This article first appeared on GuruFocus.
Japan’s automakers are beginning to confront a supply shock that could tighten production in the months ahead, as disruptions tied to the Iran conflict cut off a critical flow of aluminum from the Middle East. Companies including Toyota Motor Corp. (NYSE:TM) and Denso Corp. (DNZOF) are among the most exposed, with about 70% of Japan’s aluminum imports sourced from the region, according to the country’s auto lobby. Since hostilities escalated in late February, aluminum prices have risen roughly 13%, increasing cost pressure across key components such as engine parts and wheels. Industry executives are signaling that even at this early stage, supply constraints are starting to feed into operational decisions, with the risk that shortages could intensify if shipping routes remain impaired.
The impact is already showing up in production and procurement strategies. Denso and its affiliates said in late March that they have reduced monthly output by around 20,000 units, pointing to supply disruptions that are beginning to translate into losses. Smaller manufacturers are also adjusting. Kato Light Metal Industry Co., which typically imports about 400 tons of aluminum per month split between Dubai and Australia, said Middle East deliveries have stopped, leaving it with inventory that could last through May. Beyond that, the company is preparing to source material from Southeast Asia. With many Japanese manufacturers holding roughly two months of inventory, the timeline suggests that broader disruptions could emerge by the end of April or early May if conditions do not improve.
The supply outlook remains uncertain and could stay tight even in a scenario where the conflict de-escalates. Damage to key refineries in Abu Dhabi and Bahrain, along with congestion involving hundreds of ships in the Persian Gulf, may take time to resolve. Analysts at JPMorgan Chase & Co. said the aluminum market has entered a black hole that may not be easily reversed, while S&P Global identified Japan as the most vulnerable country to shortages. Even if shipping through the Strait of Hormuz resumes, normalization could take months, potentially leaving manufacturers exposed to intermittent supply gaps. That dynamic could lead to temporary factory shutdowns and further production adjustments, particularly among smaller firms with limited buffers.