Vega
Vega measures how much an option's price changes for every 1% change in implied volatility. High vega means the option is very sensitive to volatility changes. Unlike other Greeks, vega isn't actually a Greek letter.
Understanding the Concept
• Longer-dated options have higher vega (more time for volatility to matter) • At-the-money options have the highest vega • Vega is positive for both calls and puts when you're long • Volatility crush after earnings can destroy option value via vega
Real-World Example
Your call option has a vega of 0.15. If implied volatility rises from 30% to 31%, your option gains $15 per contract (0.15 × 100 shares). After earnings, implied volatility often drops sharply (volatility crush), which can cause options to lose 20-30% of their value overnight even if the stock moves in your direction.
How Strykr Helps
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