A delta neutral portfolio is a strategic construction of assets and derivatives designed to eliminate directional exposure to the underlying asset’s price movements. This portfolio structure aims to profit from other factors, such as time decay (theta) or changes in volatility (vega), rather than from a specific upward or downward trend in the asset price. The portfolio’s delta, which measures price sensitivity, is maintained at or near zero through continuous rebalancing.
Hedge
Achieving delta neutrality requires precise hedging, typically by combining long and short positions in the underlying asset with corresponding options contracts. For example, selling a call option with a positive delta can be offset by shorting a portion of the underlying asset. This dynamic hedging process ensures that the portfolio’s value remains stable even as the underlying asset price fluctuates within a defined range.
Risk
While delta neutrality mitigates directional risk, it introduces other forms of exposure, primarily gamma risk and vega risk. Gamma measures how quickly the delta changes, requiring frequent adjustments to maintain neutrality, which incurs transaction costs. Vega measures sensitivity to volatility changes, meaning the portfolio can still lose value if implied volatility shifts significantly, even if the underlying price remains stable.
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