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RESULTS OF 2026 ANNUAL GENERAL MEETING
Antofagasta PLC announced the results of its 2026 Annual General Meeting, where all resolutions were passed by a significant majority of shareholders. Key resolutions included the adoption of the 2025 Annual Report and Financial Statements with 1,104,043,653 votes for and 35,202 against, and the approval of the 2025 Remuneration Report with 1,081,551,379 votes for and 25,827,484 against. The company also received strong support for the re-election of directors, the declaration of a final dividend, and the re-appointment of Deloitte LLP as auditors. Resolutions concerning the allotment of securities and the purchase of own shares also passed, indicating shareholder confidence in the company's governance and operational authorities. Disclaimer*

About this update from Antofagasta Plc
ANTOFAGASTA PLC RESULTS OF 2026 ANNUAL GENERAL MEETING At today's Annual General Meeting, a poll was held on each of the resolutions proposed in the Notice of Meeting dated 19 March 2026. The results of the polls are: Resolution Votes For Votes Against Votes Cast as % of Issued Share Capital Votes withheld (1) Adopt the 2025 Annual Report and Financial Statements 1,104,043,653 35,202 93.10% 3,350,852 100.00% 0.00% (2) Approve the 2025 Remuneration Report 1,081,551,379 25,827,484 93.38% 50,844 97.67% 2.33% (3) Approve the 2026 Remuneration Policy 1,045,808,029 61,551,232 93.38% 70,446 94.44% 5.56% (4) Declare a final dividend 1,106,705,353 707,524 93.39% 16,830 99.94% 0.06% (5) Re-elect Jean-Paul Luksic as a Director 994,995,827 110,417,813 93.22% 2,016,067 90.01% 9.99% (6) Re-elect Francisca Castro as a Director 1,069,407,116 37,998,825 93.38% 23,766 96.57% 3.43% 238,754,986 * 37,998,825 * 86.27% * 13.73% * (7) Re-elect Ramón Jara as a Director 1,071,239,875 36,165,789 93.38% 24,043 96.73% 3.27% (8) Re-elect Juan Claro as a Director 1,095,198,897 12,206,760 93.38% 24,050 98.90% 1.10% (9) Re-elect Michael Anglin as a Director 1,105,714,064 1,691,817 93.38% 23,826 99.85% 0.15% 275,061,934 * 1,691,817 * 99.39% * 0.61% * (10) Re-elect Tony Jensen as a Director 1,094,397,536 13,008,353 93.38% 23,818 98.83% 1.17% 263,745,406 * 13,008,353 * 95.30% * 4.70% * (11) Re-elect Eugenia Parot as a Director 1,104,878,821 1,709,632 93.32% 841,254 99.85% 0.15% 274,226,691 * 1,709,632 * 99.38% * 0.62% * (12) Re-elect Heather Lawrence as a Director 1,105,718,597 1,687,333 93.38% 23,777 99.85% 0.15% 275,066,467 * 1,687,333 * 99.39% * 0.61% * (13) Re-elect Tracey Kerr as a Director 1,105,747,308 1,657,750 93.38% 24,649 99.85% 0.15% 275,095,178 * 1,657,750 * 99.40% * 0.60% * (14) Elect Ignacio Bustamante as a Director 1,106,851,814 554,250 93.38% 23,643 99.95% 0.05% 276,199,684 * 554,250 * 99.80% * 0.20% * (15) Elect Andrónico Luksic as a Director 1,105,767,241 1,645,871 93.39% 16,595 99.85% 0.15% (16) Re-appoint Deloitte LLP as auditors 1,107,372,513 39,985 93.39% 17,209 100.00% 0.00% (17) Authorise the Audit and Risk Committee to fix the auditor's remuneration 1,106,995,566 416,952 93.39% 17,189 99.96% 0.04% (18) Grant Directors authority to allot securities 1,087,827,057 19,571,976 93.38% 30,674 98.23% 1.77% (19) Grant Directors authority to allot securities for cash other than on a pro rata basis to shareholders 1,073,267,464 34,122,314 93.38% 39,929 96.92% 3.08% (20) Grant Directors authority to allot securities for cash other than on a pro rata basis to shareholders for the purposes of an acquisition or specified capital investment 1,062,855,018 44,534,967 93.38% 39,722 95.98% 4.02% (21) Authorise purchase of own shares 1,101,887,578 5,106,085 93.35% 436,044 99.54% 0.46% (22) Permit general meetings to be called on not less than 14 days' clear notice 1,088,998,489 18,413,899 93.39% 17,319 98.34% 1.66% * Result of the votes cast by shareholders excluding the controlling shareholders. Notes to the poll results 1. Any proxy votes that were at the discretion of the Chairman are included in the total of "votes for" each resolution. 2. Percentages of votes for and votes against each resolution are included on the basis of votes cast and therefore exclude abstentions. 3. The Company had in issue 985,856,695 Ordinary Shares carrying one vote each, and 2,000,000 5% Cumulative Preference Shares carrying 100 votes each. Accordingly, the total number of votes available was 1,185,856,695 votes and the total number of votes available excluding the controlling shareholders was 350,086,090 votes at the Annual General Meeting. 4. "Votes Cast as % of Issued Share Capital" represents the percentage of votes cast as a percentage of all votes that could have been cast on the resolution. These results have been published on the Company's website ( www.antofagasta.co.uk ). In accordance with Listing Rule 6.4.2, copies of resolutions 18, 19, 20, 21 and 22 passed at the Annual General Meeting will be submitted to the National Storage Mechanism today and will shortly be available for inspection at https://www.fca.org.uk/markets/primary-markets/regulatory-disclosures/national-storage-mechanism . 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 Register on our website to receive our email alerts at the following address: https://www.antofagasta.co.uk/investors/news/email-alerts/