Terrestrial Energy Inc. /DE/ (IMSR) Insider Ownership

Historic Insider Ownership Trends

As of May 30, 2026, the three largest insider holders of IMSR are Shawn Matthews (Director, 2.75Mn shares), Shawn Matthews (Director, 533.51K shares), Jacob Loveless (Other, 25.00K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Shawn Matthews - 0 2,755,000 13 Nov, 2025
Jacob Loveless - 25,000 0 30 Oct, 2025
Michael J Connor - 25,000 0 30 Oct, 2025
Andrew Scott Brenner - 25,000 0 30 Oct, 2025

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
12 Apr, 2026 William F. Smith Stock Option (Right to Buy) A 32,787 $0.00 32,787 D A
12 Apr, 2026 Steven M. Millsap Restricted Stock Units A 49,917 $0.00 49,917 D A
12 Apr, 2026 Brian Patrick Thrasher Restricted Stock Units A 49,917 $0.00 49,917 D A
12 Apr, 2026 Steven M. Millsap Restricted Stock Units A 49,917 $0.00 49,917 D A
12 Apr, 2026 Brian Patrick Thrasher Restricted Stock Units A 49,917 $0.00 49,917 D A
12 Apr, 2026 William F. Smith Stock Option (Right to Buy) A 32,787 $0.00 32,787 D A
12 Apr, 2026 Brian Patrick Thrasher Stock Option (Right to Buy) A 58,236 $0.00 58,236 D A
12 Apr, 2026 Brian Patrick Thrasher Stock Option (Right to Buy) A 58,236 $0.00 58,236 D A
12 Apr, 2026 David Michael Leblanc Stock Option (Right to Buy) A 32,787 $0.00 32,787 D A
18 Dec, 2025 William D Johnson Restricted Stock Units A 1,029 $0.00 6,894 D A
18 Dec, 2025 David John Hill Restricted Stock Units A 3,352 $0.00 3,352 D A
18 Dec, 2025 Charles G Pardee Restricted Stock Units A 5,027 $0.00 5,027 D A
18 Dec, 2025 Robert Wood Jones Restricted Stock Units A 5,865 $0.00 5,865 D A
18 Dec, 2025 Shawn Matthews Restricted Stock Units A 4,190 $0.00 4,190 D A
18 Dec, 2025 William D Johnson Restricted Stock Units A 5,865 $0.00 5,865 D A
18 Dec, 2025 Frederick W Buckman Restricted Stock Units A 6,703 $0.00 6,703 D A
18 Dec, 2025 John Hugh Macdiarmid Restricted Stock Units A 5,865 $0.00 5,865 D A
18 Dec, 2025 William D Johnson Resricted Stock Units A 1,720 $0.00 7,585 D A
18 Dec, 2025 Frederick W Buckman Resricted Stock Units A 1,176 $0.00 7,879 D A
18 Dec, 2025 John Hugh Macdiarmid Resricted Stock Units A 1,029 $0.00 6,894 D A