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A rainbow option is a multi-asset exotic whose payoff depends on the relative performance of two or more underlying assets. Common variants include best-of options (paying the maximum return among assets) and worst-of options (paying the minimum).
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Key takeawayRainbow options price in correlation between assets. The seller of a worst-of option collects higher premium because the structure benefits from low correlation (more likely one asset underperforms). This mirrors how premium sellers diversify across uncorrelated underlyings.
💡 Why It Matters
Rainbow options illustrate how correlation between assets affects option pricing. For premium sellers managing multi-asset portfolios, understanding correlation-driven pricing helps optimize position construction across correlated and uncorrelated names.
⚙ How It Works
A best-of rainbow call pays based on the highest-performing asset. A worst-of rainbow call pays based on the lowest-performing asset. Best-of options are expensive because diversification guarantees a good outcome. Worst-of options are cheap because only one asset needs to underperform.
📋 Example
A worst-of put option on AAPL/MSFT/GOOGL (correlation ~0.70) costs much less than three individual puts because only the worst performer determines the payoff. If correlation drops to 0.30, the worst-of option becomes much more expensive because the probability of at least one stock falling sharply increases.
⚠ Common Mistakes
Traders assume selling premium on a basket of correlated stocks provides diversification. Rainbow option math shows that worst-of (seller) risk increases as correlation decreases. If your short premium positions span uncorrelated names, you face more concentrated single-name risk, not less.
❓ FAQ
What is Rainbow Option?
A rainbow option is a multi-asset exotic whose payoff depends on the relative performance of two or more underlying assets. Common variants include best-of options (paying the maximum return among assets) and worst-of options (paying the minimum).
Why does Rainbow Option matter for premium sellers?
Rainbow options price in correlation between assets. The seller of a worst-of option collects higher premium because the structure benefits from low correlation (more likely one asset underperforms). This mirrors how premium sellers diversify across uncorrelated underlyings.
How does Rainbow Option work?
A best-of rainbow call pays based on the highest-performing asset. A worst-of rainbow call pays based on the lowest-performing asset. Best-of options are expensive because diversification guarantees a good outcome. Worst-of options are cheap because only one asset needs to underperform.
What are common mistakes with Rainbow Option?
Traders assume selling premium on a basket of correlated stocks provides diversification. Rainbow option math shows that worst-of (seller) risk increases as correlation decreases. If your short premium positions span uncorrelated names, you face more concentrated single-name risk, not less.
Related Terms
Asian Option
An exotic option whose payoff depends on the average price of the underlying over a specified period, not just the price at expiration.
Barrier Option
An exotic option that activates (knock-in) or deactivates (knock-out) when the underlying price hits a preset barrier level.
Basket Option
A basket option has a payoff determined by the weighted average price of multiple underlying assets rather than a single asset.
Bermuda Option
A Bermuda option can be exercised only on specific dates between the purchase date and expiration, not continuously like an American option or only at expira...
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