Terrestrial Energy Inc. (IMSR) — insider trading
Industrials · NASDAQ
Terrestrial Energy Inc. (IMSR) has 21 reported SEC Form 4 insider transactions in our data, including 3 open-market purchases among the most recent 21 (latest 2026-10-14).
Recent Form 4 transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-10-14 | Pardee Charles G | Director | Open-market purchase | 7,500 | $2.95 | $22.1K | Form 4 |
| 2026-10-13 | Irish Simon | Director, Officer (Chief Executive Officer) | Open-market purchase | 16,900 | $3.01 | $50.8K | Form 4 |
| 2026-10-09 | BUCKMAN FREDERICK W | Director | Open-market purchase | 12,000 | $3.28 | $39.3K | Form 4 |
| 2026-07-29 | Cowan Pamela Beth | Officer (EVP, Engineering) | Grant / award / vesting (derivative) | 299,401 | — | $0 | Form 4 |
| 2026-07-23 | McCarthy Kathryn Ann | Director | Grant / award / vesting (derivative) | 2,049 | — | $0 | Form 4 |
| 2026-04-12 | LeBlanc David Michael | Director, Officer (Chief Technology Officer) | Grant / award / vesting (derivative) | 32,787 | — | $0 | Form 4 |
| 2026-04-12 | Smith William F. | Officer (Chief Operating Officer) | Grant / award / vesting (derivative) | 32,787 | — | $0 | Form 4 |
| 2026-04-12 | Thrasher Brian Patrick | Officer (Chief Financial Officer) | Grant / award / vesting (derivative) | 58,236 | — | $0 | Form 4 |
| 2026-04-12 | Thrasher Brian Patrick | Officer (Chief Financial Officer) | Grant / award / vesting (derivative) | 49,917 | — | $0 | Form 4 |
| 2026-04-12 | Millsap Steven M. | Officer (General Counsel) | Grant / award / vesting (derivative) | 49,917 | — | $0 | Form 4 |
| 2025-12-18 | JOHNSON WILLIAM D | Director | Grant / award / vesting (derivative) | 1,029 | — | $0 | Form 4/A |
| 2025-12-18 | Pardee Charles G | Director | Grant / award / vesting (derivative) | 882 | — | $0 | Form 4 |
| 2025-12-18 | Pardee Charles G | Director | Grant / award / vesting (derivative) | 5,027 | — | $0 | Form 4 |
| 2025-12-18 | Hill David John | Director | Grant / award / vesting (derivative) | 588 | — | $0 | Form 4 |
| 2025-12-18 | Hill David John | Director | Grant / award / vesting (derivative) | 3,352 | — | $0 | Form 4 |
| 2025-12-18 | Jones Robert Wood | Director | Grant / award / vesting (derivative) | 1,029 | — | $0 | Form 4 |
| 2025-12-18 | Jones Robert Wood | Director | Grant / award / vesting (derivative) | 5,865 | — | $0 | Form 4 |
| 2025-12-18 | JOHNSON WILLIAM D | Director | Grant / award / vesting (derivative) | 1,720 | — | $0 | Form 4 |
| 2025-12-18 | JOHNSON WILLIAM D | Director | Grant / award / vesting (derivative) | 5,865 | — | $0 | Form 4 |
| 2025-12-18 | BUCKMAN FREDERICK W | Director | Grant / award / vesting (derivative) | 1,176 | — | $0 | Form 4 |
| 2025-12-18 | BUCKMAN FREDERICK W | Director | Grant / award / vesting (derivative) | 6,703 | — | $0 | Form 4 |
Ask the chat about IMSR's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: Terrestrial Energy Inc. (IMSR).
Last updated 2026-10-14 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.