X0607 3 2026-03-18 0 0001896084 ioneer Ltd IONR 0002115562 Coon Kenneth D false C/O ioneer Ltd 9460 Double R. Blvd, Suite 200 Reno NV 85921 true Vice President Human Resources Ordinary Shares 3438962 D American Depositary Shares Ordinary Shares 1778040 D Includes 185,642 Ordinary Shares underlying time-based units ("Units") that vest on July 1, 2026, 431,950 Ordinary Shares underlying Units that vest on July 1, 2027 and 787,141 Ordinary Shares underlying Units that vest on January 1, 2029. Each American Depositary Share is convertible at any time, at the holder's election, into 40 ordinary shares of the issuer. The American Depositary Shares have no expiration date. Represented by 44,451 American Depositary Shares. /s/ Kenneth D Coon 2026-03-19