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Is Vega Positive or Negative for a Long Option Position?

Vega is positive for a long option position (buying a call or put). A positive Vega means that if implied volatility increases, the option's premium will also increase, which benefits the buyer.

Option buyers are long volatility.

What Is ‘Negative Slippage’ and How Does It Differ from ‘Positive Slippage’?
How Does the Signed Integer Type Change the Definition of Overflow/underflow?
What Is Vega and How Does It Measure an Option’s Sensitivity to Volatility Changes?
What Is the Difference between Positive and Negative Slippage?