Terrestrial Energy Inc. (IMSR): CEO exercised options on 512K units

512K

Derivative units

Traded

Oct 21, 2026

Filed

Oct 26, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Oct 9, 2026InsiderDirector purchased ~$39K of IMSR shares in the open market
2. Oct 13, 2026InsiderCEO purchased ~$51K of IMSR shares in the open market
3. Oct 14, 2026InsiderDirector purchased ~$22K of IMSR shares in the open market

What came next

1. Nov 10, 2026Company filing · Form 8-K · ResultsReported its results

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Terrestrial Energy Inc.

For Terrestrial Energy Inc., OQRO holds 3 insider filings (SEC Form 4 or Form 144) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its IMSR page.

Other recent filings by Simon Irish, Chief Executive Officer

• SEC Form 4 at Terrestrial Energy Inc. (IMSR)Oct 14, 2026

The full history of Simon Irish, Chief Executive Officer is on the profile page.

How this filing works

• SEC Form 4
• Open-market purchase
• Rule 10b5-1 trading plans

Other disclosures at Terrestrial Energy Inc.

• SEC Form 4Oct 15, 2026
• SEC Form 4Oct 14, 2026
• SEC Form 4Oct 13, 2026

Everything OQRO holds on this company is on its IMSR page.