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How to Interpret Gamma

Gamma measures how quickly an option’s delta changes as the underlying stock price moves. In this section, the chart compares the overall average gamma with the average gamma for call options and put options separately. Gamma is especially useful for understanding how sensitive options exposure may become during stock price moves.

Higher gamma means that delta can change more rapidly as the stock moves. This can make options exposure more dynamic and may increase the need for hedging adjustments by market participants. By separating call gamma and put gamma, the chart helps show whether this sensitivity is being driven more by call options, put options, or both.

• Rising average gamma suggests that the options market is becoming more sensitive to changes in the underlying stock price. This can occur when options are closer to the current stock price, when near-term expirations dominate, or when trading activity increases in contracts with high convexity.
• Falling average gamma suggests that options exposure may be becoming less sensitive to stock price changes. This may happen as options move further in or out of the money, as high-gamma contracts expire, or as activity shifts to longer dated options.
• Call gamma above put gamma may indicate that call-side contracts are contributing more to price sensitivity. This can be relevant when the stock is moving higher or when traders are concentrated in calls near the current stock price.
• Put gamma above call gamma may indicate that put-side contracts are contributing more to price sensitivity. This can be relevant during downside moves, periods of increased hedging demand, or when protective puts are clustered near the current stock price.
• Gamma spikes are important because they may signal that small stock price movements could produce larger changes in options exposure. This does not predict direction by itself, but it may indicate that the stock is entering a more sensitive options environment.

When reading the gamma chart, look for periods where gamma rises sharply or where call and put gamma diverge. A broad increase in both call and put gamma may indicate that options sensitivity is increasing across the chain. A rise concentrated in calls or puts may suggest that one side of the options market is driving most of the change.

Gamma is often most informative when viewed around major events, sharp stock moves, earnings dates, or option expiration periods. Because gamma tends to be highest for near-the-money and near-expiration options, sudden changes may reflect shifts in the option chain rather than a simple change in investor sentiment.