Define: Vega

UK Accounting Glossary

Definition: Vega

Quick Summary of Vega

A measure of the sensitivity (rate of change) of an option’s price to the change in the price of the underlying asset.

What is the dictionary definition of Vega?

Dictionary Definition

  1. finance A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying product.
  2. Latin America, Philippines An open tract of ground; a plain, especially one which is moist and fertile, such as those used for growing tobacco.


Full Definition of Vega

The vega of a derivative shows how the value of the derivative changes in respect to a one per cent change in the implied volatility of the underlying. Vega is expressed in dollars. When buying or selling an option, a change in implied volatility means that the option price must be increased (i.e. by the vega amount for each 1% increase) or decreased (i.e. by the vega amount for each 1% decrease) in order to accommodate for a new volatility sensitivity. For example, ABC Inc. is trading at $37 in May and a June 40 call is selling for $3. Assume the underlying volatility is 20% and the vega is $0.35. If the underlying volatility increased by 1% to 21%, the trader will need to increase its option price by the vega amount to $3.35 (i.e. $3 + 0.35) to compensate for the change in volatility. As the option approaches its expiration date the vega of the option will decrease because any volatility changes in the underlying will have a relatively smaller time to influence the price of the underlying asset. The vega is also at its highest when the underlying is equal to the strike price of the option. As the price of the underlying asset deviates further away from the point where no gain or loss would occur, the vega drops. The vega drops because as the underlying moves away from the strike price, it becomes less likely that increased volatility will substantially alter the payoff of the option.


Cite Term

To help you cite our definitions in your bibliography, here is the proper citation layout for the three major formatting styles, with all of the relevant information filled in.

Page URL
Modern Language Association (MLA):
Vega. Payroll & Accounting Heaven Ltd. March 28, 2020
Chicago Manual of Style (CMS):
Vega. Payroll & Accounting Heaven Ltd. (accessed: March 28, 2020).
American Psychological Association (APA):
Vega. Retrieved March 28, 2020, from website:

Definition Sources

Definitions for Vega are sourced/syndicated and enhanced from:

  • A Dictionary of Economics (Oxford Quick Reference)
  • Oxford Dictionary Of Accounting
  • Oxford Dictionary Of Business & Management

This glossary post was last updated: 6th January 2020.