X0609 4 2026-07-01 0001896084 ioneer Ltd IONR 0002114909 Weaver Matthew false C/O IONEER LTD 9460 DOUBLE R. BLVD, SUITE 200 RENO NV 85921 true SVP of Engineering Operations false Ordinary Shares 2026-07-01 4 A 0 391277 A 11551004 D This amount includes 391,277 ordinary shares underlying performance units held by the Reporting Person. On July 1, 2026, 391,277 performance units were converted into the right to receive 391,277 ordinary shares. Exhibit 24.1 - Power of Attorney /s/ April Hashimoto as Attorney-in-Fact for Matthew M. Weaver 2026-07-06