turn pushes the stock even higher. During these periods of extreme volatility, mastering the core mechanics of a winning trade becomes essential, as the window for profit can close in minutes.

The most famous modern example of a gamma squeeze occurred in January 2021 with GameStop (GME). While often described solely as a “short squeeze,” data shows that a significant portion of the upward move was a gamma squeeze driven by a massive influx of weekly call options.

Another prominent case was AMC Entertainment in May 2021 [4]. The stock price surged over 1,000% in a single week. Retail traders purchased hundreds of thousands of “otto” (out-of-the-money) calls, forcing market makers to purchase millions of shares of AMC stock to hedge their surging Delta exposure.

More recently, large-scale investors have used this tactic on “Magnificent Seven” stocks. For example, some traders use bullish call spreads on high-beta tech stocks to trigger dealer buying. Conversely, traders expecting a downside move often look at TSLZ stock as a tactical tool for bearish plays when the “squeeze” energy finally dissipates.

While they often happen at the same time, they are distinct mechanisms:

A gamma squeeze is essentially a high-pressure system. It eventually loses steam for three reasons: 1. Profit Taking: Traders begin selling their call options, forcing market makers to sell the shares they previously bought as a hedge. 2. Expiration: When the options expire (usually on a Friday), market makers no longer need to hold the hedged shares and will dump them back onto the market. 3. Absence of New Buyers: If call buying volume slows down, the Delta stops increasing, and the “forced buying” from market makers ceases.

This often leads to a “crash” just as rapid as the ascent, as the hedging process works in reverse [1].

• Mechanics: A gamma squeeze is a price spike caused by market makers buying shares to hedge the risk of call options they sold.

• Driver: It is fueled by gamma—the rate at which an option’s sensitivity to price increases as the stock moves toward the strike price.

• The Loop: Buying calls -> Dealer buys stock -> Price rises -> Option Delta rises -> Dealer buys more stock.

• Volatility: These events provide extreme liquidity and price movement but are prone to “mean reversion” or sharp crashes once the options expire or buying slows.

Action Plan for Traders

1. Monitor Option Flow: Use tools to track unusual “call-to-put” ratios. A surge in OTM call buying is the primary warning sign.
2. Check Open Interest: High open interest in short-dated (weekly) options increases the likelihood of a gamma-related move.
3. Avoid “Chasing”: Entering a gamma squeeze at the peak is highly dangerous. Look for the initial spike in volume rather than the tail end of the move.
4. Set Tight Stops: Because the “unwinding” of a gamma squeeze is a rapid sell-off by market makers, use trailing stops to protect gains.

Final Thought: A gamma squeeze is a testament to the power of derivatives over the underlying market. While fundamental value determines a stock’s long-term price, in the short term, the mathematical requirements of market makers can override every other rule of finance.