Vega
The rate of change in an option's price for a 1% change in implied volatility. Higher for longer-dated options.
Visual Example
Vega by Days to Expiration
Vega measures sensitivity to IV changes. Longer-dated options have higher vega - they're more affected by IV swings.
SPY example data from January 2025 · For educational purposes only
Vega measures how sensitive an option's price is to changes in implied volatility. A vega of 0.10 means the option price will increase by $0.10 for every 1% increase in IV.
Why Vega Matters
Unlike the other Greeks, vega isn't derived from the underlying's price movement. Instead, it reflects pure volatility exposure. This makes it crucial for:
- Volatility trading: Buying options when IV is low and selling when high
- Earnings plays: Understanding how IV crush affects your position
- Long-dated positions: LEAPS have high vega, making them sensitive to IV changes
Vega Characteristics
- Highest at ATM: Vega peaks when the option is at-the-money
- Increases with time: Longer DTE means higher vega
- Always positive for long options: Both calls and puts gain value when IV rises
- Decays near expiration: Short-dated options have minimal vega
Practical Application
When buying options before earnings, you're paying for elevated IV (high vega exposure). After earnings, IV typically collapses, reducing option value regardless of price direction. Understanding vega helps you avoid these "IV crush" surprises.
For premium sellers, high vega means you're collecting more premium when IV is elevated - a favorable setup for income strategies.
See it in Action
Vega is part of the Value pillar in our 5-pillar scoring system.
Related Terms
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