IMSR Q4 2025 Earnings Transcript

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Date

Thursday, May 14, 2026 at 8:30 a.m. ET

Call participants

• Chief Executive Officer — Simon Irish
• Chief Financial Officer — Brian Thrasher

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Takeaways

• Net Loss -- $28 million, an increase of $17 million due to higher R&D, regulatory, supply chain, and organizational costs during the year.
• R&D Expenses -- $10 million, up $5 million, reflecting expanded materials testing and graphite qualification work.
• General and administrative expenses -- $14 million, $10 million higher, mainly from personnel growth, infrastructure, and professional services expansion, excluding $22 million in business combination costs booked as additional paid-in capital.
• Legal, accounting, and professional fees -- $5 million, an increase of $4 million, not including $22 million in transaction-related charges.
• Stock-based compensation -- $3 million, up $2 million, driven by management expansion efforts.
• Interest expense (net) -- $3 million, up $2 million, with interest expense rising to $4 million from $1 million, partly offset by $1 million interest income.
• Year-end cash and short-term investments -- $298 million, incorporating business combination proceeds, PIPE financing, earlier funding rounds, and warrant exercises.
• Outstanding share count -- 105.8 million shares, comprising 81.8 million common shares and 24 million exchangeable shares convertible 1-for-1 at any time.
• Business combination proceeds -- Over $292 million gross proceeds secured through trust redemptions of less than 1% and a $50 million PIPE investment.
• DOE support -- Two OTA awards from Department of Energy programs back key pilot project acceleration (Project TETRA and TEFLA fuel line assembly).
• Regulatory milestone -- NRC completed and accepted the Topical Report on IMSR Principal Design Criteria, advancing license submission readiness.
• Texas A&M commercial project -- Company selected to site a full-scale IMSR plant at RELLIS campus, targeting ERCOT market.
• 2026 outlook -- Plans to announce further Texas A&M agreements, disclose 1 to 3 new commercial project details, submit at least 3 additional NRC Topical Reports, and report site selections for TETRA and TEFLA pilot projects.
• Supply chain expansion -- New and expanded contracts with Westinghouse, Siemens Energy, BWXT, and others to support fuel and reactor component development.
• Materials testing -- Announced graphite irradiation testing entered final phase at NRG PALLAS' High Flux Reactor in the Netherlands.

Summary

Terrestrial Energy (NASDAQ:IMSR) completed its transition to public markets with a major capital infusion, positioning the company to accelerate both engineering and regulatory milestones in advanced nuclear deployment. Strategic DOE contract awards and key regulatory progress were explicitly cited as critical to upcoming project launches, while management confirmed strong cash reserves support near-term execution. Expanded commercial partnerships and new project siting initiatives aim to secure early-mover advantage across industrial and data center markets, reflecting heightened demand from reshoring and policy-driven energy security priorities.

• The Texas A&M initiative marks the company's first full-scale deployment prospect anchored within the ERCOT grid, supported by a competitive selection process involving sector-wide review.
• Recent OTA awards from the Department of Energy specifically target acceleration of pilot test reactor and commercial fuel supply development, establishing a federally recognized pathway to commercialization.
• Management signaled a shift toward multi-project portfolio execution in 2026, identifying forthcoming disclosure of between 1 and 3 additional commercial IMSR deployments and accelerated NRC licensing efforts as "planned steps" in its strategic framework.
• Expansion of supplier contracts, particularly with Westinghouse, reinforces supply chain readiness and sector positioning as market momentum for next-generation nuclear escalates.

Industry glossary

• IMSR: Integral Molten Salt Reactor, Terrestrial Energy's proprietary advanced nuclear reactor technology designed for modular, low-carbon energy and industrial heat supply.
• PIPE: Private Investment in Public Equity, a transaction where investors purchase shares directly from the company concurrent with its public listing.
• OTA: Other Transaction Authority, a contracting tool used by the U.S. Department of Energy to engage in research and development projects outside standard federal acquisition regulations.
• Topical report: A detailed technical document submitted to nuclear regulators covering specific design or safety elements of a nuclear plant, which supports licensing applications.
• ERCOT: Electric Reliability Council of Texas, an independent system operator managing the electricity grid for the majority of Texas.
• TEFLA: Terrestrial Energy Fuel Line Assembly project, a pilot-scale initiative for IMSR fuel production processes.
• TETRA: Terrestrial Energy Test Reactor Assembly project, focused on data collection and demonstrating technical requirements for regulatory approval.
• HALEU: High-Assay Low-Enriched Uranium, a category of enriched uranium (15%-20%) required by some advanced reactor designs but explicitly avoided in Terrestrial Energy's design.

Full Conference Call Transcript

Simon Irish: Good morning, everyone, and thank you for joining us today. It's a pleasure to welcome you to Terrestrial Energy's first earnings call as a publicly traded company. 2025 was an important year for the company. We made significant progress across the 3 key elements of business plan execution. We delivered important regulatory developments, secured federal support for swift licensing and operation of reactor and fuel supply pilot projects. We announced expansion of supply chain activities, progress with commercial deployments, and we strengthened our balance sheet through our business combination with HCM II. Before discussing developments in more detail, I'd like to briefly step back and frame the important context in which we're now operating.

For industrial, innovation requires market context and for innovation -- for nuclear innovation, there is no more powerful context to what we see today and stretching far ahead. Referring now to Slide 3 of the slide deck posted to our website that accompanies today's call. Global energy markets have clearly entered a period of generational and transformative change. Electricity demand is accelerating at a pace not seen in decades, driven by demand growth from multiple sources, energy-intensive industrial innovations, artificial intelligence infrastructure, automation and electrification and the reshoring of manufacturing capacity. Furthermore, energy policy today clearly prioritizes national energy security, grid reliability and affordability.

Energy security has become a dominant theme across many advanced economies, a shift that accelerated with the start of the war in Ukraine and its associated impact on European natural gas supplies and has moved to a new level today with recent insecurity of Gulf-based LNG and oil supplies. It is now clear that only nuclear energy has the potential to meet these huge demand deficiencies and policy objectives for secure, clean, reliable energy supply. We see these powerful fundamentals driving nuclear energy demand to continue to strengthen, and they create today's extraordinary context for nuclear innovation that is without parallel.

Contemplating this opportunity, one quickly realizes there are many methods to supply nuclear energy from different sized plants ranging from the tiny to the enormous and a wide range of fission reactor technologies that cover the conventional -- the long conventional fission technologies of light and heavy water reactors to the generation class of advanced reactor technologies of the future to which our technology belongs. Here lies the secular opportunity today for the innovator.

If nuclear energy supply is to meet these extraordinary demand expectations, it supply must be from nuclear plants, operating with different commercial profiles, ones that are smaller and more affordable to build, ones that are much, much more capital efficient for low-cost energy supply, and ones that are modular for quick construction and deployment at scale. This next generation of nuclear plants must be more flexible in operation and capable of providing heat for industry as well as electric power. They must be easier to site near point of demand, close to data center, chemical or petrochemical plant. Their colocation capacity delivers a new energy supply paradigm.

Hundreds of megawatts of clean firm energy from a small parcel of land located close to demand and free from pipeline and transmission constraints, only innovation to deliver small and modular nuclear plants operating with next generation of nuclear technology has the potential to deliver these requirements. Turning to Slide 4. Terrestrial Energy was founded over 13 years ago, precisely with this paradigm in mind. We have been diligently moving forward with development of our IMSR plant design, anticipating the arrival of today's extraordinary market and policy circumstances. With this clear innovation focus, our IMSR plant is now heavily differentiated from other smaller modular nuclear plants in the advanced reactor sector in important, competitive and compelling ways.

I will discuss some of these differentiators now. Turning to Slides 5 and 6. First, affordability and capital efficiency. The IMSR plant is smaller, 1/6 the size of conventional nuclear plant, modular in design, and it captures the fundamental and deeply compelling techno-economic benefits of molten salt reactor technology. IMSR plant generates power from steam turbines operating with a near 50% greater efficiency than those driven by light-water reactor technology. Its nuclear systems operate at low pressure and with high inherent safety, again, powerful economic virtues that reduce costs further as well as virtues that secure strong social license for deployment. We believe that competitive affordability will be a primary driver of success. Second, flexibility in operations.

The IMSR plant is capable of high-temperature thermal energy supply for industrial process heat applications and can strongly load follow. Its output can be customized to a required precise mix of heat and power, and it can be integrated with other energy supply systems, including natural gas for customized resilience and speed to first commercial operations. We believe that this flexibility in operations contributes to an opportunity for a service addressable market for our company that we estimate to exceed $1.4 trillion. Third, scalability for fast fleet deployment.

As supply chain factors heavily determine speed to fleet to fleet scale, our supply chain objective has been to source to the greatest extent possible, material and components available from today's nuclear supply chain. This strategy has delivered important competitive and strategic advantages, particularly with steam turbine and fuel supply. While some Generation IV nuclear plants showed some of the characteristics required for next-generation nuclear energy supply, only the IMSR plant uses standard nuclear fuel, uranium enriched to less than 5%. Ten years ago, we strategically chose to avoid HALEU fuel use, that is uranium enriched to between 15% and 20%, the bracket required by other Generation IV reactors in our sector.

In today's enrichment constrained environment, this decision has removed from our deployment plans the considerable challenges and uncertainty of uranium fuel supply at commercial scale. In doing so, this decision has improved our market position, reduced regulatory complexity and cost the first plant as well as for fleet. We believe our supply chain strategy is delivering sector competitive advantages to fleet fast deployment at scale. Molten salt reactor technology is not new. It was first demonstrated over 6 decades ago and most recently in 2023, when China began operating its first molten salt reactor based on the technology demonstrated at Oak Ridge National Lab in Tennessee.

The technology's long history of research and development yields a considerable understanding of performance and operation. Our strategic design objective was to use this existing and extensive body of knowledge to create the strong technical foundation of the IMSR plant design that exists today. Let me spend a minute talking about regulation. A core objective of Terrestrial Energy since inception has been to retire project risk through early and focused engagement with world-leading nuclear regulators. We were the North American sector trailblazer when in 2016, we applied the Canadian Nuclear Safety Commission to undertake its formal programmatic vendor design review of our IMSR plant design.

In 2023, the Canadian Nuclear Safety Commission completed that formal review and concluded publicly that there were no fundamental barriers to licensing the IMSR plant design for commercial use. The work completed in Canada has matured our safety case. It bounds regulatory uncertainty and strengthens our regulatory engagement with the NRC in the United States, which started in 2017. Our business strategy is to deploy IMSR plants with competitive scale and speed and in a capital-efficient manner. To achieve this, Terrestrial Energy invites others to build, own and operate IMSR plant as is industry's convention today.

We will, however, remain the key project partner supporting project licensing and plant construction with revenue-generative engineering services and working with established engineering, procurement and construction partners to deliver commissioned and operating plant. We will also provide IMSR core units, fuel, fueling services and full life cycle operational support. This approach leverages the capability of experienced industrial partners, providing speed to deployment at fleet scale. It also allows us to focus on our core capabilities and primary business objectives. With this business strategy in mind, I'd like to present the framework to assess progress. It has 3 pillars. The first drives IMSR engineering and regulatory developments, including our key project engagements with the Department of Energy.

The second drives supply chain developments. And the third drives IMSR plant projects advancing to deployment. I'd now like to review 2025 developments, demonstrating our progress across these 3 pillars. Please refer to Slide 7. In 2025, we announced the NRC's completion and acceptance of our Topical Report on the IMSR Principal Design Criteria. This was a foundational ruling, representing an important step forward to IMSR operating license submission and demonstrating progress with our pre-application engagement with the regulator. Our regulatory program operates in parallel with our engineering and testing programs. In 2025, we received welcome support from 2 new strategic programs administered by the Department of Energy.

These were established following presidential executive orders in May 2025 to accelerate advanced reactor development. We received 2 OTA awards, one from each program. The first from the Department of Energy's Advanced Reactor Pilot Program. This supports quick execution of Project TETRA, the Terrestrial Energy Test Reactor Assembly project, which assists with data collection required for future IMSR license application. The second was from the Department of Energy's Fuel Line Pilot Program, which supports our schedule for completion of our Fuel Line Assembly project, TEFLA, which is a pilot scale fuel production process, the antecedent to our commercial plant for IMSR plant fuel supply.

On further supply chain matters, we continue to build on previously established relationships with leading industrial nuclear suppliers such as Westinghouse, Siemens Energy, BWXT as well as other experienced component manufacturers. These supplier relationships support fabrication of reactor components, development of fuel supply infrastructure and long-term project capabilities. In 2025, we announced further contracts with Westinghouse to support our IMSR fuel supply program. In the past year, we advanced important materials testing, selection and qualification work. We announced our graphite irradiation testing had entered its concluding phase at the NRG PALLAS' High Flux Reactor in the Netherlands. This is one of the West's most powerful test reactors.

We would like to draw attention to the importance of such in-core testing for Generation IV reactor materials. These are activities essential for reactor materials qualification, supplier selection and licensing readiness for Generation IV reactor technology. Now turning to IMSR plant project developments. Early in 2025, Texas A&M University, supported by expertise in its nuclear engineering faculty, announced its selection of Terrestrial Energy to site a full-scale commercial IMSR plant at its RELLIS campus, following a competitive sector-wide evaluation process. This selection positions an IMSR plant on ERCOT, one of the fastest-growing electricity markets in North America and places the project in a leading engineering research and workforce development ecosystem.

In 2025, we announced collaboration with Ameresco to partner with IMSR plant site identification and project development. Ameresco brings deep project development expertise and extensive experience with federal energy programs. This relationship expands our capacity to identify IMSR plant project opportunities across multiple industrial and data center markets and to develop them. As we move into 2026, our focus is again on disciplined execution against a series of clearly defined and planned steps, each advancing across the 3-pillar framework discussed earlier. With this framework in mind, I would like to provide guidance on further developments in 2026. Turning to Slide 8. We expect to announce the following developments in 2026.

First, announce further agreements with Texas A&M for the deployment of an IMSR plant at RELLIS and for testing and development of key IMSR components and processes. These agreements will support the siting and development of the proposed IMSR plant. Second, and following the announcement of the RELLIS IMSR plant project in 2025, we expect to disclose details of between 1 and 3 additional commercial projects to deploy IMSR plants. Third, we expect to submit to the NRC for review at least 3 additional Topical Reports covering key and consequential areas to increase readiness for NRC license submissions to construct and operate IMSR plant.

Finally, following the 2 Department of Energy OTA awards in 2025, we expect to provide project development details disclosing sites for both the TETRA and TEFLA projects. We expect to identify key engineering partners and organizations supporting regulatory readiness for these important projects. In closing, 2025 was a transformational year for the company. We were successful with our strategy to respond swiftly to the remarkable and generational change in demand for nuclear energy supply. We strengthened our capital position, advanced regulatory readiness and secured support from the DOE's federal programs in key areas. We advanced commercial and supply chain partnerships always aiming for fleet scale solutions and initiated projects and relationships to deploy IMSR plants.

Terrestrial Energy's founding belief was that nuclear technology must evolve to meet the remarkable energy market requirements of this modern era. As a private sector innovator, we declared over a decade ago that the ruling objective for nuclear innovation is affordability, cost competitiveness and speed to market at scale. Design and technology decisions have profound and fundamental consequence. On returning from CERAWeek and reflecting on this objective, as we repeatedly do, we remain as convinced of this objective as on the day we founded the company. And over the last decade, we have consistently programmatically and diligently advanced our IMSR plant design.

Today, our long commitment and conviction in this ruling objective of nuclear innovation positions the IMSR plant as powerfully and competitively differentiated in a nuclear tech sector pursuing a $1 trillion market opportunity. We are moving forward from this position, looking past the deployment of a single IMSR plant to a fleet of IMSR plants in the 2030s and the establishment of a standardized and scalable platform for IMSR plant delivery across multiple industrial and grid applications and across international markets. With that, I will now turn the call over to Brian Thrasher, our Chief Financial Officer, to review the financial results in more detail.

Brian Thrasher: Thank you, Simon, and good morning, everyone. I will briefly review our financial results, liquidity and capital position for the year, and then we will open the call for questions. Let me begin though with the transaction that positioned Terrestrial Energy to enter this next phase of development. On October 28, 2025, Terrestrial Energy completed its business combination with HCM II Acquisition Corp. and began trading on NASDAQ under the ticker IMSR on October 29, 2025. The transaction resulted in trust redemptions of less than 1% and combined with the $50 million PIPE, secured more than $292 million in gross proceeds.

We believe this outcome reflects strong support from investors for both our small and modular nuclear plant design as well as our business strategy in the context of the market opportunity today for nuclear innovation. Following the listing, we also announced developments with our fuel services agreement with Westinghouse, strengthening our supply chain readiness for IMSR plant commercial operation. In addition, we enhanced our senior leadership team during the fourth quarter to support U.S. commercialization efforts and deepen engagement with federal stakeholders. Turning now to our financial results as summarized on Slide 9. Terrestrial Energy reported a net loss of $28 million for 2025, an increase of $17 million on the prior year.

This increase reflects growing expenses from our IMSR engineering program with its component testing, regulatory activities from our TETRA and TEFLA projects with the DOE from supply chain development as well as from organizational expansion as we resource for public company readiness for key technical capabilities and for projects. Research and development expenses, those expenses incurred for design and engineering of the IMSR plant increased to $10 million in 2025, an increase of $5 million from the prior year as we expanded materials testing and progressed graphite qualification work.

General and administrative expenses increased to $14 million in 2025, an increase of $10 million from the prior year, primarily reflecting expansion in personnel, corporate infrastructure and professional services to accelerate our commercialization activities and support public company readiness. Within general and administrative expenses, legal, accounting and other professional fees increased to $5 million in 2025, an increase of $4 million over the prior year and excluding $22 million of transaction-related costs associated with the business combination, which are presented as an increase to additional paid-in capital.

Also, personnel-related expenses increased as we move forward with our commercial development, grew our staff to support IMSR engineering, finance, supply chain development, management of IMSR plant commercial projects and public company reporting requirements. Additionally, stock-based compensation increased to approximately $3 million, an increase of $2 million over the prior year as management capabilities expanded during the year. Finally, we incurred approximately $1 million in additional costs in 2025 to advance public company readiness and scaling of our operations. These included directors and officers insurance, investor engagement activities, conference participation, travel and expanded software and operational systems.

Interest expense, net of interest income of $3 million in 2025 increased by $2 million from the prior year, reflecting increased debt balances, partially offset by higher interest income. More specifically, interest expense of $4 million in 2025 compared to $1 million in 2024 is attributable to larger average debt balances in 2025, combined with the amortization of the debt discount on the legacy Terrestrial Energy convertible notes. The company earned $1 million of interest income in 2025 on the cash balance received from the closing of the business combination. Turning now to liquidity. At year-end, we held approximately $298 million in cash and short-term investments.

This balance reflects the proceeds from the business combination with a $50 million PIPE investment completed in October, two financing rounds completed earlier in the year and the cash exercise of legacy Terrestrial Energy private warrants. This capital position provides the financial resources for a period of strong business growth and to deliver consequential progress with important milestones. These include milestones from progress with our IMSR engineering program and its regulatory and R&D elements that include the TETRA and TEFLA R&D projects with the DOE, from supply chain development and from progress with IMSR plant commercial projects.

At year-end, summarized on Slide 10, the company's issued and outstanding share count was 105.8 million shares consisting of 81.8 million common shares outstanding and 24 million exchangeable shares outstanding. The exchangeable shares are exchangeable into common shares on a one-for-one basis at any time at the election of the holders. That concludes our prepared remarks. Operator, please open the line for questions.

Operator: [Operator Instructions] our first question is from Jeff Grampp with Northland Capital Markets.

Jeffrey Grampp: I was curious to start on the '26 kind of expectation milestone slide, you guys talked about announcing 1 to 3 additional commercial projects. I know you can't provide too many details on kind of future announcements, but to the extent you can provide a little more detail, do you expect those to be more kind of MOU, LOI type announcements, definitive deployments at identified sites or something else? Just, I guess, trying to level set, I guess, the maturity of some of the conversations you're having with prospective customers.

Simon Irish: Well, Jeff, yes, we will reserve detail to the moment in which we disclose these developments, but sort of perhaps more generally, for an IMSR project is first defined by the location. It's got a ZIP code. And it's also defined by a process, which starts with the declared intention of the parties involved to proceed with that process ultimately to the commissioning of an IMSR power plant. So maybe I'll just leave it there in terms of providing additional detail on what that means.

Jeffrey Grampp: Understood. Appreciate that. My follow-up, there was a recent announcement from the NRC regarding Part 53 licensing as kind of an emerging pathway, which I think would have some applicability to Terrestrial's design. Is that something you guys are considering pursuing? And if so, what kind of benefit could you see to that having to your commercialization pathway?

Simon Irish: Well, it's certainly an option for us to consider in terms of what is the most efficient pathway to commercializing to life getting to operation of first plant. We are very familiar with that type of the Part 52 framework. It's graduated, it's risk informed, it's principles based, all the elements of the Canadian process, by the way. The Canadian process has been defined for a long time as graduated risk informed principles based. So it's certainly an option for us and many others in the industry. Our central case at this point in time for those first couple of plants is going to be a Part 50 strategy.

So the 2 step, the construction permit moving on to the operating license.

Operator: [Operator Instructions] With no further questions, I would like to hand the conference back over to Simon for closing remarks.

Simon Irish: I'd like to thank everyone for joining us today on our first earnings call as a public company. Thank you for attention, and we look forward to providing you with further updates in the future. Thank you.

Operator: Thank you. This will conclude today's conference. You may disconnect at this time, and thank you for your participation.

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