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. 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.
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