Nasdaq · CIK 0002019804
IMSR Terrestrial Energy Inc. /DE/
Insider trading from SEC Form 4. Last filing Jan 9, 2026.
Terrestrial Energy Inc. /DE/ (IMSR) has 14 SEC Form 4 filings on file from 11 insiders, the latest filed on Jan 9, 2026. No insider bought or sold on the open market in the last 90 days; rows filed in that time are grants, exercises, tax withholding and other transactions that carry no view on the price.
Last 90 days
Signals
Open-market buys and sells at Terrestrial Energy Inc. /DE/, scored.
Transactions
Every row filed, 25 in all.
| Date | Insider | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Dec 18, 2025 | William D Johnson director | AGrant or award Restricted Stock Unitsderivative | +1,029 | $0.00 | $0 | 6,894 | Jan 9, 2026 |
| Dec 18, 2025 | Frederick W Buckman director | AGrant or award Restricted Stock Unitsderivative | +6,703 | $0.00 | $0 | 6,703 | Dec 22, 2025 |
| Dec 18, 2025 | David John Hill director | AGrant or award Restricted Stock Unitsderivative | +3,352 | $0.00 | $0 | 3,352 | Dec 22, 2025 |
| Dec 18, 2025 | William D Johnson director | AGrant or award Restricted Stock Unitsderivative | +5,865 | $0.00 | $0 | 5,865 | Dec 22, 2025 |
| Dec 18, 2025 | Robert Wood Jones director | AGrant or award Restricted Stock Unitsderivative | +5,865 | $0.00 | $0 | 5,865 | Dec 22, 2025 |
| Dec 18, 2025 | Charles G Pardee director | AGrant or award Restricted Stock Unitsderivative | +5,027 | $0.00 | $0 | 5,027 | Dec 22, 2025 |
| Dec 18, 2025 | John Hugh MacDiarmid director | AGrant or award Restricted Stock Unitsderivative | +5,865 | $0.00 | $0 | 5,865 | Dec 22, 2025 |
| Dec 18, 2025 | Shawn Matthews director | AGrant or award Restricted Stock Unitsderivative | +4,190 | $0.00 | $0 | 4,190 | Dec 22, 2025 |
| Dec 18, 2025 | Frederick W Buckman director | AGrant or award Resricted Stock Unitsderivative | +1,176 | $0.00 | $0 | 7,879 | Dec 22, 2025 |
| Dec 18, 2025 | Charles G Pardee director | AGrant or award Resricted Stock Unitsderivative | +882 | $0.00 | $0 | 5,909 | Dec 22, 2025 |
| Dec 18, 2025 | Shawn Matthews director | AGrant or award Restricted Stock Unitsderivative | +735 | $0.00 | $0 | 4,925 | Dec 22, 2025 |
| Dec 18, 2025 | John Hugh MacDiarmid director | AGrant or award Resricted Stock Unitsderivative | +1,029 | $0.00 | $0 | 6,894 | Dec 22, 2025 |
| Dec 18, 2025 | Robert Wood Jones director | AGrant or award Resricted Stock Unitsderivative | +1,029 | $0.00 | $0 | 6,894 | Dec 22, 2025 |
| Dec 18, 2025 | William D Johnson director | AGrant or award Resricted Stock Unitsderivative | +1,720 | $0.00 | $0 | 7,585 | Dec 22, 2025 |
| Dec 18, 2025 | David John Hill director | AGrant or award Resricted Stock Unitsderivative | +588 | $0.00 | $0 | 3,940 | Dec 22, 2025 |
| Nov 6, 2025 | Shawn Matthews director | JOther Common Stock, par value $0.0001 per shareindirect: See Footnote | -2,920,000 | - | - | 2,755,000 | Nov 13, 2025 |
| Nov 6, 2025 | Shawn Matthews director | JOther Warrantsderivativeindirect: See Footnote | -3,500,000 | - | - | 775,000 | Nov 13, 2025 |
| Oct 28, 2025 | Andrew Scott Brenner other | JOther Common Stock, par value $0.0001 per share | +25,000 | - | - | 25,000 | Oct 30, 2025 |
| Oct 28, 2025 | Michael J Connor other | JOther Common Stock, par value $0.0001 per share | +25,000 | - | - | 25,000 | Oct 30, 2025 |
| Oct 28, 2025 | Shawn Matthews director | JOther Common Stock, par value $0.0001 per shareindirect: See Footnote | +5,675,000 | - | - | 5,675,000 | Oct 30, 2025 |
| Oct 28, 2025 | Simon Irish Chief Executive Officer | AGrant or award Restricted Stock Unitsderivative | +166,298 | $0.00 | $0 | 166,298 | Oct 30, 2025 |
| Oct 28, 2025 | Jacob Loveless other | JOther Common Stock, par value $0.0001 per share | +25,000 | - | - | 25,000 | Oct 30, 2025 |
| Oct 28, 2025 | Shawn Matthews director | JOther Common Stock, par value $0.0001 per share | +533,514 | - | - | 533,514 | Oct 30, 2025 |
| Oct 28, 2025 | Shawn Matthews director | JOther Warrantsderivativeindirect: See Footnote | -4,275,000 | $11.50 | $49M | 4,275,000 | Oct 30, 2025 |
| Oct 28, 2025 | Shawn Matthews director | JOther Warrantsderivativeindirect: See Footnote | -1,267,599 | $11.50 | $15M | 1,267,599 | Oct 30, 2025 |
Insiders
Everyone who has filed a Form 4 here.
- Frederick W Buckmandirector
- Andrew Scott Brennerother
- Michael J Connorother, director
- David John Hilldirector
- Simon IrishChief Executive Officer
- William D Johnsondirector
- Robert Wood Jonesdirector
- Jacob Lovelessdirector, other
- John Hugh MacDiarmiddirector
- Shawn Matthewsceo, chair, officer, director, owner
- Charles G Pardeedirector
Questions about IMSR
Answered from the filings on this page, as of the latest one.
Are insiders buying IMSR?
No. In the last 90 days no insider at Terrestrial Energy Inc. /DE/ bought or sold shares on the open market according to SEC Form 4 filings. The rows on file from that period are grants, exercises, tax withholding or other transactions, which carry no view on the price.
Who was the last insider to trade IMSR on the open market?
No open-market trade has been scored at Terrestrial Energy Inc. /DE/. The latest Form 4 on file was filed on Jan 9, 2026 and holds grants, exercises or other rows that are not market trades.
How many insiders file Form 4 at Terrestrial Energy Inc. /DE/?
11 people have filed a Form 4 at Terrestrial Energy Inc. /DE/, among them Frederick W Buckman (director), Andrew Scott Brenner (insider), Michael J Connor (director). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.