X0607 3 2026-03-18 0 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 Ordinary Shares 7935490 D Includes 196,780 Ordinary Shares underlying time-based units ("Units") that vest on July 1, 2026, 457,738 Ordinary Shares underlying Units that vest on July 1, 2027, 834,135 Ordinary Shares underlying Units that vest on January 1, 2029 and 599,576 Ordinary Shares underlying Units that vest on September 1, 2026. /s/ Yoshio Nagai 2026-03-18