Risk Budgeting
Risk budgeting is a portfolio construction framework that allocates a defined total risk capacity — measured in volatility, CVaR, or another risk metric — across assets, strategies, or factor exposures, ensuring that each allocation is intentional and that the aggregate portfolio stays within acceptable risk bounds.
Traditional portfolio construction often focuses on dollar allocation: put 60% in equities and 40% in bonds. Risk budgeting reframes the question: how much of the total portfolio risk is each component contributing? Because asset classes have very different volatility levels, a 60/40 dollar split is often closer to an 85/15 risk split — most of the portfolio risk comes from equities, leaving the bond allocation as a diversifier with limited standalone contribution.
The risk parity approach, popularized by Ray Dalio at Bridgewater Associates and later implemented by firms like AQR Capital, is the most prominent application of risk budgeting. Risk parity portfolios allocate capital such that each asset class contributes equally to total portfolio risk. Because bonds are less volatile than equities, this typically requires using leverage on the bond allocation and reducing the equity allocation — resulting in a portfolio that behaves very differently from a traditional 60/40 fund, particularly in interest rate-sensitive environments.
Risk budgeting does not require equal risk allocation across all positions. A manager might deliberately allocate 40% of the risk budget to a high-conviction equity factor, 30% to rates exposure, and 30% to diversifying alternative risk premia. The discipline is that every risk allocation is conscious and sized relative to expected contribution to return and to the total risk budget. Positions that consume risk budget without proportional expected return are reduced or eliminated.
Risk budgets are typically defined and monitored at multiple levels: total portfolio volatility target, allocation-level CVaR limits, factor exposure limits (e.g., maximum beta to the S&P 500, maximum duration), and liquidity risk measures. Breaching a risk budget level triggers a review and often a reduction in the offending exposure — not necessarily a belief that the position is wrong, but a discipline that the total risk taken must remain within pre-agreed bounds.
For institutional investors, risk budgeting frameworks form part of the Investment Policy Statement (IPS) that governs how the fund is managed. The IPS specifies the total risk budget, how it is allocated across asset classes or managers, and the process for rebalancing when allocations drift. Transparent risk budgeting is increasingly a governance expectation for endowments, pension funds, and sovereign wealth funds.