Vomma —

Quick answer: Vomma measures how much an option's Vega changes when implied volatility moves — the convexity of your volatility exposure, which makes long-Vega positions gain Vega as volatility rises.

Simple explanation

Vega tells you how sensitive an option is to volatility; Vomma tells you how that sensitivity itself changes as volatility moves. It means volatility risk is not linear: when IV spikes, a long-Vega position gets even more sensitive to volatility, accelerating gains. Vomma is largest for out-of-the-money options and matters most in volatile, skew-heavy markets.

Vomma — visual

Detailed explanation

The convexity of volatility

Vomma is the second derivative of the option price with respect to volatility — the rate of change of Vega as IV moves. Just as Gamma gives price exposure favourable curvature, Vomma gives volatility exposure curvature. A position with positive Vomma sees its Vega grow as IV rises, so it profits from volatility at an accelerating rate — and loses more slowly as IV falls. This is 'volatility of volatility' exposure.

Why OTM options carry the most Vomma

At-the-money options have high Vega but low Vomma — their volatility sensitivity is large but stable. Out-of-the-money options have lower Vega but high Vomma: as IV rises, their probability of coming into play jumps, so their Vega increases sharply. This is why OTM wings behave explosively when India VIX spikes, and why long-wing structures can pay off dramatically in a volatility event.

Vomma in volatility trading

Traders who want to be long a big volatility expansion — not just a small one — seek positive Vomma, often by holding OTM options or specific spread structures. When a shock hits and IV gaps up, positive-Vomma positions gain Vega and compound the move. Conversely, sellers of OTM options are short Vomma and can be hurt badly when a calm market suddenly becomes volatile.

Relevance to Indian event risk

Around large, uncertain catalysts — election results, global shocks, sharp Bank Nifty selloffs — implied volatility can move violently. Vomma determines whether your volatility exposure accelerates or fades during that move. Long-Vomma structures are a way to position for a volatility explosion, while naked OTM sellers must respect the short-Vomma tail they are carrying.

Formula

Practical example (Nifty)

Practical trading impact

• Vomma makes volatility exposure non-linear: long-Vega positions gain Vega as IV rises, accelerating profits.
• Out-of-the-money options carry the most Vomma — they behave explosively when India VIX spikes.
• Positive Vomma is a way to position for a large volatility expansion, not just a small one.
• Sellers of OTM options are short Vomma and face accelerating losses if a calm market turns volatile.

Common mistakes

• Selling far-OTM options for small premium while ignoring the short-Vomma tail that explodes in a volatility shock.
• Estimating volatility P&L linearly with Vega alone, missing the acceleration Vomma adds in a big IV move.
• Assuming ATM options give the most volatility convexity — they have high Vega but low Vomma; the wings hold the Vomma.
• Confusing Vomma (Vega vs volatility) with Vanna (Delta vs volatility) — both are volatility cross-Greeks but measure different things.

Professional usage

Volatility specialists think in Vega and Vomma together: they know ATM options give stable Vega while OTM wings give convex, accelerating Vega, and they build long-Vomma structures when positioning for a volatility explosion around major Indian catalysts. They also respect the short-Vomma risk embedded in selling cheap wings, sizing it as a genuine tail exposure rather than free premium.

Frequently asked questions

Sources & references

• Zerodha Varsity — Volatility
• NSE India — India VIX

Last reviewed 7 July 2026. Educational content only — not investment advice.