Aluminum at a 4-Year High as Hormuz Disruption Reprices the Supply Chain

Section 1: What Happened and Why It Matters

Three-month LME aluminum futures rose 1.7% to $3,571 per metric ton in mid-morning European trading on April 13, their highest level since March 2022. The immediate catalyst was the breakdown of U.S.-Iran peace talks in Islamabad after 21 hours of negotiations, followed by President Trump announcing on Truth Social that the U.S. Navy would blockade any and all ships trying to enter or leave the Strait of Hormuz. U.S. Central Command subsequently clarified that the blockade would apply to maritime traffic entering or exiting Iranian ports and coastal areas, and that U.S. forces would not impede freedom of navigation for vessels transiting the Strait to and from non-Iranian ports.

The distinction matters for the aluminum market. Gulf producers export metal through the Strait to non-Iranian destinations; a blockade strictly defined as targeting Iranian port traffic therefore leaves their outbound routes formally unimpeded, while still raising insurance costs, freight risk, and operational uncertainty. The market appears to be pricing the ambiguity rather than the legal precision: the Strait has been effectively closed to most commercial traffic since late February, when Iran began restricting passage following the U.S.-Israeli strikes, and Trump’s announcement does not resolve that underlying closure.

The Middle East accounts for approximately 9% of global primary aluminum production, and the region depends almost entirely on the Strait as its export corridor and as the inbound route for alumina and bauxite raw material imports. Saudi Arabia, the UAE, and Bahrain are the principal producers. Approximately one-fifth of U.S. aluminum imports originate from Gulf Cooperation Council states.

Section 2: Technical Snapshot

Figure 1: LME Aluminum (3-Month Futures), Daily — January to April 13, 2026

The daily price structure since late February describes an accelerating advance: three consecutive higher-high, higher-low sequences have formed, and every intraday retracement since mid-March has found support near the 20-day moving average, currently at approximately $3,468. The current close of $3,571 sits 3.0% above that average and 5.4% above the 50-day level near $3,387, a configuration consistent with sustained above-average buying pressure. The MACD histogram has narrowed modestly over the past six sessions, which is consistent with short-term consolidation ahead of a continuation move rather than a directional reversal; the signal line remains positive. The $3,380–$3,420 support zone is the level at which cash premiums first turned positive after the conflict began, and a close below it would suggest the market is beginning to discount a faster diplomatic resolution than supply fundamentals currently support. Against the backdrop of a partially blocked export corridor and a one-year-plus smelter outage at Al Taweelah, the dominant technical read is that prices remain anchored to fundamental validation at or near current levels.

Section 3: The Dual Supply Shock Mechanism

Aluminum’s exposure to the Strait of Hormuz runs through two simultaneous channels. The first is the direct export channel: Gulf smelters produce metal that is almost entirely sold into international markets through that passage. With outbound shipments severely disrupted since late February, the cash market has moved into sharp backwardation. ING noted that the spread between spot delivery and the three-month contract rose from a $12 discount to a $91.5 premium per ton within weeks of the conflict escalation, a move that reflects genuine near-term scarcity rather than speculative positioning.

The second channel is the raw material import channel. The Gulf region produces only approximately 3% of global alumina and 1% of bauxite, making its smelters heavily dependent on seaborne inflows of raw material through the same chokepoint. Extended disruption to the Strait therefore strains both outbound metal exports and inbound production inputs simultaneously. ING has stated that a sustained disruption would further tighten regional supply and support premiums, with higher energy prices adding cost pressure across the smelting base.

The extent of the physical disruption is reflected in force majeure declarations from two Gulf producers. Emirates Global Aluminium declared force majeure on some contracts after Iranian missile strikes caused significant damage to its Al Taweelah plant, stating that full restoration could take up to a year. Bahrain’s Alba reduced output in March because of shipping disruptions. Norsk Hydro reduced production at its Qatalum smelter in Qatar, citing gas-supply disruption. Citi raised its 0–3 month LME aluminum target to $3,600 per ton on March 4, stating that force majeure at two Gulf producers marked a clear shift from risk to realised disruption, and set a bull-case ceiling of $4,000 per ton. UBS raised its 2026 LME price forecast by 13% to $3,250 per ton. Goldman Sachs, in its March 3 base case, projected an H1 2026 average of $3,150 per ton, but separately noted that a one-month halt to Gulf production could push prices to $3,600.

LME warehouse inventories illustrate the pre-existing tightness into which the supply shock has landed. Registered stocks fell to 418,675 tonnes as of March 27, the lowest level since July 2025, continuing a drawdown that predates the conflict. Average inventory at end-December 2025 was approximately 522,771 tonnes, itself down 28.4% year-on-year.

The Strait of Hormuz does not only block outbound metal; it simultaneously restricts the alumina and bauxite inflows that keep Gulf smelters running, creating a compounding supply deficit that no inventory buffer can absorb at current LME stock levels.

Section 4: Historical Context and Supply Reorientation

The closest historical analogue is the April 2018 supply shock following U.S. sanctions on Russian producer Rusal. LME prices rose approximately 30% in that month as markets priced in the removal of a substantial portion of global primary supply. The current disruption differs in two respects: it is geographically concentrated in a chokepoint rather than regulatory in origin, and the physical damage at Al Taweelah introduces a multi-year infrastructure recovery timeline that sanctions-based shocks typically do not generate.

Market participants are already reorienting logistics. Jeddah in Saudi Arabia and the Port of Sohar in Oman have emerged as tactical workaround routes for base metal exports blocked by the Strait closure, with cargo transiting via land bridge to Bahrain and the UAE. Capacity constraints and elevated insurance and freight costs limit throughput via this route. In North America, Century Aluminum accelerated the restart of its Mt. Holly plant in South Carolina. Rio Tinto has reportedly evaluated the resumption of idled capacity at its Tiwai Point facility in New Zealand. Both responses will take quarters to reach volumes that materially offset the Gulf deficit.

European buyers face transit time increases of up to 21 days because of mandatory rerouting around the Cape of Good Hope, lifting Rotterdam regional premiums materially as industrial consumers compete for metal that can no longer exit the Persian Gulf on conventional schedules.

Section 5: Scenarios

What to Watch

The primary variable is the duration and extent of the effective Strait closure, irrespective of how the U.S. blockade declaration is ultimately enforced. EGA has stated that full restoration of Al Taweelah may take up to a year regardless of when hostilities end; that supply is therefore removed from the global balance for much of 2026 under any diplomatic scenario. The more immediate question is whether operations at Qatalum in Qatar and Sohar Aluminium in Oman sustain further reductions, and whether the land-bridge logistics workaround via Jeddah and Sohar can scale sufficiently to partially offset the closed maritime corridor.

LME registered inventory is the most reliable near-term signal available to the market. If stocks continue to decline from their already low base at 418,675 tonnes, cash backwardation will deepen and further validate the structural deficit thesis. A stabilisation or modest recovery in inventory would instead indicate that alternative routing is delivering metal at a rate sufficient to prevent runaway tightening. BMI, a Fitch Group unit, has stated that prices are likely to stay elevated in the coming weeks given the combination of physical scarcity and ongoing conflict.

On the diplomatic track, both sides left Islamabad without a deal but without formally terminating talks. Vice President Vance described the U.S. position as a final and best offer, leaving open the possibility of further engagement. Until either a clear de-escalation signal or a further deterioration in Gulf smelter capacity becomes evident, the market is likely to trade the premium embedded in the current $3,571 price rather than directionally re-rate it.

Disclaimer: This article is for informational purposes only and does not constitute investment advice, a solicitation, or a recommendation to buy or sell any financial instrument. All data sourced from LME, ING, Citi (Reuters), UBS, Goldman Sachs, BMI/Fitch, Fastmarkets, and public financial media as of April 13, 2026. Institutional price targets cited as published and do not constitute endorsement. Past price performance is not indicative of future results.