X0609 4 2026-07-01 0001896084 ioneer Ltd IONR 0002115527 Nagai Yoshio false C/O IONEER LTD 9460 DOUBLE R. BLVD, SUITE 200 RENO NV 85921 true VP Comm. Sales & Marketing false Ordinary Shares 2026-07-01 4 A 0 159982 A 8095472 D This amount includes 159,982 ordinary shares underlying performance units held by the Reporting Person. On July 1, 2026, 159,982 performance units were converted into the right to receive 159,982 ordinary shares. Exhibit 24.1 - Power of Attorney /s/ April Hashimoto as Attorney-in-Fact for Yoshio Nagai 2026-07-06