Everyone is watching the oil price. They are watching the wrong number. Since Iran declared the Strait of Hormuz closed to commercial shipping on March 2, 2026, tanker transits through the world's most critical maritime artery have collapsed by approximately 90%, per Kpler data. Oil markets reacted first and loudest—Brent crude briefly touched $119.50 on March 9. But a quieter, slower, and arguably more structurally damaging crisis is accelerating in parallel. The Gulf doesn't just export crude. It exports sulphur—a yellow byproduct of oil and gas refining that underpins the production of fertilisers, copper, nickel, semiconductors, and dozens of other industrial commodities. When the oil stops moving, so does the sulphur. And the financial consequences of that fact are only beginning to surface.
The Core Problem
Sulphur is the world's most underappreciated industrial input. Around 92% of global sulphur production occurs as a byproduct of petroleum refining and natural gas processing, according to the US Energy Information Administration. The Gulf's sour oil and gas fields—running through Qatar, Saudi Arabia, the UAE, and Kuwait—make the region responsible for a disproportionate 44% share of global sulphur output, per EIA data. That figure is nearly twice the Gulf's share of global hydrocarbon production. This is not a coincidence. It reflects the chemical composition of Gulf crude, which is high in sulphur content and requires intensive processing that yields sulphur as a recoverable byproduct.
Sulphur's downstream product—sulphuric acid—is the most produced industrial chemical on Earth. Its applications span phosphate fertiliser manufacturing, copper and nickel hydrometallurgical processing, semiconductor wafer cleaning, lead-acid battery production, and dozens of petrochemical processes. A disruption to sulphur supply doesn't hit one industry. It hits many simultaneously, at different speeds, with different lag times.
The financial stakes are already measurable. According to ICIS, the Independent Commodity Intelligence Services, urea prices surged 26% in the single week following the war's outbreak on February 28—the largest week-on-week increase this decade. Saudi Arabia raised its export urea price to $450 per tonne FOB, up sharply from $402 per tonne before the conflict, per Kpler. London Metal Exchange copper prices surged past $13,000 per tonne by March 10, 2026. Indonesia—which supplies more than 50% of global nickel and relies on the Middle East for 75% of its sulphur imports—is now facing the prospect of forced production cuts at HPAL nickel processing plants within weeks, per Reuters. The question isn't whether the disruption is real. It's how many sectors break before the Strait reopens.
Historical Parallel
The closest historical analogue is the 1973 Arab oil embargo, when OPEC nations cut petroleum exports to the United States and other Western countries in retaliation for their support of Israel during the Yom Kippur War. From October 1973 to March 1974, oil prices quadrupled—rising from approximately $3 per barrel to $12 per barrel. What made that shock systemically devastating was not the direct fuel cost to consumers, but the cascading industrial disruptions that followed. Fertiliser prices surged alongside energy costs. Food price inflation accelerated. Industrial production slowed across Europe and North America, contributing to the stagflationary episode that defined much of the mid-1970s.
The current disruption carries a structural resemblance, with two important amplifications. First, in 1973, the oil embargo was a supply reduction—crude kept moving, just less of it. Today, the Strait is effectively closed, halting physical shipments of oil, LNG, and critically, sulphur. Second, the current global industrial supply chain is far more interconnected than it was in 1973, meaning second-order shocks propagate faster and with less buffer time.
A more recent, partial parallel is the March 2021 blockage of the Suez Canal by the container ship Ever Given, which disrupted global trade for six days and caused an estimated $9.6 billion in daily trade losses, per Lloyd's List. That incident was resolved in less than a week and involved no destruction of refining infrastructure. The Hormuz closure is a deliberate military action with no fixed end date and active damage to regional energy processing capacity. The financial markets are still pricing in a resolution. History suggests the cost of being wrong about that assumption is very high.
The Data Under the Hood
The numbers from the first nine days of the Hormuz disruption establish a clear financial pattern across four separate commodity markets, each moving in response to the same underlying supply constraint.
On fertilisers: roughly one-third of the world's traded nitrogen fertiliser—including urea, ammonia, and phosphates—normally transits through the 21-mile-wide Strait of Hormuz, per Kpler. Gulf producers Qatar, Saudi Arabia, and the UAE collectively export 1.5 to 1.8 million tonnes of sulphur per month through this route. If the Strait closure drops sulphur supply by 44%, as Kpler's disruption modelling projects under a full-closure scenario, global phosphate fertiliser production faces an acid feedstock crisis within four to six weeks. Urea, already up 26–35% week-on-week per ICIS, has reached three-year price highs. US farm groups reported on March 10 that fertiliser ships remain idle in Gulf ports with no timeline for movement.
On copper and nickel: LME copper surged past $13,000 per tonne as of March 10—a level that represents a geopolitical premium layered on top of an already structurally tight market. Analysts at FinancialContent reported that if the Strait remains closed for 30 or more days, copper could test the $15,000 per tonne level, a price point likely to trigger demand destruction in construction and consumer electronics. Sulphuric acid generation costs near African copperbelt smelters have already risen toward $300 per tonne, per Dr. Nicolaas C Steenkamp's March analysis for African Mining Online—a level that puts marginal and low-grade ore producers into negative operating margin territory.
On semiconductors: the Baltic LNG index surged more than 500% in the week following the war's outbreak, per Alex Krainer's market report. Qatar—the world's largest LNG exporter—supplies approximately 30% of Taiwan's LNG imports through Hormuz, per industry estimates. Taiwan holds roughly 10 to 11 days of LNG reserves under normal consumption. TSMC, which produces about 90% of the world's most advanced chips and consumes approximately 8.9% of Taiwan's total electricity, sits at the end of this supply chain. The semiconductor sector thus faces a double threat: ultra-pure sulphuric acid shortages affecting wafer cleaning and fabrication, and potential LNG-driven electricity rationing at the world's most critical fab operations.
Two Sides of the Coin
The bull case for a swift market recovery rests on two credible foundations. First, diplomatic signals have already moved prices. On March 10, US President Trump indicated openness to negotiations with Tehran, triggering an immediate crude oil retreat from its $119 peak and an 8% intraday rally in InterGlobe Aviation and SpiceJet shares. If a ceasefire or verified Hormuz reopening emerges within two to three weeks, the sulphur supply disruption may not run long enough to force industrial production cuts—fertiliser inventories, copper stockpiles, and existing LNG contracts could absorb a short shock. Second, Canada holds significant sulphur reserves and has the capacity to increase exports, though analysts at bne IntelliNews noted that transport constraints and existing trade flows make rapid replacement of Gulf volumes logistically difficult, not impossible.
The bear case, however, sits on harder structural foundations. Sulphuric acid is not a commodity that pivots quickly. New acid capacity cannot be switched on in weeks. Sulphur is a bulk commodity that requires specialised storage and cannot be economically airfreighted. The Oregon Group noted on March 9 that despite oil prices partially retreating, sulphur prices continued to rise—a signal that the physical market is repricing the actual supply shortage, not the headline crude number. Indonesia's HPAL nickel plants carry only one to two months of sulphur inventory, per Reuters. African copperbelt acid plants typically hold a few weeks to two months of stock, per Dr. Steenkamp's analysis. If the Hormuz closure extends past four weeks, the question shifts from margin compression to forced production stoppages. And forced production stoppages in copper, nickel, and phosphate fertilisers are not resolved in a quarter—they cascade into the next planting season, the next EV manufacturing cycle, and the next semiconductor supply contract.
Scenarios & What-Ifs
Three market scenarios are now in play, each carrying distinct financial implications for commodity traders, equity investors, and agricultural supply chains.
Scenario one—high near-term probability: Hormuz reopens within two to three weeks following diplomatic de-escalation. Sulphur inventories hold. LNG deliveries resume. Urea retreats from three-year highs. LME copper pulls back from $13,000+ but retains a geopolitical risk premium. The dominant financial impact is a single bad quarter across fertiliser, nickel, and aviation equities—painful, but manageable.
Scenario two—moderate probability: Partial shipping resumes under naval escort arrangements, but refinery damage and insurance costs keep sulphur exports 30–40% below pre-conflict levels for one to two months. Copper and nickel face sustained 15–25% cost inflation at processing plants. Indonesia's lower-margin HPAL operations announce partial production suspensions. Urea holds near current highs through the spring planting window, hitting farm-level economics in Brazil, India, and the US Midwest.
Scenario three—lower probability, non-trivial risk: The conflict extends beyond six weeks with active refinery destruction continuing. Gulf sulphur production drops near 44%, as the Kpler full-closure model projects. Taiwan implements electricity rationing. LME copper tests $15,000 per tonne. African copperbelt operators declare force majeure. This scenario doesn't just reprice commodities—it reprices the cost of the green energy transition itself, since copper, cobalt, and nickel are its foundational inputs.
The Bottom Line
The oil price is the headline, but the sulphur famine is the story the bond and commodity desks are actually watching. One chemical byproduct—produced in vast quantities precisely because the Gulf processes so much sour crude—now threads through fertilisers, microchips, copper, and nickel in ways that markets have not fully priced. Watch the LNG index, Indonesia's HPAL production reports, and any ceasefire timeline—those three data points will tell you whether this stays a one-quarter earnings story or becomes a structural input cost shock lasting into 2027.
