Board Changes

BOARD CHANGES

In accordance with Listing Rule 6.4.6 R, Antofagasta plc (the "Company") announces that Andrónico Luksic Craig, a Non-Executive Director of the Company since 2013, has resigned from the Board of Directors of the Company (the "Board") with effect from 27 January 2026.

Mr Luksic Craig has not, and will not, receive any loss of office payments, nor will he be paid any further remuneration for his service as a director of the Company, other than that accrued up to 27 January 2026.

The Company also announces that the Board has appointed Andrónico Luksic Lederer as a Non-Executive Director, with effect from 1 March 2026.

Mr Luksic Lederer joined the Company as an employee in 2006 and has been Vice President of Development and a member of the Executive Committee since 2015. Mr Luksic Lederer has resigned from this executive role, with effect from 1 February 2026, to take up a new role as Deputy Chairman of the board of directors of Quiñenco S.A, with responsibility for Investments and Business Development.

Mr Luksic Lederer is currently a member of the board of directors of Compañía de Minas Buenaventura S.A.A. and Quiñenco S.A.

For the purposes of the UK Corporate Governance Code, Mr Luksic Lederer is not considered by the Board to be independent.

Save as disclosed above, there are no further disclosures required under Listing Rule 6.4.8 R in respect of Mr Luksic Lederer.

Mr Jean-Paul Luksic, Chairman of the Company, said: "I would like to thank Andrónico Luksic Craig for the significant contribution he has made to the Board over the past twelve years. We are delighted that Andrónico Luksic Lederer has accepted our invitation to join the Board as a Non-Executive Director. In his previous role as Vice President of Development of the Company he has overseen major strategic transactions and driven significant progress in exploration, leading to the advancement of key projects, and the launch of new exploration activities in Peru. His breadth of experience will be of great benefit to the Company in the years ahead."

Investors - London Media - London

Rosario Orchard [email protected] Sara Powell [email protected]

Robert Simmons [email protected] Ben Brewerton

Telephone +44 20 7808 0988 Nick Hennis

Telephone +44 20 3727 1000

Media - Santiago

Pablo Orozco [email protected]

Carolina Pica [email protected]

Telephone +56 2 2798 7000

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