Welcome to our dedicated page for Terrestrial Energy SEC filings (Ticker: IMSR), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Terrestrial Energy Inc. (NASDAQ: IMSR) is a developer of Generation IV nuclear plants using its proprietary Integral Molten Salt Reactor (IMSR) technology. As a Nasdaq-listed company that has completed a business combination with HCM II Acquisition Corp., Terrestrial Energy files reports and disclosure documents with the U.S. Securities and Exchange Commission (SEC). These filings provide details on the company’s corporate structure, the terms and effects of its business combination, capital raised, risk factors, and other regulatory information referenced in its public press releases.
For investors analyzing IMSR, key SEC filings typically include annual and quarterly reports, registration statements and documents related to its merger with HCM II Acquisition Corp. Company press releases refer to risk factors and uncertainties described in documents filed with the SEC, including sections titled “Risk Factors” and “Cautionary Note Regarding Forward-Looking Statements.” Reviewing these materials can help readers understand the risks associated with development, manufacturing and construction of IMSR plants, regulatory approvals, fuel supply considerations, competition from other advanced reactor developers and broader economic and regulatory conditions.
On this page, Stock Titan connects Terrestrial Energy’s SEC filings with AI-powered tools that summarize long-form documents and highlight key themes, such as the company’s IMSR plant design, its use of Standard-Assay Low Enriched Uranium (SALEU) fuel, participation in U.S. Department of Energy programs, and the financial and structural details of its business combination and Nasdaq listing. Users can also access information related to governance and ownership as disclosed in applicable SEC documents, along with any insider transaction filings such as Form 4 when available.
Filings are updated as new documents are posted to the SEC’s EDGAR system, giving investors a structured view of Terrestrial Energy’s regulatory record alongside AI-generated explanations that can make complex nuclear and capital markets disclosures easier to interpret.
Terrestrial Energy Inc. files its annual report describing its transition from SPAC HCM II Acquisition Corp. into a holding company focused on commercializing its Integral Molten Salt Reactor (IMSR) advanced nuclear plant through subsidiary Terrestrial Energy Development Inc.
The company targets first IMSR commercial operations around 2034, aiming to serve a serviceable addressable market it estimates at over $1.4 trillion in OECD countries, rising to $1.9 trillion by 2050. Its IMSR Plant is designed to supply 822 MW (net) thermal and 390 MW (net) electricity at 585°C with about 44% net efficiency, a 56‑year operating life, and seven‑year core replacement cycles.
Terrestrial Energy reports an accumulated deficit of $124.6 million as of December 31, 2025 and notes additional capital raises of $36.7 million since December 31, 2024 plus $292 million of gross proceeds from its business combination. It highlights regulatory progress, including completion of the Canadian Vendor Design Review with “no fundamental barriers to licensing” and ongoing U.S. NRC pre‑application work, as well as selection for a U.S. DOE advanced reactor pilot program and a pipeline of more than ten early‑stage IMSR projects.
Terrestrial Energy Inc. reported a larger net loss for 2025 while dramatically strengthening its balance sheet following a major capital raise and business combination. For the year ended December 31, 2025, the company posted a net loss of $28,016,641 versus $11,485,410 in 2024, with no revenue compared to $248,357 a year earlier, reflecting higher research and development and general and administrative spending.
Cash and cash equivalents rose to $97,164,391 from $3,021,795, and short-term investments reached $200,626,281, driven by financing activities including a completed business combination that raised approximately $292 million in gross proceeds. Total assets increased to $302,980,424, stockholders’ equity swung from a deficit of $(13,490,552) to positive equity of $295,406,242, and weighted-average basic and diluted loss per share was $(0.39) on 71.6 million shares. The company highlights regulatory, fuel supply and project development progress for its Integral Molten Salt Reactor and plans to advance clearly defined milestones into 2026.
Terrestrial Energy Inc. (IMSR) 10% owner Roberto Marco Sella has filed an amended Form 3 to update how his existing stakes are described, without reporting any new purchases or sales. The filing lists holdings of common stock and warrants as of October 29, 2025, including both direct and indirect positions.
Directly, he reports 180,316 shares of common stock and 539,117 warrants to purchase common stock. Indirectly, he reports 12,244,088 shares of common stock and multiple warrant positions held through joint ownership with his spouse, a 2012 family trust where he serves as trustee, and the LL Charitable Foundation where he is president. The amendment states it is made solely to correct footnote designations in the warrant table, indicating the change is administrative rather than economic.
Citadel affiliates and Kenneth Griffin report beneficial ownership in Terrestrial Energy Inc. They may be deemed to beneficially own a total of 2,303,796 common shares, representing 2.2% of the outstanding Shares as of December 15, 2025.
Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC each may be deemed to own 2,029,208 Shares, or 1.9% of the class. Citadel Securities LLC, Citadel Securities Group LP and Citadel Securities GP LLC each may be deemed to own 274,588 Shares, or 0.3% of the class.
The Reporting Persons state they share voting and dispositive power over these Shares and certify that the securities were not acquired and are not held for the purpose of changing or influencing control of Terrestrial Energy Inc.
Terrestrial Energy Inc. filed a current report to let investors know it has shared a new corporate update with shareholders. On January 29, 2026, the company issued a letter providing this update, which is attached to the filing as Exhibit 99.1 and incorporated by reference.
The report states that the shareholder letter and related information are being furnished under Regulation FD, meaning they are provided for fair disclosure but are not treated as filed for liability purposes under the Exchange Act or automatically included in other securities filings.
Terrestrial Energy Inc. received a Schedule 13G filing disclosing that investor Roberto Sella, together with the Roberto M. Sella 2012 Family Trust and LL Charitable Foundation, holds a significant passive stake in the company. The filing reports that Sella beneficially owns 15,378,689 shares of common stock, representing 14.34% of the class, including shares held directly, jointly with his spouse, and through warrants. The Trust holds 1,538,319 shares (1.44% of the class), and the Foundation holds 653,334 shares (0.62% of the class). These positions arose when the reporting persons received Terrestrial Energy Inc. securities at the closing of an October 29, 2025 business combination, and they certify that the holdings are not for the purpose of changing or influencing control.
Terrestrial Energy Inc. insider Sella Roberto Marco, a more than 10% owner, filed an initial statement of beneficial ownership as of 10/29/2025, reflecting equity received at the closing of a business combination between the current Terrestrial Energy entity and its predecessor.
The filing reports 180,316 shares of common stock held directly, plus additional common shares held indirectly through joint ownership with his spouse, the Roberto M. Sella 2012 Family Trust and the LL Charitable Foundation, where he may have voting and dispositive power but disclaims beneficial ownership except to the extent of his pecuniary interest. It also lists several series of warrants to purchase common stock, both directly and through these related entities, with exercise prices of $2.24 per share and expirations on 07/31/2028.