$IMSR

$3.29 +$0.35 (11.9%) Close

$IMSR Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 105.9M shares outstanding

Who owns IMSR?

By type of holder

Institutions 19.8% Insiders 6.3% Everyone else 73.9%

Concentration Top 10 holders own 34.9%

Simon Irish 12.8% · David LeBlanc 10.8%

Institutional ownership

19.8%

+2.2 pts vs last qtr

Institutional holders

109

+21 vs last qtr

Net shares bought

+2.3M

by institutions in Q2 2026

New / sold out

38 / 17

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Vanguard Capital Management LLC +2.1M
UBS Group AG +1.3M

Biggest sellers in Q2 2026

Citadel Advisors LLC −1.3M
D. E. Shaw & Co., Inc. −546.8K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Terrestrial Energy Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2024–FY2025

+18.6%

+18.59% a year

Each share's claim on the business

−15.7%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $3.77M

over 2 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years29% Under 1 year71%

Quarterly turnover

32.9%

of institutional shares changed hands

Top 10 managers, median time held

1 year

Super Investors

Investment managers reporting IMSR on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
VC Vanguard Capital Management LLC	3.4M	3.22%	+2.1M (+161.9%)	Q4 '25	0.0%
Shares held by quarter Peak holding3.4M (Q2'26) Change over 8 quarters+3.4M Share of the company3.220% Vanguard Capital Management LLC's full portfolio →
ET Exchange Traded Concepts, LLC	2.2M	2.04%	+68.9K (+3.3%)	Q1 '26	0.1%
Shares held by quarter Peak holding2.2M (Q2'26) Change over 8 quarters+2.2M Share of the company2.040% Exchange Traded Concepts, LLC's full portfolio →

Vanguard Capital Management LLC

3.4M

% of company

3.22%

Change vs last qtr

+2.1M (+161.9%)

Held since

Q4 '25

Exchange Traded Concepts, LLC

2.2M

% of company

2.04%

Change vs last qtr

+68.9K (+3.3%)

Held since

Q1 '26

28 more super investors behind a free account

See every manager holding Terrestrial Energy Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting IMSR on Form N-PORT; together they hold 8.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$19.1M	2.7M	2.55%	0.00%	June 30, 2026
GX Global X Uranium ETF Global X Funds	$18.9M	3.8M	3.63%	0.35%	July 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$19.1M

% of company

2.55%

% of the fund

0.00%

As of

June 30, 2026

Global X Uranium ETF

Global X Funds

Position value

$18.9M

% of company

3.63%

% of the fund

0.35%

As of

July 31, 2026

23 more funds behind a free account

See every fund holding Terrestrial Energy Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
SI Simon Irish 5%+ holder 13D · 12.8%	13.6M	12.83%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company12.830% Disclosed stake13D · 12.8% View the 13D/G filing →
DL David LeBlanc 5%+ holder 13D · 9.7%	11.4M	10.76%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company10.760% Disclosed stake13D · 9.7% View the 13D/G filing →

Simon Irish

5%+ holder13D · 12.8%

13.6M

% of company

12.83%

Change vs last qtr

—

Held since

—

David LeBlanc

5%+ holder13D · 9.7%

11.4M

% of company

10.76%

Change vs last qtr

—

Held since

—

3 more holders behind a free account

See every insider and 5%+ holder of Terrestrial Energy Inc.

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