Oct 08, 2026 by Offer

Options Greeks: vega: Answer Guide 2027

Vega measures an option's sensitivity to changes in implied volatility — how much the option's price moves when expected volatility rises or falls by one point. Long options are long vega: they gain when volatility rises. In an options Greeks vega interview question, explain the vol exposure, where vega peaks, and the crush risk.

Vega Interview Questions: What They Test

The intuition: options are volatility instruments — higher expected volatility means a wider distribution of outcomes, which benefits the holder's asymmetric payoff. Vega is highest for at-the-money options with longer expirations, since distant uncertainty is where volatility assumptions matter most.

Interviewers want the practical scenarios. Buying options before earnings means paying inflated implied volatility — after the announcement, vol "crushes" and the option can lose value even if the stock moves your way. Long-dated options (LEAPS) are essentially vega plays. And the vol surface matters: vega assumes parallel shifts, but real vol moves are rarely parallel across strikes and expiries.

How to Answer a Vega Interview Question

Define it. "Vega is price sensitivity to implied volatility — long options gain when expected vol rises."
Say where it peaks. "At-the-money, longer-dated options — where volatility assumptions drive the most value."
Give the crush example. "Buy pre-earnings options at 80% implied vol; post-announcement vol collapses to 30% — the option bleeds even on a favorable move."
Note the limitation. "Vega assumes parallel vol shifts; real surfaces twist — vega is a first-order guide, not the full picture."

Common Mistakes in Vega Interview Answers

Confusing implied with realized vol. Vega responds to implied (expected) volatility — realized moves only matter through re-hedging (gamma).
Forgetting the earnings crush. The most common real-world vega lesson — always have this example ready.
Treating vega as constant. Vega itself changes with the underlying price and time — it is highest where uncertainty is greatest.

Vega turns options from directional bets into volatility bets — the crush example plus the definition is the interview answer.

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FAQ

Q: What is vega in options trading? A: The Greek measuring how much an option's price changes for a one-percentage-point change in implied volatility.

Q: Are option buyers long or short vega? A: Long — higher implied volatility increases option values, benefiting holders and hurting sellers.

Q: What is volatility crush? A: The sharp drop in implied volatility after a known event (like earnings), which can sink option prices even when the underlying moves favorably.

Q: Which options have the highest vega? A: At-the-money options with longer times to expiration, where volatility expectations contribute most to the price.

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