What are the limitations of beta hedging for equity portfolios?

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AcadiFi · Accepted Answer

Beta hedging works well for first-order systematic exposure in normal markets but fails in several important scenarios. First, beta is unstable - a portfolio beta estimated from 2-year monthly data might be 1.15, but realized beta during a crash could jump to 1.70 as dispersion compresses. Your static hedge is undersized exactly when you need it most. Second, beta captures only one factor. A small-cap value tilt has beta 1.0 to SPX but exposure to size and value factors that SPX doesn't hedge. During Q1 2021 growth selloff, value-tilted books lost money while SPX was flat - beta hedge was worthless. Third, basis risk between portfolio holdings and hedge instrument. Hedging a portfolio of 40 mid-cap names with ES futures leaves residual dispersion risk. A March 2020 scenario showed ES down 30% while mid-caps down 42% - beta hedge captured the 30% but the 12-point gap was unhedged. Fourth, nonlinearities from options. A short-vol book has negative gamma that beta doesn't see. Use delta-adjusted beta, regime-conditional hedges, or multifactor hedges via ETFs (RTY for small cap, IWD for value) for better coverage. ```mermaid graph TD A[Static beta
hedge] --> B[Breaks in
stress] A --> C[Misses
factor tilts] A --> D[Basis
risk] ```

What are the limitations of beta hedging for equity portfolios?

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