Glossary term
Variance Swap
A variance swap is an over-the-counter derivative that pays based on realized variance versus an agreed variance strike.
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What Is a Variance Swap?
A variance swap is an over-the-counter derivative that pays based on the difference between realized variance and an agreed variance strike over a set period. It gives exposure to how much an underlying asset moves, not simply whether the asset rises or falls.
Variance swaps are typically used by institutional investors, hedge funds, dealers, and sophisticated risk managers. They are not ordinary retail investment products.
Key Takeaways
- A variance swap is a derivative tied to realized variance.
- It is related to volatility exposure but pays on variance, which is volatility squared.
- The buyer benefits when realized variance exceeds the agreed strike, before costs and terms.
- The contract is usually traded over the counter rather than on an exchange.
- Pricing, liquidity, collateral, counterparty risk, and path dependency can be complex.
How a Variance Swap Works
The parties agree on an underlying asset, measurement period, variance strike, notional amount, observation method, and settlement terms. At expiration, realized variance is calculated from the underlying asset's price movements during the period.
If realized variance is above the strike, the long variance party generally receives a payment. If realized variance is below the strike, the long variance party generally pays. The payoff depends on the contract terms and notional structure.
Variance Swap Compared With Related Exposures
Instrument | Primary Exposure | Common User |
|---|---|---|
Option | Direction, volatility, time, and strike exposure | Investors and traders |
Volatility swap | Realized volatility | Institutional volatility traders |
Variance swap | Realized variance | Institutional investors, dealers, hedge funds |
Risk Management Context
Variance swaps can be used to hedge or express a view on volatility. An investor worried that market turbulence will rise may want long variance exposure. A dealer or fund may use the contract to manage option-book risk or isolate volatility exposure from directional exposure.
The instrument can be sensitive to large price moves because variance squares returns. That means extreme moves can have a disproportionate effect on the payoff. Contract caps, collateral terms, and valuation models matter.
This convexity is one reason variance swaps are handled by specialized desks. A position that looks manageable in ordinary markets can change quickly when volatility spikes, liquidity thins, or the underlying asset gaps sharply.
What Makes It Complex
Variance swaps require careful definition of realized variance, observation frequency, holidays, corporate actions, disruption events, and settlement. Counterparty credit risk is also relevant because the contract is bilateral.
The term should not be treated as interchangeable with buying options or the VIX. Options contain multiple exposures, and volatility indexes use specific methodologies. A variance swap is a contract with its own payoff mechanics and documentation.
The Bottom Line
A variance swap is a sophisticated OTC derivative tied to realized variance. It can isolate volatility-related exposure, but its payoff, documentation, counterparty risk, and sensitivity to extreme moves make it an institutional-level instrument.