Alcoa Files Form S-4 to Register 17.0M Shares for Acquisition of South32 Assets

Executive Summary

On September 1, 2026, Alcoa Corporation filed a Form S-4 Registration Statement with the SEC in connection with its previously announced agreement to acquire South32 Limited's equity interests in bauxite mine, alumina refinery, and selected aluminum smelter operations (collectively referred to as AliGroup).

Deal Structure & Consideration Terms

Under the Umbrella Implementation Deed dated June 30, 2026:

• Cash Consideration: $3.1 billion in cash at completion (subject to customary locked-box and leakage adjustments).
• Stock Consideration: Issuance of 17,008,960 shares of Alcoa common stock (or Alcoa CHESS Depositary Interests / CDIs), representing approximately 6% of Alcoa's outstanding common stock prior to distribution.
• Contingent Value Right (CVR): Up to $750 million in additional cash, payable over four consecutive annual periods commencing July 1, 2026, contingent upon alumina and aluminum benchmark market prices exceeding agreed strike levels.
• Shareholder Distribution: South32 plans to distribute at least half of the received Alcoa stock consideration directly to its shareholders via an in-specie dividend distribution (resulting in South32 shareholders owning ~3%+ of Alcoa), with the remainder either sold in an orderly manner or distributed via capital reduction.

Strategic and Market Implications

• Consolidation: Expands and consolidates Alcoa's global upstream position in bauxite mining, alumina refining, and smelting operations.
• Dilution: The transaction represents moderate share dilution (~6%), substantially funded through a mix of debt/cash ($3.1B) and equity.
• Approvals Required: Requires South32 shareholder approval at the upcoming South32 Transaction Meeting, along with requisite antitrust and regulatory clearances across Australia, Brazil, and South Africa.