Terrestrial Energy Inc. /DE/ - Common stock, par value $0.0001 per share (the "Shares") (IMSR) Institutional Ownership

13F Institutional Holders and Ownership History for Q4 2025

Type / Class
Equity / Common stock, par value $0.0001 per share (the "Shares")
Symbol
IMSR on Nasdaq
Shares outstanding
104,718,000
Price per share
$10.41
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
21,413,886
Total reported value
$130,648,651
% of total 13F portfolios
0%
Share change
+20,885,386
Value change
+$127,419,516
Number of holders
81
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of Terrestrial Energy Inc. /DE/ - Common stock, par value $0.0001 per share (the "Shares") (IMSR) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
Sella Roberto Marco 14% $93,974,555 15,378,689 Roberto Marco Sella 29 Oct 2025
Irish Simon 13% 13,586,445 Simon Irish 28 Oct 2025
LeBlanc David Michael 9.7% 11,400,410 David LeBlanc 28 Oct 2025
CITADEL ADVISORS LLC 2.2% $24,811,883 2,303,796 Kenneth Griffin 31 Dec 2025
Linden Capital L.P. 0.9% 209,426 Linden Capital L.P. 30 Sep 2025
Magnetar Financial LLC 0.62% 142,304 MAGNETAR FINANCIAL LLC 30 Sep 2025

As of 31 Dec 2025, 81 institutional investors reported holding 21,413,886 shares of Terrestrial Energy Inc. /DE/ - Common stock, par value $0.0001 per share (the "Shares") (IMSR). This represents 20% of the company’s total 104,718,000 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Terrestrial Energy Inc. /DE/ - Common stock, par value $0.0001 per share (the "Shares") (IMSR) together control 18% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
CITADEL ADVISORS LLC 1.9% 2,029,208 0.01% $12,398,461
VANGUARD GROUP INC 1.8% 1,849,446 0% $11,300,115
Balyasny Asset Management L.P. 1.3% 1,400,953 0.02% $8,559,823
JPMORGAN CHASE & CO 1.1% 1,170,087 0% $7,149,232
BlackRock, Inc. 1% 1,092,501 0% $6,675,182
D. E. Shaw & Co., Inc. 1% 1,079,546 0.01% $6,596,026
Senator Investment Group LP 0.86% 900,000 0.22% $5,499,000
GEODE CAPITAL MANAGEMENT, LLC 0.76% 796,327 0% $4,868,025
Verition Fund Management LLC 0.72% 753,803 0.02% $4,605,736
MMCAP International Inc. SPC 0.72% 750,000 0.46% $4,582,500
Hudson Bay Capital Management LP 0.7% 736,038 0.03% $4,497,192
Alyeska Investment Group, L.P. 0.69% 722,000 0.01% $4,383,914
WINTON GROUP Ltd 0.62% 646,190 0.14% $3,948,221
LMR Partners LLP 0.56% 588,214 0.03% $3,593,988
CANTOR FITZGERALD, L. P. 0.53% 550,000 0.1% $3,360,500
UBS Group AG 0.49% 512,644 0% $3,132,255
HBK INVESTMENTS L P 0.48% 500,000 0.03% $3,055,000
Galaxy Group Investments LLC 0.48% 500,000 0% 0.37% $3,055,000
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.39% 410,877 0% $2,510,458
SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.33% 348,532 0% $2,129,531
STATE STREET CORP 0.31% 326,700 0% $1,996,137
JANE STREET GROUP, LLC 0.29% 301,213 0% $1,840,411
GOLDMAN SACHS GROUP INC 0.27% 281,764 0% $1,721,578
Shay Capital LLC 0.26% 277,363 0.27% $1,694,688
HIGHBRIDGE CAPITAL MANAGEMENT LLC 0.23% 244,000 0.07% $1,490,840

Institutional Holders of Terrestrial Energy Inc. /DE/ - Common stock, par value $0.0001 per share (the "Shares") (IMSR) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 21,413,886 $130,648,651 +$127,419,516 $6.11 81