Commodities Investing for International Investors: A Complete Guide

Commodities are the raw materials of the global economy: the oil that powers transport, the copper that conducts electricity, the wheat that feeds populations, the gold that anchors currency reserves. As investments, they have characteristics that are genuinely different from both equities and bonds — which is precisely what makes them interesting as portfolio additions.

For internationally mobile investors, commodities have specific appeal: they are priced in US dollars, providing currency diversification for non-dollar portfolios; they hedge against inflation in a way that nominal bonds cannot; and their returns are driven by physical supply and demand, not by financial market sentiment.

This guide explains the commodity asset class, the access routes available to individual investors, the material differences between real commodity exposure and commodity equity exposure, and the case — and limits — for commodity allocations in international portfolios.

The Main Commodity Categories

For investment purposes, commodities fall into three broad categories:

Energy

Oil (Brent Crude and WTI Crude): The world's most traded commodity. Prices are driven by OPEC+ production decisions, global economic growth (which determines demand for transport and industrial production), and geopolitical disruptions. Oil is a major component of most broad commodity indices.

Natural gas: Price dynamics differ significantly from oil — more regional, more seasonal, more affected by weather. The 2022 European energy crisis demonstrated how rapidly natural gas prices can move in response to geopolitical events.

Uranium: A distinct energy commodity driven by nuclear power capacity decisions. Uranium demand is long-cycle, tied to the construction and operation of nuclear reactors. As nuclear power is reassessed as a low-carbon energy source, uranium demand may grow structurally over the next decade.

Metals

Gold: The most widely held commodity by private investors globally. Gold is simultaneously a commodity, a currency, a financial reserve asset, and a store of value. Its price is less closely tied to industrial demand than other metals, driven instead by real interest rates, currency dynamics, and risk sentiment.

Silver: Both an industrial metal (used extensively in electronics and solar panels) and a monetary metal, sharing some of gold's store-of-value characteristics but with much higher volatility.

Copper: Often called "Dr Copper" for its sensitivity to global economic health — copper is used in construction, manufacturing, and electrical systems, making its price a reasonable leading indicator of industrial demand. The energy transition is a major structural driver of long-term copper demand (EVs and renewable energy infrastructure are extremely copper-intensive).

Lithium and nickel: Critical metals for electric vehicle battery production. Both have experienced extraordinary price volatility as EV demand has grown unevenly. Supply is concentrated geographically, creating geopolitical risk.

Platinum and palladium: Industrial metals with significant automotive applications (catalytic converters). Platinum has been reassessed as a potential green hydrogen catalyst.

Agriculture

Grains (wheat, corn, soybean): Prices driven by weather, growing seasons, trade policy, and biofuel demand. High volatility; strong correlation to geopolitical events affecting major exporting countries (Russia and Ukraine supply a significant share of global wheat).

Soft commodities (coffee, sugar, cocoa, cotton): Subject to weather events, growing region specific risks, and commodity-specific demand trends.

Agricultural commodities are among the most difficult for individual investors to access efficiently, and most broad commodity indices have a lower agricultural weighting than metals and energy.

Why Commodities Are Relevant for International Investors

Inflation Hedge

Commodities are the purest direct inflation hedge available in financial markets. Consumer price inflation, almost by definition, includes rising commodity prices — when oil, food, and metals rise, CPI rises. Holding commodities — directly, or via ETFs — provides returns that are correlated with the inflation environment that reduces the real value of cash and nominal bonds.

In the 2021–2023 inflationary episode, broad commodity indices rose substantially while bonds fell. Investors with commodity exposure experienced significantly better inflation-adjusted outcomes than those holding only traditional financial assets.

Diversification

Over long periods, commodities have exhibited low correlation to equities. They are driven by physical supply-demand dynamics — droughts, mine strikes, OPEC decisions — that operate independently of corporate earnings cycles or central bank policy. This genuine independence is rare among liquid asset classes, making commodities genuinely valuable for portfolio diversification.

The caveat: in severe equity market crashes (2008, March 2020), commodity prices often fell alongside equities as global demand collapsed. Commodity diversification works better during moderate economic slowdowns and inflationary periods than during acute financial crises.

USD Denomination and Currency Diversification

Most commodities are priced in US dollars on international markets. For investors holding sterling, euro, or other currencies, this provides indirect USD exposure. In periods when the dollar weakens (often coinciding with non-US economic outperformance and commodity demand growth), commodity returns in local currency terms are enhanced. This USD exposure is a form of currency diversification for non-dollar investors.

Supply-Demand Independence

Commodity prices are ultimately anchored by physical supply and demand — not by financial engineering, analyst expectations, or sentiment. This makes commodity investment less susceptible to the valuation compression and re-rating risks that affect equities, and provides a different underlying driver for returns.

How to Access Commodities

Physical ETCs (Exchange Traded Commodities)

For gold, the most straightforward access is via physical gold ETCs, which hold actual gold bullion in secure vaults:

• iShares Physical Gold ETC (IGLN): London-listed, physically-backed, low ongoing charges.
• Invesco Physical Gold ETC (SGLD): Competitive alternative, also London-listed and physically-backed.
• SPDR Gold Shares (GLD): US-listed, the world's largest gold ETF, high trading volume and liquidity.

Physical gold ETCs give direct exposure to gold bullion prices without the storage and security challenges of owning physical gold directly. They are as close as individual investors can get to genuine gold ownership in a liquid, low-cost format.

For silver, platinum, and palladium, physical ETCs are also available from iShares and similar providers.

Futures-Based Commodity ETFs

For most non-gold commodities — oil, natural gas, agriculture, industrial metals — ETFs use futures contracts rather than physical ownership (storing large quantities of oil or wheat is impractical).

A critical feature of futures-based commodity ETFs is roll cost (also called "negative roll yield" or "contango"). When a futures contract expires, the ETF must sell the expiring contract and buy the next month's contract. If the futures curve is in "contango" — where future prices are higher than current prices — each roll involves selling cheaper (current) and buying more expensive (next month). Over time, this creates a drag on returns relative to the spot price.

Oil has historically been in contango for extended periods, meaning oil ETFs have underperformed the oil spot price significantly over long holding periods. Investors need to understand this before treating commodity ETFs as direct commodity price trackers.

Broad commodity indices (tracked by ETFs such as iShares Diversified Commodity Swap ETF or Invesco Bloomberg Commodity UCITS ETF) spread this roll cost across many commodities, reducing the impact in any single market. The roll dynamics are less damaging for a diversified commodity index than for single-commodity futures ETFs.

Commodity Equity Funds

Instead of (or in addition to) direct commodity exposure, investors can hold shares in commodity-producing companies:

• Mining companies: BHP, Rio Tinto, and Glencore provide exposure to copper, iron ore, coal, zinc, nickel, and other metals. They are FTSE 100 companies with high liquidity, dividends, and global operations.
• Energy companies: Shell, BP, ExxonMobil, and other majors provide indirect oil and gas exposure combined with dividend income and diversified energy operations.
• Commodity funds: Specialist mining equity funds (such as BlackRock World Mining Fund) provide diversified access to the mining sector globally.

Commodity equity exposure has important differences from commodity price exposure:

• Equity risk: Mining companies are affected by all the factors that affect equities — management, capital allocation, debt levels, M&A activity — in addition to commodity prices.
• Leverage: Mining companies typically have fixed costs that operate as leverage to commodity prices. In a rising commodity price environment, miners' profits rise disproportionately. The reverse is also true.
• Currency diversification: Mining companies operate globally but often report in USD or GBP, creating a mix of currency exposures.

The Negative Case for Commodities

A full picture of commodity investing must acknowledge the significant long-term risks:

Commodity bear markets can last a decade. Gold fell from approximately $1,900 per troy ounce in 2011 to approximately $1,050 by 2015, and did not sustainably exceed $1,900 again until 2020. Investors who bought gold in 2011 waited nine years to break even in nominal terms, and longer in real terms. Agricultural commodity indices have underperformed broad equity indices over most 10-year periods.

The energy transition undermines fossil fuel long-term demand. Oil and natural gas face structural demand headwinds as transport electrifies and renewable energy replaces fossil fuel power generation. This does not eliminate oil's investment case in the near term, but it means long-term commodity investors should not assume that historical demand growth rates will persist.

Agricultural commodities are difficult to manage. Weather events, geopolitical disruptions, and trade policy changes create extreme short-term volatility in agricultural prices. These are among the hardest commodities for long-term investors to hold with conviction.

Portfolio Sizing

Most professional portfolios that include commodities allocate 5–10% of total portfolio value. The rationale:

• Sufficient to provide meaningful inflation protection and diversification benefit
• Not so large as to create significant portfolio volatility from commodity price swings
• Weighted toward metals (particularly gold) over energy and agriculture, for individual long-term investors

A higher allocation — 10–15% — is justified if inflation protection is a primary objective, particularly for investors who are heavily exposed to currency risk or whose spending is in markets experiencing high structural inflation.

Within the commodity allocation, a suggested split for a long-term wealth preservation portfolio:

• 50–60% in gold and silver (monetary metals with preservation characteristics)
• 30–40% in a broad commodity index ETF (diversified exposure)
• 0–20% in specific commodity equities (for investors wanting income alongside commodity exposure)

How Global Investments Can Help

At Global Investments, we help internationally mobile investors incorporate commodities into diversified portfolios in a way that is appropriate to their objectives, time horizon, and tax situation. We advise on the most suitable access route — physical ETCs, futures-based ETFs, commodity equity funds — and on appropriate portfolio sizing relative to existing real asset exposure.

Our independent perspective ensures commodity recommendations are based on portfolio merit, not product distribution considerations.

Please note that all investments carry risk. Commodity prices are highly volatile and can experience extended bear markets. Futures-based commodity ETFs may significantly underperform spot price movements due to roll costs. Physical gold ETCs involve custody and counterparty risk. This guide is for information purposes only and does not constitute personalised financial advice. Past performance is not a reliable guide to future returns. Always seek professional advice relevant to your specific circumstances.