Hedge Ratio
The hedge ratio is a quantitative measure used to determine the appropriate amount of an underlying asset required to hedge a derivative position. It is typically derived from the delta of the option, which indicates the sensitivity of the option price to the underlying asset price.
For example, if an option has a delta of 0.5, a trader might need to short 0.5 units of the underlying for every long option contract held. The ratio is dynamic and must be updated as the underlying price, time to expiration, and volatility change.
Accurate calculation of the hedge ratio is fundamental to maintaining a delta-neutral portfolio and minimizing directional risk. In volatile markets, frequent adjustments to the hedge ratio are necessary to keep the portfolio risk within acceptable limits.
It is a critical tool for professional risk managers to ensure that their derivative exposures are properly protected.