Risk parity
What is Risk parity?
Risk parity is a portfolio approach that seeks to balance contributions to overall risk across assets or portfolio sleeves rather than allocating equal amounts of capital.
Why it matters
Traditional balanced portfolios often hold more capital in bonds but derive most volatility from equities. Risk parity attempts to diversify the sources of risk more evenly. The approach focuses on how assets interact, aiming to prevent one volatile sleeve from dominating total portfolio behavior despite appearing moderate by capital weight.
How it works
A covariance model estimates each asset's marginal contribution to portfolio risk. Weights are chosen so specified sleeves contribute similar or otherwise budgeted amounts. Lower-volatility assets often receive larger capital weights. Some strategies use leverage to raise the expected return of the resulting lower-volatility portfolio to a desired level.
Example
Suppose equities are much more volatile than government bonds. An equal capital allocation would still be equity-risk dominated. A risk-parity allocation might hold substantially more bonds and fewer equities so their modeled contributions are closer. If leverage is permitted, bond exposure may be increased further through borrowing or derivatives.
How to interpret it
Risk parity does not mean every asset has the same weight or return forecast. Results depend on the definition of risk, the assets included, the estimation window, and whether leverage is used. Evaluate realized risk contributions, drawdowns, financing costs, interest-rate exposure, and behavior during inflation or liquidity shocks.
Limitations
Historical volatility and correlations can change sharply. Large bond allocations may create substantial duration exposure, and leverage adds financing, liquidity, and deleveraging risks. Equalizing modeled risk does not ensure equal economic risk or prevent losses. The method can also underweight assets with attractive expected returns merely because their measured volatility is high.
Practical checklist
Review unlevered and levered exposures separately, including financing terms, collateral, derivative counterparties, and liquidity under stress. Decompose risk by asset and economic factor rather than accepting a single equal-contribution output. Test inflation, rate shocks, equity crashes, and simultaneous deleveraging. Compare the strategy with a simpler diversified portfolio after fees and financing. Risk parity should be evaluated as a complete implementation, not merely as a set of model weights.
Also known as: equal risk contribution