News & Market Analysis: Alcoa To Acquire South32 Aluminium Assets In Up To $5.6 Billion Deal

Alcoa Corporation has agreed to acquire South32's entire aluminium value chain for an implied enterprise value of up to $5.6 billion in a deal that represents one of the largest consolidations in the global aluminium industry in years and significantly expands Alcoa's integrated bauxite, alumina and smelting footprint.

Under the binding conditional agreement signed on 1 July, Alcoa will acquire South32's 86% interest in Worsley Alumina in Western Australia, 100% of Hillside Aluminium in South Africa, a 33% stake in the MRN bauxite mine in Brazil, and stakes of 36% and 40% respectively in Brazil Alumina and Brazil Aluminium.

Mozal Aluminium, currently on care and maintenance, is excluded from the transaction and remains under active divestment consideration.

The consideration comprises $3.1 billion in upfront cash, $1.0 billion in Alcoa shares representing approximately 6% of Alcoa's issued capital, around $750 million in net debt and lease liabilities to be assumed by Alcoa, and up to $750 million in contingent cash consideration linked to aluminium and alumina prices through to 2030.

Alcoa will also assume rehabilitation provisions of approximately $1.2 billion. The transaction is subject to a locked-box mechanism with an economic effective date of 1 April 2026, and Alcoa will pay South32 a ticking fee of 5.0% per annum on the $3.1 billion cash consideration from the date of shareholder approval to completion. Completion is expected in H2 FY2027, subject to regulatory approvals including South32 shareholder approval, FIRB, ACCC and South African competition clearance.

The deal is strategically significant for both parties. For Alcoa, the Worsley Alumina acquisition is immediately complementary to its existing Kwinana and Pinjarra refinery operations in Western Australia, creating material scale and logistics synergies in a region where Alcoa already secured a long-term gas supply agreement with Woodside this week. For South32, the transaction accelerates a strategic pivot toward base and precious metals, with the company's pro-forma EBITDA shifting to approximately 85% from copper, zinc, silver and lead. South32 anticipates overhead savings of approximately $125 million per annum once the simplified structure is fully implemented, and will distribute half of the Alcoa shares received, worth around $500 million at current market values, to shareholders as a fully-franked special dividend on completion.

“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," Inaugural South32 Chief Executive Officer Graham Kerr, said.