Strait of Hormuz Closure Threatens Aluminum, Sulfur Flows—Amplifying Supply Risk for Metals Sector

The immediate shock is not just to oil prices, but to the physical flow of key industrial materials. The closure of the Strait of Hormuz, a vital maritime chokepoint, has halted 20% of the world's seaborne oil supply. This isn't a minor detour; it's a fundamental blockage of the energy artery for global industry. The ripple effect is already visible, with major shipping lines rerouting around the Cape of Good Hope, adding thousands of miles and significant fuel costs to every voyage.

This energy disruption hits energy-intensive industries directly. For semiconductor manufacturing, a sector already facing capacity constraints, the rise in energy prices is a critical cost headwind. As one analysis notes, increases in energy prices resulting from the besieged Strait of Hormuz will raise production costs for semiconductor manufacturing. This sector, which relies on imported energy from the Middle East, now faces a new layer of friction.

The vulnerability extends to specific metals. The Middle East has become a major aluminum manufacturer, accounting for over 8% of global production. More critically, nations from the Middle East supplied nearly 20% of the total U.S. supply of aluminum in 2025. A sustained disruption to shipping lanes directly threatens the steady flow of this essential metal to the world's largest consumer, creating a tangible risk of supply shortages for industries from automotive to construction.

The supply chain pressure is compounded by the region's role in providing another critical feedstock: sulfur. The Middle East is a major global provider of sulfur, a raw material essential for making sulfuric acid. This acid is a key ingredient in fertilizer production and serves as a cleaning agent in semiconductor wafer fabrication. Disruptions to the movement of sulfur could therefore ripple through both agricultural and high-tech manufacturing sectors.

The bottom line is that this conflict has targeted the physical arteries of global industry. By paralyzing the Strait of Hormuz and threatening the flow of energy, aluminum, and sulfur, it has exposed the deep, often overlooked dependencies of modern manufacturing on stable Middle Eastern supply chains.

Cycling Through the Shock: Metals vs. Energy in 2026

The physical disruption from the Iran conflict arrives against a sharply diverging backdrop for commodity cycles. The pre-existing forecast for 2026 sets up a clear split: energy is expected to weaken, while metals are poised to outperform. This divergence frames how the conflict's shock will be absorbed.

The outlook for energy is one of persistent pressure. Analysts predict the sharpest declines for oil, driven by a growing global surplus where supply growth will be three times higher than demand growth. Morgan Stanley and JPMorgan have already lowered their forecasts, with the latter seeing average prices for Brent and WTI crude oil for 2026 at $58 and $54 per barrel. This sets a baseline of low prices and oversupply, where geopolitical events can only have a lasting price impact if they cause actual production losses-a high bar to clear.

In stark contrast, the metals sector is forecast for a more supportive cycle. The latest commodity price forecasts point to a clear divergence: metals are expected to outperform, while energy and agricultural commodities weaken on average. This outperformance is driven by investment-led demand from data centers and clean energy infrastructure. Base metals, in particular, are expected to see robust demand from these sectors, while precious and battery metals are forecast to record the fastest price growth due to strong investor demand and policy tailwinds.

This sets up a nuanced dynamic for the conflict's impact. The physical blockage of the Strait of Hormuz directly threatens the flow of energy and energy-intensive metals like aluminum. Yet, the broader cyclical forces are working in opposite directions. For energy, the conflict's potential to tighten supply could provide a temporary price support, but it faces a powerful headwind from the baseline forecast of surplus and weak demand. For metals, the disruption to aluminum and sulfur flows introduces a new supply risk that could amplify the existing positive demand cycle, particularly for battery and precious metals that are already seeing strong investor tailwinds.

The bottom line is that the conflict's shock will interact differently with each cycle. In energy, it may create a temporary, noisy spike against a longer-term downtrend. In metals, it could serve as a catalyst, pushing prices higher within an already supportive structural framework. The divergence in 2026's forecast makes the outcome for each sector less about the conflict's magnitude and more about which cycle-short-term supply shock or long-term demand trend-wins out.

The Macro Backdrop: Policy Tailwinds vs. Geopolitical Risk

The physical shock of the conflict is a powerful short-term event, but the longer-term trajectory for commodities will be set by deeper macro forces. The established 2026 outlook points to a market of low prices and oversupply, where the conflict's impact will be judged against a powerful baseline of weak demand and economic stagnation. For the metals sector, this creates a tension between a supportive structural cycle and a new, unpredictable risk.

The broad forecast is one of pressure. Analysts predict stagnation or falling prices for key commodities, from oil to steel, driven by a global economy facing slower growth and expanded production capacity. This sets a floor under many raw materials. The supply-demand imbalance is stark, with supply growth three times higher than demand growth for oil alone. In this environment, a geopolitical event can only push prices meaningfully higher if it causes a sustained loss of physical production or trade, not just a temporary rerouting of ships.

Yet within this weak macro backdrop, a powerful counter-current is building for metals. The energy transition is accelerating investment in clean technologies, creating a new source of demand that is already visible. As one analysis notes, global energy sector investment is set to reach a record $3.3 trillion in 2025, with two-thirds going into clean energy. This capital flow is directly fueling demand for the metals used in solar panels, wind turbines, and electric vehicles. The forecast for 2026 reflects this divergence, with metals expected to outperform while energy and agricultural commodities weaken on average. This policy tailwind provides a structural floor and a growth vector that a temporary supply shock could amplify.

The conflict introduces a new variable, but its ability to override these established cycles depends entirely on the duration and escalation of the military standoff. The immediate closure of the Strait of Hormuz has already halted 20% of the world's seaborne oil supply and disrupted critical flows of aluminum and sulfur. For energy, this could provide a temporary price support against the baseline of surplus. For metals, the disruption to aluminum and sulfur-key inputs for semiconductors and fertilizer-adds a new layer of supply risk. This could act as a catalyst, pushing prices higher within the already supportive demand cycle for battery and precious metals.

The bottom line is that the conflict is a shock to the system, but not necessarily a shock to the trend. The macro backdrop of weak global demand and oversupply provides a headwind for many commodities. However, the powerful, policy-driven demand for metals from the energy transition offers a countervailing force. The conflict's lasting impact will be determined by whether the geopolitical risk persists long enough to disrupt the physical flow of these critical materials, thereby reinforcing the metals outperformance forecast, or if it fades, allowing the underlying macro pressures to reassert themselves.

Catalysts and Risks: What to Watch for the Thesis

The thesis that this conflict is a cyclical disruption, not a permanent regime shift, hinges on a few key forward-looking events. The resolution of the military standoff and the reopening of the Strait of Hormuz will be the first and most critical test. A prolonged closure would validate the scenario of a major, sustained supply shock for aluminum and sulfur, directly challenging the baseline forecast of weak demand and oversupply. The immediate impact is already visible, with 20% of the world's seaborne oil supply halted and major shipping lines rerouting around the Cape of Good Hope. If this paralysis extends beyond a few weeks, it will force a reassessment of physical availability for energy-intensive metals and critical industrial feedstocks.

The second major catalyst is the divergence in price action between energy and metals. The pre-existing forecast points to a clear split: metals are expected to outperform, while energy and agricultural commodities weaken on average. A sustained rally in base and battery metals, driven by investment-led demand from data centers and clean energy, would strongly support the cyclical outperformance thesis. It would signal that the positive demand cycle from the energy transition is robust enough to absorb or even be amplified by the conflict's supply risk. Conversely, if metals prices fail to hold their ground against the broader macro headwinds, it would suggest the disruption is not a powerful enough catalyst to override the structural pressures of stagnation and oversupply.

Finally, watch for changes in global growth forecasts and inflation data. These longer-term cycles will ultimately dictate commodity valuations. The baseline outlook is one of low prices and oversupply, where the conflict's impact is secondary. However, if the geopolitical risk leads to a sharper slowdown in global trade and economic activity, it could deepen the weakness across all commodities, including metals. On the flip side, persistent supply disruptions could feed into inflation, particularly for energy and metals, which would challenge the forecast of falling prices. The key will be whether the conflict's shock is absorbed within the existing cyclical framework or if it triggers a broader reassessment of growth and inflation risks.

The bottom line is that the conflict is a test of cycles. The reopening of the Strait will reveal the duration of the physical shock. The metals rally will show the strength of the demand tailwind. And the growth/inflation data will confirm whether this is a temporary noise or a signal of a deeper shift. For now, the evidence points to a cyclical event, but these are the metrics that will prove it.