Terrestrial Energy Inc. (IMSR)
Terrestrial Energy Inc. (IMSR) Insider Trading
Directors, officers and holders of more than 10% of IMSR report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 39 most recent of 39 transactions on file: 3 with code P, 0 with code S and 36 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 28, 2026 | Irish Simon | Chief Executive Officer | M Exercise | 55,432 | Not measured | Not measured |
| Oct 28, 2026 | Irish Simon | Chief Executive Officer | M Exercise | 55,432 | Not measured | Not measured |
| Oct 21, 2026 | Irish Simon | Chief Executive Officer | M Exercise | 511,580 | Not measured | Not measured |
| Oct 21, 2026 | Irish Simon | Chief Executive Officer | M Exercise | 511,580 | Not measured | Not measured |
| Oct 19, 2026 | Williams David Woodward | Chief Commercial Officer | A Award | 152,672 | Not measured | Not measured |
| Oct 14, 2026 | Pardee Charles G | Director | P Purchase | 7,500 | $2.95 | $22,125 |
| Oct 13, 2026 | Irish Simon | Chief Executive Officer | P Purchase | 16,900 | $3.01 | $50,818 |
| Oct 9, 2026 | BUCKMAN FREDERICK W | Director | P Purchase | 12,000 | $3.28 | $39,336 |
| Jul 23, 2026 | McCarthy Kathryn Ann | Director | A Award | 2,049 | Not measured | Not measured |
| Apr 12, 2026 | Thrasher Brian Patrick | Chief Financial Officer | A Award | 58,236 | Not measured | Not measured |
| Apr 12, 2026 | Millsap Steven M. | General Counsel | A Award | 49,917 | Not measured | Not measured |
| Apr 12, 2026 | LeBlanc David Michael | Chief Technology Officer | A Award | 32,787 | Not measured | Not measured |
| Apr 12, 2026 | Smith William F. | Chief Operating Officer | A Award | 32,787 | Not measured | Not measured |
| Apr 12, 2026 | Thrasher Brian Patrick | Chief Financial Officer | A Award | 49,917 | Not measured | Not measured |
| Dec 18, 2025 | Matthews Shawn | Director | A Award | 735 | Not measured | Not measured |
| Dec 18, 2025 | Jones Robert Wood | Director | A Award | 5,865 | Not measured | Not measured |
| Dec 18, 2025 | JOHNSON WILLIAM D | Director | A Award | 1,029 | Not measured | Not measured |
| Dec 18, 2025 | JOHNSON WILLIAM D | Director | A Award | 5,865 | Not measured | Not measured |
| Dec 18, 2025 | JOHNSON WILLIAM D | Director | A Award | 1,720 | Not measured | Not measured |
| Dec 18, 2025 | BUCKMAN FREDERICK W | Director | A Award | 6,703 | Not measured | Not measured |
| Dec 18, 2025 | BUCKMAN FREDERICK W | Director | A Award | 1,176 | Not measured | Not measured |
| Dec 18, 2025 | Jones Robert Wood | Director | A Award | 1,029 | Not measured | Not measured |
| Dec 18, 2025 | Hill David John | Director | A Award | 3,352 | Not measured | Not measured |
| Dec 18, 2025 | Hill David John | Director | A Award | 588 | Not measured | Not measured |
| Dec 18, 2025 | Pardee Charles G | Director | A Award | 5,027 | Not measured | Not measured |
| Dec 18, 2025 | Pardee Charles G | Director | A Award | 882 | Not measured | Not measured |
| Dec 18, 2025 | MacDiarmid John Hugh | Director | A Award | 5,865 | Not measured | Not measured |
| Dec 18, 2025 | MacDiarmid John Hugh | Director | A Award | 1,029 | Not measured | Not measured |
| Dec 18, 2025 | Matthews Shawn | Director | A Award | 4,190 | Not measured | Not measured |
| Nov 6, 2025 | Matthews Shawn | Director | J Other | 3,500,000 | Not measured | Not measured |
| Nov 6, 2025 | Matthews Shawn | Director | J Other | 2,920,000 | Not measured | Not measured |
| Oct 28, 2025 | Matthews Shawn | Director | J Other | 4,275,000 | $11.50 | $49,162,500 |
| Oct 28, 2025 | Connor Michael J | Not stated | J Other | 25,000 | Not measured | Not measured |
| Oct 28, 2025 | Matthews Shawn | Director | J Other | 533,514 | Not measured | Not measured |
| Oct 28, 2025 | Matthews Shawn | Director | J Other | 5,675,000 | Not measured | Not measured |
| Oct 28, 2025 | Loveless Jacob | Not stated | J Other | 25,000 | Not measured | Not measured |
| Oct 28, 2025 | Irish Simon | Chief Executive Officer | A Award | 166,298 | Not measured | Not measured |
| Oct 28, 2025 | Brenner Andrew Scott | Not stated | J Other | 25,000 | Not measured | Not measured |
| Oct 28, 2025 | Matthews Shawn | Director | J Other | 1,267,599 | $11.50 | $14,577,389 |
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.