Alcoa to acquire South32 aluminium assets for up to $5.6 billion

Deal structure

South32 has agreed to sell most of its aluminium assets to Alcoa for an implied enterprise value of up to $5.6 billion. The total comprises $3.1 billion in cash, $1 billion in Alcoa shares, $750 million of net debt and lease liabilities to be assumed by the buyer, and $750 million of future cash payments contingent on aluminium prices, according to statements from both companies. Alcoa will also take over rehabilitation provisions of around $1.2 billion. The transaction is expected to close in the second half of 2027.

This transaction will unlock significant value for shareholders and repositions South32 as a leading upstream base metals-focused company with high-margin assets and transformational growth.

Assets and geographic reach

The acquired interests span three continents. They include the Worsley Alumina operation in Australia, Hillside Aluminium in South Africa, the MRN bauxite mine in Brazil, the Brazil Alumina refinery (Alumar) and the Brazil Aluminium smelter. Alcoa already operates the Alumar refinery and the Brazil Aluminium smelter. The deal is expected to boost Alcoa’s alumina output by more than 50 percent and its smelting capacity by more than a third.

We are acquiring assets that are in our sweet spot.

Market backdrop

Aluminium prices hit a four-year high of more than $3,787 a tonne on June 2, driven by the war in the Middle East, which accounts for roughly one-tenth of global production. Prices have pulled back since the US and Iran struck a tentative peace deal two weeks ago, but Alcoa’s chief executive told the FT the market would get tighter and it could take up to 12 months for global output to return to prewar levels.

We entered 2026 in aluminium deficit, that led to higher prices - and then the conflict exacerbated the high prices.

Financial rationale and leadership

Alcoa projects around $900 million in net present value of synergies through operational optimisation across the complementary assets. For South32, the sale will simplify its portfolio and reduce overhead costs by an anticipated US$125 million per year, according to incoming CEO Matthew Daley, who assumed the role on July 1, the day the deal was announced. Daley replaces Graham Kerr, who led the company since its spin-out from BHP in 2015.

Our business will be simpler with a portfolio of higher margin upstream operations, reduced complexity and greater resilience. This will enable a leaner, lower-cost operating model that will deliver ongoing value through an anticipated US$125M per annum reduction in overhead costs as new support structures are implemented.