X0607 3 2026-03-18 0 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 Ordinary Shares 6889701 D American Depositary Shares Ordinary Shares 292800 D Includes 375,924 Ordinary Shares underlying time-based units ("Units") that vest on July 1, 2026, 588,290 Ordinary Shares underlying Units that vest on July 1, 2027, 1,608,059 Ordinary Shares underlying Units that vest on January 1, 2029 and 1,027,522 Ordinary Shares underlying Units that vest on July 1, 2026. 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 7,320 American Depositary Shares. /s/ Chad Yeftich 2026-03-18