Commodity ETF
A commodity ETF is an exchange-traded fund that provides exposure to raw materials — such as gold, silver, oil, natural gas, or agricultural products — either by holding the physical commodity directly, by investing in commodity futures contracts, or by holding shares of commodity-related companies.
Commodity ETFs give U.S. investors a straightforward mechanism to gain exposure to raw material prices without opening a futures account or taking physical delivery of a commodity. The structure of the ETF, however, has a large impact on what investors actually receive, and the three primary structures — physical, futures-based, and equity-based — deliver meaningfully different performance characteristics.
Physical commodity ETFs hold the actual underlying commodity in a vault or warehouse. The most prominent examples are gold ETFs such as SPDR Gold Shares (GLD) and iShares Gold Trust (IAU), which each hold London Good Delivery gold bars in custodial vaults. The ETF share price tracks the spot price of gold minus a small annual custody and management fee. Physical ETFs are available for silver, platinum, and palladium as well. Because they hold the actual metal, their returns correspond closely to spot price movements, though the IRS taxes gains from precious metal ETFs as collectibles rather than long-term capital gains for individuals, applying a maximum 28 percent rate regardless of holding period.
Futures-based commodity ETFs — used for oil, natural gas, agricultural commodities, and others that cannot practically be stored — invest in commodity futures contracts rather than the physical good. These ETFs must continuously roll expiring contracts into new ones to maintain exposure. The roll process creates return dynamics that diverge from spot commodity prices based on the futures curve structure. When futures contracts for delivery further in the future trade at higher prices than near-term contracts — a condition called contango — the roll generates a cost that drags returns below spot price changes. When the opposite condition, backwardation, prevails, rolling futures can add return. The United States Oil Fund (USO) is a well-known example of a futures-based commodity ETF that experienced significant contango-driven performance divergence from the spot oil price, particularly during the 2020 oil market dislocation.
Equity-based commodity ETFs hold shares of companies involved in commodity production — mining stocks, oil and gas producers, agricultural companies, and similar businesses. These funds provide indirect commodity exposure blended with equity-specific factors including management quality, capital allocation, leverage, and production costs. They can outperform or underperform the underlying commodity significantly depending on operating leverage and company-specific factors.
Commodity ETFs are often used in portfolio construction as an inflation hedge, a source of diversification relative to stocks and bonds, or a tactical vehicle for expressing views on supply and demand dynamics in specific commodity markets. The correlation of commodity returns to equity and bond returns varies significantly across commodity types and time periods, making the diversification benefits context-dependent.