Company · Ownership research

Terrestrial Energy Inc. /DE/ IMSR

CIK 0002019804 · CUSIP 881454102

Insider tradingInitial holdingsInstitutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 881454102 (IMSR), not CUSIP 881454902 (IMSR), CUSIP 881454952 (IMSR), CUSIP G43658106 (IMSR), and does not merge CUSIPs.

This page lists the top 20 of 59 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	UBS Group AG CIK 1610520 · View history	$7.37M 1,894,829 shares	0.00%	+122.66K(+6.90%)Added	SEC filing ↗ Nov 10, 2026	▾
02	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$2.65M 681,605 shares	0.00%	-12.33K(-1.80%)Reduced	SEC filing ↗ Nov 6, 2026	▾
03	EXCHANGE TRADED CONCEPTS, LLC CIK 1457320 · View history	$2.40M 616,430 shares	0.01%	-1.54M(-71.50%)Reduced	SEC filing ↗ Oct 28, 2026	▾
04	WINTON GROUP Ltd CIK 1612063 · View history	$1.91M 490,000 shares	0.07%	-14.00K(-2.80%)Reduced	SEC filing ↗ Nov 12, 2026	▾
05	STATE STREET CORP CIK 93751 · View history	$1.13M 289,700 shares	0.00%	-57.00K(-16.40%)Reduced	SEC filing ↗ Nov 12, 2026	▾
06	Creek Drive Management Group LLC CIK 2111824 · View history	$1.01M 260,000 shares	0.50%	+85.00K(+48.60%)Added	SEC filing ↗ Nov 10, 2026	▾
07	Squarepoint Ops LLC CIK 1642575 · View history	$931.40K 239,434 shares	0.00%	+153.93K(+180.00%)Added	SEC filing ↗ Nov 9, 2026	▾
08	FNY Investment Advisers, LLC CIK 1742998 · View history	$697.00K 179,235 shares	0.17%	+27.59K(+18.20%)Added	SEC filing ↗ Oct 16, 2026	▾
09	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$635.28K 163,310 shares	0.00%	-20.49K(-11.10%)Reduced	SEC filing ↗ Nov 12, 2026	▾
10	LANDSCAPE CAPITAL MANAGEMENT, L.L.C. CIK 1536186 · View history	$594.07K 152,717 shares	0.04%	+152.72KNew	SEC filing ↗ Nov 10, 2026	▾
11	CITIGROUP INC CIK 831001 · View history	$568.46K 146,133 shares	0.00%	+144.62K(+9,577.70%)Added	SEC filing ↗ Nov 4, 2026	▾
12	Yorkville Advisors Global, LP CIK 1838613 · View history	$474.58K 122,000 shares	0.56%	0(0.00%)Unchanged	SEC filing ↗ Nov 12, 2026	▾
13	COMMONWEALTH EQUITY SERVICES, LLC CIK 312272 · View history	$469.88K 120,793 shares	0.00%	+10.00K(+9.00%)Added	SEC filing ↗ Nov 2, 2026	▾
14	Periscope Capital Inc. CIK 1695320 · View history	$440.42K 122,000 shares	0.08%	0(0.00%)Unchanged	SEC filing ↗ Nov 6, 2026	▾
15	Mount Lucas Management LP CIK 1185072 · View history	$361.77K 93,000 shares	0.15%	0(0.00%)Unchanged	SEC filing ↗ Nov 9, 2026	▾
16	TIEMANN INVESTMENT ADVISORS, LLC CIK 1575151 · View history	$295.62K 75,995 shares	0.09%	0(0.00%)Unchanged	SEC filing ↗ Nov 12, 2026	▾
17	IMC-Chicago, LLC CIK 1452861 · View history	$284.66K 73,178 shares	0.00%	-1.81K(-2.40%)Reduced	SEC filing ↗ Nov 5, 2026	▾
18	Quantbot Technologies LP CIK 1512991 · View history	$209.06K 53,742 shares	0.01%	+53.74KNew	SEC filing ↗ Nov 12, 2026	▾
19	LPL Financial LLC CIK 1403438 · View history	$168.96K 43,434 shares	0.00%	+1.05K(+2.50%)Added	SEC filing ↗ Nov 6, 2026	▾
20	SIMON QUICK ADVISORS, LLC CIK 1692038 · View history	$155.60K 40,000 shares	0.01%	0(0.00%)Unchanged	SEC filing ↗ Oct 26, 2026	▾

Showing 20 / 59 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

6,192,127

Not deduplicated across managers

Disclosed value

$24.10M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Terrestrial Energy Inc. /DE/ · Q3 2026

Explore all 59 reporting institutions.

This page includes 20 of 59 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.