Vega (Options)

Vega quantifies how much an option's price changes for each 1 percentage point change in implied volatility. For example, an option with a vega of 0.15 will increase by $0.15 if implied volatility rises by 1%. Unlike delta and gamma, vega is not derived from the standard Black-Scholes variables — it is technically not a Greek letter, but is universally grouped with the Greeks. Vega is highest for at-the-money options and for options with more time until expiration, because these have the most extrinsic value sensitive to volatility changes. Long options (calls and puts) have positive vega, meaning they benefit from rising volatility, while short options have negative vega. This is why options are often described as volatility instruments. Traders use vega to construct volatility-neutral portfolios, trade volatility directionally through straddles and strangles, and manage risk during high-volatility events like earnings announcements. Understanding vega is crucial for distinguishing between directional and volatility-driven option strategies.