Ioneer's top three insider shareholders as of September 29, 2026 are Matthew Weaver (Svp Of Engineering Operations, 11.30Mn shares), Yoshio Nagai (Vp Comm. Sales Marketing, 8.10Mn shares), Chad Yeftich (Vp Corp Dev External Affairs, 6.39Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Matthew Weaver | Svp Of Engineering Operations | 11,299,711 | 0 | 11,299,711 | 37.4% | 07 Jul, 2026 |
| 2 | Yoshio Nagai | Vp Comm. Sales Marketing | 8,095,472 | 0 | 8,095,472 | 26.8% | 06 Jul, 2026 |
| 3 | Chad Yeftich | Vp Corp Dev External Affairs | 6,386,671 | 0 | 6,386,671 | 21.1% | 07 Jul, 2026 |
| 4 | Kenneth D Coon | Vice President Human Resources | 3,475,989 | 0 | 3,475,989 | 11.5% | 07 Jul, 2026 |
| 5 | Timothy Roy Woodall | Director | 963,083 | 0 | 963,083 | 3.2% | 25 Mar, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 02 Jul, 2026 | Matthew Weaver | Svp Of Engineering Operations | Disposed S | 251,293 | $0.11 | $27.64K | 11,299,711 | Direct |
| 02 Jul, 2026 | Chad Yeftich | Vp Corp Dev External Affairs | Disposed S | 706,781 | $0.11 | $77.75K | 6,386,671 | Direct |
| 02 Jul, 2026 | Kenneth D Coon | Vice President Human Resources | Disposed S | 113,899 | $0.11 | $12.53K | 3,475,989 | Direct |
| 01 Jul, 2026 | Matthew Weaver | Svp Of Engineering Operations | Acquired A | 391,277 | — | — | 11,551,004 | Direct |
| 01 Jul, 2026 | Yoshio Nagai | Vp Comm. Sales Marketing | Acquired A | 159,982 | — | — | 8,095,472 | Direct |
| 01 Jul, 2026 | Chad Yeftich | Vp Corp Dev External Affairs | Acquired A | 203,751 | — | — | 7,093,452 | Direct |
| 01 Jul, 2026 | Kenneth D Coon | Vice President Human Resources | Acquired A | 150,926 | — | — | 3,589,888 | Direct |
| 24 Mar, 2026 | Timothy Roy Woodall | Director | Acquired P | 200,000 | $0.11 | $21.60K | 963,083 | Direct |