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The option's vega is a measure of the impact of changes in the underlying volatility on the option price. Vomma: The rate at which the vega of an option will react to volatility in the underlying market. Vega is the sensitivity of an option’s price to changes in the volatility of the underlying asset. The key parameter that determines the value of a contract is the volatility of the underlying asset. Related Terms: Greeks Click here for articles on vega. Vega values represent the change in an option’s price given a 1% move in implied volatility, all else equal. Within the Greeks, in particular, option volatility greeks, Vega’s importance rises given how misunderstood the behaviour of volatility is. When vega is large the security is sensitive to small changes in volatility. The rate of change in the price of a derivative security relative to the volatility of the underlying security. Miscellaneous Facts about Vega Vega is always positive, and, moreover, is the same value for puts as for calls; thus option prices always increase as the volatility does. Vega. Vega measures the sensitivity of the price of an option to a change by 1% of the volatility of the underlying asset. showing only Business & Finance definitions (show all 6 definitions) Note: We have 10 other definitions for VEGA in our Acronym Attic. The vega tends to decline closer to the expiry date of the contract. Vega definition is - the brightest star in the constellation Lyra. Vega is the greek metric that allows us to see our exposure to changes in implied volatility. It is the second order derivative of the option value with respect to volatility. Vega hedging . Unfortunately, this is a very difficult parameter to measure. Long options & spreads have positive vega. vega (Financial definition) iotafinance.com Nor … Vega for a portfolio is the sum of the vegas of its constituents. Specifically, the vega of an option expresses the change in the price of the option for every 1% change in underlying volatility. Example strategies with long vega exposure are calendar spreads & diagonal spreads. Of course, the vega of a short position is negative. Options tend to be more expensive when volatility is higher. See also Greeks. Main Page: investment, inventory, tax advisor, inventory control, business, finance, financial, credit, Definition of Vega. new search; suggest new definition; Search for VEGA in Online Dictionary Encyclopedia It is not necessary for the price of the underlying to change in order for the vega to change; only the expected volatility of the underlying needs to change. Vega is the change in the value of the option with respect to change in volatility. The prices and hedging strategies are only as good as the model for the underlying. The vega is calculated mathematically, and can be large in a new options contract. 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