EXHIBIT 99.12 Notice to ASX/LSE Shareholdings of persons discharging managerial responsibility (PDMR) / Key Management Personnel (KMP) 26 April 2024 As part of its dual listed company structure, Rio Tinto notifies dealings in Rio Tinto plc and Rio Tinto Limited securities by PDMRs / KMPs to both the Australian Securities Exchange (ASX) and the London Stock Exchange (LSE). Rio Tinto plc Dividend Reinvestment Plan Rio Tinto plc offer a dividend reinvestment plan that gives shareholders the opportunity to use their cash dividends to buy Rio Tinto plc shares in the market. On 18 April 2024, the following director acquired shares in Rio Tinto plc under a dividend reinvestment plan as follows. Security Name of PDMR / KMP Number of Shares Acquired Price Per Share USD Rio Tinto plc ADR Nason, Jennifer 67 67.528866 FCA notifications in accordance with the EU Market Abuse Regulation have been issued to the London Stock Exchange contemporaneously with this release. LEI: 213800YOEO5OQ72G2R82 Classification: 3.1. Information disclosed under article 19 of the Market Abuse Regulation.

Notice to ASX/LSE 2 / 2 Contacts Please direct all enquiries to media.enquiries@riotinto.com 0BMedia Relations, 1BUnited Kingdom Matthew Klar M +44 7796 630 637 David Outhwaite M +44 7787 597 493 2BMedia Relations, 3BAustralia Matt Chambers M +61 433 525 739 Jesse Riseborough M +61 436 653 412 Alyesha Anderson M +61 434 868 118 Michelle Lee M +61 458 609 322 4BMedia Relations, 5BAmericas Simon Letendre M +1 514 796 4973 Malika Cherry M +1 418 592 7293 Vanessa Damha M +1 514 715 2152 6BInvestor Relations, 7BUnited Kingdom David Ovington M +44 7920 010 978 Laura Brooks M +44 7826 942 797 8BInvestor Relations, 9BAustralia Tom Gallop M +61 439 353 948 Amar Jambaa M +61 472 865 948 10BRio Tinto plc 6 St James’s Square London SW1Y 4AD United Kingdom T +44 20 7781 2000 Registered in England No. 719885 11BRio Tinto Limited Level 43, 120 Collins Street Melbourne 3000 Australia T +61 3 9283 3333 Registered in Australia ABN 96 004 458 404 This announcement is authorised for release to the market by Andy Hodges, Rio Tinto’s Group Company Secretary. riotinto.com