SCHEDULE: Insider Boosts Stake in Terrestrial Energy to 14.34%

Roberto Marco Sella and affiliated entities have reported a combined beneficial ownership of 14.34% in Terrestrial Energy Inc. following a recent business combination.

Summary

• Roberto Marco Sella, along with the Roberto M. Sella 2012 Family Trust and LL Charitable Foundation, collectively reported beneficial ownership of Terrestrial Energy Inc.
• The total aggregate amount beneficially owned by Roberto Marco Sella is 15,378,689 shares, representing 14.34% of the company's common stock.
• The Roberto M. Sella 2012 Family Trust beneficially owns 1,538,319 shares, or 1.44% of the class.
• The LL Charitable Foundation beneficially owns 653,334 shares, or 0.62% of the class.
• These percentages are calculated based on 81,771,423 shares outstanding as of December 15, 2025, and 24,011,029 shares issuable upon conversion of Terrestrial Energy Canada (Exchange) Inc. shares, totaling 105,782,452 shares.
• The reported ownership includes directly held shares, shares held jointly with Mr. Sella's spouse, and shares issuable upon the exercise of warrants with an exercise price of $2.24 per share.
• The filing follows a business combination between Old Terrestrial and the Issuer, which was consummated on October 29, 2025.

Sentiment

Score: 7

Explanation: The filing indicates a substantial beneficial ownership by a key individual and related entities, which typically signals strong insider confidence in the company's long-term prospects.

Positives

• Significant insider ownership by Roberto Marco Sella and affiliated entities, totaling 14.34%, indicates strong confidence in the company's future.
• The aggregation of shares includes warrants, suggesting a long-term commitment to the company's success.

Future Outlook

This filing does not contain any forward-looking statements or guidance regarding the company's future outlook.

Industry Context

This Schedule 13G filing is a standard regulatory disclosure of significant beneficial ownership. It does not provide specific industry context or competitive analysis, but a substantial insider stake can be viewed positively within any industry as a sign of alignment between management/insiders and shareholder interests.

Related Party Transactions

• The filing details beneficial ownership by Roberto Marco Sella, the Roberto M. Sella 2012 Family Trust, and the LL Charitable Foundation. Mr. Sella is identified as a principal owner and controlling person of both the Trust and the Foundation, indicating a related party relationship in their shareholdings.

Stakeholder Impact

• Shareholders may view the significant insider ownership as a positive signal, suggesting alignment of interests between a key individual and the company's performance.
• The disclosure provides transparency regarding the ownership structure, which is beneficial for all stakeholders.

Key Dates

Recommendation

The significant beneficial ownership reported by Roberto Marco Sella and affiliated entities, totaling 14.34%, suggests strong insider confidence in Terrestrial Energy Inc. While this filing does not provide operational or financial performance data, a substantial insider stake is generally a positive indicator for long-term prospects. Investors may consider holding their positions, as this level of insider commitment often aligns management interests with shareholder value creation.

Keywords

Terrestrial Energy Inc., Roberto Marco Sella, Schedule 13G, Beneficial Ownership, Insider Ownership, Common Stock, Warrants, Business Combination, SEC Filing