LYTIR

Company · IMSR

Terrestrial Energy Inc.

Name as listed on its exchange; filed with the SEC as Terrestrial Energy Inc. /DE/.

Nasdaq's symbol directory lists IMSR on Nasdaq as “Terrestrial Energy Inc. - Common Stock”.

In the 12 months to Nov 8, 2026: insiders bought on 3 occasions ($112K); 1 company report (Form 8-K, since May 26, 2026).

All insider filings at the SEC · Appeared in No. 28, No. 27, No. 26, No. 25, No. 24, No. 23, No. 22

Insider trades · SEC Form 4

Those inside the hall

Open-market purchases and sales only. Legs one person filed for one day are combined.

Who traded

  1. Irish Simon, Chief Executive Officer bought on 1 day latest Oct 13, 2026 bought $51K
  2. BUCKMAN FREDERICK W bought on 1 day latest Oct 9, 2026 bought $39K
  3. Charles G. Pardee bought on 1 day latest Oct 14, 2026 bought $22K
Every trade (3)
  1. BUYCharles G. Pardee bought Oct 14, 2026 7,500 shares filing $22K
  2. BUYIrish Simon, Chief Executive Officer bought Oct 13, 2026 16,900 shares filing $51K
  3. BUYBUCKMAN FREDERICK W bought Oct 9, 2026 12,000 shares filing $39K

Company reports · SEC Form 8-K

In its own words

Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.

  1. Other events filing Oct 27, 2026

Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.