Form 8-K

8-K — Terrestrial Energy Inc. /DE/

Accession: 0002019804-26-000013

Filed: 2026-07-21

Period: 2026-07-21

CIK: 0002019804

SIC: 3443 (FABRICATED PLATE WORK (BOILER SHOPS))

Item: Regulation FD Disclosure

Item: Financial Statements and Exhibits

Documents

8-K — tmb-20260721x8k.htm (Primary)

EX-99.1 (tmb-20260721xex99d1.htm)

GRAPHIC (tmb-20260721xex99d1g001.jpg)

GRAPHIC (tmb-20260721xex99d1g002.jpg)

GRAPHIC (tmb-20260721xex99d1g003.jpg)

GRAPHIC (tmb-20260721xex99d1g004.jpg)

GRAPHIC (tmb-20260721xex99d1g005.jpg)

GRAPHIC (tmb-20260721xex99d1g006.jpg)

GRAPHIC (tmb-20260721xex99d1g007.jpg)

GRAPHIC (tmb-20260721xex99d1g008.jpg)

GRAPHIC (tmb-20260721xex99d1g009.jpg)

GRAPHIC (tmb-20260721xex99d1g010.jpg)

GRAPHIC (tmb-20260721xex99d1g011.jpg)

GRAPHIC (tmb-20260721xex99d1g012.jpg)

GRAPHIC (tmb-20260721xex99d1g013.jpg)

GRAPHIC (tmb-20260721xex99d1g014.jpg)

GRAPHIC (tmb-20260721xex99d1g015.jpg)

GRAPHIC (tmb-20260721xex99d1g016.jpg)

GRAPHIC (tmb-20260721xex99d1g017.jpg)

GRAPHIC (tmb-20260721xex99d1g018.jpg)

GRAPHIC (tmb-20260721xex99d1g019.jpg)

GRAPHIC (tmb-20260721xex99d1g020.jpg)

GRAPHIC (tmb-20260721xex99d1g021.jpg)

GRAPHIC (tmb-20260721xex99d1g022.jpg)

GRAPHIC (tmb-20260721xex99d1g023.jpg)

GRAPHIC (tmb-20260721xex99d1g024.jpg)

GRAPHIC (tmb-20260721xex99d1g025.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: tmb-20260721x8k.htm · Sequence: 1

TERRESTRIAL ENERGY INC._July 21, 2026

0002019804false0002019804imsr:RedeemableWarrantsEachWholeWarrantExercisableForOneCommonStockAtPriceOf11.50PerShareMember2026-07-212026-07-210002019804imsr:CommonStockParValue0.0001PerShareMember2026-07-212026-07-2100020198042026-07-212026-07-21

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 21, 2026

TERRESTRIAL ENERGY INC.

(Exact name of registrant as specified in its charter)

Delaware

001-42252

98-1785406

(State or other jurisdiction

of incorporation)

(Commission File Number)

(IRS Employer

Identification No.)

2730 W. Tyvola Road, Suite 100

Charlotte, NC 28217

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (646) 687-8212

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act

Title of each class

Trading

Symbol(s)

Name of each exchange

on which

registered

Common Stock, par value $0.0001 per share

IMSR

The Nasdaq Stock

Market LLC

Redeemable Warrants, each whole warrant exercisable for one Common

Stock at a price of $11.50 per share

IMSRW

The Nasdaq Stock

Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 7.01 Regulation FD Disclosure

On July 21, 2026, Terrestrial Energy Inc. (the “Company”) made available the Company’s investor presentation to be used in general corporate and investor communications on the Company’s investor relations website at https://ir.terrestrialenergy.com. A copy of the investor presentation is also furnished as Exhibit 99.1 to this Current Report on Form 8-K.

The information set forth under this Item 7.01, including Exhibit 99.1, is intended to be furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing

Item 9.01 Financial Statements and Exhibits.

Exhibit

Description

99.1

Investor Presentation

104

Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: July 21, 2026

TERRESTRIAL ENERGY INC.

By:

/s/ Simon Irish

Name:

Simon Irish

Title:

Chief Executive Officer

EX-99.1

Filename: tmb-20260721xex99d1.htm · Sequence: 2

Exhibit 99.1

Delivering carbon-free thermal and electrical energy

J U L Y 2 0 2 6

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 2

Disclaimer

This presentation (this “Presentation”) has been prepared by Terrestrial Energy Inc. (the “Company”) solely for informational purposes. This Presentation is intended to provide a general overview of the Company and its business.

This Presentation should not be construed as a prospectus or offering document and it should not be relied upon or used to form the definitive basis for any decision, contract, commitment or action whatsoever, with respect to any proposed transaction or

otherwise. Any investment decision should be made based solely on the information contained in the Company’s filings with the Securities and Exchange Commission (the “SEC”), including the Company’s registration statements on Form S-1, Form S-4,

Form S-8, and subsequent Current Reports on Form 8-K, Quarterly Reports on Form 10-Q, and Annual Reports on Form 10-K, which identify risk factors that could cause actual results to differ materially from those contained in this Presentation. The

Company’s SEC filings are available on the SEC’s website at www.sec.gov. This Presentation shall not constitute an offer to sell or the solicitation of an offer to buy, or a recommendation to buy, any securities of the Company, nor shall there be any sale of

any securities of the Company in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

Nothing in this Presentation shall create any legally binding obligations on the part of the Company or constitute legal, tax, investment, or financial advice. Certain information contained herein has been derived from sources prepared by third parties or

the Company. While such information is believed to be reliable for the purposes used herein, none of the Company or their respective affiliates or representatives makes any representation or warranty with respect to the accuracy or completeness of such

information. The information contained in the third-parties citations referenced in this Presentation is not incorporated by reference into this Presentation.

The statements contained in this Presentation that are not purely historical are forward-looking statements. These forward-looking statements include, but are not limited to, statements regarding our expectations, milestones, hopes, beliefs, intentions or

strategies regarding the future. In addition, any statements that refer to projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking statements. The words “anticipate,”

“believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “will,” “would” and similar expressions may identify forward-looking statements, but the absence of these words

does not mean that a statement is not forward-looking.

The forward-looking statements contained in this Presentation are based on our current expectations and beliefs concerning future developments and their potential effects on the Company. There can be no assurance that future developments affecting

the Company will be those that we have anticipated. These forward-looking statements speak only as of the date of this Presentation and involve a number of risks, uncertainties (some of which are beyond our control) or other assumptions that may cause

actual results or performance to differ materially from those expressed or implied by these forward-looking statements. Factors that may cause actual results to differ materially from current expectations include, but are not limited to: (1) risks related to the

development, manufacturing and construction of IMSR Plants and key components, including potential delays, cost overruns and contractor performance issues; (2) the Company’s ability to obtain applicable regulatory approvals and licenses on a timely

basis or at all; (3) the ability of management to manage growth; (4) the possibility that the Company may be adversely affected by other economic, business, and/or competitive factors, including from alternative energy technologies, energy price volatility,

and competition from other advanced reactor developers; (5) potential supply chain constraints and cost inflation for specialized nuclear-grade materials and components; (6) any failure to comply with the laws and regulations governing the use,

transportation, and disposal of toxic, hazardous and/or radioactive materials; (7) changes in domestic and foreign business, market, financial and political conditions, and in applicable laws and regulations, including tariffs; (8) the ability to raise additional

funding in the future; (9) the outcome of any legal proceedings that may be instituted against the Company; and (10) other risk factors described herein as well as the risk factors and uncertainties described in the documents filed by the Company from

time to time with the U.S. Securities and Exchange Commission (the “SEC”).

The foregoing list of risk factors is not exhaustive. You should carefully consider the foregoing risk factors and the other risks and uncertainties described in the documents filed by the Company from time to time with the SEC. In addition, there may be

additional risks that the Company presently knows, or that it currently believes are immaterial, that could also cause actual results to differ from those contained in the forward-looking statements. Nothing in this Presentation should be regarded as a

representation or warranty, either express or implied, by any person that the forward-looking statements set forth herein will be achieved or that any of the contemplated results of such forward-looking statements will be achieved. You should not place

undue reliance on forward-looking statements, which speak only as of the date they are made.

The information contained in this Presentation is provided as of the date hereof and may change, and the Company and its representatives and affiliates specifically disclaim any obligation to, and do not intend to, update or revise any forward-looking

statements, whether as a result of new information, inaccuracies, future events or otherwise, except as may be required under applicable securities laws. Information contained on our website is not a part of or incorporated into this Presentation.

The Company and its affiliates, officers, employees, and agents make no representation or warranty, express or implied, as to the accuracy, completeness, or reliability of the information contained in this Presentation and expressly disclaim any liability for

any errors, omissions, or reliance on such information.

This Presentation may contain references to trademarks, service marks, and trade names belonging to the Company or other entities. Solely for convenience, such trademarks, service marks, and trade names may appear in this Presentation without the

®, , or ℠ symbols, but such references are not intended to indicate, in any way, that the Company or applicable licensor will not assert, to the fullest extent under applicable law, its rights to these marks.

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 3

Investment summary

The most capital-efficient SMR for rapid deployment at scale

Terrestrial Energy is an SMR developer whose proprietary Integral Molten Salt Reactor (IMSR), a Generation IV technology, delivers low-cost

nuclear energy. Its use of readily available LEU fuel, modular design for fast construction, and regulatory leadership position it for rapid deployment

at fleet scale.

Clean firm high-temperature thermal energy and electric power generated ~50% more efficiently

IMSR Plants supply clean firm thermal energy and electricity directly to industry. High-temperature (585°C) thermal energy supply delivers ~50%

greater steam-turbine efficiency than nuclear plants that use light-water reactor technology.

Capital-light model targeting a $2.3T Serviceable Addressable Market

Terrestrial Energy’s capital-light model captures a Serviceable Addressable Market growing to $2.3T by 2050 with revenues starting during site

development and construction, and extending 50+ years over IMSR Plant operating life with component, fuel, and O&M services supply

Decade plus track record of nuclear plant design, supplier and regulatory development

IMSR Plant now benefiting from Terrestrial Energy’s decade plus track record of design, supply chain and regulatory development. Company’s

management team has delivered multiple consequential milestones including those from engagement with U.S. and Canadian nuclear regulators

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 4

$1.6T

current SAM

Total serviceable addressable

market (SAM) for IMSR Plants is

expected to grow 47% to

$2.3T by 2050

OECD

industrial heat market

($1,200B)

OECD

electricity market

($1,100B)

The IMSR's unique attributes allow it to address both

industrial heat and electricity markets

Industrials require clean firm low-cost thermal energy at

high-temperatures for manufacturing processes. This is

beyond the capabilities of LWR nuclear plants and today it

is almost universally supplied with fossil fuel combustion

IMSR Plants have high-temperature thermal output, creating

an alternative to fossil fuel combustion in many industrial

processes. This also enables electricity generation at up to

50% higher efficiency than LWR nuclear plant for

transformative economic improvement

IMSR Plants have a 50+ year operating

life, which is more competitive than coal-fired power generation fuel supply,

inclusive of coal and transportation costs

IMSR Plant heat supply systems can be customized

without requiring nuclear regulatory re-approval,

to deliver a customized mix of high-temperature heat

and low-cost electricity for industrial use

IMSR Plant provides clean firm electric

power for industry and municipal use. It is

a logical solution for near- and co-located

large data center supply and for coal plant

replacement, two large markets

IMSR Plant design is smaller to be right-sized

for today’s deployment opportunity and

modular in design for fast construction and

decentralized generation at individual industrial

sites, coal plant sites, data centers, for grids

IMSR Plant output can rapidly load-follow (i.e.,

adjusts its output to demand) for hybrid installations

integrating intermittent renewable generation to

deliver clean firm power to grid

IMSR Plants enable distributed generation

as they are deployable at or near industrial

site, including “behind the fence” for

dedicated industrial heat and power supply

Firm & Low-Cost High Temperature

50+ Year Life

Customized

Modular Clean

Load Following

Deployable

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 5

IMSR Plant is designed

for fast delivery of

energy solutions to

industry

Separation of nuclear from thermal

and electrical systems allows:

• Allows end-user flexibility to customize

thermal and electricity supply

• Provides an attractive pathway for coal plant

conversion

• Allows for hybridization with other energy

systems, including natural gas and

renewables, facilitating the delivery of electric

power within five years.

Standardized IMSR Nuclear Facility

• Subject to nuclear regulation

• Standardized, simplified design reduces costs

• 822 MW (net) thermal energy production from twin IMSRs

Customized non-nuclear Thermal and Electric Facility (TEF)

• Converts thermal energy to 585°C 822 MW (net) thermal or 390 MW (net) electric

power for commercial supply – or any heat/electric power mix in between

• Steam turbines operate at ~50% greater efficiency than in a plant employing LWRs

• Separate Nuclear Facility & non-nuclear Thermal and Electric Facility (TEF) enables

the potential to integrate natural gas as a bridge to rapid commercial operation and

use as back-up during nuclear systems’ operation

Near and co-located generation

• Data centers

• Chemical and petrochemical plant

• Other industrials requiring clean firm heat &

power

Prospective off-takers

• Electric grid, from coal conversion

HEAT POWERConversion loss

HEAT

585°C

Principal flow

of energy

822 MWt

(thermal)

390 MWe

(electrical)

585°C

Dual IMSR Nuclear

Facility

End-user heat / power (industry

/ grid electric power)

IMSR Non-nuclear Thermal and

Electric Facility (TEF)

Note: Example is for a dual reactor IMSR Plant. Scaling up is possible.

Source: Company internal view

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 6

The IMSR Plant has the operational

capability to supply three key, large market

verticals

Many markets showing clear policy support

for nuclear energy

Industrial heat and power

Today, thermal energy (heat) for industrial processes is produced almost entirely from combustion of oil,

coal, and natural gas – presenting a large replacement market to be filled with IMSR Plants.

Coal plant replacements

IMSR Plant at 390 MWe is suitably sized for data centers, industrial applications, and grid applications,

including replacing aging fossil fuel plants. IMSR Plant is land-efficient – requiring a fraction of the

physical footprint of LWR technology – which further increases siting flexibility.

IMSR Plant innovation reaches new markets and sectors

The IMSR Plant is small and modular for fast construction and ease of

deployment. It is ideally suited for deployment close to point of demand,

whether a data center, large industrial plant requiring heat and/or power, or for

grid generation at points of congestion, generating clean firm electric power

with high efficiency while reducing grid congestion.

Data center power supply

Increasing demand for computing driven by the AI industry requires near- and co-located clean firm

power. IMSR Plants can be installed at near-location sites to supply electricity to data centers at giga-watt scale with baseload reliability, high-efficiency, and zero emissions.

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 7

Terrestrial Energy IMSR

Gen IV Molten Salt Reactor (MSR)

Gen IV High Temperature Gas

Reactor (HTGR)

Best-in-class SMR capital efficiency:

• ~585 ˚C operational temperature,

delivers ~44% (net) thermal efficiency

• Low-pressure operation easing design

requirements, lowering manufacturing

costs

• High inherent safety

• High power density captures best

practices in modular design for fast

construction and economic performance

Lower Supply Chain Risk:

• Uses Standard fuel – LEU (<5%

enrichment)

• Fuel widely available, no exotic fuel

suppliers and bottlenecks to fleet scale,

no single point of failure in the supply

chain

Lower capital efficiency due to:

• Expensive high-pressure helium cooling

systems with inefficient heat transfer

limits thermal efficiency to <40% (net)

• Large pressure vessels and oversized

containment systems limits use of

modularity in design

• Comparatively low power-density,

results in larger reactor components

and poor modularity capabilities

Constrained Supply Chain:

• Requires TRISO with HALEU (15-20%

enrichment)

• Nascent supply chain. Limited

qualified vendors. Constrained

production capacity

Terrestrial Energy’s

IMSR Plant addresses

the weaknesses and

limitations of LWR

technology with best-in-class Gen IV

reactor technology

While Gen IV reactors are defined by

international accord as having capabilities

to outperform Gen III reactors (LWRs),

MSR has potential to outperform in the

Gen IV class from the unique triple

advantage of high-temperature and low-pressure operation with high inherent

safety.

Terrestrial Energy has captured this triple

advantage to deliver the most capital

efficient SMR in its sector and with its use

of LEU the most deployable at scale.

Favorable Regulatory Positioning:

• Full review by CNSC, a first for a Gen IV

SMR

• Two NRC topical reports approved

No previous licensing for HTGR:

• Mixed commercial Opex

• Full review by CNSC, a second for a

Gen IV SMR

Gen IV Sodium Fast Reactor

(SFR)

Lower capital efficiency due to:

• Low pressure but lower temperature

operation reduces efficiency to <40%

(net)

• Complexities of safe fast reactor

operation and management of 1000’s

tonnes of hot liquid sodium drive costs

• Comparatively low power-density,

results in larger reactor components

and poor modularity capabilities

Constrained Supply Chain:

• Requires HALEU (15-20%

enrichment) fuel at commercial scale,

subject to material bottlenecks and

geopolitical risk

Mixed regulatory history:

• Mixed safety and commercial Opex

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 8

Use of a molten salt coolant

and fuel delivers high

inherent safety

• Negative temperature

coefficient of reactivity for

inherent power control and

load-following

• Fluid convection supports

passive dissipation of fuel heat

High inherent safety

in Plant operations

IMSR plant’s technology and

design choices drive

large economic advantages

High thermal stability of molten salt enables safe high-temperature and low-pressure operation with high inherent

safety, which drives high capital and operating efficiencies,

as well as power plant revenue and profitability

M O LT E N S A LT C O O L A N T

The superior reactor coolant

• High thermal stability

• High radiation stability

• High heat capacity

B C

No high-pressure nuclear

systems, structures,

or components

• Plant simplification

• Lower costs, quicker

construction time and more

financeable

Low pressure

Lower Plant Capex

Operates at high

temperature for up to 50%

greater steam turbine

efficiency vs. LWR

technology

• Generates up to 50% more

kWh(e)s for more revenues

• More capital efficient and

profitable operation

High temperature

Increased Plant revenues

TEF flexibility enables integration of natural gas as a bridge

to early commercial operation and use as back-up during

nuclear systems’ operation

The IMSR Plant at 390 MWe is ideally suited for data

centers, industrial applications, and grid applications,

including replacing fossil plants

The IMSR Plant is a modular design for factory-built

components and faster on-site assembly. It is land-use

efficient – requiring a fraction of the physical footprint of

conventional plants – enabling siting flexibility, lower capital

costs, and shorter construction schedules

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 9

All primary reactor components will be contained in

the sealed and replaceable

“Core-unit”

Core-unit replaced

every 7 years

Primary Heat

Exchangers

Flow of salt

Passive cooling

system

Graphite Moderator

Key innovation is integration of all primary reactor

components into a sealed, compact and replaceable

reactor vessel designed to have a 7-year operating life:

• Reactor graphite core

• Primary heat exchanger

• Pumps

This “integral” design captures commercial

value through:

• Maintenance simplicity of “plug-and-play”

• High capital efficiency

IMSR Plant has strong IP

• 90 patents pending or granted across 6 invention families

01 IMSR Core-unit cut-away (illustrative) 02 Cut-away reactor building, one of two

in the IMSR Plant (illustrative)

The sealed IMSR Core-unit innovation delivers safety

and operational simplicity for commercial operation

Each Reactor Building houses one reactor operating in

one of two operating silos along with storage for six IMSR

Core-units arranged in two rows of three.

At the end of each 7-year cycle, the spent IMSR Core-unit is

swapped with a new one previously installed in the adjacent

operating silo in a planned, safe, and efficient manner.

Consequently, eight IMSR Core-units can be operated

sequentially over the 56-year plant lifetime

Innovative and Patented Replaceable IMSR “Core-unit” Solves the Key

Industrial Maintenance Challenge for the MSR, Releasing the technology’s

commercial potential

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 10

Thermal spectrum

Fluoride salt chemistry

Graphite moderator

SALEU-fueled once-through fuel cycle

Integral reactor core

architecture

IMSR is Built on 65 Years

of National Lab Proven and Demonstrated MSR Technology

IMSR is a molten salt

reactor that uses:

1958-1969

Molten Salt Reactor (MSR) research

program started in the 1950s1, 2

• Molten Salt Reactor Experiment

(MSRE) at Oak Ridge National

Laboratory (ORNL) highly

successful and lays foundation for

future molten salt reactor designs

• Built/operated for 13,000 hours

1980

• Denatured Molten Salt Reactor

(DMSR)3 conceptual design

developed at ORNL

• Key innovation: Use of SALEU

with a once-through fuel cycle

for strong proliferation defenses

>2012

Terrestrial Energy’s IMSR combines

these critical innovations

• Use of SALEU fuel with a once-through fuel cycle

• Integral core architecture

2010

• ORNL pre-conceptual design for

Small Modular Advanced

High-Temperature Reactor

(Sm-AHTR), using solid fuel and

molten salt cooling4

• Key innovation: Cartridge core

design

1. “A Look Back: The Molten Salt Reactor Experiment.” ORNL, 01 June 2016, https://www.ornl.gov/molten-salt-reactor/history.

2. “ORNL-2474 Molten-Salt Reactor Program Quarterly Progress.” ORNL, https://energyfromthorium.com/pdf/MSRP-TOC.pdf.

3. Engel et al. “Conceptual Design Characteristics of a Denatured Molten-Salt Reactor with Once-Through Fueling.” ORNL, July 1980, https://www.osti.gov/servlets/purl/5352526.

4. Greene et al. “Pre-Conceptual Design of a FluorideSalt-Cooled Small Modular Advanced High-Temperature Reactor (SmAHTR).” ORNL, Dec. 2010, https://info.ornl.gov/sites/publications/files/Pub26178.pdf.

Source: ResearchGate; ORNL; Company

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 11

Compared to LWR

Technology, IMSR Offers

Transformative Advantages

on a Range of Technical

and Economic Factors

Coolant Molten Salt Water

Temperature of

Thermal Supply 585°C ~270°C

Net Thermal Efficiency

of Electricity Generation 44% ~30%

Pressure Low: 1 bar (atmospheric) High: 55-150 bar

Application Industrial heat & electric power Electric power only

Modularity Standardized, factory prod. Bespoke on one-off basis

Inherent load-following Yes No

Construction &

Commissioning Time Under 4 Years ~10 Years

Unit Capital Cost ~$1-2 B upfront1 Over $10 B upfront

Capacity (net) 822 MWt / 390 MWe 1,000+ MWe

Levelized Cost of Heat

($/MMBTU) 8.60 N/A

Levelized Cost of

Electricity ($/MWh) 69 Over 140

Fuel Cycle 7 years 18-24 months

Waste 32% less fission product

waste per kWh(e) by mass Baseline waste quantities

IMSR's key technology advantage is from

the use of a molten salt coolant and fuel

Molten salt is a superior coolant relative to

traditional cooling mechanisms of LWR

technology (based on water, pumps,

actuators, etc.) and is foundational to the

compelling economic and use-case

advantages of the IMSR Plant

IMSR Plant LWR Plant

1. Range for IMSR reflects estimated unit capital cost to the owner-operator at Nth Commercial Plant (NCP) status based on Terrestrial Energy internal estimates.

2. “Levelized Cost of Energy+.” Lazard, June 2024, https://www.lazard.com/media/xemfey0k/lazards-lcoeplus-june-2024-_vf.pdf.

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 12

Business Model

Revenues start well before construction at site development project stage and last for the entire operation of the plant

Terrestrial Energy’s customers are

site developers, IMSR Plant project

developers, and owner-operators

Terrestrial Energy’s

business is to:

Supply engineering services for

construction and operation of IMSR

Plants

Supply key nuclear components and

fuel for construction and operation of

IMSR Plants

Provide a long-term supply of

replacement IMSR Core-units

and IMSR fuel, as well as

operating and maintenance (O&M),

and decommissioning services

Full project lifecycle

Site and Project Development IMSR Plant Operations

Development Scope and Services

• Supply of services

• Supply of components

Life of Plant Services

• Terrestrial Energy’s scope: 30%

of total IMSR Plant cost

• EPC Firms, component suppliers,

service providers: 70% of IMSR Plant

cost

• IMSR Core-unit supply every 7 years

• IMSR Plant O&M services

• IMSR Fuel Salt

• Refueling services

56-year plant life

Site selection &

Feasibility Contract

Site-specific Engineering and

Licensing Support Contract

Engineering Construction and

Procurement Contract

IMSR Plant

Maintenance Contract

IMSR Plant

Supply Contract

Supply of

IMSR Core-units

Customer A

Investors

Customer B

Investors

Pre-construction revenues Construction

Plant 2

Plant 3 …

Plant 2

Plant 3 …

Plant construction is financed by IMSR Plant site and project

developers, and off takers

End-users are industrial, technology, municipal, and utility off takers

requiring firm, clean, low-cost high-temperature heat and/or electrical

power from a near-site location

Standardized and modular nuclear systems and components support

fast plant construction, and time and cost efficiencies when scaling

deployment across multiple sites with minimal site-specific

customization of nuclear systems

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 13

Uranium-235

enrichment level

Cost

Typical use case

Regulatory

requirements

Key suppliers for

fleet deployment

15-20% U-235

$32,600 / kgU2

Most other Gen IV reactors today require

HALEU at 15-20% U-235

Complex and uncertain (many regulatory protocols such

as waste disposal and transport not yet developed)

US production insignificant compared to required quantities.

Existing enrichment facilities cannot be modified to produce

HALEU (15-20), entirely new facilities with higher Class 2

security3 will require years to establish at high cost.

High-Assay Low-Enriched Uranium

HALEU (15-20)

Low-Enriched Uranium

LEU1

<5% U-235

$2,700 / kgU1

Terrestrial Energy IMSR (Gen IV), Gen II/III/III+

(light-water reactors)

Known and straightforward (both production

and transportation)

Centrus (US)

Framatome (US)

Global Nuclear Fuel (US)

Westinghouse (US) / Springfields (UK)

Orano (Europe)

Urenco (Europe)

IMSR uses readily-available and inexpensive low-enriched uranium (LEU)

in its fuel

1. Also referred to as “SALEU” or standard assay low enriched uranium, which contains less than 5% U-235

2. Norman et al. “How Much Does it Cost to Develop New Nuclear Fuel Capacity.” Third Way, 28 June 2023, https://www.thirdway.org/blog/how-much-does-it-cost-to-develop-new-nuclear-fuel-capacity.

3. “Physical Security Requirements for Facilities with Category II Quantities of Special Nuclear Material Informational Sheet.” NRC, https://www.nrc.gov/docs/ML2117/ML21172A282.pdf.

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 14

IMSR’s triple advantage – high-temperature, low-pressure operation with high

inherent safety – and using LEU to deliver best-in-class capital efficiency with

speed to fleet scale

IMSR heat supply is best-in-class, vs

270-299 °C from Gen III+ and

440-585 °C from other Gen IV

competitors

585 °C

Electricity is generated up to ~50%

more efficiently than light water reactor

nuclear power plants

44% vs 30%

Exceptional levelized cost of heat

(LCOH) $8.6 per MMBtu1

$8.6

Exceptional levelized cost of electricity

(LCOE) $69 per MWh(e)1 for

dispatchable/ base load applications

$69

IMSR Plant provides co-located or near-location cogeneration at industrial scale

(822 MWt / 390 MWe net)

822 MWt

IMSR builds on over 65 years

of proven, prototyped and

demonstrated molten salt technology

using innovative enhancements applied

to the U.S. DOE’s Oak Ridge National

Lab’s base design

65 years

Long operational life of

IMSR Plants

50+ years

IMSR Plant uses low enriched uranium

(LEU) in its fuel, readily available from

North American and Western European

sources

Fuel at standard

enrichment

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 15

Blue-chip service and major component

suppliers support deployment readiness

Awards to top-tier suppliers of engineering

and operations services inspire nuclear

market confidence

Plant &

Infrastructure

Nuclear fuel

R&D and

System

Testing

Graphite

Services

* *

Predominantly U.S. supply chain enables

best use of local economic benefits and tax

credits

*Tier 2 supplier; subcontractor to Westinghouse

Contracts entered with

leading group of suppliers

for services and

components

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 16

Terrestrial Energy is scaling up its IMSR plant project pipeline

Recent commercial developments

Mining

Ammonia and

hydrogen

Data

centers

Capital

goods

Utilities

Industrials

CNSC VDR

April 2023

MOU

November 2024

Public

Announcement

February 2025

10+ Projects

• Off-takers/customers

• Consortium Partners

• Site owners

15+

10 projects already formed from 15+ consortium

relationships involved in projects, including potential

customers seeking IMSR to meet power requirements

and capable of delivering further projects.

50+

Portfolio of 50+ consortium

relationships with the potential to

deliver additional projects to

deploy IMSR Plants covering a

range of deployment use-cases

including co-location for data

center power supply, co-located

industrial plant heat and power

supply, and distributed on-grid

generation

Basic

materials

Petrochemicals

and plastics

Marine

propulsion Chemicals

Fossil fuel

retrofits Merchant

power

Public

Announcement

June 2025

Public

Announcement

September 2025

Public

Announcement

November 2025

Public

Announcement

September 2025

Public

Announcement

May 2026

Public

Announcement

June 2026

Public

Announcement

May 2026

Completion of

CNSC’s regulatory

review of

IMSR Plant

Signs MOU to collaborate

on IMSR Plant development

and deployment

Texas A&M announces

plans to site a commercial

IMSR Plant at its RELLIS

campus

Partners with Ameresco for

US site identification,

project development,

design, licensing,

construction and operation

of IMSR plants

NRC completes Safety

Evaluation of IMSR

Principal Design Criteria

and approves Topical

Report

Signed contract with

Westinghouse supporting

IMSR fuel supply chain

development

Selected for DOE Office of

Nuclear Energy Advanced

Pilot Program and Fuel Line

Pilot Program, advancing

IMSR nuclear supply chain

strategy

NRC issues its Safety

Evaluation Report (SER)

approving the Company’s

Postulated Initiating Events

(PIE) Topical Report

Texas A&M signs site and

R&D agreements to

facilitate testing and cover

projects, including the

planned commercial IMSR

Plant.

Announces collaboration to

develop a best-in-class

pairing of data centers with

co-located advanced

nuclear plants targeting

4GWe.

Market demand and policy

developments are driving

deployment in major markets

Terrestrial Energy recent

developments illustrate path-to-market, and strategy for

fast deployment of an IMSR

Plant fleet operating in the

2030s

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 17

Tracking 2026 guidance. Catalysts and positioning for long-term growth

Engineering

developments &

regulatory approvals

• NRC approves Principal Design Criteria and Postulated Initiating Events

methodology Topical Reports and issues Safety Evaluation Reports (SER)

• Submission of at least two further IMSR Topical Reports each further

readiness of NRC operating license application

• Construction of DOE partnership TETRA pilot reactor

• Construction and operation of DOE partnership TETRA pilot reactor

• Submission and approval of NRC Construction Permit for commercial

IMSR Plant unlocks construction start and construction-phase revenues

• Testing data from NRG, TETRA and others, including testing at Texas

A&M, advances readiness for NRC Operating License applications for

commercial plant operation

• Readiness for NRC Operating License demonstrated through series of

Topical Report submissions and NRC SER issuance.

• NRC Operating License approvals unlock commercial operation of IMSR

Plants, operating-phase revenues, and a clear path to repeatable

construction and licensing process for further plants and deployment at

scale

Supply Chain

developments and

expansion

• Suppliers announced for TETRA & TEFLA, including for engineering and

construction, and for component and fuel supply

• Graphite irradiation testing at NRG Petten advances for material

qualification

• Construction and operation of DOE-partnership TEFLA fuel line pilot

establishing blueprint for proprietary fuel production

• Sites and suppliers for IMSR Core-unit manufacturing and fuel production

plants selected and construction commences supporting commercial

operations of first IMSR plants

IMSR Plant project

pipeline developments

and expansion

• Riot Platforms MOU partnership established for best-in-class SMR and

data center pairing incorporating use of NG supply bridge

• Details of 1 to 3 additional IMSR Plant projects to be announced in FY

2026 expanding indicative power capacity of project pipeline

• Land-use & R&D agreements announced with the Texas A&M System to

secure site control of ~44 acres at RELLIS enabling completion of site

characterization studies required for NRC Construction Permit application

• Engineering & project management office opened at RELLIS

• Series of preliminary power off-take contracts and MOUs catalyze IMSR

Plant project formation driving project development to pre-construction

and construction phase revenues

• Milestone-rich IMSR Plant project development schedules repeatedly

demonstrates supplier, construction and regulatory execution, as well as

market-demand pull across data center, industrial heat, and coal-replacement SAM verticals

• Progress with initial IMSR plant projects from start of construction and

operation become powerful catalysts for IMSR Project portfolio expansion

to fleet scale deployment in 2030s with a path to a ~$2.3 SAM in 2050

P I L L A R S 2 0 2 6 D R I V E R S E X P E C T E D F U T U R E D R I V E R S

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 18

~$2.7B 33% 100%

Cumulative

Totals

$477 26% 17%

Construction

services &

component supply

Supply of services and components

as set out in the Company’s Product

Delivery Model for construction and

commissioning of an IMSR Plant

$1,578 33% 58%

Post-construction

IMSR Core-unit

supply

Supply of replacement IMSR

Core-units every seven years.

Contracted ongoing O&M services to

the power plants for the duration of

operational life (50+ years)

$583 40% 21% Post construction

IMSR fuel supply

Supply of IMSR Fuel Salt for the

ongoing operation of an IMSR Plant

$98 23% 4% Pre-construction

services

Site selection, site and use-specific

engineering studies for construction

and licensing planning preparation

Cumulative

revenue $M

% of Revenue

Gross Margin

Segment Description

Terrestrial Energy’s

capital-light business

model taps four revenue

streams across the

IMSR Plant’s

50+ year lifecycle and

starts before construction

Note: Unit economics reflect Terrestrial Energy management estimates at NCP status.

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 19

Terrestrial Energy’s Capital-Light Business Model Taps Four Revenue Streams

Across the IMSR Plant’s 50+ year Lifecycle

Pre-Construction Construction Operating

Pre-construction services

Gross

Margin

26% $98

$1,381

$460

Revenue

Gross Profit

$98 $797 $1,840

$23 $240 $644

Post construction IMSR fuel

supply

33% $197 $1,381 Post-construction IMSR Core-unit supply

40% $123 $460

Construction services &

component supply 26% $477

$98

T-4 T-3 T-2 T-1 T-0 T+1 T+2 T+3 T+4 T+5 … T+56

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 20

Terrestrial Energy Leadership

A proven leadership team

A leadership team with extensive experience across scientific, commercial, and policy realms

Simon Irish

CEO, Director

• Extensive investment banking

and investment management experience

• Former U.S. investment head

of a leading global

investment business

David LeBlanc, PhD

CTO, Director

• Globally recognized expert on molten salt

reactors

• Sole private sector member to Gen IV

International Forum

inter-government research group on

advanced reactors

William Smith, P. Eng.

COO

• Over 40 years of experience in nuclear energy

• Former SVP of Siemens Energy Canada

• Former VP at Ontario Power Generation

Brian Thrasher, CPA

CFO

• Over 25 years of financial management

experience holding executive management

positions at multibillion-dollar companies

• Former CFO at Hilco Transport, Inc.

Robin Rickman

VP Business Strategy

• Over 40 years of nuclear experience,

including with U.S. Navy/DoD, U.S. DoE, and

private sector

• Former Director of Westinghouse New

Reactor Projects

Sarfraz Taj

VP Business Development

• Over 20 years of nuclear experience,

including supporting operating reactors,

project development, and corporate

transactions

• Former Director of M&A and Strategic

Projects at Constellation Energy

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 21

Iftikhar Haque

VP Nuclear Supply Chain

• Over 35 years of supply chain experience,

over 20 in the utilities sector as a supply

chain leader

• Former VP supply chain at multiple utilities

and suppliers

David O’Keefe

VP Business Development & Project Management

• Over 25 years of experience in the energy

industry, including the nuclear fuel cycle and

wholesale electric power

• Former Director of Business Development at

Centrus Energy Corp

Frank Akstulewicz

Licensing Manager

• Over 40 years of experience with the

NRC, serving in numerous executive

leadership and staff positions within the

agency

• Former Branch Chief of the Nuclear

Performance and Code Review Branch in

NRR

Dara Harrison

VP Human Resources

• Over 20 years of human resources experience

supporting the engineering and energy

industries within the United States and Canada

• Former HR leader at many companies including

Eaton, AtkinsRéalis and Fluor

Jim Howe

VP Government Relations

• Over 20 years of experience in

Washington, DC, serving in government

affairs, policymaking, advocacy, and

communications roles

Terrestrial Energy Leadership

A leadership team with extensive experience across scientific, commercial, and policy realms

A proven leadership team

• More than 30 years of external affairs

experience for publicly traded companies in

technology and life sciences.

• Former VP External Affairs at Wolfspeed; VP

Communications, Pharma Services at

Thermo Fisher Scientific

Tyler Gronbach

VP IR and PR

Terrestrial Terrestrial Energy Inc. Proprietary Information Energy Inc. Proprietary Information -- All Intellectual Property Rights Reserved. All Intellectual Property Rights Reserved. 22

Most capital-efficient SMR

Proprietary Gen IV IMSR technology incorporating tested and demonstrated DOE

molten salt technology, fueled with LEU for fast deployment at scale

$2.3T SAM by 2050

Data center power, industrial heat, and coal replacement across OECD markets —

with early-mover advantage in each vertical

Capital-light, high-margin revenue model beginning before

construction

Speed-to-market in 2030s at fleet scale, with per-plant revenue beginning at site

development and recurring across a 50+ year operating life

Plant, supplier and regulatory milestones

Track record of design, supply chain and regulatory developments delivering

multiple consequential milestones

Compelling demand tailwinds

AI data center growth, grid reliability, and energy security are driving secular

changes and unprecedented demand for clean firm power and SMR innovation

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 23

Glossary

Term Definition

Base load The minimum amount of electric power delivered or required over a given time period at a steady rate.

Core-unit The term to denote the vessel that contains the primary components of the IMSR, the reactor core, heat exchangers, pumps, etc.

DOE and LPO The United States Department of Energy, and its affiliated Loan Programs Office, which provides loan guarantees to assist in financing energy infrastructure projects.

FCP/NCP An engineering concept referring to First Commercial Plant and Nth Commercial Plant, reflecting the reduction in price as processes mature and companies proceed along the learning curve. Terrestrial Energy’s unit

economics are based on NCP estimates, projected to be achieved at the 20th IMSR Plant.

Full lifecycle The full lifespan of a specific plant, including pre-construction, construction, operations, and decommissioning.

Gen IV

Generation IV nuclear technology, which improves upon Generation III+ technologies (current reactors) through two important improvements: 1) ability to generate high-temperature heat (>400 °C) appropriate for use

in industrial applications, and 2) high inherent safety incorporated into the design, versus active and passive safety systems of previous generations. Generation IV technology governed by the Generation IV

International Forum, an intergovernmental forum representing 40 countries.

HALEU (15 -20) HALEU (15 – 20) stands for “High-Assay Low Enriched Uranium” enriched to 15-20% (>15% is required for several other Gen IV nuclear technology)

LEU aka SALEU LEU stands for “Low Enriched Uranium,” it is also referred to as “SALEU” or standard assay low enriched uranium, which is U-235 which has been enriched to <5%. Currently. SALEU is readily commercially available

from North American and Western European suppliers.

Inherent safety A proactive approach to process safety in which hazards are eliminated or lessened to reduce risk without engineered or procedural intervention. A nuclear reactor with high inherent safety may rely upon natural

phenomenon such as natural circulation or negative feedback power coefficients to achieve a safe state as opposed to older plants that use active safety (e.g. pumps, actuators, valves) to manage risk.

kWe/MWe vs. kWth/MWth The distinction between power being generated for electricity (“e”) versus for thermal/heat (“th”). Generating electricity is a direct function of the thermal efficiency of the plant. In the IMSR’s case, the plant generates

822 MWth or 390 MWe.

kWh/MWh Kilowatt-hour / megawatt-hour, or the production of that amount of energy for an hour.

LCOE Levelized cost of electricity. A measure of the all-in cost of electricity generation to the owner/operator over the life cycle of the plant, including upfront CAPEX, ongoing OPEX, etc.

LWR aka Legacy nuclear Nuclear reactor technologies used in the market today, such as Boiling Water Reactors and Pressurized Water Reactors. They are classified as “Generation III+” or below.

Load-following A power plant that can adjust its power output on demand.

U.S. NRC / CNSC United States Nuclear Regulatory Commission and Canadian Nuclear Safety Commission, respectively, government agencies of their respective countries tasked with regulating civilian uses of nuclear energy.

OECD Organisation of Economic Co-operation and Development, a multilateral organization of 38 member countries, the majority of which are high-income economies.

Utilization factor A measure of “uptime” for a facility, which reflects total operating time less planned and unplanned downtime for maintenance, etc. Utilization factors of 90-95% are typical for nuclear power plants.

VDR Vendor Design Review. A voluntary high-level review process offered by the CNSC to provide pre-licensing feedback regarding the extent to which the reactor design meets CNSC requirements.

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 24

1. US EIA, International Energy Outlook, World total primary energy consumption by region (reference case)

2. German Energy Agency (dena), Powerfuels in Industry: Process Heat (20% of all heat being industrial process heat) multiplied IEA, Industrial heat demand by temperature range (50% of industrial process heat being up to 400 °C, an

underestimate as IMSR can supply up to 585 °C)

3. Conversion factor, i.e. mathematical constant

4. Assumption of uptime, i.e. operating time less maintenance and other downtime events, calculated as 24 hours/day × 365 days/year × 95% utilization factor

5. Cost of constructing and operating the IMSR Plant are the same regardless of whether the end customer elects to use it for heat or electricity

Primary energy

consumption

(Quadrillion BTUs)1

Implied number

of IMSR Plants

Implied SAM

(US$ T)

10% of primary energy

consumption is high-temp

industrial process heat2

2.93 × 108 MWh / quad3

822 MWth

$931 M / IMSR Plant5

US EIA has estimated 248

quads of primary energy

consumption in 2025, growing

to 281 quads by 2050

Current market size implied

to be ~1,000 IMSR Plants,

growing to >1,200 by 2050

Cumulative upfront and

average annual recurring

revenue to Terrestrial Energy

per IMSR Plant

Implied serviceable

addressable market (US

trillions)

8,322 hours / year

(95% utilization factor4

)

× = × =

248 281

420

605 Non

OECD

668

886

1,062

1,205

$1.0 $1.2

2025 2050 2025 2050 2025 2050

High-temperature, High-quality Industrial Process Heat in OECD is a Primary

Market

Terrestrial Energy Inc. Proprietary Information - All Intellectual Property Rights Reserved. 25

1. McKinsey & Company, What will it take for nuclear power to meet the climate challenge?

2. US EIA, calculated share of nuclear electricity installed generating capacity OECD and World

3. Cost of constructing and operating the IMSR Plant are the same regardless of whether the end customer elects to use it for heat or electricity

Demand for

nuclear power

(GWe)1,2

Implied number

of IMSR Plants

Implied SAM

(US$ T)

277

479

693 Non

OECD

2023

1,172

2050

1,000 MWe / GWe

390 MWe / IMSR Plant

710

1,228

2023 2050

$1.1

2050

McKinsey & Company projects

significant new nuclear

capacity demand to meet both

dispatchable power demand

and net-zero targets

Current market size implied to

be >700 IMSR Plants, growing

to >1,200 by 2050

Cumulative upfront and

average annual recurring

revenue to Terrestrial Energy

per IMSR Plant

Implied serviceable

addressable market (US

trillions)

Each IMSR Plant

(2x reactor Core-units)

able to generate 390 MWe

electricity (net)

OECD

413 =

$931 M / IMSR Plant3

× =

$0.7

136

2020

Global Nuclear Electricity Generation in OECD Markets Represents a Large

Additional Primary Market

GRAPHIC

Filename: tmb-20260721xex99d1g001.jpg · Sequence: 3

Binary file (112421 bytes)

Download tmb-20260721xex99d1g001.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g002.jpg · Sequence: 4

Binary file (443462 bytes)

Download tmb-20260721xex99d1g002.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g003.jpg · Sequence: 5

Binary file (221597 bytes)

Download tmb-20260721xex99d1g003.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g004.jpg · Sequence: 6

Binary file (257929 bytes)

Download tmb-20260721xex99d1g004.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g005.jpg · Sequence: 7

Binary file (329319 bytes)

Download tmb-20260721xex99d1g005.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g006.jpg · Sequence: 8

Binary file (250508 bytes)

Download tmb-20260721xex99d1g006.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g007.jpg · Sequence: 9

Binary file (339979 bytes)

Download tmb-20260721xex99d1g007.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g008.jpg · Sequence: 10

Binary file (275503 bytes)

Download tmb-20260721xex99d1g008.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g009.jpg · Sequence: 11

Binary file (255733 bytes)

Download tmb-20260721xex99d1g009.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g010.jpg · Sequence: 12

Binary file (217639 bytes)

Download tmb-20260721xex99d1g010.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g011.jpg · Sequence: 13

Binary file (229703 bytes)

Download tmb-20260721xex99d1g011.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g012.jpg · Sequence: 14

Binary file (255530 bytes)

Download tmb-20260721xex99d1g012.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g013.jpg · Sequence: 15

Binary file (205813 bytes)

Download tmb-20260721xex99d1g013.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g014.jpg · Sequence: 16

Binary file (226526 bytes)

Download tmb-20260721xex99d1g014.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g015.jpg · Sequence: 17

Binary file (190964 bytes)

Download tmb-20260721xex99d1g015.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g016.jpg · Sequence: 18

Binary file (252992 bytes)

Download tmb-20260721xex99d1g016.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g017.jpg · Sequence: 19

Binary file (301052 bytes)

Download tmb-20260721xex99d1g017.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g018.jpg · Sequence: 20

Binary file (198309 bytes)

Download tmb-20260721xex99d1g018.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g019.jpg · Sequence: 21

Binary file (139999 bytes)

Download tmb-20260721xex99d1g019.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g020.jpg · Sequence: 22

Binary file (229481 bytes)

Download tmb-20260721xex99d1g020.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g021.jpg · Sequence: 23

Binary file (244408 bytes)

Download tmb-20260721xex99d1g021.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g022.jpg · Sequence: 24

Binary file (173120 bytes)

Download tmb-20260721xex99d1g022.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g023.jpg · Sequence: 25

Binary file (307233 bytes)

Download tmb-20260721xex99d1g023.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g024.jpg · Sequence: 26

Binary file (191880 bytes)

Download tmb-20260721xex99d1g024.jpg

GRAPHIC

Filename: tmb-20260721xex99d1g025.jpg · Sequence: 27

Binary file (179825 bytes)

Download tmb-20260721xex99d1g025.jpg

XML — IDEA: XBRL DOCUMENT

XML

Filename: R1.htm · Sequence: 33

v3.26.1

Document and Entity Information

Jul. 21, 2026

Document Information [Line Items]

Document Type

8-K

Document Period End Date

Jul. 21, 2026

Entity Registrant Name

TERRESTRIAL ENERGY INC.

Entity Incorporation, State or Country Code

Entity File Number

001-42252

Entity Tax Identification Number

98-1785406

Entity Address, Address Line One

2730 W. Tyvola Road

Entity Address, Adress Line Two

Suite 100

Entity Address, City or Town

Charlotte

Entity Address State Or Province

Entity Address, Postal Zip Code

28217

City Area Code

646

Local Phone Number

687-8212

Written Communications

false

Soliciting Material

false

Pre-commencement Tender Offer

false

Pre-commencement Issuer Tender Offer

false

Entity Emerging Growth Company

true

Entity Ex Transition Period

false

Entity Central Index Key

0002019804

Amendment Flag

false

Common Stock, par value $0.0001 per share

Document Information [Line Items]

Title of 12(b) Security

Common Stock, par value $0.0001 per share

Trading Symbol

IMSR

Security Exchange Name

NASDAQ

Redeemable Warrants, each whole warrant exercisable for one Common Stock at a price of $11.50 per share

Document Information [Line Items]

Title of 12(b) Security

Redeemable Warrants, each whole warrant exercisable for one CommonStock at a price of $11.50 per share

Trading Symbol

IMSRW

Security Exchange Name

NASDAQ

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:

dei_DocumentInformationLineItems

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

Period Type:

duration

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

Period Type:

duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 2 such as Street or Suite number

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine2

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

Period Type:

duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if an emerging growth company has elected not to use the extended transition period for complying with any new or revised financial accounting standards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 7A

-Section B

-Subsection 2

+ Details

Name:

dei_EntityExTransitionPeriod

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

Period Type:

duration

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

Period Type:

duration

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

Period Type:

duration

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

dei_PreCommencementTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

+ Details

Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

Period Type:

duration

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

dei_

Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

dei_

Data Type:

dei:tradingSymbolItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

Name:

dei_WrittenCommunications

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Details

Name:

us-gaap_StatementClassOfStockAxis=imsr_CommonStockParValue0.0001PerShareMember

Namespace Prefix:

Data Type:

Balance Type:

Period Type:

- Details

Name:

us-gaap_StatementClassOfStockAxis=imsr_RedeemableWarrantsEachWholeWarrantExercisableForOneCommonStockAtPriceOf11.50PerShareMember

Namespace Prefix:

Data Type:

Balance Type:

Period Type: