Terrestrial Energy's top three insider shareholders as of September 29, 2026 are Shawn Matthews (Director, 2.75Mn shares), Shawn Matthews (Director, 533.51K shares), Jacob Loveless (Other, 25.00K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Shawn Matthews | Director | 0 | 2,755,000 | 2,755,000 | 97.3% | 13 Nov, 2025 |
| 2 | Jacob Loveless | Other | 25,000 | 0 | 25,000 | 0.9% | 30 Oct, 2025 |
| 3 | Michael J Connor | Other | 25,000 | 0 | 25,000 | 0.9% | 30 Oct, 2025 |
| 4 | Andrew Scott Brenner | Other | 25,000 | 0 | 25,000 | 0.9% | 30 Oct, 2025 |
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 |
|---|---|---|---|---|---|---|---|---|
| 29 Jul, 2026 | Pamela Beth Cowan | Evp, Engineering | Acquired A | 299,401 | $0.00 | $0 | 299,401 | Direct |
| 23 Jul, 2026 | Kathryn Ann Mccarthy | Director | Acquired A | 2,049 | $0.00 | $0 | 2,049 | Direct |
| 12 Apr, 2026 | Steven M. Millsap | General Counsel | Acquired A | 49,917 | $0.00 | $0 | 49,917 | Direct |
| 12 Apr, 2026 | Brian Patrick Thrasher | Chief Financial Officer | Acquired A | 49,917 | $0.00 | $0 | 49,917 | Direct |
| 12 Apr, 2026 | William F. Smith | Chief Operating Officer | Acquired A | 32,787 | $0.00 | $0 | 32,787 | Direct |
| 12 Apr, 2026 | Brian Patrick Thrasher | Chief Financial Officer | Acquired A | 58,236 | $0.00 | $0 | 58,236 | Direct |
| 12 Apr, 2026 | David Michael Leblanc | Chief Technology Officer | Acquired A | 32,787 | $0.00 | $0 | 32,787 | Direct |
| 18 Dec, 2025 | William D Johnson | Director | Acquired A | 1,029 | $0.00 | $0 | 6,894 | Direct |
| 18 Dec, 2025 | David John Hill | Director | Acquired A | 3,352 | $0.00 | $0 | 3,352 | Direct |
| 18 Dec, 2025 | Frederick W Buckman | Director | Acquired A | 6,703 | $0.00 | $0 | 6,703 | Direct |
| 18 Dec, 2025 | William D Johnson | Director | Acquired A | 5,865 | $0.00 | $0 | 5,865 | Direct |
| 18 Dec, 2025 | Robert Wood Jones | Director | Acquired A | 5,865 | $0.00 | $0 | 5,865 | Direct |
| 18 Dec, 2025 | Charles G Pardee | Director | Acquired A | 5,027 | $0.00 | $0 | 5,027 | Direct |
| 18 Dec, 2025 | Shawn Matthews | Director | Acquired A | 4,190 | $0.00 | $0 | 4,190 | Direct |
| 18 Dec, 2025 | John Hugh Macdiarmid | Director | Acquired A | 5,865 | $0.00 | $0 | 5,865 | Direct |
| 18 Dec, 2025 | Robert Wood Jones | Director | Acquired A | 1,029 | $0.00 | $0 | 6,894 | Direct |
| 18 Dec, 2025 | Charles G Pardee | Director | Acquired A | 882 | $0.00 | $0 | 5,909 | Direct |
| 18 Dec, 2025 | Shawn Matthews | Director | Acquired A | 735 | $0.00 | $0 | 4,925 | Direct |
| 18 Dec, 2025 | Frederick W Buckman | Director | Acquired A | 1,176 | $0.00 | $0 | 7,879 | Direct |
| 18 Dec, 2025 | David John Hill | Director | Acquired A | 588 | $0.00 | $0 | 3,940 | Direct |