Terrestrial Energy Inc.

IMSR

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

SEC filings (opens in a new tab)

In the last 90 days, Terrestrial Energy Inc. insiders filed 3 open-market purchases and 0 sales; 110 institutions reported holding it in 13F filings for Q2 2026, worth $151.3M in total; no superinvestor holds it.

Other share classesIMSRW

Key figures

Market capClose on Nov 9, 2026: $317.8M
Insider buysLast 90 days, $112.3K in total: 3
Insider sellsOpen market, last 90 days: 0
13F holdersQ2 2026, +22 vs. previous quarter: 110
13F valueReported value at the end of Q2 2026: $151.3M
Superinvestors holdingAt the end of Q2 2026: 0

Price chart

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Financials

See financial statements

From SEC filings, in USD.

Revenue, FY2025: –; No comparable prior period
Net income, FY2025: -$28.0M; No comparable prior period
Free cash flow, FY2025: -$17.5M; No comparable prior period
Revenue, Q2 FY2026: –; No comparable prior period

Short interest

See short data

From FINRA, settlement date Oct 15, 2026.

Short interest: 8.13M; Shares sold short
Change: +1.68M; +26.1% vs. previous
Days to cover: 4.65; At average daily volume

Superinvestors holding IMSR, Q2 2026

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No superinvestor reported holding IMSR at the end of Q2 2026.

Latest insider trades

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Open-market purchases and sales by Terrestrial Energy Inc. insiders from Form 4, newest first.

Insider trades
Filed (ET)	Trade date	Filing delay	Insider	Transaction	Shares	Avg price	Value	Holding change
Oct 15, 2026 (view filing)5:42 PM ET	Oct 14	1 day	Pardee Charles GDirector	PPurchase	+7.50K	$2.95	+$22.1K	+111.0%14.3K after
Oct 14, 2026 (view filing)9:15 AM ET	Oct 13	1 day	Irish SimonChief Executive Officer	PPurchase	+16.9K	$3.01	+$50.8K	+0.7%2.31M after
Oct 13, 2026 (view filing)11:06 AM ET	Oct 9	4 days	Buckman Frederick WDirector	PPurchase	+12.0K	$3.28	+$39.3K	+179.9%18.7K after

Top 10 13F holders, Q2 2026

See all 110 holders

The largest institutional positions in Terrestrial Energy Inc. at the end of Q2 2026; share changes are against Q1 2026.

Institutions holding IMSR in Q2 2026
Institution	Shares	Value	% of portfolio	Change in shares	Action
Vanguard Capital Management LLC	3,414,196	$24.2M	0.00%	+2,110,744+161.9%	Added
Exchange Traded Concepts, LLC	2,160,074	$15.3M	0.08%	+68,913+3.3%	Added
UBS Group AG	1,772,173	$12.5M	0.00%	+1,278,596+259.0%	Added
HRT Financial LP	1,125,849	$7.97M	0.01%	+1,125,849	New
BlackRock, Inc.	1,074,524	$7.61M	0.00%	−46,361−4.1%	Reduced
JPMorgan Chase & Co	966,797	$6.78M	0.00%	−106,276−9.9%	Reduced
Geode Capital Management, LLC	693,934	$4.92M	0.00%	+34,546+5.2%	Added
LMR Partners LLP	690,702	$4.89M	0.04%	00.0%	Unchanged
D. E. Shaw & Co., Inc.	667,968	$4.73M	0.00%	−546,809−45.0%	Reduced
Hudson Bay Capital Management LP	589,293	$4.17M	0.02%	+137,006+30.3%	Added

Holders of 5% or more of IMSR

See all 8 holders and filings

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Terrestrial Energy Inc..

Largest holders of IMSR from 13D and 13G filings
Holder	Latest form	Stake	Change	First filed	Latest filing	Filing
Sella Roberto Marco	13G	14.34%15.4M shares	New	Jan 22, 20261 filing	Jan 22, 2026	SEC
Irish Simon	13D	12.80%13.6M shares	New	Nov 4, 20251 filing	Nov 4, 2025	SEC
LeBlanc David Michael	13D	9.70%11.4M shares	New	Nov 4, 20251 filing	Nov 4, 2025	SEC
Linden Capital L.P.	13G	8.70%2.00M shares	New	Mar 31, 20251 filing	Mar 31, 2025	SEC
Picton Mahoney Asset Management	13G	8.61%1.98M shares	New	Oct 17, 20241 filing	Oct 17, 2024	SEC