Welcome to our dedicated page for Terrestrial Energy SEC filings (Ticker: IMSRW), 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.
The Terrestrial Energy Inc. (IMSR, IMSRW) SEC filings page on Stock Titan is intended to provide access to the company’s regulatory disclosures once they are available in the U.S. Securities and Exchange Commission’s EDGAR system. Although no specific filings are listed in the data provided here, Terrestrial Energy’s public news releases reference risk factors and other information contained in documents it files from time to time with the SEC.
As a Nasdaq-listed developer of small modular nuclear plants using Generation IV Integral Molten Salt Reactor (IMSR) technology, Terrestrial Energy’s SEC filings are expected to include annual reports on Form 10‑K, quarterly reports on Form 10‑Q and current reports on Form 8‑K. These documents typically describe the company’s business, its IMSR plant design and capacity, its use of Standard-Assay Low Enriched Uranium (SALEU) fuel, participation in U.S. Department of Energy programs such as the Advanced Reactor Pilot Program and Fuel Line Pilot Program, and material agreements like its business combination with HCM II Acquisition Corp.
When available, Stock Titan’s platform can surface key elements from Terrestrial Energy’s filings, such as descriptions of Project TETRA, the IMSR fuel pilot plant agreement with Springfields Fuels Limited, and disclosed risk factors relating to regulatory approvals, construction and manufacturing risks, supply chain constraints and competition from other advanced reactor developers. Users interested in IMSR and IMSRW can use this page to review historical and ongoing SEC reports alongside AI‑generated summaries that explain complex sections, highlight changes from prior filings and help interpret disclosures about capital structure, warrant terms and other aspects of the company’s public listing.
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
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.