Aluminium Premiums Slide as Japan’s Q4 Settlement Falls 35%

Japan’s aluminium buyers will pay $255/mt over the London price for metal landing in the October-December quarter. That is 35.44% below the $395/mt they paid in Q3, a decade high. Over the week of 5-9 October, the London Metal Exchange (LME) price fell just 1.7%. Aluminium premiums can collapse while the headline metal price barely moves, and that gap is where the real story sits.

The week ending 17 October 2026 extended the pattern. According to the Shanghai Metals Market (SMM) weekly report, weak demand pushed seller offers lower across Japan, South Korea, Thailand, Vietnam, the US and China. Trading was thin, and buyers and sellers stayed far apart on price.

If you watch only the LME screen, you miss the part of the market where physical buyers are winning the argument. Below is a market-by-market read of what each signal says, and a view on whether this weakness is a passing correction or the start of something that lasts into 2027.

Japan and the premium benchmark: how a $395/mt spike became $255/mt

Quarterly talks for the Main Japan Premium (MJP) are the closest thing the Asian aluminium market has to a reference price. The MJP is the amount Japanese buyers agree to pay above the LME cash price for metal delivered to Japanese ports. In early September, sellers opened at $310/mt, then pitched a second offer at $325/mt, according to Reuters.

Japan’s status as Asia’s aluminium premium benchmark rests on its large import volumes and strict brand preferences, which explains why a single quarterly settlement in Tokyo can reprice offers from Seoul to Yangshan.

Buyers did not bite. By 2 October, the best offer on the table had dropped to $265/mt, valid until 5 October.

Then came the settlement. Platts assessed the Q4 premium at $255/mt on 13 October, based on 10 transactions covering at least 19,500 mt per month for October-December loading.

Quarter-on-quarter reset The Q4 MJP settled 35.44% below Q3, unwinding a decade-high premium in a single quarter.

SMM’s 17 October report still described Japanese activity as muted, with talks dragging and most participants waiting for the quarterly figure before acting. That reads as a picture of the week around settlement rather than a contradiction: spot deals stayed scarce while the benchmark was being fixed and absorbed.

The gap between a $325/mt ask and a $255/mt outcome tells you sellers lost pricing power fast once disruption fears faded. A premium built on scarcity can be unwound in one negotiating round.

Even so, Japan still sits well above the $195/mt Main Asian Ports figure. Japanese buyers prefer Good Western-origin metal, while the wider region accepts a broader range of brands, so the benchmark keeps a floor that other Asian markets lack.

Korea, Thailand, Vietnam, the US and Yangshan: five markets, one weak-demand story

Japan set the tone. The surrounding markets showed the same buyer reluctance, each in its own form. One caution first: October reports gave direction only, with no absolute premium levels for Korea, Thailand, Vietnam or Yangshan.

South Korea and Thailand

Korean offers kept falling in what SMM described as a disorderly market, with the price centre expected to drift lower still. Supply came from a complex mix of origins, ingot quotes varied widely, and buyers pushed hard enough that deals stalled.

Thailand briefly looked different. Offers rebounded the previous week, then slipped again from the start of this one. With orders absent, the bounce proved to be short-term sentiment without demand behind it.

Vietnam and the United States

Vietnam’s problem is thin participation. SMM’s Vietnam P1020A premium index fell $3/mt on 16 October, trader participation declined and end-user buying slowed.

The US market was stagnant. A few higher-priced cargoes traded, but in volumes too small to shift anything, and buyers purchased only for immediate needs. The Midwest premium stood at about $2,312/mt, according to Reuters via Crux Investor on 14 October, a level that reflects the 50% tariff on Canadian imports as much as physical tightness.

Midwest premium dynamics are driven by trade policy and North American logistics as much as by physical tightness, which is why the US can stay elevated while Asian premiums slide on weak demand.

China (Yangshan)

At Yangshan, China’s bonded import hub, suppliers cut both US dollar and renminbi quotes. Inquiries were few and suppliers faced mounting shipment pressure, so they lowered prices repeatedly. A double cut signals sellers chasing any buyer willing to commit.

The weakness is not uniform. CRU, which put its Asia CIF benchmark at $202/mt on 25 September, found Korea, Malaysia and Taiwan under the greatest pressure, while Thailand and Vietnam held comparatively firmer because they rely more heavily on imports. If you track Asian premiums, Korea and Yangshan give you the earliest read on whether weakness is spreading.

Why aluminium premiums are weakening: demand, Chinese exports and a supply wave

So what is a premium actually paying for, and why is that value draining away?

What a premium is

An aluminium premium is the charge buyers pay above the LME price to get physical metal of a specific brand, delivered to a specific location. The LME price covers the metal itself; the premium covers getting the right metal to the right port. Japan’s MJP is the example: $255/mt on top of the LME cash price for Q4 deliveries.

The four drivers

• Buyer coverage and waiting: Japanese consumers were already supplied under existing contracts, and the long MJP talks encouraged wait-and-see behaviour across Asia.
• Backwardation: The LME curve was in backwardation, meaning near-term metal priced above later-dated metal, which made holding stock costly and kept buyers purchasing only what they needed.
• Chinese exports: China’s July unwrought aluminium and semis exports reached 643,000 mt, up 18.6% year-on-year, with January-July shipments at 4.04 million mt, up 16.7%.
• New supply: Emirates Global Aluminium has restarted about 25% of its 1.6 million mt/year Al Taweelah smelter ahead of schedule, and S&P Global Energy Horizons forecasts Indonesia’s potential capacity rising 104% to 4.61 million mt/year by 2027, though timing is uncertain.

Meanwhile, the LME price closed the week of 5-9 October at $3,048.50/mt, down $52, with LME stocks at 238,875 mt. Falling visible stocks alongside rising Chinese export supply tells you headline tightness no longer guarantees pricing power for sellers outside China.

The banks are pricing the same shift.

Demand-side causes such as buyer coverage can reverse quickly. Supply-side causes, from Chinese exports to Indonesian capacity, look more likely to persist into 2027. Forecasts are subject to market conditions and may change; past performance does not guarantee future results.

Cyclical correction or structural overhang? What it means for investors

Two readings compete. The cyclical case says Q3’s $395/mt was an exceptional spike inflated by Middle Eastern disruption fears, so the Q4 fall is partly normalisation. The structural case points to Chinese exports, Indonesian capacity, Middle Eastern restarts and Citi’s forecast 2027 surplus.

Most likely reading Cyclical weakness amplified by an emerging structural supply overhang.

That blend has different consequences depending on where you sit. Producers selling into high-premium Japan and Korea face margin pressure, while fabricators and consumers benefit from cheaper ex-China metal. US buyers remain exposed to tariff costs; the Midwest premium eased from a June record of $1.19/lb to $1.09/lb on expectations the tariff could be cut to 25%.

Several risks could break the trend:

• Renewed supply disruption, the main upside risk, which could quickly reverse the Q4 decline.
• Chinese downstream restocking, with Shanghai Futures Exchange stocks down 57,244 mt (7.8%) from the 30 September report.
• US tariff policy changes, where a reversal could lift the Midwest premium again.
• Unusable visible stock, since much remaining LME metal is reported as Russian-origin and not freely usable for every buyer.

Treat falling regional premiums and tight deliverable stocks as separate signals. One can weaken while the other keeps the downside limited.

Record-low LME inventories sit awkwardly beside forecasts of a coming surplus, and that tension is why tight visible stock may limit the downside even as regional premiums weaken.

What to watch as Q4 premiums settle in

Japan’s reset set the tone, the surrounding markets confirmed it with differing intensity, and the causes point to normalisation layered on a growing supply overhang. Whether that blend tips further toward weakness depends on a short list of indicators:

1. Korean uptake of cheap cargoes and any shift in buyer acceptance.
2. Vietnamese end-user demand, which has gone quiet.
3. Yangshan quote direction in both US dollars and renminbi.
4. Any new supply disruption in the Middle East or elsewhere.

If these stay soft, the case for lower Q1 2027 premiums strengthens. If two or more turn, the floor set by tight deliverable stock matters more than the regional slide.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions.