Terrestrial Energy Inc.
IMSR- Exchange
- Nasdaq
- Industry
- Fabricated Plate Work (Boiler Shops)
- SEC CIK
- 0002019804
No open-market purchases or sales by Terrestrial Energy Inc. insiders were filed in the last 90 days; 110 institutions reported holding it in 13F filings for Q2 2026, worth $151.4M in total; no superinvestor holds it.
Other share classesIMSRW
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Terrestrial Energy Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 0 filings
- Insiders trading
- 0
- Net value
- $0
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Terrestrial Energy Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Cowan Pamela Beth | EVP, Engineering | – | Jul 31, 2026 | 1 |
| McCarthy Kathryn Ann | Director | – | Jul 27, 2026 | 1 |
| Millsap Steven M. | General Counsel | – | Apr 14, 2026 | 1 |
| Thrasher Brian Patrick | Chief Financial Officer | – | Apr 14, 2026 | 1 |
| Smith William F. | Chief Operating Officer | – | Apr 14, 2026 | 1 |
| LeBlanc David Michael | Chief Technology Officer | – | Apr 14, 2026 | 1 |
| Johnson William D | Director | – | Jan 9, 2026 | 1 |
| Buckman Frederick W | Director | – | Dec 22, 2025 | 1 |
| Jones Robert Wood | Director | – | Dec 22, 2025 | 1 |
| Pardee Charles G | Director | – | Dec 22, 2025 | 1 |
| Matthews Shawn | Director | 2,755,000Indirect | Dec 22, 2025 | 3 |
| Hill David John | Director | – | Dec 22, 2025 | 1 |
| MacDiarmid John Hugh | Director | – | Dec 22, 2025 | 1 |
| HCM Investor Holdings II, LLC | Other: Former 10% Holder | 2,755,000Indirect | Nov 13, 2025 | 2 |
| Loveless Jacob | Other: Former Director | 25,000 | Oct 30, 2025 | 1 |
| Connor Michael J | Other: Former Director | 25,000 | Oct 30, 2025 | 1 |
| Brenner Andrew Scott | Other: Former Director | 25,000 | Oct 30, 2025 | 1 |
| Irish Simon | Chief Executive Officer | – | Oct 30, 2025 | 1 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
No insider trades match these filters.