Terrestrial Energy IMSR Institutional Ownership

NASDAQ IMSR

$4.74 -0.52 (-9.79%)

As of: Sep 11, 2026 · 3:59 PM EDT

Institutions by Trading Activity

110 Institutions

Increased 69 62.7%

Unchanged 19 17.3%

Reduced 22 20.0%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

20.65%

▼-5.37 pp QoQ

Shares Held by Institutions

21.87Mn

of 105.94Mn outstanding

▲+21.17% QoQ

Shares Outstanding

105.94Mn

84.06Mn held outside 13F filers

Institutional Investors

110

filed 13F for Jun 2026

▲+22 vs prior quarter

Net Shares Added (QoQ)

+3.82Mn

accumulated since last quarter

Value of Holdings

$112.66Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Terrestrial Energy Inc. /DE/ (NASDAQ:IMSR) is held by 110 institutional investors per 13F filings through June 2026.

Their combined ownership stood at 20.6% of outstanding shares in June 2026, down from 26.0% in March 2026.
They increased total shares held in IMSR by 21.17% quarter over quarter, and investors in Terrestrial Energy stayed flat from a year ago.
Among the 110 funds, 69 bought more Terrestrial Energy shares, 22 sold down, and 19 held their ground.
Institutional investors collectively held 21.87Mn shares in Terrestrial Energy as of June 2026, up by 3.82Mn shares quarter on quarter, and with no net change year over year.
VANGUARD CAPITAL MANAGEMENT LLC holds the largest position in IMSR at 3.41Mn shares as of June 30, 2026, or 3.22% of shares outstanding.
The biggest buyers of Terrestrial Energy for the quarter ending June 2026 included VANGUARD CAPITAL MANAGEMENT LLC (2.11Mn), UBS Group AG (1.28Mn), HRT FINANCIAL LP (1.13Mn), Pacer Advisors, Inc. (574.62K), Sixth Street Partners Management Company, L.P. (333.6K).
The biggest sellers of Terrestrial Energy for the quarter ending June 2026 included CITADEL ADVISORS LLC (1.27Mn), D. E. Shaw & Co., Inc. (546.81K), Alyeska Investment Group, L.P. (500.0K), Goldman Sachs Group Inc (336.81K), RENAISSANCE TECHNOLOGIES LLC (224.1K).
Business Quant data shows the 10 biggest positions in Terrestrial Energy as of June 2026 are held by VANGUARD CAPITAL MANAGEMENT LLC (3.41Mn), EXCHANGE TRADED CONCEPTS, LLC (2.16Mn), UBS Group AG (1.77Mn), HRT FINANCIAL LP (1.13Mn), BlackRock, Inc. (1.07Mn), Jpmorgan Chase & Co (966.8K), GEODE CAPITAL MANAGEMENT, LLC (693.93K), LMR Partners LLP (690.7K), D. E. Shaw & Co., Inc. (667.97K), Hudson Bay Capital Management LP (589.29K).

Form 13F Holdings

110 Institutional Holders

Report period 30 Jun, 2026

Total shares held 21.87Mn

Of outstanding 20.65%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	3,414,196	3.22%	▲2,110,744	+161.93%	$24.17Mn
2	EXCHANGE TRADED CONCEPTS, LLC	0001457320	2,160,074	2.04%	▲68,913	+3.30%	$15.29Mn
3	UBS Group AG	0001610520	1,772,173	1.67%	▲1,278,596	+259.05%	$12.55Mn
4	HRT FINANCIAL LP	0001475597	1,125,849	1.06%	▲1,125,849	0.00%	$7.97K
5	BlackRock, Inc.	0002012383	1,074,524	1.01%	▼46,361	-4.14%	$7.61Mn
6	Jpmorgan Chase & Co	0000019617	966,797	0.91%	▼106,276	-9.90%	$6.78Mn
7	GEODE CAPITAL MANAGEMENT, LLC	0001214717	693,934	0.66%	▲34,546	+5.24%	$4.92Mn
8	LMR Partners LLP	0001578621	690,702	0.65%	0	0.00%	$4.89Mn
9	D. E. Shaw & Co., Inc.	0001009207	667,968	0.63%	▼546,809	-45.01%	$4.73Mn
10	Hudson Bay Capital Management LP	0001393825	589,293	0.56%	▲137,006	+30.29%	$4.17Mn
11	Pacer Advisors, Inc.	0001616667	574,618	0.54%	▲574,618	0.00%	$4.07K
12	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0001446194	571,832	0.54%	▲241,556	+73.14%	$4.05Mn
13	WINTON GROUP Ltd	0001612063	504,000	0.48%	▲7,700	+1.55%	$3.57Mn
14	Morgan Stanley	0000895421	412,815	0.39%	▲127,266	+44.57%	$2.92Mn
15	Verition Fund Management LLC	0001454027	374,958	0.35%	▼70,000	-15.73%	$2.65Mn
16	VANGUARD FIDUCIARY TRUST CO	0000933478	365,772	0.35%	▲65,365	+21.76%	$2.59Mn
17	Vennlight Capital Management, LP	0002013462	353,010	0.33%	▼222,489	-38.66%	$2.50Mn
18	State Street Corp	0000093751	346,696	0.33%	▲1,176	+0.34%	$2.45Mn
19	Sixth Street Partners Management Company, L.P.	0001812095	333,599	0.31%	▲333,599	0.00%	$2.36Mn
19	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	333,599	0.31%	▼4,392	-1.30%	$2.36Mn

Showing 1 to 20 of 110 holders