Glossary term
Zomma
Zomma is an options Greek that measures how an option’s gamma changes when implied volatility changes.
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What Is Zomma?
Zomma is an options Greek that measures how an option's gamma changes when implied volatility changes. It is a higher-order risk measure, meaning it sits beyond the primary Greeks that most options traders watch first.
Gamma measures how delta changes when the underlying price moves. Vega measures how an option's value changes when implied volatility changes. Zomma connects those ideas by asking how sensitive gamma is to a change in volatility.
Key Takeaways
- Zomma measures the sensitivity of gamma to implied volatility.
- It is mainly used by advanced options traders, market makers, and risk managers.
- Zomma can matter when a portfolio has concentrated gamma exposure and volatility shifts quickly.
- It is not a basic suitability measure for ordinary options decisions.
Where It Fits Among Greeks
Greek | Primary Question |
|---|---|
Delta | How much does option value change when the underlying moves? |
Gamma | How much does delta change when the underlying moves? |
Vega | How much does option value change when implied volatility moves? |
Zomma | How much does gamma change when implied volatility moves? |
How It Is Used
Zomma is most relevant for portfolios where gamma exposure is important. If implied volatility changes, the portfolio's gamma can change too, which can alter hedge behavior and directional sensitivity.
This can matter near expiration, around large price moves, or in markets where implied volatility shifts abruptly. A trader managing only a simple long call or long put may not need to calculate zomma directly, but a desk managing many options positions may care about it.
Practical Limits
Zomma is model-dependent. It changes with assumptions about volatility, time, interest rates, dividends, and pricing model structure. It also tends to be less intuitive than delta, gamma, theta, or vega.
That makes it useful for specialized risk management, but easy to misuse if treated as a standalone trading signal. It should be read as part of a broader options-risk picture.
The Bottom Line
Zomma measures the volatility sensitivity of gamma. It is a specialized options-risk metric that helps explain how a portfolio's directional convexity may change when implied volatility moves.