Understanding Vega

Vega measures an option's sensitivity to changes in the **Implied Volatility (IV)** of the underlying asset. While Delta measures price sensitivity and Theta measures time sensitivity, Vega measures "fear and expectation" sensitivity.

If an option has a Vega of 0.10, it means that for every 1% change in Implied Volatility, the option's price will move by ₹0.10, regardless of the stock price.

This is the most common pitfall for new traders. Before a major news event (like quarterly earnings), IV is usually very high because traders expect a big move. This inflates the Time Value component of the option price.

Once the earnings are released, the uncertainty is gone, and IV collapses. This is called an IV Crush. Your option price can drop by 30-50% in minutes even if the stock price goes in your favor, simply because the "fear premium" (Vega) has been removed from the price.

• When to Buy: Look for low IV environments before a catalyst. You want to buy the "cheap" volatility and sell when it expands.
• When to Sell: Look for high IV environments (like pre-earnings). You are "selling" high volatility, and you win when IV shrinks.
• Beware: If you buy an option with high Vega, you are effectively betting that volatility will increase further. If it stays the same, the Theta decay will still eat your profits.