Company profile
Terrestrial Energy Inc. /DE/ insider acquisitions
Company CIK 0002019804 · Reported insider acquisitions and filing context.
IMSR · NasdaqIMSRW · Nasdaq
These are company listings. A transaction is linked to a particular security only when the filing provides enough information.
Company activity summary
By transaction date, as of October 23, 2026.
| Type / code | Reported security | Transactions | Known purchase value | Missing amounts |
|---|---|---|---|---|
| Stock awardCode A | Stock Option (Right to Buy)Derivative · Currency not specified | 1 | Not applicable | 0 |
| PurchaseCode P | Common StockNon-derivative · Currency not specified | 3 | 112,279.3 | 0 |
Known purchase value sums available amounts for non-derivative purchases only. Missing amounts are excluded. “Currency not specified” does not establish that the amounts share a currency. These summaries use all matching loaded records, while the timeline below covers only the current page.
Transaction timeline
Who reported an acquisition, and when the transaction occurred.
PurchaseStock awardGift receivedExercise / conversionConversionOther acquisition
24 dated transactions · 8 of 13 reporting owners shown. Select one owner to focus the chart.
View timeline as a table
| Transaction date | Company / security | Reporting owners | Acquisition type |
|---|---|---|---|
| Oct 19, 2026 | Terrestrial Energy Inc. /DE/Stock Option (Right to Buy) | Williams David Woodward | Stock award |
| Oct 14, 2026 | Terrestrial Energy Inc. /DE/Common Stock | Pardee Charles G | Purchase |
| Oct 13, 2026 | Terrestrial Energy Inc. /DE/Common Stock | Irish Simon | Purchase |
| Oct 9, 2026 | Terrestrial Energy Inc. /DE/Common Stock | BUCKMAN FREDERICK W | Purchase |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Restricted Stock Units | Matthews Shawn | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Restricted Stock Units | Matthews Shawn | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Resricted Stock Units | BUCKMAN FREDERICK W | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Restricted Stock Units | BUCKMAN FREDERICK W | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Resricted Stock Units | JOHNSON WILLIAM D | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Restricted Stock Units | JOHNSON WILLIAM D | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Resricted Stock Units | Jones Robert Wood | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Restricted Stock Units | Jones Robert Wood | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Resricted Stock Units | Hill David John | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Restricted Stock Units | Hill David John | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Resricted Stock Units | Pardee Charles G | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Restricted Stock Units | Pardee Charles G | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Resricted Stock Units | MacDiarmid John Hugh | Stock award |
| Dec 18, 2025 | Terrestrial Energy Inc. /DE/Restricted Stock Units | MacDiarmid John Hugh | Stock award |
| Oct 28, 2025 | Terrestrial Energy Inc. /DE/Common Stock, par value $0.0001 per share | Connor Michael J | Other acquisition |
| Oct 28, 2025 | Terrestrial Energy Inc. /DE/Common Stock, par value $0.0001 per share | Brenner Andrew Scott | Other acquisition |
| Oct 28, 2025 | Terrestrial Energy Inc. /DE/Common Stock, par value $0.0001 per share | Loveless Jacob | Other acquisition |
| Oct 28, 2025 | Terrestrial Energy Inc. /DE/Common Stock, par value $0.0001 per share | Matthews Shawn · HCM Investor Holdings II, LLC | Other acquisition |
| Oct 28, 2025 | Terrestrial Energy Inc. /DE/Common Stock, par value $0.0001 per share | Matthews Shawn · HCM Investor Holdings II, LLC | Other acquisition |
| Oct 28, 2025 | Terrestrial Energy Inc. /DE/Restricted Stock Units | Irish Simon | Stock award |
Only transactions on this page are shown. Date windows end on the latest transaction date in this sample. Joint filings may appear on more than one row. Sales are not included. Share-price charts use a separate data source.
Share price & reported acquisitions
Daily closing prices from a separate source. The date window above also filters prices; reporting-owner and transaction-type selections filter the markers.
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Currency not specified. A marker uses that day's closing price, not the reported transaction price. No price is substituted for a missing trading day.
Reported acquisitions
Filing-date filters apply to the list and timeline. The summary above uses transaction dates.
| Filed / transacted | Reporting owners | Type / security | Quantity | Price / reference value | Details |
|---|---|---|---|---|---|
| Trade: | Williams David WoodwardChief Commercial Officer | Stock awardStock Option (Right to Buy)Derivative security · Code A | 152,672 | 0Value: 0Currency not specified | View ↗ |
| Trade: | Pardee Charles GDirector | PurchaseCommon StockNon-derivative security · Code P | 7,500 | 2.95Value: 22,125Currency not specified | View ↗ |
| Trade: | Irish SimonChief Executive Officer · Director | PurchaseCommon StockNon-derivative security · Code P | 16,900 | 3.007Value: 50,818.3Currency not specified | View ↗ |
| Trade: | BUCKMAN FREDERICK WDirector | PurchaseCommon StockNon-derivative security · Code P | 12,000 | 3.278Value: 39,336Currency not specified | View ↗ |
| Trade: | Matthews ShawnDirector | Stock awardRestricted Stock UnitsDerivative security · Code A | 735 | 0Value: 0Currency not specified | View ↗ |
| Trade: | Matthews ShawnDirector | Stock awardRestricted Stock UnitsDerivative security · Code A | 4,190 | 0Value: 0Currency not specified | View ↗ |
| Trade: | BUCKMAN FREDERICK WDirector | Stock awardResricted Stock UnitsDerivative security · Code A | 1,176 | 0Value: 0Currency not specified | View ↗ |
| Trade: | BUCKMAN FREDERICK WDirector | Stock awardRestricted Stock UnitsDerivative security · Code A | 6,703 | 0Value: 0Currency not specified | View ↗ |
| Trade: | JOHNSON WILLIAM DDirector | Stock awardResricted Stock UnitsDerivative security · Code A | 1,720 | 0Value: 0Currency not specified | View ↗ |
| Trade: | JOHNSON WILLIAM DDirector | Stock awardRestricted Stock UnitsDerivative security · Code A | 5,865 | 0Value: 0Currency not specified | View ↗ |
| Trade: | Jones Robert WoodDirector | Stock awardResricted Stock UnitsDerivative security · Code A | 1,029 | 0Value: 0Currency not specified | View ↗ |
| Trade: | Jones Robert WoodDirector | Stock awardRestricted Stock UnitsDerivative security · Code A | 5,865 | 0Value: 0Currency not specified | View ↗ |
| Trade: | Hill David JohnDirector | Stock awardResricted Stock UnitsDerivative security · Code A | 588 | 0Value: 0Currency not specified | View ↗ |
| Trade: | Hill David JohnDirector | Stock awardRestricted Stock UnitsDerivative security · Code A | 3,352 | 0Value: 0Currency not specified | View ↗ |
| Trade: | Pardee Charles GDirector | Stock awardResricted Stock UnitsDerivative security · Code A | 882 | 0Value: 0Currency not specified | View ↗ |
| Trade: | Pardee Charles GDirector | Stock awardRestricted Stock UnitsDerivative security · Code A | 5,027 | 0Value: 0Currency not specified | View ↗ |
| Trade: | MacDiarmid John HughDirector | Stock awardResricted Stock UnitsDerivative security · Code A | 1,029 | 0Value: 0Currency not specified | View ↗ |
| Trade: | MacDiarmid John HughDirector | Stock awardRestricted Stock UnitsDerivative security · Code A | 5,865 | 0Value: 0Currency not specified | View ↗ |
| Trade: | Connor Michael JFormer Director | Other acquisitionCommon Stock, par value $0.0001 per shareNon-derivative security · Code J | 25,000 | Not reported *Value: Not reportedCurrency not specified | View ↗ |
| Trade: | Brenner Andrew ScottFormer Director | Other acquisitionCommon Stock, par value $0.0001 per shareNon-derivative security · Code J | 25,000 | Not reported *Value: Not reportedCurrency not specified | View ↗ |
| Trade: | Loveless JacobFormer Director | Other acquisitionCommon Stock, par value $0.0001 per shareNon-derivative security · Code J | 25,000 | Not reported *Value: Not reportedCurrency not specified | View ↗ |
| Trade: | Matthews ShawnDirector HCM Investor Holdings II, LLCFormer 10% owner Joint filing · amounts unallocated | Other acquisitionCommon Stock, par value $0.0001 per shareNon-derivative security · Code J | 533,514 | Not reported *Value: Not reportedCurrency not specified | View ↗ |
| Trade: | Matthews ShawnDirector HCM Investor Holdings II, LLCFormer 10% owner Joint filing · amounts unallocated | Other acquisitionCommon Stock, par value $0.0001 per shareNon-derivative security · Code J | 5,675,000 | Not reported *Value: Not reportedCurrency not specified | View ↗ |
| Trade: | Irish SimonChief Executive Officer · Director | Stock awardRestricted Stock UnitsDerivative security · Code A | 166,298 | 0Value: 0Currency not specified | View ↗ |
24 transactions on this page. Filing date, newest first.
Reporting owners are associated with a filing. Jointly reported amounts are not allocated to individual owners. Historical coverage is still being built. Read the methodology →