X0609 4 2026-07-01 0001896084 ioneer Ltd IONR 0002115513 Yeftich Chad false C/O IONEER LTD 9460 DOUBLE R. BLVD, SUITE 200 RENO NV 85921 true VP Corp Dev & External Affairs false Ordinary Shares 2026-07-01 4 A 0 203751 A 7093452 D This amount includes 203,751 ordinary shares underlying performance units held by the Reporting Person. On July 1, 2026, 203,751 performance units were converted into the right to receive 203,751 ordinary shares. Exhibit 24.1 - Power of Attorney /s/ April Hashimoto as Attorney-in-Fact for Chad Yeftich 2026-07-06