Terrestrial Energy Inc.

IMSR

Exchange: Nasdaq
Industry: Fabricated Plate Work (Boiler Shops)
SEC CIK: 0002019804

SEC filings (opens in a new tab)

No open-market purchases or sales by Terrestrial Energy Inc. insiders were filed in the last 90 days; 110 institutions reported holding it in 13F filings for Q2 2026, worth $151.3M in total; no superinvestor holds it.

Other share classesIMSRW

Q2 2025 vs. Q1 2025

How the institutions holding Terrestrial Energy Inc. changed between Q1 2025 and Q2 2025.

All holders in Q2 2025 All holders in Q1 2025

13F holders of IMSR: Q1 2025 compared with Q2 2025
Measure	Q1 2025	Of which not filed for Q2 2025	Q2 2025	Change
Holders	45	1	65	+21
Shares	20.2M	25.8K	18.8M	−1.42M (−7.0%)
Value	$213.4M	$271.3K	$209.6M	−$3.53M (−1.7%)

1 institution that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (29)

Institutions that held Terrestrial Energy Inc. at the end of Q2 2025 but not at the end of Q1 2025.

Institutions new to IMSR in Q2 2025
Institution	Shares	Value	% of portfolio
Vennlight Capital Management, LP	1,027,934	$11.4M	12.52%
Arosa Capital Management LP	560,000	$6.22M	4.54%
Shay Capital LLC	548,258	$6.09M	1.39%
Cantor Fitzgerald, L. P.	466,287	$5.18M	0.13%
Senator Investment Group LP	340,000	$3.77M	0.15%
MYDA Advisors LLC	300,000	$3.33M	0.93%
Governors Lane LP	300,000	$3.33M	0.46%
PEAK6 LLC	253,361	$2.81M	0.10%
Scoggin Management LP	200,000	$2.22M	1.03%
J. Goldman & Co LP	176,249	$1.96M	0.06%
Geode Capital Management, LLC	121,373	$1.35M	0.00%
Wexford Capital LP	100,000	$1.11M	0.31%
Massar Capital Management, LP	100,000	$1.11M	0.83%
Hidden Lake Asset Management LP	99,370	$1.10M	0.54%
Bluefin Capital Management, LLC	74,665	$828.8K	0.64%
Citadel Advisors LLC	69,721	$773.9K	0.00%
Shaolin Capital Management LLC	50,000	$555.0K	0.02%
JPMorgan Chase & Co	49,740	$552.1K	0.00%
Fifth Lane Capital, LP	45,000	$499.5K	0.60%
Yaupon Capital Management LP	35,139	$390.0K	0.03%
Patriot Financial Group Insurance Agency, LLC	18,850	$209.2K	0.02%
National Bank of Canada	12,568	$139.5K	0.00%
North Capital, Inc.	6,000	$66.6K	0.06%
Gordian Capital Singapore Pte Ltd	3,000	$33.3K	0.05%
Anchor Investment Management, LLC	2,100	$23.3K	0.00%
Federation des caisses Desjardins du Quebec	1,200	$13.3K	0.00%
Advisor Group Holdings, Inc.	200	$2.22K	0.00%
Tower Research Capital LLC (TRC)	105	$1.17K	0.00%
Citigroup Inc	50	$555	0.00%

Sold out (8)

Institutions that held Terrestrial Energy Inc. at the end of Q1 2025 and filed for Q2 2025 without it.

Institutions that sold out of IMSR in Q2 2025
Institution	Shares, Q1 2025	Value, Q1 2025
CNH Partners LLC	1,288,674	$13.6M
Encompass Capital Advisors LLC	946,165	$10.0M
Two Sigma Investments, LP	500,000	$5.26M
Athos Capital Ltd	200,000	$2.10M
Decagon Asset Management LLP	56,178	$591.0K
Glazer Capital, LLC	36,831	$387.0K
PenderFund Capital Management Ltd.	30,000	$295.9K
Clear Street LLC	165	$1.74K

Not filed for Q2 2025 yet (1)

Institutions that held Terrestrial Energy Inc. at the end of Q1 2025 and haven't filed a 13F for Q2 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding IMSR in Q1 2025 that haven't filed for Q2 2025
Institution	Shares, Q1 2025	Value, Q1 2025
Mizuho Securities USA LLC	25,837	$271.3K