Terrestrial Energy IMSR Insider Ownership

Updated Nov 4, 2026

Over the trailing 12 months, IMSR insiders bought $112,279 worth of shares (36.4K shares) in open-market trades, with no open-market sales.

• Counted by insider, open-market buying of IMSR stock in the past 12 months came from 3 insiders, with no insider selling.
• Among IMSR insiders, Simon Irish (Chief Executive Officer) bought the most stock on the open market in the past 12 months: $50,818 (16.9K shares), most recently on October 13, 2026.
• Terrestrial Energy's latest insider trade on the open market was a purchase of 7.5K shares for $22,125 by Charles G. Pardee (Director) on October 14, 2026.
• In transactions other than open-market trades, Terrestrial Energy insiders acquired 567.01K shares through option exercises and conversions over the past 12 months.
• According to Business Quant data, insiders at Terrestrial Energy reported 6.28Mn shares in total in their latest Form 4 filings, up 9.15% from 5.75Mn shares at the end of Q3 2025.
• Terrestrial Energy insiders hold 3.52Mn shares directly (56.10% of their total) and 2.75Mn shares (43.90%) indirectly, through entities such as trusts and partnerships.
• Per Business Quant, 7 insiders of IMSR hold shares, counting officers, directors and 10% owners who have filed a Form 4 in the past two years.
• IMSR's largest insider holders by reported holdings are Shawn Matthews (Director, 3.29Mn shares), Simon Irish (Chief Executive Officer, 2.88Mn shares) and Jacob Loveless (25K shares).
• The holding of Shawn Matthews makes up 52.40% of all shares held by Terrestrial Energy insiders.
• Institutions accounted for 20.34% of IMSR's outstanding shares in Q2 2026, insiders about 5.92% per their latest Form 4 filings, and other investors, including the public, about 73.74%.
• In the past year, 15 insiders of Terrestrial Energy submitted 21 Form 4 filings reporting trades, awards or other transactions.
• This summary of Terrestrial Energy insider activity covers Form 4 filings through October 30, 2026.