Company · Ownership research

Terrestrial Energy Inc. /DE/ IMSR

CIK 0002019804 · CUSIP 881454102

Insider trading Initial holdings Institutional 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 111 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	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · View history	$24.17M 3,414,196 shares	0.00%	+2.11M(+161.90%)Added	SEC filing ↗ Aug 13, 2026	▾
02	EXCHANGE TRADED CONCEPTS, LLC CIK 1457320 · Amended · View history	$15.29M 2,160,074 shares	0.08%	+68.91K(+3.30%)Added	SEC filing ↗ Jul 22, 2026	▾
03	UBS Group AG CIK 1610520 · View history	$12.55M 1,772,173 shares	0.00%	+1.28M(+259.00%)Added	SEC filing ↗ Aug 13, 2026	▾
04	HRT FINANCIAL LP CIK 1475597 · View history	$7.97M 1,125,849 shares	0.01%	CUSIP change	SEC filing ↗ Aug 14, 2026	▾
05	BlackRock, Inc. CIK 2012383 · View history	$7.61M 1,074,524 shares	0.00%	-46.36K(-4.10%)Reduced	SEC filing ↗ Aug 7, 2026	▾
06	JPMORGAN CHASE & CO CIK 19617 · View history	$6.78M 966,797 shares	0.00%	-106.28K(-9.90%)Reduced	SEC filing ↗ Aug 12, 2026	▾
07	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$4.92M 693,934 shares	0.00%	+34.55K(+5.20%)Added	SEC filing ↗ Aug 12, 2026	▾
08	LMR Partners LLP CIK 1578621 · View history	$4.89M 690,702 shares	0.04%	0(0.00%)Unchanged	SEC filing ↗ Aug 14, 2026	▾
09	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$4.73M 667,968 shares	0.00%	-546.81K(-45.00%)Reduced	SEC filing ↗ Aug 14, 2026	▾
10	Hudson Bay Capital Management LP CIK 1393825 · View history	$4.17M 589,293 shares	0.02%	+137.01K(+30.30%)Added	SEC filing ↗ Aug 14, 2026	▾
11	Pacer Advisors, Inc. CIK 1616667 · View history	$4.07M 574,618 shares	0.01%	+574.62KNew	SEC filing ↗ Aug 13, 2026	▾
12	SUSQUEHANNA INTERNATIONAL GROUP, LLP CIK 1446194 · View history	$4.05M 571,832 shares	0.00%	+241.56K(+73.10%)Added	SEC filing ↗ Aug 14, 2026	▾
13	WINTON GROUP Ltd CIK 1612063 · View history	$3.57M 504,000 shares	0.12%	+7.70K(+1.60%)Added	SEC filing ↗ Aug 7, 2026	▾
14	MORGAN STANLEY CIK 895421 · View history	$2.92M 412,815 shares	0.00%	+127.27K(+44.60%)Added	SEC filing ↗ Aug 13, 2026	▾
15	Verition Fund Management LLC CIK 1454027 · Amended · View history	$2.65M 374,958 shares	0.02%	-70.00K(-15.70%)Reduced	SEC filing ↗ Aug 14, 2026	▾
16	VANGUARD FIDUCIARY TRUST CO CIK 933478 · View history	$2.59M 365,772 shares	0.00%	+65.36K(+21.80%)Added	SEC filing ↗ Aug 13, 2026	▾
17	Vennlight Capital Management, LP CIK 2013462 · View history	$2.50M 353,010 shares	1.68%	-222.49K(-38.70%)Reduced	SEC filing ↗ Aug 14, 2026	▾
18	STATE STREET CORP CIK 93751 · Amended · View history	$2.45M 346,696 shares	0.00%	+1.18K(+0.30%)Added	SEC filing ↗ Sep 22, 2026	▾
19	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$2.36M 333,599 shares	0.00%	-4.39K(-1.30%)Reduced	SEC filing ↗ Aug 14, 2026	▾
20	HIGHBRIDGE CAPITAL MANAGEMENT LLC CIK 919185 · View history	$1.71M 244,000 shares	0.06%	+244.00KNew	SEC filing ↗ Aug 14, 2026	▾

Showing 20 / 111 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

111

Cancelled or null records excluded

Disclosed shares

21,545,621

Not deduplicated across managers

Disclosed value

$151.33M

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/ · Q2 2026

Explore all 111 reporting institutions.

This page includes 20 of 111 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.

Download CSV
Earlier quarters
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 111 reporting institutions; totals use the complete disclosed data.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

akkru_institutional_holdings
{"action":"holders","cusip":"881454102","quarter":"2026Q2","type":"positions","page_size":100}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

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.