58 lawmakers seek probe into U.S. aluminum premium
Key Facts
On August 6, 58 U.S. lawmakers sent Commerce Secretary Howard Lutnick a request for an investigation into the Midwest aluminum premium, according to an Argus report. The premium is used to price primary aluminum, scrap and other products, making the proposed investigation relevant to a local price benchmark that affects more than one product category. The Commodity Futures Trading Commission says the premium represents the regional differential for aluminum delivered to the Midwest, the main pricing point in the United States. Platts and Harbor Aluminum publish daily assessments of this differential, according to the commission’s report. The lawmakers linked their request to the impact of tariffs on imports, but available sources do not establish that the department announced a plan to reform the pricing mechanism or has begun an investigation.
The Argus report said the request linked the premium to the cost of a 50% tariff on aluminum imports under Section 232, as reported on August 20, 2026. The report said domestic consumers bear the impact of the tariff when the metal is priced. That matters in the debate over the Midwest premium because it is added to the benchmark price for aluminum delivered to the region, in line with the Commodity Futures Trading Commission’s description of the premium as a regional differential. The published facts here, however, are limited to the lawmakers’ request and the link they drew between tariffs and the premium. They do not include details about the scope of the requested investigation, a response from the Commerce Department or any proposals to change how the premium is calculated.
The request follows the Midwest premium reaching a record level earlier in the year. The Platts assessment topped $1 per pound for the first time on January 23, 2026, reaching $1.0095 per pound on top of the London Metal Exchange cash price for delivery to the Midwest, according to S&P Global data. That reflects the premium at that specific session and is not a new price for November 13. S&P Global also reported, citing the International Trade Administration, that U.S. imports of unwrought, unalloyed aluminum fell 25% year over year in 2025. Import and premium data provide background on a market that has seen shifts in supply and costs, without by themselves establishing a specific cause for the premium’s level or an outcome of the investigation sought by lawmakers.
In a separate development concerning pricing benchmarks, Platts said on October 16, 2026, that it would launch a calculated daily assessment of the U.S. aluminum transaction premium based on the Chicago exchange settlement, effective December 1. The new assessment applies to P1020A aluminum, according to a Platts notice. The company said the assessment would complement its existing Midwest aluminum transaction premium assessment, while the methodology and specifications of the existing assessment would remain unchanged. The notice gives a specific launch date for the new assessment but does not link it to the lawmakers’ request for an investigation into the premium. The available evidence does not specify a timetable for a Commerce Department investigation or any subsequent regulatory steps.