Major aluminum producers have raised their U.S. premiums on semi-finished products by about 12%, a significant move reflecting their strong pricing power in a strained market.
This price hike stands on what can be described as a three-legged stool: recently tightened U.S. tariffs, severe supply disruptions from the Middle East, and an already high domestic price benchmark. Let's look at each of these factors.
First, U.S. trade policy has become a major catalyst. On April 2, 2026, the White House issued a new proclamation under Section 232, effectively increasing the cost of imported aluminum. By applying a 50% tariff to the full customs value of most aluminum products and narrowing exemptions, the policy gives domestic producers like Rio Tinto and Century Aluminum more room to raise their own prices without being undercut by imports.
Second, the global supply chain is under significant pressure. Conflict in the Middle East since early March has disrupted shipping through the critical Strait of Hormuz. In response, major smelters like Aluminium Bahrain (Alba) and Qatalum have been forced to cut production. This supply shock has had ripple effects globally, pushing Japan's quarterly aluminum premium to an 11-year high. When Asia's benchmark rises, it limits the availability of metal for other regions and supports higher prices in the U.S.
Third, these new pressures are being added to a market that was already tight. The U.S. Midwest Premium (MWP), a key benchmark for the delivered cost of aluminum in North America, had already hit record highs in late 2025 and early 2026. Producers are now adding their Value-Added Premium (VAP) hikes on top of this elevated base, amplifying the cost increase for buyers.
Supporting this trend is a combination of reduced domestic supply capacity—with Century Aluminum recently selling its idled Hawesville smelter—and steady demand from sectors like data center construction.
In short, the 12% premium increase is a direct consequence of a perfect storm of policy changes, geopolitical supply risks, and pre-existing market tightness. For now, this gives aluminum producers a firm upper hand in price negotiations.
- Midwest Premium (MWP): A surcharge paid on top of the London Metal Exchange (LME) aluminum price for physical delivery in the U.S. Midwest region. It reflects regional supply, demand, and logistics costs.
- Section 232: A U.S. trade law that allows the president to impose tariffs on imports if they are deemed a threat to national security.
- Value-Added Premium (VAP): An additional charge for aluminum that has been processed into specific shapes or alloys (like billets or slabs) beyond the basic primary ingot.