X0607 3 2026-03-18 0 0001896084 ioneer Ltd IONR 0002119273 Walker Margaret R C/O IONEER LTD 9460 DOUBLE R. BLVD, SUITE 200 RENO NV 85921 true Ordinary Shares 990343 D American Depositary Shares Ordinary Shares 353120 D Includes 188,103 Ordinary Shares underlying time-based units that vest on November 2, 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 8,828 American Depositary Shares. /s/ Margaret R Walker 2026-03-18