Alcoa Corporation

Item 8.01 Other Events. On September 10, 2026 Australian Western Standard Time, South32 Limited (“South32”) released a notice of meeting and explanatory memorandum (collectively, the “Notice”) to convene a general meeting of South32 shareholders at which, among other things, such shareholders will vote on a resolution to approve the proposed sale of South32’s interests in certain bauxite, alumina and aluminum operations to Alcoa Corporation (“Alcoa”) pursuant to the Umbrella Implementation Deed, dated as of June 30, 2026, by and among, inter alios, Alcoa and South32. A copy of the Notice, which will be distributed to South32 shareholders alongside Alcoa’s prospectus filed with the Securities and Exchange Commission (“SEC”) on September 8, 2026, is attached hereto as Exhibit 99.1 and is incorporated by reference into this Item 8.01. The Notice includes certain disclosures in respect of mineral resources and reserves that were declared and disclosed as part of South32’s annual Resource and Reserve (R&R) declaration in its 2026 Annual Report dated August 27, 2026 in compliance with the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves 2012. Such disclosures do not comply with Subpart 1300 of Regulation S-K, which governs disclosures of mineral reserves in certain filings with the SEC, and therefore have been omitted from Exhibit 99.1. Certain information relating to the South32 general meeting but not the vote by the South32 shareholders on the resolution to approve the proposed sale of South32’s interests in certain bauxite, alumina and aluminum operations to Alcoa has also been omitted from Exhibit 99.1.