INDENTURE dated as of March 17, 2025, among ALUMINA PTY LTD (ABN 85 004 820 419), a
proprietary company limited by shares incorporated in Australia and registered in Victoria, Australia (the Issuer), ALCOA CORPORATION (the Company), a Delaware corporation, the SUBSIDIARY GUARANTORS party hereto
and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as the Trustee.
Each party agrees as follows for the benefit of the other parties
and for the equal and ratable benefit of the holders of (a) the Issuers 6.125% Senior Unsecured Notes due 2030 (the 2030 Notes and, as issued on the Issue Date, the Original 2030 Notes), (b) the
Issuers 6.375% Senior Unsecured Notes due 2032 (the 2032 Notes and, as issued on the Issue Date, the Original 2032 Notes; the Original 2032 Notes together with the Original 2030 Notes, the
Original Notes) and (c) any Additional Notes (as defined herein) that may be issued (all such Notes in clauses (a), (b) and (c) being referred to collectively as the Notes).
ARTICLE 1.
DEFINITIONS AND
INCORPORATION BY REFERENCE
SECTION 1.1 Definitions.
Additional Notes means Notes issued under this Indenture after the Issue Date and in compliance with Section 2.15.
Affiliate means, when used with respect to a specified Person, another Person that directly, or indirectly through one
or more intermediaries, Controls or is Controlled by or is under common Control with the Person specified.
Amended Credit
Agreements means the Amended Revolving Credit Agreement and the Amended Japanese Yen Revolving Credit Facility.
Amended Japanese Yen Revolving Credit Facility means the revolving credit facility agreement, entered into on
April 28, 2023, as amended as of January 17, 2024 and as amended as of April 26, 2024, in each case among the Company, ANHBV, the lenders party thereto from time to time and Sumitomo Mitsui Banking Corporation, as administrative
agent, as the same may be amended, restated, modified, renewed, refunded, replaced or refinanced in whole or in part from time to time (including replacing the borrowers or increasing the amount loaned thereunder), including to add the New
Subsidiary Guarantees.
Amended Revolving Credit Agreement means the Revolving Credit Agreement dated as of
September 16, 2016, as amended as of October 26, 2016, as amended and restated as of November 14, 2017, as amended and restated as of November 21, 2018, as amended as of August 16, 2019, as amended as of April 21, 2020,
as amended as of June 24, 2020, as amended as of March 4, 2021, as amended and restated on June 27, 2022 (the Original Revolving Credit Agreement) and as amended as of January 17, 2024, in each case with a syndicate
of lenders and issuers named therein, and JPMorgan Chase Bank, N.A., as administrative agent, as the same may be amended, restated, modified, renewed, refunded, replaced or refinanced in whole or in part from time to time (including replacing the
borrowers or increasing the amount loaned thereunder), including to add the New Subsidiary Guarantees.