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The case for a broad commodities strategic allocation

A broad commodity allocation may help diversify a multi-asset portfolio, add inflation sensitivity, and has less concentration risk than a single-commodity allocation. State Street Investment Management has launched an ETF designed to deliver this exposure efficiently.

24 April 2026 4 min read

Ryan Reardon

Senior Equity ETF Strategist

A direct commodity investment—such as a standalone allocation to gold or crude oil—can offer investors a significant tactical option. But single commodity exposures can also expose portfolios to severe idiosyncratic risks and structural inefficiencies. To truly capture the benefits of the asset class, investors could consider an optimised broad commodity strategy. S&P Global’s Dow Jones Commodity Index (DJCI) 3 Month Forward - Quarterly Reweight Index may offer investors a strategic opportunity to complement their core allocations in a multi-asset portfolio with a risk-adjusted broad commodities approach.

Why commodities can play a strategic portfolio role

A strategic commodity allocation can complement core equity and fixed income holdings in three ways: by adding diversification, by offering a potential hedge against inflation, and by providing exposure to shifting supply and demand dynamics through the business cycle.

Diversification: Commodities are structurally distinct from stocks and bonds. The price of a commodity is driven by physical supply and demand dynamics such as global weather patterns, supply chain bottlenecks, and geopolitical events. This is in contrast with the discounted cash flow models used for equities and bonds, which are determined by earnings growth and distribution. Commodities have historically not moved in lockstep with stocks and bonds, which may help provide diversification when traditional asset classes face macro headwinds.
Inflation hedge: Commodities are a foundational component of the global economy. They do not merely react to inflation—they are often the direct source of it. In environments of unexpected inflation or stagflation, traditional equity-bond correlations often turn positive—meaning both asset class valuations fall in tandem. Commodities are one of the few asset classes that historically exhibit a positive beta to inflation surprises—a valuable quality when traditional assets are under pressure.
Commodity supercycle: We are currently navigating a macro environment characterised as a commodity supercycle. Years of underinvestment in capital expenditures for fossil fuels and mining, paired with structurally constrained supply chains, have severely limited global output. Simultaneously, there has been a significant increase in the demand for raw materials used in new technologies. Hardware related to AI and energy transition innovations require immense volumes of copper, aluminum, and rare earth metals. Demand is largely inelastic, so new supply sources can take years or decades to bring online. This structural imbalance could create compelling return opportunities in the underlying commodities.

Index construction matters in broad commodity exposures

Investors seeking to systematically address the flaws of traditional narrow commodity investing should consider the Dow Jones (DJCI) 3 Month Forward - Quarterly Reweight Index. Based on back-tested data, this broad commodities index showed increased diversification and strong back-tested performance compared to other indices since 2014.¹ As of its January 2026 reconstitution, it holds 29 commodities across three equal-weighted sectors, agriculture/livestock, energy, and precious/industrial metals. Unlike other indices which gain exposure by holding the front-month futures contract, this index holds 3-month forward contracts to help mitigate front-month volatility from near-term demand or geopolitical disruptions.

Figure 2: Index Overview
Index Methodology	Dow Jones Commodity Index (DJCI) 3 Month Forward - Quarterly Reweight
Approach	The Dow Jones Commodity Index is a broad measure of the commodity futures market that emphasizes diversification and liquidity through a simple, straightforward, equal-weighted approach.
Ticker	DJCI3MQT
Commodity Components	29
Sectors	3 – agriculture and livestock, metals, energy
Weighting Method	Liquidity weighted, equal weight across sectors, 32/17 capped component
Rebalancing Frequency	Annually in January
Reweight Frequency	Quarterly
Roll Frequency	Monthly
Launch Date	22 August 2025
UCITS Caps	Yes
The Dow Jones Commodity Index (DJCI) 3 Month Forward - Quarterly Reweight was incepted on 22 August 2025. Results prior to this date were calculated by using available data at the time in accordance with the Index’s current methodology. Source: S&P Dow Jones Indices LLC, as of 31 March 2026. For illustrative purposes only.

Sector equal weighting: Single commodities can carry extreme concentration risk. For instance, oil is very sensitive to unpredictable OPEC+ production decisions, while gold can be sharply affected by moves in real rates or geopolitical shocks. Broad commodity indices are not a new concept and indices were launched as far back as 1991, but older production-weighted methodologies can result in heavy concentration risk, where energy can be a very large part of the index composition. The DJCI methodology is designed to address this by being liquidity-weighted and equally weighting the three major commodity sectors: energy, agriculture and livestock, and metals. This sector approach helps promote balance in the portfolio. Investors can capture the upside of industrial metals during an economic boom or agricultural price rises during weather crises, without being overly exposed to crude oil volatility.
Mitigating contango with the forward roll: One of the key risks to investing in commodities through futures is negative "roll yield" caused by a market in contango—where the future prices of contracts are higher than today’s spot price. In a traditional commodity index approach, which holds the latest front-month contract, rolling an expiring contract into the subsequent higher-priced contract is effectively forcing investors to buy high and sell low. The steepest part of a contango curve typically exists at the very front. By systematically executing a 3-month forward roll, the DJCI index can often position itself further out to a flatter portion of the futures curve. This strategic placement helps investors avoid the significant front-month negative roll, lowers the cost of carry and can potentially improve long-term returns.
Dynamic quarterly reweight: Commodity markets are exceptionally volatile, which challenges investors seeking a balanced portfolio risk/return profile. Since target weights in a broad commodity index can drift rapidly, a disciplined rebalancing schedule can help investors make a strategic allocation to commodities which aligns with their portfolio objectives. A dynamic quarterly reweight is frequent enough to capture the rebalancing premium—systematically trimming winners and adding to laggards to enforce the equal-sector mandate and harvest mean reversion—while being slow enough to let short-term momentum run and keep transaction costs manageable.
Relancing cadence, a yearly adjustment may be too slow. It forces the portfolio to sit on significant over- or under-allocations for months and can result in unnecessary risk by failing to react to rapid macro shifts. But a monthly or continuous rebalancing can result in excessive trading friction. The constant buying and selling of futures contracts will increase transaction costs, which acts as a permanent drag on net performance.

Why access broad commodities through an ETF?

For investors seeking diversified commodity exposure, an ETF can offer a practical implementation route: broad access in a single trade, transparent daily holdings, and intraday liquidity across both primary and secondary exchange channels. As with any ETF, the key consideration is the index methodology or strategy underneath it, and whether it delivers the intended exposure.

Learn more about commodity ETFs, or read about our new broad commodities ETF:

Footnotes

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