For the quarterly period ended June 30, 2026 TERRESTRIAL ENERGYINC. (Exact name of registrant as specified in its charter) 98-1785406(I.R.S. EmployerIdentification Number) Delaware(State or otherjurisdiction ofincorporation or organization) 2730 W. Tyvola RoadSuite100Charlotte, NC 28217(Address of Principal Executive Offices)(646) 687-8212(Registrant’s telephone number) Securities registered pursuant to Section12(b)of the Act: Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d)of the SecuritiesExchange Act of 1934 during the preceding 12months (or for such shorter period that the registrant was required to file such reports),and (2)has been subject to such filing requirements for the past 90days.Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submittedpursuant to Rule405 of RegulationS-T (§232.405 of this chapter) during the preceding 12months (or for such shorter period that theregistrant was required to submit such files).Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smallerreporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smallerreporting company,” and “emerging growth company” in Rule12b-2 of the Exchange Act. Emerging growth company☒ Smaller reporting company If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying with any new or revised financial accounting standards provided pursuant to Section13(a)of the Exchange Act.☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule12b-2 of the Exchange Act).Yes☐No☒As of August 11, 2026, there were 105,935,254 of the registrant’s ordinary shares outstanding. TABLE OF CONTENTS Cautionary Note Regarding Forward-Looking Statements Part IFinancial Information4Item 1.Financial Statements (Unaudited)4Condensed Consolidated Balance Sheets as of June 30, 2026 and December 31, 2025(Unaudited)4Condensed Consolidated Statements of Operations and Comprehensive Loss for thethree and six months ended June 30, 2026 and 2025 (Unaudited)5Condensed Consolidated Statements of Stockholders’ Equity (Deficit) for the three andsix months ended June 30, 2026 and 2025 (Unaudited)6Condensed Consolidated Statements of Cash Flows for the six months ended June 30,2026 and 2025 (Unaudited)7Notes to Condensed Consolidated Financial Statements (Unaudited)8Item 2.Management’s Discussion and Analysis of Financial Condition and Results ofOperations20Item 3.Quantitative and Qualitative Disclosures about Market Risk25Item 4.Controls and Procedures25Part IIOther Information27Item 1.Legal Proceedings27Item 1A.Risk Factors27Item 2.Unregistered Sales of Equity Securities and Use of Proceeds27Item 3.Defaults Upon Senior Securities27Item 4.Mine Safety Disclosures27Item 5.Other Information27Item 6.Exhibits27ExhibitIndex28Signatures29 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This Quarterly Report on Form 10-Q (this “Quarterly Report”) of Terrestrial Energy Inc. (“TerrestrialEnergy,” the “Company,” “we,” “our,” and “us”) contains certain forward-looking statements within themeaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21Eof the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Forward-looking statementsrelate to future events or future performance and include, without limitation, statements concerning ourbusiness strategy, future revenues, market growth, capital requirements, product introductions, expansionplans and the adequacy of our funding. Other statements contained in this Quarterly Report that are nothistorical facts are also forward-looking statements. We have tried, wherever possible, to identify forward-looking statements by terminology such as “may,” “will,” “could,” “should,” “expects,” “anticipates,”“intends,”“plans,”“believes,”“seeks,”“estimates,”“continue,”“might,”“possible,”“potential,”“predict,” “project,” “goal,” “would,” “commit,” and other stylistic variants denoting forward-lookingstatements. We caution investors that any forward-looking statements presented in this Quarterly Report, or that wemay make orally or in writing from time to time, are based on information currently available, as well asour beliefs and assumptions. The actual outcome related to forward-looking statements will be affected byknown and unknown risks, trends, uncertainties, and factors that are beyond our control or ability topredict. Although we believe that our assumptions are reasonable, they are not guarantees of futureperformance, and some will inevitably prove to be incorrect. As a result, our actual future results can beexpected to differ from our expectations, and those differences may be material