“Stock prices can go to zero. Commodities cannot. Unlike shares in a company, commodities are real things that are always likely to be worth something to somebody.”
– Jim Rogers
While Rogers might have missed the fact that oil prices would turn negative in 2020 during the Covid crisis, the underlying idea remains valid. Even the biggest companies can go bankrupt overnight, but it’s very hard for a commodity with an actual use to drop to zero.
So, what is the easiest way to get exposure to commodities?
Well, if you want to own gold without a safe, or bet on the oil price without a tanker, you will almost certainly end up looking at an Exchange Traded Commodity (ETC).
ETCs trade like shares and track the price of a single commodity or a basket of them.
On screen, they look identical to an ETF. You buy it the same way, you sell it the same way, and the price moves with the metal or barrel just as you’d expect. But underneath, ETCs and ETFs are very different.
An ETF is a fund. An ETC is a debt security. That single legal difference shapes the diversification rules, the collateral, the risks and the reason ETCs exist in Europe in the first place.
In this guide, we will look at what an ETC actually is, how it is built, how it differs from a commodity ETF and from owning the commodity outright, and where it earns its place in an alternatives portfolio.
What an ETC Actually Is
Let’s start with the family tree. The umbrella term is the Exchange Traded Product (ETP) – anything that tracks an underlying asset and trades on an exchange like a share.
Beneath that umbrella sit three siblings:
- The ETF (Exchange Traded Fund)
- The ETN (Exchange Traded Note)
- The ETC (Exchange Traded Commodity)
An ETC is a debt security issued by a special purpose vehicle (SPV). When you buy an ETC, you are not buying a slice of a fund but you are holding the SPV’s promise to pay you a return linked to the commodity.
And here is the part that makes ETCs safer than the word “debt” suggests: that promise is collateralised. The commodity itself, or assets of equivalent value, backs the note, held by a trustee on behalf of investors.
The SPV is also deliberately built to be bankruptcy-remote, insulated from the financial health of the wider business that sponsors it.
This is the crucial line that separates an ETC from an ETN. An ETN is also a debt note, typically unsecured, issued off a bank’s balance sheet and backed only by that bank’s creditworthiness.
Why ETCs Exist At All
If ETFs already track almost everything, why does Europe need a separate wrapper for commodities?
The answer to this lies in a single regulation – UCITS, the European framework that governs most retail funds.
UCITS demands two things that single commodities cannot satisfy. First, a UCITS fund must be diversified. It cannot invest everything in a single asset. And second, a UCITS fund may not hold physical commodities directly.
Put those two rules together, and you get a problem. A fund that holds nothing but gold breaks the diversification rule and the no-physical-commodity rule at once. So a pure, single-commodity ETF is effectively impossible under UCITS.
The ETC was engineered precisely to step around this. As ETC is a note rather than a fund, the UCITS fund rules do not bind it the same way, and it can do the one thing a UCITS ETF cannot: give you clean, undiluted exposure to a single commodity like gold, silver or oil.
Two Kinds of ETC: Physical and Synthetic
There are two broad types of ETCs in the market:
- Physically-Backed ETCs
These ETCs hold the actual commodity. For example, a physical gold ETC owns real bullion in a secure vault, held by a custodian on the investors’ behalf.
The iShares Physical Gold ETC (SGLN), listed in London, is a textbook example. Every share is backed by allocated gold meeting London Bullion Market Association (LBMA) standards. Buy it, and you have, in effect, a claim on a specific quantity of vaulted metal.
Because the bars simply sit there, a physical ETC tracks the spot price closely, and the main running costs are storage and insurance. This model works cleanly for precious metals like gold, silver, platinum, and palladium.
- Synthetic (Futures-Based) ETCs
Now, try to store a year’s worth of crude oil, natural gas, or wheat. You cannot practically do it. For these, the ETC cannot hold the physical commodity, so it tracks the price through futures contracts instead, backed by cash or high-quality collateral.
A good example is the WisdomTree Brent Crude Oil ETC. It’s a fully collateralised, UCITS-eligible ETC that gives total-return exposure to Brent crude futures rather than to barrels in a tank.
This is where ETCs get interesting and where the unwary lose money because tracking a commodity through futures introduces a cost that has nothing to do with the commodity’s price.
The Hidden Cost: Roll Yield and Contango
A futures contract has an expiry date. So, an ETC that tracks oil via futures cannot simply hold a single contract forever. As each nears expiry, the issuer must sell it and buy a later-dated one to maintain exposure. This is called rolling.
The catch is that the later contract rarely costs the same as the one being sold. When longer-dated futures are more expensive than near-dated ones (a situation called contango), the issuer sells low and buys high every time it rolls, bleeding a little value on each turn. That drag is negative roll yield, and over time, it can pull the ETC well below the spot price it is meant to track. The opposite condition, backwardation, works in your favour.
The following worked example shows how large the effect can be.
Why a Futures ETC Can Lag Spot
Suppose oil spot sits at $80, and the ETC holds a one-month future.
The market is in contango: each month’s future costs about 1% more than the one expiring.
The issuer rolls monthly.
Now, even if spot oil ends the year exactly where it started, watch what the roll does:
Spot oil, start of year = $80
Spot oil, end of year = $80 (unchanged)
Monthly roll cost (contango) = 1% per roll
Rolls per year = 12
Approx. annual roll drag = (1.01)^12 – 1 = 12.7%
The price of oil did not move, but the ETC is down roughly 13% on the year, purely from rolling through a contangoed curve.
This is an honest reflection of what it actually costs to hold a commodity position through futures. But it is the single most misunderstood feature of commodity ETCs, and the reason a futures-based ETC is a poor tool for a long, passive hold.
The Other Cost: Expense Ratio
On top of any roll effect sits the ETC’s running charge – the Total Expense Ratio (TER). This is the annual percentage skimmed continuously from the product.
Commodity ETCs are not expensive by active-management standards, but the fee compounds, and on a long hold, it quietly matters.
Physical precious-metal ETCs tend to carry low expense ratios. The iShares Physical Gold ETC is among the cheaper options, while futures-based ETCs run a little higher. The WisdomTree Brent Crude Oil ETC carries a TER of 0.49% a year.
The drag is easy to see over time. Take £10,000 in an ETC charging 0.49%, and assume the underlying price is flat, to isolate the fee:
| Period (price flat, TER 0.49%) | Value of £10,000 |
|---|---|
| Start | £10,000 |
| After 1 year | £9,951 |
| After 5 years | £9,757 |
| After 10 years | £9,521 |
Roughly £480 has been lost over a decade, with the price doing nothing. The lesson here is not that the fee is high, but it is that the all-in cost of a commodity ETC is the TER plus any roll drag.
ETC vs ETF vs Owning the Commodity
The table below lays out three ways to get commodity exposure and three different trade-offs.
| ETC | Commodity ETF | Direct / Physical | |
|---|---|---|---|
| Legal form | Debt note (SPV) | Fund | You own the asset |
| Single commodity? | Yes | Rarely (UCITS limits) | Yes |
| Main risk | Issuer / counterparty | Tracking, fund risk | Storage, theft, spread |
| Holds physical? | Sometimes | No (UCITS) | Yes |
| Best for | Single-commodity bets | Diversified baskets | Long-term metal holders |
Commodity ETF plays to diversification. Because UCITS forces a fund to spread its holdings, a commodity ETF typically tracks a basket rather than the raw materials themselves. If you want one-click exposure to commodities as a whole, an ETF is the natural tool.
What it cannot easily do is give you pure, single-commodity exposure. That is the ETC’s job.
Owning the commodity directly removes issuer and counterparty risk entirely: you hold the thing itself. But you take on storage, insurance, security, and a wide buy-sell spread on physical metal. You cannot even trade it in seconds from a phone.
For most investors, a physically backed ETC captures the substance of direct ownership (a claim on real, allocated metal) without the hassle of a vault, which is exactly why physical gold ETCs are so widely held.
Where ETCs Fit in a Portfolio
If used well, ETCs do a terrific job and play three key roles:
An inflation and crisis hedge: Commodities, and gold above all, have historically held value when inflation bites and when markets panic. A physical gold ETC is the cleanest, cheapest way for most investors to hold that hedge without a vault.
A diversifier: Because commodity returns are driven by supply and demand for physical goods rather than corporate earnings, they tend to have low correlation with equities. A modest commodity sleeve can lower a portfolio’s overall volatility.
A tactical expression of a view: If you have a specific conviction, a single-commodity ETC is the precise instrument to express it.
That being said, two cautions complete the picture. Keep the allocation modest, as commodities are volatile and pay no income, so they are a portfolio seasoning rather than a staple. And match the tool to the holding period: a physical metal ETC is fine for the long term, but a futures-based ETC, with its roll drag, is better suited to shorter, tactical positions.
The Alternative Fortune View
Even though commodities have had a rough run over the past few years, if you look long-term, having exposure to them definitely benefits your portfolio.
While nobody has a crystal ball and can accurately predict what will happen in the markets, supply chain constraints and turbulence in the oil market act as tailwinds for commodities.
And Exchange Traded Commodities (ETCs) solve a real problem elegantly. They take assets that are awkward to own and turn them into something you can buy and sell in a second from an ordinary account.
For single-commodity exposure, and for gold in particular, they are the tool most investors should reach for.
But the elegance hides moving parts, and the investor’s job is to know which ones apply to what they are buying.
The product looks simple. But understanding it is the part that pays.