Commodity ETFs explained: oil, metals and the futures twist
You can’t exactly keep a barrel of oil in your garage — so how does a commodity ETF give you exposure to it? The answer, futures contracts, is also why these funds behave in a slightly surprising way.
What counts as a commodity
Commodities are the raw materials the world runs on, usually grouped into three buckets: energy (crude oil, natural gas), metals (copper, aluminium, plus precious metals like gold and silver) and agriculture (wheat, corn, coffee, sugar). A broad commodity ETF spreads across many of these at once; a narrow one might track just oil, or just industrial metals. The pitch is exposure to ‘stuff’ — an economy’s inputs — rather than to companies.
The futures twist
Here’s the part that catches people out. A fund can’t sensibly store tankers of oil or silos of wheat, so instead of the physical goods it mostly holds futures — contracts to buy the commodity at a set price on a future date. As each contract nears its date, the fund ‘rolls’ into the next one. Depending on prices, that rolling can quietly add to or subtract from returns, which is why a commodity fund’s performance can drift away from the spot price (today’s price) you see quoted on the news. (Precious metals are the exception — those are often held physically, as with a gold ETC.)
No income, big swings
Commodities share gold’s core trait: they pay no income. A barrel of oil never sends you a dividend, so the entire return is the price moving — and commodity prices are famously jumpy, driven by weather, wars, supply shocks and the economic cycle. That volatility, plus the futures quirk, makes broad commodities one of the more advanced corners of the ETF shelf, not a beginner’s starting point.
Why anyone bothers
The main appeal is diversification: commodities often move to a different beat than shares and bonds, and they can hold up when inflation is rising, since they’re the very things getting more expensive. So a small slice can, for some, smooth the overall ride. But given the swings, the lack of income and the futures complications, most beginners meet commodities as an optional, minor tilt — if at all. This explains how the tool behaves; it isn’t a recommendation to hold one.