Terrestrial Energy began trading under the Nasdaq ticker symbol “IMSR” following the completion of its merger with HCM II Acquisition Corp. The company secured more than $292 million in gross proceeds to accelerate its next phase of commercializing nuclear reactors. Its stock rose by 6.15% to $19.15 as of 3:23:12 PM EDT, signaling a strong market response.
Terrestrial Energy (IMSR)
Terrestrial Energy completed its business combination with HCM II Acquisition Corp on October 28, 2025. It now trades on Nasdaq under the new ticker “IMSR,” reflecting its renewed public market position. The capital raise includes approximately $50 million from new institutional investors via PIPE and around $242 million from HCM II’s trust.
The merger results in a strengthened capital structure and increased liquidity for scaling up operations. Redemption rates remained below 1%, confirming broad approval for the transaction. Terrestrial Energy can now accelerate its commercialization strategy for its advanced nuclear solutions.
Its Nasdaq debut marks a significant shift in the nuclear sector’s financial landscape. With fresh capital and public visibility, Terrestrial Energy aims to scale its technology platform. This step also enhances its partnerships and customer commitments across industrial energy applications.
Terrestrial Energy develops small modular nuclear reactors using its proprietary Integral Molten Salt Reactor (IMSR) technology. Each IMSR plant includes two reactors with a combined thermal capacity of 822 MWth, producing 390 MWe of electric power. The design emphasizes modular deployment, high thermal output, and cost-effective scalability.
IMSR plants aim to provide affordable, clean, and flexible power for both electricity grids and industrial sectors. The system runs on Standard-Assay Low Enriched Uranium fuel containing less than 5% uranium-235. This supports regulatory compliance and ensures compatibility with current nuclear infrastructure.
The technology uses a Generation IV reactor framework, improving both safety and capital efficiency. Its high-temperature heat output enables new applications beyond traditional nuclear electricity. These include data centers, hydrogen production, and large-scale manufacturing processes.
Terrestrial Energy has built its platform through extensive regulatory engagement and participation in pilot programs with the U.S. Department of Energy. Its experience supports transparent and scalable deployment pathways for its IMSR nuclear plants. The company also holds multiple national lab partnerships to drive development and testing.
Key collaborations include work with Texas A&M University, Siemens, Westinghouse, and Ameresco. These partnerships help streamline supply chains and validate technical assumptions across use cases. The company’s integration with DOE programs adds momentum toward licensing and commercialization.
These factors position Terrestrial Energy as a credible player in the clean energy transition. With a clear roadmap, financial backing, and operational partnerships, it now targets fleet-scale deployments. The Nasdaq listing marks a pivotal step in its long-term energy strategy.
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