On September 4, 2026, just four commodity vessels crossed the Strait of Hormuz, against a ten-day average of fifteen. That single data point encapsulates a crisis now entering its seventh month, one that has reshaped freight costs, war-risk insurance, critical mineral procurement timelines, and energy prices from Tokyo to Rotterdam. This article explains what the traffic collapse means, why it matters beyond oil markets, and what the compounding layer of export restrictions on critical minerals makes significantly worse.
Introduction
On September 4, 2026, shipping analytics firm Kpler counted four commodity vessels crossing the Strait of Hormuz. Against a ten-day average of fifteen, that number is not a blip. It is a signal that the world's most consequential maritime chokepoint remains, for practical purposes, closed to routine commercial traffic.
The four vessels that did cross were two medium-range tankers, a Kamsarmax bulk carrier, and a Handysize vessel. Kpler issued a standard caveat alongside the data: the figure is almost certainly an undercount, because some ships disable their Automatic Identification System transponders to avoid detection while navigating the strait. Even so, the direction of the number tells the story clearly enough. Traffic was nine vessels on September 3, eleven on September 2, and down from a pre-war daily average of roughly 135 in February 2026.
This matters to an unusually wide audience. If you run a smelter, a fertiliser plant, or a battery materials refinery, your energy input costs are shaped by what happens in this waterway. If you manage procurement for a manufacturer anywhere in the supply chains for electric vehicles, construction, or food production, freight rates and delivery timelines on routes far from the Gulf are also being affected. The Hormuz crisis is simultaneously an energy story, a shipping story, a critical minerals story, and a trade policy story. Understanding each layer helps explain why recovery is proving so much slower than early optimists expected.
How We Got Here: A Crisis Now in Its Seventh Month
The disruption began on February 28, 2026, when coordinated US-Israeli airstrikes on Iran triggered an immediate retaliatory response from the Iranian Revolutionary Guard Corps. Within days, the IRGC had issued passage warnings, boarded and attacked merchant vessels, and laid sea mines in the strait. By March 2, Iran had formally announced closure to commercial shipping. The effect was near-instantaneous: AIS data showed outbound traffic from the Persian Gulf across crude oil, LNG, and fertiliser-related products collapse almost simultaneously.
The scale relative to the pre-war baseline is difficult to overstate. In February 2026, approximately 135 large commercial vessels crossed the strait each day, carrying roughly 20 million barrels of crude oil and oil products along with a quarter of global LNG supply. From March 1 to March 18, Kpler recorded just 105 commodity carrier crossings in total. By March 25, the count for a single day fell to zero. The world's most heavily trafficked energy corridor had, for a moment, stopped moving anything at all.
A brief and partial resumption followed in June under a US-Iran agreement, but renewed attacks on commercial vessels broke that down in early July. As of July 30, the strait was again effectively closed to routine commercial shipping. The period from April 13 to May 29 included a simultaneous US blockade of Iranian ports, layering additional disruption onto an already fractured system. The September 4 data point, then, is not a fresh crisis. It is the continuation and, following a late-August escalation of hostilities, a renewed deepening of a disruption that has now persisted across two full financial quarters.
What the Traffic Numbers Actually Mean
Raw vessel counts can be hard to interpret without context, so it is worth spelling out what movement at four to six ships per day actually represents in practical terms. Under normal conditions, the strait handles the oil needs of Japan, South Korea, India, China, and much of Europe simultaneously. Japan, for example, sourced more than 90 percent of its crude from the Middle East before the war. The country is now drawing down stockpiles and sourcing from the United States while its refiners scramble to restructure long-term supply contracts.
Jotaro Tamura, CEO of Mitsui OSK Lines, made the shipping industry's assessment plain in a statement issued in early September. "Given the current situation, it's difficult to see operations resuming in any form by the end of the year," he said, noting that recent attacks had elevated risk well beyond the level his company could accept. Mitsui OSK had previously assumed a gradual resumption from October, with full normalisation by January 2027. That timeline has now been abandoned. Richard Meade, editor of Lloyd's List, described the current environment at a September webinar as "peak disruption," noting that even the workarounds the industry has found, including dark transits close to the Iranian coastline and ship-to-ship transfers in open water, carry significant operational and safety risks.
The vessels that are moving are predominantly Iranian-linked, part of the so-called dark fleet, or flying flags of countries Iran considers non-hostile, primarily Russia and China. State-backed carriers from Saudi Arabia, Bahrain, Qatar, and Kuwait can absorb some risk because of sovereign backing, as Campbell University professor Sal Mercogliano noted to USNI News. For the broader commercial fleet, the economics simply do not work. Iran's Persian Gulf Strait Authority added a further layer of legal complexity on September 14, issuing a list of 77 vessels facing passage penalties and warning insurers, P&I clubs, and classification societies to stop servicing them.
Insurance, Freight, and the Cost Cascade Beyond the Gulf
One of the least visible but most consequential effects of the Hormuz closure is what it has done to war-risk insurance. Within 48 hours of the February 28 airstrikes, premiums surged fivefold. Lloyd's Joint War Committee redesignated the entire Arabian Gulf as a conflict zone, and major marine insurers terminated existing coverage before reissuing policies at roughly sixty times pre-crisis rates. By July, Marcus Baker, Global Head of Marine at Marsh, was telling S&P Global Platts that additional war-risk premiums had reached between 7.5 and 10 percent of hull value, up from 1 to 3 percent just weeks earlier.
To make that concrete: a tanker worth $100 million now faces war-risk premiums of between $7.5 million and $10 million for a single transit, compared to roughly $250,000 before the conflict. For a 270,000-metric-tonne supertanker, insurance costs at peak tension have been assessed at around $21 million per voyage. Shipping crude oil from the Persian Gulf to China via Hormuz was running at approximately $78 per metric tonne by mid-2026, roughly four times the five-year pre-conflict average, with war-risk insurance alone accounting for more than $20 per tonne of that figure.
Those costs do not stay in the shipping industry. They move into refinery margins, then into the price of refined products, then into the cost of road, sea, and air freight globally, because fuel sits underneath virtually every other logistics cost. Procurement managers across manufacturing, agriculture, and construction are already absorbing supplier price increases they trace directly to these freight and energy input pressures. Lean, just-in-time supply chains have been particularly exposed: a route closure that might have caused a manageable delay under previous conditions can now escalate into a production halt for companies that carry minimal buffer stock. Over 44,000 businesses across 174 economies had at least one shipment exposed to Hormuz-linked disruption as of mid-March, according to Dun and Bradstreet maritime container data. That number has grown considerably since.
Critical Minerals: A Double Burden of Physical Disruption and Regulatory Complexity
As I reported in September, the Hormuz closure has created a rare double bind for Gulf aluminium producers, cutting off both outbound shipments of finished metal and inbound supplies of alumina feedstock. But the disruption extends well beyond aluminium. Sulphur and sulphuric acid, essential to copper, nickel, lithium, cobalt, and phosphate processing, flow through Gulf routes in substantial quantities. When those routes close, acid shortages follow quickly, and processing plants from Chile to Zambia feel the pressure. The DRC's Kamoa-Kakula smelter has emerged as a partial regional buffer, but as I noted in my analysis of that development, byproduct acid is a buffer and not a structural solution.
Layered on top of the physical shipping disruption is a second, slower-moving constraint: a wave of regulatory export restrictions on the critical minerals themselves. According to UNCTAD's Global Trade Update for June 2026, nearly 100 export-related measures on critical minerals have been introduced since 2020. These include 37 licensing requirements, 31 export taxes, and 29 outright export bans. The Democratic Republic of Congo has introduced the highest number of measures, followed by China and Indonesia. The OECD's separate inventory confirms that export restrictions on critical raw materials have increased fivefold since 2009, and that between 2022 and 2024, approximately 16 percent of global trade in critical raw materials faced at least one export restriction, up from around 12 percent in 2009 to 2011.
For certain materials, the exposure is acute. Around 70 percent of global exports of cobalt and manganese were subject to at least one export restriction. For rare earth elements, graphite, and lithium, the combination of export controls and physical shipping disruption creates compounding risk: the regulatory complexity makes rerouting harder even when alternative shipping lanes exist, and it raises the administrative cost of every procurement decision in the minerals supply chain. UNCTAD frames this tension carefully: for mineral-producing countries, export restrictions can support domestic processing, local job creation, and revenue capture; for importing nations, the same measures represent a supply security threat. Both perspectives are legitimate, which is precisely why the policy tension is so difficult to resolve in a crisis environment.
Workarounds and Their Limits
The obvious question is whether the shipping industry, oil producers, and commodity markets can route around the problem indefinitely. The short answer is: partially, expensively, and with limited headroom.
Saudi Arabia has an East-West pipeline running to Yanbu on the Red Sea, and the UAE can export through the Fujairah terminal on the Gulf of Oman, with plans to double capacity there to 3.6 million barrels per day. But these bypass options cover only a fraction of normal Hormuz flows. Iraq, Kuwait, Qatar, and Bahrain have no meaningful alternative export infrastructure. The US Energy Information Administration is explicit on this point: the majority of Hormuz exports have no practical alternative route. Treasury Secretary Scott Bessent suggested in G20 remarks that the strait could become a "worthless piece of water" within two years as bypass capacity expands, but that timeline assumes infrastructure construction proceeds without disruption, which is not a safe assumption given Houthi activity targeting the Yanbu pipeline corridor.
For the broader commodity fleet, the alternative to Hormuz is the Cape of Good Hope routing, which adds significant distance, fuel cost, and time to voyages from the Gulf to Europe or the Americas. Vessels that would have transited Hormuz and Suez in roughly three weeks now face journeys of six or more weeks around southern Africa. This tightens vessel availability on multiple routes simultaneously, because the same ships take longer to complete each voyage. The knock-on effect is higher time-charter rates globally, affecting commodity shipments that have nothing to do with the Gulf at all.
Dark transits offer another partial workaround, but they carry real risks. The IRGC monitors a narrow northern corridor along the Iranian coastline; vessels that transit that corridor without authorisation risk boarding or attack. Twenty-four commercial vessels have been attacked or reported incidents in the Gulf, Hormuz, or the Gulf of Oman since March 1, according to UKMTO. At least eight seafarers and dock workers have died. Around 6,000 seafarers are currently trapped in the region.
What to Expect in the Months Ahead
The EIA's current forecasts assume some constraints on Middle East oil exports will persist through the end of 2026, with production remaining below pre-conflict averages until at least the second quarter of 2027. Brent crude stood at $107.70 as of September 15, against a World Bank scenario range of $95 to $115 per barrel for 2026 as a whole. The insurance market, freight market, and supply chain planning models used by commodity-dependent industries are all now being recalibrated around the assumption that Hormuz will not return to normal operations this year.
For critical minerals specifically, the compounding effect of physical shipping disruption and the accumulating weight of export restriction measures points to continued pressure on procurement timelines, processing costs, and project finance calculations. UNCTAD projects that demand for lithium will increase by more than 350 percent by 2040, and graphite by over 130 percent. Those projections were made on the assumption that supply chains would be progressively diversified and de-risked. The events of 2026 have set that process back significantly.
The September 23 and 24 ANSI workshop on US critical minerals standardisation, which I covered earlier this month, takes on added urgency in this context. Traceability, labelling, and data standards become considerably more important when the physical routing of minerals is in flux and when regulatory export measures are proliferating simultaneously. The countries and industries that develop coherent frameworks for tracking and verifying mineral flows will be better positioned to navigate both the physical and regulatory complexity. The four ships that crossed the strait on September 4 are a reminder of how quickly a physical chokepoint can expose every other fragility in a supply chain that was already under pressure well before the first missile was fired.