Terrestrial Energy Inc. /DE/ 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended September 30, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-42252 TERRESTRIAL ENERGY INC. (Exact Name of Registrant as Specified in Its Charter) Delaware 98-1785406 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) 2730 W. Tyvola Road , Suite 100 Charlotte , NC 28217 (Address of principal executive offices) (Zip Code) (646) 687-8212 (Issuer’s telephone number) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, par value $0.0001 per share IMSR The Nasdaq Stock Market LLC Redeemable Warrants, each whole warrant exercisable for one Common Stock at a price of $11.50 per share IMSRW The Nasdaq Stock Market LLC Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (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 90 days. Yes ☐ No ☒ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant 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 smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. Large accelerated filer ☐ Accelerated filer ☐ Non-accelerated filer ☒ Smaller reporting company ☒ Emerging growth company ☒ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☒ No ☐ As of November 14, 2025, there were 22,992,610 Class A ordinary shares, $0.0001 par value and 5,750,000 Class B ordinary shares, $0.0001 par value, issued and outstanding. HCM II ACQUISITION CORP. FORM 10-Q FOR THE QUARTER ENDED SEPTEMBER 30, 2025 TABLE OF CONTENTS Page Part I. Financial Information 1 Item 1. Interim Financial Statements 1 Condensed Consolidated Balance Sheets as of September 30, 2025 (Unaudited) and December 31, 2024 1 Condensed Consolidated Statements of Operations for the Three and Nine Months Ended September 30, 2025, for the Three Months Ended September 30, 2024 and for the Period from April 4, 2024 (Inception) Through September 30, 2024 (Unaudited) 2 Condensed Consolidated Statements of Changes in Shareholders’ Deficit for the Three and Nine Months Ended September 30, 2025, for the Three Months Ended September 30, 2024 and for the Period from April 4, 2024 (Inception) Through September 30, 2024 (Unaudited) 3 Condensed Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2025 and for the Period from April 4, 2024 (Inception) Through September 30, 2024 (Unaudited) 4 Notes to Condensed Consolidated Financial Statements (Unaudited) 5 Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations 22 Item 3. Quantitative and Qualitative Disclosures About Market Risk 27 Item 4. Controls and Procedures 27 Part II. Other Information 28 Item 1. Legal Proceedings 28 Item 1A. Risk Factors 28 Item 2. Unregistered Sales of Equity Securities and Use of Proceeds 28 Item 3. Defaults Upon Senior Securities 28 Item 4. Mine Safety Disclosures 28 Item 5. Other Information 28 Item 6. Exhibits 29 Part III. Signatures 31 i PART I - FINANCIAL INFORMATION Item 1. Interim Financial Statements. HCM II ACQUISITION CORP. CONDENSED CONSOLIDATED BALANCE SHEETS September 30, 2025 December 31, 2024 (Unaudited) Assets Current assets Cash $ 350,389 $ 668,089 Other receivable — 41,250 Due from Sponsor 4,466 4,466 Short-term prepaid insurance 75,208 90,250 Prepaid expenses 31,594 16,112 Total current assets 461,657 820,167 Long-term prepaid insurance — 52,646 Marketable securities held in Trust Account 242,642,972 235,193,585 Total Assets $ 243,104,629 $ 236,066,398 Liabilities and Shareholders’ Deficit Current Liabilities Accrued expenses $ 3,539,988 $ 458,624 Advance from related party 338,002 — Promissory note - related party 400,000 — Total current liabilities 4,277,990 458,624 Forward purchase agreement liability — — Deferred underwriting fee 10,720,000 10,720,000 Total Liabilities 14,997,990 11,178,624 Commitments and Contingencies (Note 6) Class A ordinary shares subject to possible redemption, 23,000,000 shares at redemption value of $ 10.55 and $ 10.23 per share at September 30, 2025 and December 31, 2024, respectively 242,642,972 235,193,585 Shareholders’ Deficit Preference shares, $ 0.0001 par value; 1,000,000 shares authorized; none issued or outstanding at September 30, 2025 and December 31, 2024 — — Class A ordinary shares, $ 0.0001 par value; 200,000,000 shares authorized; none issued or outstanding (excluding 23,000,000 and 23,000,000 shares subject to possible redemption) at September 30, 2025 and December 31, 2024, respectively — — Class B ordinary shares, $ 0.0001 par value; 20,000,000 shares authorized; 5,750,000 and 5,750,000 shares issued and outstanding at September 30, 2025 and December 31, 2024, respectively 575 575 Additional paid-in capital — — Accumulated deficit ( 14,536,908 ) ( 10,306,386 ) Total Shareholders’ Deficit ( 14,536,333 ) ( 10,305,811 ) Total Liabilities and Shareholders’ Deficit $ 243,104,629 $ 236,066,398 The accompanying notes are an integral part of the unaudited condensed consolidated financial statements. 2 HCM II ACQUISITION CORP. CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) For the Three Months Ended September 30, For the Nine Months Ended September 30, For the Period from April 4, 2024 (Inception) Through September 30, 2025 2024 2025 2024 General and administrative costs $ 1,638,082 $ 278,494 $ 4,230,522 $ 331,157 Loss from operations ( 1,638,082 ) ( 278,494 ) ( 4,230,522 ) ( 331,157 ) Other income (expense): Interest earned on marketable securities held in Trust Account 2,508,797 1,349,715 7,449,387 1,349,715 Initial loss on forward purchase agreement liability — — ( 893,425 ) — Change in fair value of forward purchase agreement liability 1,057,124 — 893,425 — Total other income, net 3,565,921 1,349,715 7,449,387 1,349,715 Net income $ 1,927,839 $ 1,071,221 $ 3,218,865 $ 1,018,558 Weighted average shares outstanding of Class A ordinary shares 23,000,000 10,615,385 23,000,000 5,396,648 Basic net income per ordinary share, Class A ordinary shares $ 0.07 $ 0.07 $ 0.11 $ 0.09 Weighted average shares outstanding of Class A ordinary shares 23,000,000 10,615,385 23,000,000 5,396,648 Diluted net income per ordinary share, Class A ordinary shares $ 0.07 $ 0.07 $ 0.11 $ 0.09 Weighted average shares outstanding, Class B ordinary shares (1) 5,750,000 5,750,000 5,750,000 5,621,508 Basic net income per ordinary share, Class B ordinary shares $ 0.07 $ 0.07 $ 0.11 $ 0.09 Weighted average shares outstanding, Class B ordinary shares 5,750,000 5,750,000 5,750,000 5,621,508 Diluted net income per ordinary share, Class B ordinary shares $ 0.07 $ 0.07 $ 0.11 $ 0.09 (1) Excludes up to 750,000 Class B ordinary shares subject to forfeiture if the over-allotment option is not exercised in full or in part by the underwriters (Note 6). On August 19, 2024, the Company consummated its IPO and sold 23,000,000 Units, including 3,000,000 Units sold pursuant to the full exercise of the underwriters’ option to purchase additional units to cover the over-allotment, hence the 750,000 shares of Class B ordinary shares were no longer subject to forfeiture. The accompanying notes are an integral part of the unaudited condensed consolidated financial statements. 3 HCM II ACQUISITION CORP. CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ DEFICIT (UNAUDITED) FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2025 Class A Ordinary Shares Class B Ordinary Shares Additional Paid-in Accumulated Total Shareholders’ Shares Amount Shares Amount Capital Deficit Deficit Balance – January 1, 2025 — $ — 5,750,000 $ 575 $ — $ ( 10,306,386 ) $ ( 10,305,811 ) Accretion for Class A ordinary shares to redemption amount — — — — — ( 2,462,864 ) ( 2,462,864 ) Net income — — — — — 689,999 689,999 Balance – March 31, 2025 (unaudited) — — 5,750,000 575 — ( 12,079,251 ) ( 12,078,676 ) Accretion for Class A ordinary shares to redemption amount — — — — — ( 2,477,726 ) ( 2,477,726 ) Net income — — — — — 601,027 601,027 Balance – June 30, 2025 (unaudited) — $ — 5,750,000 $ 575 $ — $ ( 13,955,950 ) $ ( 13,955,375 ) Accretion for Class A ordinary shares to redemption amount — — — — — ( 2,508,797 ) ( 2,508,797 ) Net income — — — — — 1,927,839 1,927,839 Balance – September 30, 2025 (unaudited) — $ — 5,750,000 $ 575 $ — $ ( 14,536,908 ) $ ( 14,536,333 ) FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2024 AND FOR THE PERIOD FROM APRIL 4, 2024 (INCEPTION) THROUGH SEPTEMBER 30, 2024 Class A Ordinary Shares Class B Ordinary Shares Additional Paid-in Accumulated Total Shareholder’ s Shares Amount Shares Amount Capital Deficit Deficit Balance – April 4, 2024 (inception) — $ — — $ — $ — $ — $ — Issuance of Class B ordinary shares to Sponsor (1) — — 5,750,000 575 24,425 — 25,000 Net loss — — — — — ( 52,663 ) ( 52,663 ) Balance – June 30, 2024 — — 5,750,000 575 24,425 ( 52,663 ) ( 27,663 ) Accretion for Class A ordinary shares to redemption amount — — — — ( 7,348,508 ) ( 11,021,304 ) ( 18,369,812 ) Sale of 6,850,000 Private Placement Warrants — — — — 6,850,000 — 6,850,000 Fair value of Public Warrants at issuance — — — — 529,000 — 529,000 Allocated value of transaction costs — — — — ( 54,917 ) — ( 54,917 ) Net income — — — — — 1,071,221 1,071,221 Balance – September 30, 2024 — $ — 5,750,000 $ 575 $ — $ ( 10,002,746 ) $ ( 10,002,171 ) (1) Includes up to 750,000 Class B ordinary shares subject to forfeiture if the over-allotment option is not exercised in full or in part by the underwriters (Note 6). On August 19, 2024, the Company consummated its IPO and sold 23,000,000 Units, including 3,000,000 Units sold pursuant to the full exercise of the underwriters’ option to purchase additional units to cover the over-allotment, hence the 750,000 shares of Class B ordinary shares were no longer subject to forfeiture. The accompanying notes are an integral part of the unaudited condensed consolidated financial statements. 4 HCM II ACQUISITION CORP. CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) For The Nine Months Ended September 30, For The Period from April 4, 2024 (Inception) To September 30, 2025 2024 Cash Flows from Operating Activities: Net income $ 3,218,865 $ 1,018,558 Adjustments to reconcile net income to net cash used in operating activities: Formation costs paid by Sponsor in exchange for issuance of Class B ordinary shares — 12,463 Formation and operational costs paid through promissory note – related party — 45,200 Interest earned on marketable securities held in Trust Account ( 7,449,387 ) ( 1,349,715 ) Initial loss on forward purchase agreement liability 893,425 — Change in fair value of forward purchase agreement liability ( 893,425 ) — Changes in operating assets and liabilities: Other receivable 41,250 ( 41,250 ) Prepaid expenses ( 15,482 ) ( 60,869 ) Short-term prepaid insurance 15,042 ( 90,250 ) Long-term prepaid insurance 52,646 ( 75,208 ) Accrued expenses 3,081,364 246,941 Net cash used in operating activities ( 1,055,702 ) ( 294,130 ) Cash Flows from Investing Activities: Investment of cash into Trust Account — ( 231,150,000 ) Net cash used in investing activities — ( 231,150,000 ) Cash Flows from Financing Activities: Proceeds from sale of Units, net of underwriting discounts paid — 226,000,000 Proceeds from sale of Private Placements Warrants — 6,850,000 Advances from related party 338,002 — Proceeds from promissory note - related party 400,000 — Repayment of promissory note - related party — ( 233,127 ) Payment of offering costs — ( 347,609 ) Net cash provided by financing activities 738,002 232,269,264 Net Change in Cash ( 317,700 ) 825,134 Cash – Beginning of period 668,089 — Cash – End of period $ 350,389 $ 825,134 Non-Cash investing and financing activities: Accrued offering costs $ — $ 127,941 Deferred offering costs paid by Sponsor in exchange for issuance of Class B ordinary shares $ — $ 12,537 Deferred offering costs paid through promissory note – related party $ — $ 187,927 Deferred underwriting fee payable $ — $ 10,720,000 The accompanying notes are an integral part of the unaudited condensed consolidated financial statements. 5 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS HCM II Acquisition Corp. (the “Company”) is a blank check company incorporated as a Cayman Islands exempted corporation on April 4, 2024. The Company was incorporated for the purpose of effecting a merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization or similar Business Combination with one or more businesses (the “Business Combination”). The Company has a wholly owned subsidiary that was created on March 4, 2025, AKOM Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of the Company (“Merger Sub”). The transactions contemplated by the Merger Agreement are intended to serve as the Company’s initial Business Combination. See Note 6 for further information. On March 26, 2025, the Company entered into a Business Combination Agreement (as it may be amended, supplemented or otherwise modified from time to time in accordance with its terms, the “Business Combination Agreement”) by and among the Company, Terrestrial Energy Inc., a Delaware corporation (“Terrestrial Energy”), and HCM II Merger Sub Inc., a Delaware corporation and a direct wholly owned subsidiary of Company (“Merger Sub”), pursuant to which, among other things and subject to the terms and conditions contained therein, Merger Sub will merge with and into Terrestrial Energy (the “Merger”), with Terrestrial Energy continuing as the surviving entity (the “Surviving Company”). The transactions contemplated by the Business Combination Agreement are referred to herein as the “Business Combination.” The combined company’s business will continue to operate through Terrestrial Energy and its subsidiaries. Pursuant to the Business Combination Agreement, the aggregate consideration to be paid in the Merger in respect of each Terrestrial Energy Common Share and each Terrestrial Energy Series A Preferred Share that is issued and outstanding immediately prior to the Effective Time (as defined in the Business Combination Agreement), will be a number of shares of Domesticated Common Stock equal to the Exchange Ratio (the “ Per Share Base Consideration ”). The “ Exchange Ratio ” is equal to the number of shares of Domesticated Common Stock equal to the quotient of (i)(a) $ 925,000,000 , divided by (b) the Redemption Price divided by (ii) the Terrestrial Energy Fully Diluted Capital (as defined in the Business Combination Agreement). The Company has also entered into subscription agreements (collectively, the “PIPE Subscription Agreements”), each dated as of March 26, 2025, with certain investors (collectively, the “PIPE Investors”), pursuant to which, among other things, the Company has agreed to issue and sell, in private placements to close immediately prior to or substantially concurrently with the Closing, an aggregate of 5,000,000 shares of Domesticated Common Stock for a purchase price of $ 10.00 per share (the “PIPE Financing”). The PIPE Investors are permitted, under the PIPE Subscription Agreements, to satisfy their commitments thereunder if they hold shares of Domesticated Common Stock that qualify as Non-Redeemed Shares (as defined in the PIPE Subscription Agreements), subject to certain conditions and restrictions set forth in the PIPE Subscription Agreements (see Note 6 for details). As of September 30, 2025, the Company had not commenced any operations. All activity for the period from April 4, 2024 (inception) through September 30, 2025 relates to the Company’s formation and the initial public offering (“Initial Public Offering”), which is described below. The Company will not generate any operating revenues until after the completion of its initial Business Combination, at the earliest. The Company generates non-operating income in the form of interest income from the proceeds derived from the Initial Public Offering. The Company has selected December 31 as its fiscal year end. The registration statement for the Company’s Initial Public Offering was declared effective on August 15, 2024. On August 19, 2024, the Company consummated the Initial Public Offering of 23,000,000 units (the “Units” and, with respect to the shares of Class A ordinary shares included in the Units being offered, the “Public Shares”), which includes the full exercise by the underwriter of its over-allotment option in the amount of 3,000,000 Units, at $ 10.00 per Unit, generating gross proceeds of $ 230,000,000 , which is described in Note 3. 6 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of an aggregate of 6,850,000 warrants (the “Private Placement Warrants”) at a price of $ 1.00 per Private Placement Warrant, in a private placement to the Company’s sponsor, HCM Investor Holdings II, LLC (the “Sponsor”), and Cantor Fitzgerald & Co., the representative of the underwriter of the initial Public Offering, generating gross proceeds of $ 6,850,000 , which is described in Note 4. Transaction costs amounted to $ 15,396,014 , consisting of $ 4,000,000 of cash underwriting fee, $ 10,720,000 of deferred underwriting fee (see additional discussion in Note 6), and $ 676,014 of other offering costs. The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering and the Private Placement Warrants, although substantially all of the net proceeds are intended to be generally applied toward consummating a Business Combination (less deferred underwriting commissions). The Company’s Business Combination must be with one or more target businesses that together have a fair market value equal to at least 80 % of the net balance in the Trust Account (as defined below) (excluding the amount of deferred underwriting discounts held and taxes payable on the income earned on the Trust Account) at the time of the signing an agreement to enter into a Business Combination. However, the Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50 % or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act of 1940, as amended (the “Investment Company Act”). There is no assurance that the Company will be able to successfully effect a Business Combination. Following the closing of the Initial Public Offering, on August 19, 2024, an amount of $ 231,150,000 ($ 10.05 per Unit) from the net proceeds of the sale of the Units and the sale of the Private Placement Warrants was placed in the trust account (the “Trust Account”), with Continental Stock Transfer & Trust Company acting as trustee and will be invested in U.S. government treasury obligations with a maturity of 185 days or less or in money market funds meeting certain conditions under Rule 2a-7 under the Investment Company Act, which invest only in direct U.S. government treasury obligations; the holding of these assets in this form is intended to be temporary and for the sole purpose of facilitating the intended business combination. To mitigate the risk that might be deemed to be an investment company for purposes of the Investment Company Act, which risk increases the longer that the Company holds investments in the Trust Account, the Company may, at any time (based on management team’s ongoing assessment of all factors related to the potential status under the Investment Company Act), instruct the trustee to liquidate the investments held in the Trust Account and instead to hold the funds in the Trust Account in cash or in an interest bearing demand deposit account at a bank. Nevertheless, the Company may be considered to be operating as an investment company and if the Company is deemed as such compliance with additional regulatory burdens would require additional expenses for which the Company has not allotted funds and would severely hinder the Company’s ability to compete a business combination. Except with respect to interest earned on the funds held in the Trust Account that may be released to the Company to pay its taxes, if any, the proceeds from the Initial Public Offering and the sale of the Private Placement Warrants will not be released from the Trust Account until the earliest of (i) the completion of the Company’s initial Business Combination, (ii) the redemption of the Company’s public shares if the Company is unable to complete the initial Business Combination within 24 months from the closing of the Initial Public Offering or by such earlier liquidation date as the board of directors may approve (the “Completion Window”), subject to applicable law, or (iii) the redemption of the Company’s public shares properly submitted in connection with a shareholder vote to amend the Company’s amended and restated memorandum and articles of association to (A) modify the substance or timing of the Company’s obligation to allow redemption in connection with the initial Business Combination or to redeem 100 % of the Company’s public shares if the Company has not consummated an initial Business Combination within the Completion Window or (B) with respect to any other material provisions relating to shareholders’ rights or pre-initial Business Combination activity. The proceeds deposited in the Trust Account could become subject to the claims of the Company’s creditors, if any, which could have priority over the claims of the Company’s public shareholders. 7 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) The Company will provide the Company’s public shareholders with the opportunity to redeem all or a portion of their public shares upon the completion of the initial Business Combination either (i) in connection with a general meeting called to approve the initial Business Combination or (ii) without a shareholder vote by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a proposed initial Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The public shareholders will be entitled to redeem their shares at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account calculated as of two business days prior to the consummation of the initial Business Combination, including interest earned on the funds held in the Trust Account (less taxes payable), divided by the number of then outstanding public shares, subject to the limitations. The amount in the Trust Account is initially anticipated to be $ 10.05 per public share. The ordinary shares subject to redemption were recorded at a redemption value and classified as temporary equity upon the completion of the Initial Public Offering, in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 480, “Distinguishing Liabilities from Equity.” In such case, if the Company seeks shareholder approval, a majority of the issued and outstanding shares voted are voted in favor of the Business Combination. The Company will have only the duration of the Completion Window to complete the initial Business Combination. However, if the Company is unable to complete its initial Business Combination within the Completion Window, the Company will as promptly as reasonably possible but not more than ten business days thereafter, redeem the public shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account (less taxes payable and up to $ 100,000 of interest to pay dissolution expenses), divided by the number of then outstanding public shares, which redemption will constitute full and complete payment for the public shares and completely extinguish public shareholders’ rights as shareholders (including the right to receive further liquidation or other distributions, if any), subject to the Company’s obligations under Cayman Islands law to provide for claims of creditors and subject to the other requirements of applicable law. The Sponsor, officers and directors have entered into a letter agreement with the Company, pursuant to which they have agreed to (i) waive their redemption rights with respect to their founder shares and public shares in connection with the completion of the initial Business Combination; (ii) waive their redemption rights with respect to their founder shares and public shares in connection with a shareholder vote to approve an amendment to the Company’s amended and restated memorandum and articles of association; (iii) waive their rights to liquidating distributions from the Trust Account with respect to their founder shares if the Company fails to complete the initial Business Combination within the Completion Window, although they will be entitled to liquidating distributions from the Trust Account with respect to any public shares they hold if the Company fails to complete the initial Business Combination within the Completion Window and to liquidating distributions from assets outside the Trust Account; and (iv) vote any founder shares held by them and any public shares purchased during or after the Initial Public Offering (including in open market and privately negotiated transactions, aside from shares they may purchase in compliance with the requirements of Rule 14e-5 under the Exchange Act, which would not be voted in favor of approving the Business Combination) in favor of the initial Business Combination. The Company’s Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $ 10.05 per public share and (ii) the actual amount per public share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $ 10.05 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriter of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). However, the Company has not asked the Sponsor to reserve for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and the Company believes that the Sponsor’s only assets are securities of the Company. Therefore, the Company cannot assure that the Sponsor would be able to satisfy those obligations. 8 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) Liquidity and Going Concern As of September 30, 2025, the Company had $ 350,389 in its operating bank account and working capital deficit of $ 3,816,333 . Subsequent to the balance sheet date, on October 28, 2025, the Company completed its business combination with Terrestrial Energy Inc. (“Terrestrial Energy”), a developer of advanced nuclear power technology. In connection with the closing, HCM II Acquisition Corp. was renamed Terrestrial Energy Inc., and the combined company’s securities began trading on the Nasdaq Stock Market under the ticker symbols “IMSR” and “IMSRW” on October 29, 2025. The transaction generated gross proceeds exceeding $ 292 million before expenses, including a previously placed $ 50 million PIPE investment and a negligible level of redemptions by public shareholders. The resulting cash proceeds substantially improve the Company’s liquidity position and are expected to provide adequate funding for at least twelve months following issuance of these financial statements. Accordingly, management believes that the completion of the Business Combination and the related financing transactions have alleviated the substantial doubt about the Company’s ability to continue as a going concern that existed as of September 30, 2025. 9 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) NOTE 2. SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and in accordance with the instructions to Form 10-Q and Article 8 of Regulation S-X of the U.S. Securities and Exchange Commission (“SEC”). Certain information or footnote disclosures normally included in unaudited condensed consolidated financial statements prepared in accordance with GAAP have been condensed or omitted, pursuant to the rules and regulations of the SEC for interim financial reporting. Accordingly, they do not include all the information and footnotes necessary for a complete presentation of financial position, results of operations, or cash flows. In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the financial position, operating results and cash flows for the periods presented. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K as filed with the SEC on March 31, 2025. The interim results for the three and nine months ended September 30, 2025, are not necessarily indicative of the results to be expected for the year ending December 31, 2025 or for any future periods. Principles of Consolidation The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiary, which was formed on March 4, 2025. All significant intercompany balances and transactions have been eliminated in consolidation. Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statements with another public company which is neither an emerging growth company nor an emerging growth company which has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used. Use of Estimates The preparation of unaudited condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of expenses during the reporting period. Actual results could differ from those estimates. Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had $ 350,389 and $ 668,089 in cash and no cash equivalents as of September 30, 2025 and December 31, 2024, respectively. 10 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) Marketable Securities Held in Trust Account As of September 30, 2025 and December 31, 2024, the assets held in the Trust Account, amounting to $ 242,642,972 and $ 235,193,585 , were held in a Money Market Mutual Fund, respectively. Offering Costs The Company complies with the requirements of the ASC 340-10-S99 and SEC Staff Accounting Bulletin Topic 5A, “Expenses of Offering.” Deferred offering costs consist principally of professional and registration fees that are related to the Initial Public Offering. FASB ASC 470-20, “Debt with Conversion and Other Options,” addresses the allocation of proceeds from the issuance of convertible debt into its equity and debt components. The Company applies this guidance to allocate Initial Public Offering proceeds from the Units between Class A ordinary shares and warrants, using the residual method by allocating Initial Public Offering proceeds first to assigned value of the warrants and then to the Class A ordinary shares. Offering costs allocated to the Class A ordinary shares were charged to temporary equity and offering costs allocated to the Public and Private Placement Warrants were charged to shareholders’ equity as Public and Private Placement Warrants after management’s evaluation were accounted for under equity treatment. Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under FASB ASC 820, “Fair Value Measurements and Disclosures,” approximates the carrying amounts represented in the condensed consolidated balance sheets, primarily due to their short-term nature. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of a cash account in a financial institution, which, at times, may exceed the Federal Deposit Insurance Corporation coverage limit of $ 250,000 . Any loss incurred or a lack of access to such funds could have a significant adverse impact on the Company’s financial condition, results of operations, and cash flows. Income Taxes The Company accounts for income taxes under ASC Topic 740, “Income Taxes,” which requires an asset and liability approach to financial accounting and reporting for income taxes. Deferred income tax assets and liabilities are computed for differences between the unaudited condensed consolidated financial statements and tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC Topic 740 prescribes a recognition threshold and a measurement attribute for the unaudited condensed consolidated financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more likely than not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. As of September 30, 2025 and December 31, 2024, there were no unrecognized tax benefits and no amounts accrued for interest and penalties. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position. The Company is considered to be an exempted Cayman Islands company with no connection to any other taxable jurisdiction and is presently not subject to income taxes or income tax filing requirements in the Cayman Islands or the United States. As such, the Company’s tax provision was zero for the period presented. Net Income per Ordinary Share The Company complies with accounting and disclosure requirements of FASB ASC Topic 260, “Earnings Per Share.” Net income per ordinary share is computed by dividing net income by the weighted average number of shares of ordinary shares outstanding for the period. The Company has two classes of ordinary shares, which are referred to as Class A ordinary Shares and Class B ordinary shares. Accretion associated with the redeemable shares of Class A Ordinary Shares is excluded from income per ordinary share as the redemption value approximates fair value. 11 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) The following tables reflect the calculation of basic and diluted net income per ordinary share (in dollars, except per share amounts): For the Three Months Ended For the Nine Months Ended September 30, 2025 September 30, 2025 Class A Class B Class A Class B Basic and diluted net income per ordinary share Numerator: Allocation of net income $ 1,542,271 $ 385,568 $ 2,575,092 $ 643,773 Denominator: Basic weighted average shares outstanding 23,000,000 5,750,000 23,000,000 5,750,000 Basic and diluted net income per ordinary share $ 0.07 $ 0.07 $ 0.11 $ 0.11 For the Three Months Ended September 30, 2024 For the Period from April 4, 2024 (Inception) Through September 30, 2024 Class A Class B Class A Class B Basic net income per ordinary share Numerator: Allocation of net income $ 694,846 $ 376,375 $ 498,886 $ 519,672 Denominator: Basic weighted average shares outstanding 10,615,385 5,750,000 5,396,648 5,621,508 Basic net income per ordinary share $ 0.07 $ 0.07 $ 0.09 $ 0.09 For the Three Months Ended September 30, 2024 For the Period from April 4, 2024 (Inception) Through September 30, 2024 Class A Class B Class A Class B Diluted net income per ordinary share Numerator: Allocation of net income $ 694,846 $ 376,375 $ 510,005 $ 508,553 Denominator: Diluted weighted average shares outstanding 10,615,385 5,750,000 5,396,648 5,621,508 Diluted net income per ordinary share $ 0.07 $ 0.07 $ 0.09 $ 0.09 Warrant Instruments The Company accounted for the 11,500,000 Public and 6,850,000 Private Warrants issued in connection with the Initial Public Offering and the private placement in accordance with the guidance contained in FASB ASC Topic 815, “Derivatives and Hedging”. Accordingly, the Company evaluated and classified the warrant instruments under equity treatment at their assigned values. Such guidance provides that the warrants described above were not precluded from equity classification. Equity-classified contracts are initially measured at fair value (or allocated value). Subsequent changes in fair value are not recognized as long as the contracts continue to be classified in equity in accordance with ASC 480 and ASC 815. Forward Purchase Agreement Liability On March 26, 2025, the Company entered into a Forward Purchase Agreement. The Company accounts for the Forward Purchase Agreement as a derivative instrument in accordance with the guidance in ASC 815-40. The instrument is subject to re-measurement at each balance sheet date, with changes in fair value recognized in the condensed consolidated statement of operations. The ability of the Company to receive any of the proceeds of the Forward Purchase Agreement is dependent upon the financial metrics of the business combination target, among other factors, rendering the receipt of such proceeds outside the control of the Company. As of September 30, 2025 and December 31, 2024, the fair value of the forward purchase derivative liability was $0 . 12 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) Class A Redeemable Share Classification The public shares contain a redemption feature which allows for the redemption of such public shares in connection with the Company’s liquidation, or if there is a shareholder vote or tender offer in connection with the Company’s initial Business Combination. In accordance with ASC 480-10-S99, the Company classifies public shares subject to redemption outside of permanent equity as the redemption provisions are not solely within the control of the Company. The Company recognizes changes in redemption value immediately as they occur and will adjust the carrying value of redeemable shares to equal the redemption value at the end of each reporting period. Immediately upon the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount value. The change in the carrying value of redeemable shares will result in charges against additional paid-in capital (to the extent available) and accumulated deficit. Accordingly, as of September 30, 2025 and December 31, 2024, Class A ordinary shares subject to possible redemption are presented at redemption value as temporary equity, outside of the shareholders’ deficit section of the Company’s condensed consolidated balance sheets. As of September 30, 2025 and December 31, 2024, the Class A ordinary shares subject to redemption reflected in the condensed consolidated balance sheets are reconciled in the following table: Gross proceeds $ 230,000,000 Less: Proceeds allocated to Public Warrants ( 529,000 ) Class A ordinary shares issuance costs ( 15,341,097 ) Plus: Accretion of carrying value to redemption value 21,063,682 Class A ordinary shares subject to possible redemption, December 31, 2024 235,193,585 Plus: Accretion of carrying value to redemption value 2,462,864 Class A ordinary shares subject to possible redemption, March 31, 2025 237,656,449 Plus: Accretion of carrying value to redemption value 2,477,726 Class A ordinary shares subject to possible redemption, June 30, 2025 240,134,175 Plus: Accretion of carrying value to redemption value 2,508,797 Class A ordinary shares subject to possible redemption, September 30, 2025 $ 242,642,972 13 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) Recent Accounting Pronouncements In November 2024, the FASB issued Accounting Standards Update (“ASU”) 2024-03, “Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses”, requiring public entities to disclose additional information about specific expense categories in the notes to the financial statements on an interim and annual basis. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the impact of adopting ASU 2024-03. Management does not believe that any recently other issued, but not effective, accounting standards, if currently adopted, would have a material effect on the Company’s unaudited condensed consolidated financial statements. NOTE 3. INITIAL PUBLIC OFFERING Pursuant to the Initial Public Offering, on August 19, 2024 the Company sold 23,000,000 Units, which includes the full exercise by the underwriter of its over-allotment option in the amount of 3,000,000 Units, at a price of $ 10.00 per Unit. Each Unit consists of one Class A ordinary share and one-half of one redeemable Public Warrant. Each Public Warrant entitles the holder to purchase one Class A ordinary share at a price of $ 11.50 per share, subject to adjustment (see Note 4). Each warrant will become exercisable 30 days after the completion of the initial Business Combination and will expire five years after the completion of the initial Business Combination, or earlier upon redemption or liquidation. Warrants— As of September 30, 2025 and December 31, 2024, there were 18,350,000 warrants outstanding, including 11,500,000 Public Warrants and 6,850,000 Private Placement Warrants. Each whole warrant entitles the holder to purchase one Class A ordinary share at a price of $ 11.50 per share, subject to adjustment as discussed herein. The warrants cannot be exercised until 30 days after the completion of the initial Business Combination, and will expire at 5:00 p.m., New York City time, five years after the completion of the initial Business Combination or earlier upon redemption or liquidation. On October 10, 2024, the Company announced that, commencing on October 10, 2024, the holders of units issued in its Initial Public Offering may elect to separately trade shares of Class A ordinary shares and warrants included in the Units. No fractional warrants will be issued upon separation of the Units and only whole warrants will trade. The Units not separated will continue to trade on the Nasdaq under the symbol “HONDU.” Shares of Class A ordinary shares and the warrants are expected to trade on the Nasdaq under the symbols “HOND” and “HONDW,” respectively. The Company will not be obligated to deliver any Class A ordinary shares pursuant to the exercise of a warrant and will have no obligation to settle such warrant exercise unless a registration statement under the Securities Act with respect to the Class A ordinary shares underlying the warrants is then effective and a prospectus relating thereto is current. No warrant will be exercisable and the Company will not be obligated to issue a Class A ordinary share upon exercise of a warrant unless the Class A ordinary share issuable upon such warrant exercise has been registered, qualified or deemed to be exempt under the securities laws of the state of residence of the registered holder of the warrants. In the event that the conditions in the two immediately preceding sentences are not satisfied with respect to a warrant, the holder of such warrant will not be entitled to exercise such warrant and such warrant may have no value and expire worthless. In no event will the Company be required to net cash settle any warrant. In the event that a registration statement is not effective for the exercised warrants, the purchaser of a unit containing such warrant will have paid the full purchase price for the unit solely for the Class A ordinary share underlying such unit. Under the terms of the warrant agreement, the Company has agreed that, as soon as practicable, but in no event later than 20 business days, after the closing of its Business Combination, it will use commercially reasonable efforts to file with the SEC a post-effective amendment to the registration statement for the Initial Public Offering or a new registration statement covering the registration under the Securities Act of the Class A ordinary shares issuable upon exercise of the warrants and thereafter will use its commercially reasonable efforts to cause the same to become effective within 60 business days following the Company’s initial Business Combination and to maintain a current prospectus relating to the Class A ordinary shares issuable upon exercise of the warrants until the expiration of the warrants in accordance with the provisions of the warrant agreement. If a registration statement covering the Class A ordinary shares issuable upon exercise of the warrants is not effective by the sixtieth (60 th ) business day after the closing of the initial Business Combination, warrant holders may, until such time as there is an effective registration statement and during any period when the Company will have failed to maintain an effective registration statement, exercise warrants on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act or another exemption. Notwithstanding the above, if the Class A ordinary shares are at the time of any exercise of a warrant not listed on a national securities exchange such that they satisfy the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, require holders of public warrants who exercise their warrants to do so on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act and, in the event the Company so elects, the Company will not be required to file or maintain in effect a registration statement, and in the event the Company does not so elect, the Company will use its commercially reasonable efforts to register or qualify the shares under applicable blue sky laws to the extent an exemption is not available. 14 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) If the holders exercise their public warrants on a cashless basis, they would pay the warrant exercise price by surrendering the warrants for that number of Class A ordinary shares equal to the quotient obtained by dividing (x) the product of the number of Class A ordinary shares underlying the warrants, multiplied by the excess of the “fair market value” of the Class A ordinary shares over the exercise price of the warrants by (y) the fair market value. The “fair market value” is the average reported closing price of the Class A ordinary shares for the 10 trading days ending on the third trading day prior to the date on which the notice of exercise is received by the warrant agent or on which the notice of redemption is sent to the holders of warrants, as applicable. Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $ 18.00 : The Company may redeem the outstanding warrants: Once the warrants become exercisable, the Company may redeem the outstanding warrants (except as described herein with respect to the private placement warrants): ● in whole and not in part; ● at a price of $ 0.01 per warrant; ● upon a minimum of 30 days’ prior written notice of redemption (the “30-day redemption period”); and ● if, and only if, the closing price of the Class A ordinary shares equals or exceeds $ 18.00 per share (as adjusted for adjustments to the number of shares issuable upon exercise or the exercise price of a warrant) for any 20 trading days within a 30 -trading day period commencing at least 30 days after completion of the initial business combination and ending three business days before the Company sends the notice of redemption to the warrant holders. Additionally, if the number of outstanding Class A ordinary shares is increased by a share capitalization payable in Class A ordinary shares, or by a subdivision of ordinary shares or other similar event, then, on the effective date of such share capitalization, subdivision or similar event, the number of Class A ordinary shares issuable on exercise of each warrant will be increased in proportion to such increase in the outstanding ordinary shares. A rights offering made to all or substantially all holders of ordinary shares entitling holders to purchase Class A ordinary shares at a price less than the fair market value will be deemed a share capitalization of a number of Class A ordinary shares equal to the product of (i) the number of Class A ordinary shares actually sold in such rights offering (or issuable under any other equity securities sold in such rights offering that are convertible into or exercisable for Class A ordinary shares) and (ii) the quotient of (x) the price per Class A ordinary share paid in such rights offering and (y) the fair market value. For these purposes (i) if the rights offering is for securities convertible into or exercisable for Class A ordinary shares, in determining the price payable for Class A ordinary shares, there will be taken into account any consideration received for such rights, as well as any additional amount payable upon exercise or conversion and (ii) fair market value means the volume weighted average price of Class A ordinary shares as reported during the ten ( 10 ) trading day period ending on the trading day prior to the first date on which the Class A ordinary shares trade on the applicable exchange or in the applicable market, regular way, without the right to receive such rights. NOTE 4. PRIVATE PLACEMENT Simultaneously with the closing of the Initial Public Offering, the Sponsor and Cantor Fitzgerald & Co. purchased an aggregate of 6,850,000 warrants, each exercisable to purchase one Class A ordinary share at $ 11.50 per share, at a price of $ 1.00 per warrant, or $ 6,850,000 in the aggregate, in a private placement. Of those 6,850,000 Private Placement Warrants, the Sponsor purchased 4,275,000 Private Placement Warrants and Cantor Fitzgerald & Co. purchased 2,575,000 Private Placement Warrants. Each whole warrant entitles the registered holder to purchase one Class A ordinary share at a price of $ 11.50 per share, subject to adjustment. The Private Placement Warrants were identical to the Public Warrants sold in the Initial Public Offering except that, so long as they are held by the Sponsor, Cantor Fitzgerald & Co. or their permitted transferees, the Private Placement Warrants (i) may not (including the Class A ordinary shares issuable upon exercise of these Private Placement Warrants), subject to certain limited exceptions, be transferred, assigned or sold by the holders until 30 days after the completion of the initial Business Combination, (ii) will be entitled to registration rights and (iii) with respect to private placement warrants held by Cantor Fitzgerald & Co. and/or its designees, will not be exercisable more than five years from the commencement of sales in this offering in accordance with Financial Industry Regulatory Authority Rule 5110(g)(8). 15 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) The Sponsor, officers and directors have entered into a letter agreement with the Company, pursuant to which they have agreed to (i) waive their redemption rights with respect to their founder shares and public shares in connection with the completion of the initial Business Combination; (ii) waive their redemption rights with respect to their founder shares and public shares in connection with a shareholder vote to approve an amendment to the Company’s amended and restated memorandum and articles of association (A) to modify the substance or timing of the Company’s obligation to allow redemption in connection with the initial Business Combination or to redeem 100 % of the public shares if the Company has not consummated an initial Business Combination within the Completion Window or (B) with respect to any other material provisions relating to shareholders’ rights or pre-initial Business Combination activity; (iii) waive their rights to liquidating distributions from the Trust Account with respect to their founder shares if the Company fails to complete the initial Business Combination within the Completion Window, although they will be entitled to liquidating distributions from the Trust Account with respect to any public shares they hold if the Company fails to complete the initial Business Combination within the Completion Window and to liquidating distributions from assets outside the Trust Account; and (iv) vote any founder shares held by them and any public shares purchased during or after the Initial Public Offering (including in open market and privately negotiated transactions, aside from shares they may purchase in compliance with the requirements of Rule 14e-5 under the Exchange Act, which would not be voted in favor of approving the Business Combination) in favor of the initial Business Combination. NOTE 5. RELATED PARTY TRANSACTIONS Founder Shares On April 8, 2024, the Sponsor made a capital contribution of $ 25,000 , or approximately $ 0.004 per share, to cover certain of the Company’s expenses, for which the Company issued 5,750,000 founders shares to the Sponsor. Up to 750,000 of the founder shares may be surrendered by the Sponsor for no consideration depending on the extent to which the underwriter’s over-allotment is exercised. On August 19, 2024, the underwriter exercised its over-allotment option in full as part of the closing of the Initial Public Offering. As such, the 750,000 founder shares are no longer subject to forfeiture. The Company’s initial shareholders have agreed not to transfer, assign or sell any of their founder shares and any Class A ordinary shares issued upon conversion thereof until the earlier to occur of (i) one year after the completion of the initial Business Combination or (ii) the date on which the Company completes a liquidation, merger, share exchange or other similar transaction after the initial Business Combination that results in all of the Company’s shareholders having the right to exchange their Class A ordinary shares for cash, securities or other property. Any permitted transferees will be subject to the same restrictions and other agreements of the Company’s initial shareholders with respect to any founder shares (the “Lock-up”). Notwithstanding the foregoing, if (1) the closing price of the Class A ordinary shares equals or exceeds $ 12.00 per share (as adjusted for share subdivision, share capitalizations, reorganizations, recapitalizations and the like) for any 20 trading days within any 30 -trading day period commencing at least 150 days after the initial Business Combination or (2) if the Company consummates a transaction after the initial Business Combination which results in the Company’s shareholders having the right to exchange their shares for cash, securities or other property, the founder shares will be released from the Lock-up. Promissory Note—Related Party The Sponsor has agreed to loan the Company an aggregate of up to $ 300,000 to be used for a portion of the expenses of the Initial Public Offering. The loan is non-interest bearing, unsecured and due at the earlier of December 31, 2024 or the closing of the Initial Public Offering. The Company repaid all the outstanding balance of the note at the closing of the Initial Public Offering on August 19, 2024. Borrowings under the note are no longer available. On August 14, 2025, the Company entered into a Promissory Note agreement with Hondo Holdings LLC (the “Sponsor”), pursuant to which the Sponsor agreed to make available to the Company up to $ 2,500,000 to fund working capital needs and expenses related to the completion of the Company’s initial business combination. The Promissory Note is non-interest bearing, may be prepaid at any time without penalty, and becomes due and payable upon the earlier of (i) the consummation of a business combination or (ii) the liquidation of the Company. At the Sponsor’s election, up to $ 1,500,000 of the unpaid principal balance may be converted into private placement warrants of the Company at a conversion price of $ 1.00 per warrant, with terms identical to those issued in the Company’s IPO. The Sponsor waived any right, title, interest, or claim to the Company’s trust account. As of September 30, 2025, the outstanding principal balance under the Promissory Note was $ 400,000 . The Promissory Note is classified as a liability and accounted for under ASC 470, “Debt”, as a freestanding financial instrument. The embedded conversion option was evaluated under ASC 815-15 and ASC 815-40 and determined to meet the criteria for equity classification. Accordingly, the Promissory Note is carried at par value with no bifurcated derivative or imputed interest recognized. Administrative Services Agreement The Company entered into an agreement, commencing on August 15, 2024, through the earlier of consummation of the initial Business Combination and the liquidation, to pay the Sponsor $ 15,000 per month for office space, utilities and secretarial and administrative support services. For the three and nine months ended September 30, 2025, the Company incurred and paid $ 45,000 and $ 135,000 for these services, respectively. For the period from April 4, 2024 (inception) through September 30, 2024, the Company incurred $ 17,500 for these services. 16 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) Due from Sponsor The Company covered certain expenses on behalf of its Sponsor, paying $ 4,466 as of September 30, 2025 and December 31, 2024, of which such amount is included in due from Sponsor in the accompanying condensed consolidated balance sheets. Advances from Related Party Advances from related party represents payment of expenses by the Sponsor that are not covered by the Promissory Note. As of September 30, 2025, total advances from related party amounted to $ 338,002 . These advances are due on demand. Related Party Loans In order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor or certain of the Company’s officers and directors may, but are not obligated to, loan the Company funds as may be required (the “Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans. In the event that a Business Combination does not close, the Company may use a portion of the working capital held outside the Trust Account to repay the Working Capital Loans but no proceeds from the Trust Account would be used to repay the Working Capital Loans. Up to $ 1,500,000 of such Working Capital Loans may be convertible into private placement warrants of the post Business Combination entity at a price of $ 1.00 per warrant at the option of the lender. The warrants would be identical to the Private Placement Warrants. As of September 30, 2025 and December 31, 2024, no such Working Capital Loans were outstanding. NOTE 6. COMMITMENTS AND CONTINGENCIES Risks and Uncertainties The United States and global markets are experiencing volatility and disruption following the geopolitical instability resulting from the ongoing Russia-Ukraine conflict and the recent escalation of the Israel-Hamas conflict. In response to the ongoing Russia-Ukraine conflict, the North Atlantic Treaty Organization (“NATO”) deployed additional military forces to Eastern Europe, and the United States, the United Kingdom, the European Union and other countries have announced various sanctions and restrictive actions against Russia, Belarus and related individuals and entities, including the removal of certain financial institutions from the Society for Worldwide Interbank Financial Telecommunication (SWIFT) payment system. Certain countries, including the United States, have also provided and may continue to provide military aid or other assistance to Ukraine and to Israel, increasing geopolitical tensions among a number of nations. The invasion of Ukraine by Russia and the escalation of the Israel-Hamas conflict and the resulting measures that have been taken, and could be taken in the future, by NATO, the United States, the United Kingdom, the European Union, Israel and its neighboring states and other countries have created global security concerns that could have a lasting impact on regional and global economies. Although the length and impact of the ongoing conflicts are highly unpredictable, they could lead to market disruptions, including significant volatility in commodity prices, credit and capital markets, as well as supply chain interruptions and increased cyberattacks against U.S. companies. Additionally, any resulting sanctions could adversely affect the global economy and financial markets and lead to instability and lack of liquidity in capital markets. Any of the above-mentioned factors, or any other negative impact on the global economy, capital markets or other geopolitical conditions resulting from the Russian invasion of Ukraine, the escalation of the Israel-Hamas conflict and subsequent sanctions or related actions, could adversely affect the Company’s search for an initial Business Combination and any target business with which the Company may ultimately consummate an initial Business Combination. Registration Rights The holders of the founder shares, Private Placement Warrants and the Class A ordinary shares underlying such Private Placement Warrants and Private Placement Warrants and warrants that may be issued upon conversion of the Working Capital Loans will have registration rights to require the Company to register a sale of any of the Company’s securities held by them and any other securities of the Company acquired by them prior to the consummation of the initial Business Combination pursuant to a registration rights agreement to be signed prior to or on the effective date of the Initial Public Offering. The holders of these securities are entitled to make up to three demands, excluding short form demands, that the Company registers such securities. In addition, the holders have certain piggyback registration rights with respect to registration statements filed subsequent to the completion of the initial Business Combination. The Company will bear the expenses incurred in connection with the filing of any such registration statements. Underwriter’s Agreement The underwriter has a 45 -day option from the date of the Initial Public Offering to purchase up to an additional 3,000,000 units to cover over-allotments, if any. On August 19, 2024, simultaneously with the closing of the Initial Public Offering, the underwriter elected to fully exercise the over-allotment option to purchase the additional 3,000,000 Units at a price of $ 10.00 per Unit. 17 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) The underwriter was entitled to a cash underwriting discount of $ 4,000,000 ( 2.0 % of the gross proceeds of the units offered in the Initial Public Offering, excluding any proceeds from units sold pursuant to the underwriter’s over-allotment option). Additionally, the underwriter is entitled to a deferred underwriting discount of 4.40 % of the gross proceeds of the Initial Public Offering held in the Trust Account other than those sold pursuant to the underwriter’s over-allotment option and 6.40 % of the gross proceeds sold pursuant to the underwriter’s over-allotment option, $ 10,720,000 in the aggregate, payable upon the completion of the Company’s initial Business Combination subject to the terms of the underwriting agreement. At September 30, 2025 and December 31, 2024, the balance of the deferred underwriting fee payable was $ 10,720,000 . Business Combination Agreement On March 26, 2025, the Company entered into a Business Combination Agreement (as it may be amended, supplemented or otherwise modified from time to time in accordance with its terms, the “Business Combination Agreement”) by and among the Company, Terrestrial Energy, and Merger Sub, pursuant to which, among other things and subject to the terms and conditions contained therein, Merger Sub will merge with and into Terrestrial Energy (the “Merger”), with Terrestrial Energy continuing as the Surviving Company. The combined company’s business will continue to operate through Terrestrial Energy and its subsidiaries. Pursuant to the Business Combination Agreement, the aggregate consideration to be paid in the Merger in respect of each Terrestrial Energy Common Share and each Terrestrial Energy Series A Preferred Share that is issued and outstanding immediately prior to the Effective Time (as defined in the Business Combination Agreement), will be a number of shares of Domesticated Common Stock equal to the Exchange Ratio (the “ Per Share Base Consideration ”). The “ Exchange Ratio ” is equal to the number of shares of Domesticated Common Stock equal to the quotient of (i) (a) $ 925,000,000 , divided by (b) the Redemption Price divided by (ii) the Terrestrial Energy Fully Diluted Capital (as defined in the Business Combination Agreement). The Business Combination Agreement and the Business Combination were unanimously approved by the board of directors of the Company and the board of directors of Terrestrial Energy. The Business Combination is expected to close in the fourth quarter of 2025, subject to the receipt of the required approvals by Company’s shareholders and the fulfilment of other customary closing conditions. In addition to the Merger, the Company will, subject to obtaining the required shareholder approvals and at least one (1) day prior to the date of the closing of the Business Combination (the “Closing”), change its jurisdiction of incorporation by deregistering as a Cayman Islands exempted company and continuing and domesticating as a corporation incorporated under the laws of the State of Delaware (the “Domestication”). The Company will provide its public shareholders the opportunity to elect, at least two (2) business days prior to the Company shareholder’s meeting, to redeem their shares on the terms and conditions set forth in the Business Combination Agreement and the Company’s governing documents (the “Redemption”). Subject to the receipt of approval from shareholders of the Company, and at least one (1) day prior to the Domestication, the Company will carry out the Redemption. By virtue of the Domestication and subject to the satisfaction or waiver of the conditions of the Business Combination Agreement, including approval of the Company’s shareholders: (i) immediately prior to the Domestication, each of the then issued and outstanding Class B Ordinary Shares of the Company will convert automatically, on a one-for-one basis, into one (1) Class A Ordinary Share, par value of $ 0.0001 per share, of the Company (the “Sponsor Share Conversion”); and (ii) immediately following the Sponsor Share Conversion, in connection with the Domestication, (x) each then issued and outstanding Class A Ordinary Share (other than any Class A Ordinary Share included in the Cayman Purchaser Units (as defined in the Business Combination Agreement)) will convert automatically, on a one-for-one basis, into one (1) share of common stock, par value $ 0.0001 per share, of the Company (after the Domestication) (the “Domesticated Common Stock”); (y) each of the then issued and outstanding warrants (other than any Cayman Purchaser Public Warrants (as defined in the Business Combination Agreement) included in the Cayman Purchaser Units) representing the right to purchase one (1) Class A Ordinary Share will convert automatically into a warrant to acquire one (1) share of Domesticated Common Stock (each a “Domesticated Warrant”); and (z) each of the then issued and outstanding Cayman Purchaser Units will be cancelled and each holder thereof will be entitled to one (1) share of Domesticated Common Stock and one-half (1/2) of one (1) Domesticated Warrant. The Company has also entered into PIPE Subscription Agreements, each dated March 26, 2025, with the PIPE Investors, pursuant to which, among other things, the Company has agreed to issue and sell, in private placements to close immediately prior to or substantially concurrently with the Closing, an aggregate of 5,000,000 shares of Domesticated Common Stock for a purchase price of $ 10.00 per share . The PIPE Investors are permitted, under the PIPE Subscription Agreements, to satisfy their commitments thereunder if they hold shares of Domesticated Common Stock that qualify as Non-Redeemed Shares (as defined in the PIPE Subscription Agreements), subject to certain conditions and restrictions set forth in the PIPE Subscription Agreements. The Company accounts for the Forward Purchase Agreement as a derivative instrument in accordance with the guidance in ASC 815-40. The instrument is subject to re-measurement at each balance sheet date, with changes in fair value recognized in the condensed consolidated statement of operations. The ability of the Company to receive any of the proceeds of the Forward Purchase Agreement is dependent upon the financial metrics of the business combination target, among other factors, rendering the receipt of such proceeds outside the control of the Company. As of September 30, 2025, the fair value of the forward purchase liability was $0 . 18 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) NOTE 7. SHAREHOLDERS’ DEFICIT Preference Shares —The Company is authorized to issue a total of 1,000,000 preference shares at par value of $ 0.0001 each. As of September 30, 2025 and December 31, 2024, there were no preference shares issued or outstanding. Class A Ordinary Shares —The Company is authorized to issue a total of 200,000,000 Class A ordinary shares at par value of $ 0.0001 each. As of September 30, 2025 and December 31, 2024, there were no shares of Class A ordinary shares issued or outstanding, excluding 23,000,000 Class A ordinary shares subject to possible redemption. Class B Ordinary Shares —The Company is authorized to issue a total of 20,000,000 Class B ordinary shares at par value of $ 0.0001 each. On April 8, 2024, the Company issued 5,750,000 Class B ordinary shares to the Sponsor for $ 25,000 , or approximately $ 0.004 per share. As of September 30, 2025 and December 31, 2024, there were 5,750,000 Class B ordinary shares issued and outstanding. The founder shares will automatically convert into Class A ordinary shares concurrently with or immediately following the consummation of the initial Business Combination or earlier at the option of the holder on a one-for-one basis, subject to adjustment for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like, and subject to further adjustment as provided herein. In the case that additional Class A ordinary shares, or any other equity-linked securities, are issued or deemed issued in excess of the amounts sold in this offering and related to or in connection with the closing of the initial Business Combination, the ratio at which Class B ordinary shares convert into Class A ordinary shares will be adjusted (unless the holders of a majority of the outstanding Class B ordinary shares agree to waive such adjustment with respect to any such issuance or deemed issuance) so that the number of Class A ordinary shares issuable upon conversion of all Class B ordinary shares will equal, in the aggregate, 20 % of the sum of (i) the total number of all Class A ordinary shares outstanding upon the completion of this offering (including any Class A ordinary shares issued pursuant to the underwriter’s over-allotment option and excluding the Class A ordinary shares underlying the private placement warrants issued to the Sponsor), plus (ii) all Class A ordinary shares and equity-linked securities issued or deemed issued, in connection with the closing of the initial Business Combination (excluding any shares or equity-linked securities issued, or to be issued, to any seller in the initial Business Combination and any private placement-equivalent warrants issued to the Sponsor or any of its affiliates or to the Company’s officers or directors upon conversion of working capital loans) minus (iii) any redemptions of Class A ordinary shares by public shareholders in connection with an initial Business Combination; provided that such conversion of founder shares will never occur on a less than one-for-one basis. Holders of record of the Company’s Class A ordinary shares and Class B ordinary shares are entitled to one vote for each share held on all matters to be voted on by shareholders. Unless specified in the amended and restated memorandum and articles of association or as required by the Companies Act or stock exchange rules, an ordinary resolution under Cayman Islands law and the amended and restated memorandum and articles of association, which requires the affirmative vote of at least a majority of the votes cast by such shareholders as, being entitled to do so, vote in person or, where proxies are allowed, by proxy at the applicable general meeting of the Company is generally required to approve any matter voted on by shareholders. Approval of certain actions requires a special resolution under Cayman Islands law, which (except as specified below) requires the affirmative vote of at least two-thirds of the votes cast by such shareholders as, being entitled to do so, vote in person or, where proxies are allowed, by proxy at the applicable general meeting, and pursuant to the amended and restated memorandum and articles of association, such actions include amending the amended and restated memorandum and articles of association and approving a statutory merger or consolidation with another the company. There is no cumulative voting with respect to the appointment of directors, meaning, following the initial Business Combination, the holders of more than 50 % of the ordinary shares voted for the appointment of directors can elect all of the directors. Prior to the consummation of the initial Business Combination, only holders of the Class B ordinary shares will (i) have the right to vote on the appointment and removal of directors and (ii) be entitled to vote on continuing the Company in a jurisdiction outside the Cayman Islands (including any special resolution required to amend the constitutional documents or to adopt new constitutional documents, in each case, as a result of the approving a transfer by way of continuation in a jurisdiction outside the Cayman Islands). Holders of the Class A ordinary shares will not be entitled to vote on these matters during such time. These provisions of the amended and restated memorandum and articles of association may only be amended if approved by a special resolution passed by the affirmative vote of at least 90 % (or, where such amendment is proposed in respect of the consummation of the initial Business Combination, two-thirds) of the votes cast by such shareholders as, being entitled to do so, vote in person or, where proxies are allowed, by proxy at the applicable general meeting of the Company. 19 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) NOTE 8. FAIR VALUE MEASUREMENTS The fair value of the Company’s financial assets and liabilities reflects management’s estimate of amounts that the Company would have received in connection with the sale of the assets or paid in connection with the transfer of the liabilities in an orderly transaction between market participants at the measurement date. In connection with measuring the fair value of its assets and liabilities, the Company seeks to maximize the use of observable inputs (market data obtained from independent sources) and to minimize the use of unobservable inputs (internal assumptions about how market participants would price assets and liabilities). The following fair value hierarchy is used to classify assets and liabilities based on the observable inputs and unobservable inputs used in order to value the assets and liabilities: Level 1: Quoted prices in active markets for identical assets or liabilities. An active market for an asset or liability is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2: Observable inputs other than Level 1 inputs. Examples of Level 2 inputs include quoted prices in active markets for similar assets or liabilities and quoted prices for identical assets or liabilities in markets that are not active. Level 3: Unobservable inputs based on assessment of the assumptions that market participants would use in pricing the asset or liability. The following tables present information about the Company’s assets that are measured at fair value on September 30, 2025 and December 31, 2024, and indicate the fair value hierarchy of the valuation inputs the Company utilized to determine such fair value: Fair Value Measured as of September 30, 2025 Level 1 Level 2 Level 3 Total Assets Money market mutual fund held in Trust Account $ 242,642,972 $ — $ — $ 242,642,972 Liabilities: Forward purchase agreement liability $ — $ — $ — $ — Fair Value Measured as of December 31, 2024 Level 1 Level 2 Level 3 Total Assets Money market mutual fund held in Trust Account $ 235,193,585 $ — $ — $ 235,193,585 Forward Purchase Agreement Liability In order to calculate the fair value of the forward purchase agreement derivative liability, the Company utilized the following inputs: March 26, 2025 (Initial measurement) September 30, 2025 Probability of business combination 90 % 99 % Underlying ordinary share price $ 10.80 $ 16.41 Term (years) 0.42 0.08 Risk-free rate 4.28 % 4.20 % Volatility 10.73 % 77.5 % 20 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) The following table presents the changes in the fair value of the forward purchase agreement (“FPA”) derivative liability: FPA Fair value as of March 26, 2025 (initial measurement) $ 893,425 Change in fair value ( 223,693 ) Fair value as of March 31, 2025 669,732 Change in fair value 387,392 Fair value as of June 30, 2025 1,057,124 Change in fair value ( 1,057,124 ) Fair value as of September 30, 2025 $ — The change in the fair value of the forward purchase agreement liability for the nine months ended September 30, 2025 is $ 893,425 . There was no forward purchase agreement liability for the nine months ended September 30, 2024. There were no transfers between fair value levels during the period ended September 30, 2025 and for the year ended December 31, 2024. NOTE 9. SEGMENT INFORMATION ASC Topic 280, “Segment Reporting,” establishes standards for companies to report in their unaudited condensed consolidated financial statement information about operating segments, products, services, geographic areas, and major customers. Operating segments are defined as components of an enterprise that engage in business activities from which it may recognize revenues and incur expenses, and for which separate financial information is available that is regularly evaluated by the Company’s chief operating decision maker (“CODM”), or group, in deciding how to allocate resources and assess performance. The Company’s CODM has been identified as the Chief Financial Officer , who reviews the assets, operating results, and financial metrics for the Company as a whole to make decisions about allocating resources and assessing financial performance. Accordingly, management has determined that there is only one reportable segment. The CODM assesses performance for the single segment and decides how to allocate resources based on net income that also is reported on the condensed consolidated statements of operations as net income or loss. The measure of segment assets is reported on the condensed consolidated balance sheets as total assets. When evaluating the Company’s performance and making key decisions regarding resource allocation, the CODM reviews several key metrics included in net income and total assets, which include the following: September 30, 2025 December 31, 2024 Marketable Securities held in trust account $ 242,642,972 $ 235,193,585 Cash $ 350,389 $ 668,089 For the Three Months Ended September 30, 2025 For the Three Months Ended September 30, 2024 For the Nine Months Ended September 30, 2025 For the Period from April 4, 2024 (Inception) Through September 30, 2025 Net income $ 1,927,839 $ 1,071,221 $ 3,218,865 $ 1,018,558 General and administrative expenses $ 1,638,082 $ 278,494 $ 4,230,522 $ 331,157 Interest earned on marketable securities held in Trust Account $ 2,508,797 $ 1,349,715 $ 7,449,387 $ 1,349,715 21 HCM II ACQUISITION CORP. NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS SEPTEMBER 30, 2025 (Unaudited) The CODM reviews interest earned on the Trust Account to measure and monitor shareholder value and determine the most effective strategy of investment with the Trust Account funds while maintaining compliance with the Trust Agreement. Net income and general and administrative expenses are reviewed and monitored by the CODM to manage and forecast cash to ensure enough capital is available to complete a business combination or similar transaction within the business combination period. The CODM also reviews general and administrative costs to manage, maintain and enforce all contractual agreements to ensure costs are aligned with all agreements and budget. General and administrative costs, as reported on the condensed consolidated statements of operations, are the significant segment expenses provided to the CODM on a regular basis. The accounting policies used to measure the profit and loss of the segment are the same as those described in the summary of significant accounting policies. All other segment items included in net income or loss are reported on the statements of operations and described within their respective disclosures. NOTE 10. SUBSEQUENT EVENTS The Company evaluated subsequent events and transactions that occurred after the condensed consolidated balance sheet date up to the date that the unaudited condensed consolidated financial statements were issued. Based upon this review, other than as described below, the Company did not identify any subsequent events that would have required adjustment or disclosure in the unaudited condensed consolidated financial statements. On October 28, 2025, the Company completed its business combination with Terrestrial Energy Inc. (“Terrestrial Energy”), a developer of advanced nuclear power technology. In connection with the closing, the Company changed its name from HCM II Acquisition Corp. to Terrestrial Energy Inc. and its securities began trading on the Nasdaq Stock Market under the symbols “IMSR” and “IMSRW” on October 29, 2025. The transaction generated gross proceeds exceeding $ 292 million before expenses, including a previously placed $ 50 million PIPE investment and a negligible level of redemptions by public shareholders. The proceeds are expected to support the Company’s ongoing operations and accelerate the commercial deployment of its proprietary Integral Molten Salt Reactor (IMSR) nuclear technology. 22 Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations References in this report (the “Quarterly Report”) to “we,” “us” or the “Company” refer to HCM II Acquisition Corp. References to our “management” or our “management team” refer to our officers and directors, and references to the “Sponsor” refer to HCM Investor Holdings II, LLC. The following discussion and analysis of the Company’s financial condition and results of operations should be read in conjunction with the unaudited condensed consolidated financial statements and the notes thereto contained elsewhere in this Quarterly Report. Certain information contained in the discussion and analysis set forth below includes forward-looking statements that involve risks and uncertainties. Special Note Regarding Forward-Looking Statements This Quarterly Report includes “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Exchange Act that are not historical facts and involve risks and uncertainties that could cause actual results to differ materially from those expected and projected. All statements, other than statements of historical fact included in this Form 10-Q including, without limitation, statements in this “Management’s Discussion and Analysis of Financial Condition and Results of Operations” regarding the completion of the Proposed Business Combination (as defined below), the Company’s financial position, business strategy and the plans and objectives of management for future operations, are forward-looking statements. Words such as “expect,” “believe,” “anticipate,” “intend,” “estimate,” “seek” and variations and similar words and expressions are intended to identify such forward-looking statements. Such forward-looking statements relate to future events or future performance, but reflect management’s current beliefs, based on information currently available. A number of factors could cause actual events, performance or results to differ materially from the events, performance and results discussed in the forward-looking statements, including that the conditions of the Proposed Business Combination are not satisfied. For information identifying important factors that could cause actual results to differ materially from those anticipated in the forward-looking statements, please refer to the Risk Factors section of the Company’s final prospectus for its Initial Public Offering filed with the U.S. Securities and Exchange Commission (the “SEC”). The Company’s securities filings can be accessed on the EDGAR section of the SEC’s website at www.sec.gov. Except as expressly required by applicable securities law, the Company disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise. Overview We are a blank check company incorporated in the Cayman Islands on April 4, 2024 formed for the purpose of effecting a merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization or other similar business combination with one or more businesses. We intend to effectuate our business combination using cash derived from the proceeds of the Initial Public Offering and the sale of the Private Placement Warrants, our shares, debt or a combination of cash, shares and debt. We expect to continue to incur significant costs in the pursuit of our acquisition plans. We cannot assure you that our plans to complete a business combination will be successful. Recent Developments On March 26, 2025, the Company entered into a Business Combination Agreement (as it may be amended, supplemented or otherwise modified from time to time in accordance with its terms, the “Business Combination Agreement”) by and among the Company, Terrestrial Energy Inc., a Delaware corporation (“Terrestrial Energy”), and HCM II Merger Sub Inc., a Delaware corporation and a direct wholly owned subsidiary of Company (“Merger Sub”), pursuant to which, among other things and subject to the terms and conditions contained therein, Merger Sub will merge with and into Terrestrial Energy (the “Merger”), with Terrestrial Energy continuing as the surviving entity (the “Surviving Company”). The transactions contemplated by the Business Combination Agreement are referred to herein as the “Business Combination.” The combined company’s business will continue to operate through Terrestrial Energy and its subsidiaries. Pursuant to the Business Combination Agreement, the aggregate consideration to be paid in the Merger in respect of each Terrestrial Energy Common Share and each Terrestrial Energy Series A Preferred Share that is issued and outstanding immediately prior to the Effective Time (as defined in the Business Combination Agreement), will be a number of shares of Domesticated Common Stock equal to the Exchange Ratio (the “ Per Share Base Consideration ”). The “ Exchange Ratio ” is equal to the number of shares of Domesticated Common Stock equal to the quotient of (i)(a) $925,000,000, divided by (b) the Redemption Price divided by (ii) the Terrestrial Energy Fully Diluted Capital (as defined in the Business Combination Agreement). The Business Combination Agreement and the Business Combination were unanimously approved by the board of directors of the Company and the board of directors of Terrestrial Energy. The Business Combination is expected to close in the fourth quarter of 2025, subject to the receipt of the required approvals by Company’s shareholders and the fulfilment of other customary closing conditions. 23 In addition to the Merger, the Company will, subject to obtaining the required shareholder approvals and at least one (1) day prior to the date of the closing of the Business Combination (the “Closing”), change its jurisdiction of incorporation by deregistering as a Cayman Islands exempted company and continuing and domesticating as a corporation incorporated under the laws of the State of Delaware (the “Domestication”). The Company will provide its public shareholders the opportunity to elect, at least two (2) business days prior to the Company shareholder’s meeting, to redeem their shares on the terms and conditions set forth in the Business Combination Agreement and the Company’s governing documents (the “Redemption”). Subject to the receipt of approval from shareholders of the Company, and at least one (1) day prior to the Domestication, the Company will carry out the Redemption. By virtue of the Domestication and subject to the satisfaction or waiver of the conditions of the Business Combination Agreement, including approval of the Company’s shareholders: (i) immediately prior to the Domestication, each of the then issued and outstanding Class B Ordinary Shares of the Company will convert automatically, on a one-for-one basis, into one (1) Class A Ordinary Share, par value of $0.0001 per share, of the Company (the “Sponsor Share Conversion”); and (ii) immediately following the Sponsor Share Conversion, in connection with the Domestication, (x) each then issued and outstanding Class A Ordinary Share (other than any Class A Ordinary Share included in the Cayman Purchaser Units (as defined in the Business Combination Agreement)) will convert automatically, on a one-for-one basis, into one (1) share of common stock, par value $0.0001 per share, of the Company (after the Domestication) (the “Domesticated Common Stock”); (y) each of the then issued and outstanding warrants (other than any Cayman Purchaser Public Warrants (as defined in the Business Combination Agreement) included in the Cayman Purchaser Units) representing the right to purchase one (1) Class A Ordinary Share will convert automatically into a warrant to acquire one (1) share of Domesticated Common Stock (each a “Domesticated Warrant”); and (z) each of the then issued and outstanding Cayman Purchaser Units will be cancelled and each holder thereof will be entitled to one (1) share of Domesticated Common Stock and one-half (1/2) of one (1) Domesticated Warrant. The Company has also entered into subscription agreements (collectively, the “PIPE Subscription Agreements”), each dated as of March 26, 2025, with certain investors (collectively, the “PIPE Investors”), pursuant to which, among other things, the Company has agreed to issue and sell, in private placements to close immediately prior to or substantially concurrently with the Closing, an aggregate of 5,000,000 shares of Domesticated Common Stock for a purchase price of $10.00 per share (the “PIPE Financing”). The PIPE Investors are permitted, under the PIPE Subscription Agreements, to satisfy their commitments thereunder if they hold shares of Domesticated Common Stock that qualify as Non-Redeemed Shares (as defined in the PIPE Subscription Agreements), subject to certain conditions and restrictions set forth in the PIPE Subscription Agreements. Results of Operations We have neither engaged in any operations nor generated any revenues to date. Our only activities from April 4, 2024 (inception) through September 30, 2025 were organizational activities, those necessary to prepare for the Initial Public Offering, described below, and, after our Initial Public Offering, identifying a target company for a business combination. We do not expect to generate any operating revenues until after the completion of our business combination. We generate non-operating income in the form of interest income on marketable securities held in the trust account. We incur expenses as a result of being a public company (for legal, financial reporting, accounting and auditing compliance), as well as for due diligence expenses. For the three months ended September 30, 2025, we had net income of $1,927,839 which consists of interest earned on marketable securities held in the trust account of $2,508,797, offset by operating costs of $1,638,082. For the nine months ended September 30, 2025, we had net income of $3,218,865 which consists of interest earned on marketable securities held in the trust account of $7,449,387, offset by operating costs of $4,230,522, initial loss on FPA Liability of $893,425 and change in fair value of FPA Liability of $893,425. For the three months ended September 30, 2024, we had net income of $1,071,221 which consists of interest earned on marketable securities held in the trust account of $1,349,715, offset by operating costs of $278,494. For the period from April 4, 2024 (inception) through September 30, 2024, we had net income of $1,018,558 which consists of interest earned on cash and marketable securities held in the trust account of $1,349,715, offset by operating costs of $331,157. Factors That May Adversely Affect our Results of Operations Our results of operations and our ability to complete an initial business combination may be adversely affected by various factors that could cause economic uncertainty and volatility in the financial markets, many of which are beyond our control. Our business could be impacted by, among other things, downturns in the financial markets or in economic conditions, increases in oil prices, inflation, increases in interest rates, supply chain disruptions, declines in consumer confidence and spending, public health considerations, and geopolitical instability, such as the military conflicts in Ukraine and the Middle East. We cannot at this time predict the likelihood of one or more of the above events, their duration or magnitude or the extent to which they may negatively impact our business and our ability to complete an initial business combination. 24 Liquidity and Capital Resources Until the consummation of the Initial Public Offering, our only source of liquidity was an initial purchase of shares of Class B Ordinary Shares, par value $0.0001 per share, by the Sponsor and loans from the Sponsor. On August 19, 2024, we consummated the Initial Public Offering of 23,000,000 Units, which includes the full exercise by the underwriters of their over-allotment option in the amount of 3,000,000 Units generating gross proceeds of $230,000,000. Simultaneously with the closing of the Initial Public Offering, we consummated the sale of an aggregate of 6,850,000 Private Placement Warrants at a price of $1.00 per Private Placement Warrant, in a private placement to the Sponsor and Cantor Fitzgerald & Co., generating gross proceeds of $6,850,000. We intend to use substantially all of the funds held in the Trust Account, including any amounts representing interest earned on the Trust Account (less income taxes payable), to complete our Business Combination. To the extent that our share capital or debt is used, in whole or in part, as consideration to complete our Business Combination, the remaining proceeds held in the Trust Account will be used as working capital to finance the operations of the target business or businesses, make other acquisitions and pursue our growth strategies. We intend to use the funds held outside the Trust Account primarily to identify and evaluate target businesses, perform business due diligence on prospective target businesses, travel to and from the offices, plants or similar locations of prospective target businesses or their representatives or owners, review corporate documents and material agreements of prospective target businesses, and structure, negotiate and complete a Business Combination. For the nine months ended September 30, 2025, cash used in operating activities was $1,055,702. Net income of $3,218,865 was affected by interest earned on marketable securities held in the trust account of $7,449,387, initial loss on FPA Liability of $893,425 and change in fair value of FPA Liability of $893,425. Changes in operating assets and liabilities used $3,174,820 of cash for operating activities. For the period from April 4, 2024 (inception) through September 30, 2024, cash used in operating activities was $294,130. Net income of $1,018,558 was affected by operating costs paid by Sponsor in exchange for issuance of Class B founder shares of $12,463, payment of operation costs through promissory note of $45,200 and interest earned on marketable securities held in the trust account of $1,349,715. Changes in operating assets and liabilities was affected by $20,636 of cash provided for operating activities. As of September 30, 2025, we had marketable securities held in the trust account of $242,642,972. We intend to use substantially all of the funds held in the Trust Account, including any amounts representing interest earned on the Trust Account (less income taxes payable), to complete our Business Combination. To the extent that our share capital or debt is used, in whole or in part, as consideration to complete our Business Combination, the remaining proceeds held in the Trust Account will be used as working capital to finance the operations of the target business or businesses, make other acquisitions and pursue our growth strategies. As of September 30, 2025, we had cash held outside of the trust account of $350,389 available for working capital needs. We intend to use the funds held outside the Trust Account primarily to identify and evaluate target businesses, perform business due diligence on prospective target businesses, travel to and from the offices, plants or similar locations of prospective target businesses or their representatives or owners, review corporate documents and material agreements of prospective target businesses, and structure, negotiate and complete a Business Combination. We have until August 19, 2026 to consummate the initial Business Combination (assume no extensions). If we do not complete a Business Combination, we will trigger an automatic winding up, dissolution and liquidation pursuant to the terms of the Amended and Restated Memorandum and Articles of Association. Notwithstanding management’s belief that we would have sufficient funds to execute its business strategy, there is a possibility that business combination might not happen within the 24-month period from the date of the Initial Public Offering. 25 In connection with our assessment of going concern considerations in accordance with ASC 205-40, Going Concern, as of September 30, 2025, we may need to raise additional capital through loans or additional investments from Sponsor, shareholders, officers, directors, or third parties. Our officers, directors and Sponsor may, but are not obligated to, loan us funds, from time to time or at any time, in whatever amount they deem reasonable in their sole discretion, to meet our working capital needs. Accordingly, we may not be able to obtain additional financing. If we are unable to raise additional capital, it may be required to take additional measures to conserve liquidity, which could include, but not necessarily be limited to, curtailing operations, suspending the pursuit of a potential transaction, and reducing overhead expenses. We cannot provide any assurance that new financing will be available to it on commercially acceptable terms, if at all. Management plans to address this uncertainty through a Business Combination. If a Business Combination is not consummated by the end of the Combination Period, currently August 19, 2026, there will be mandatory liquidation and subsequent dissolution of the Company. Management has determined that the liquidity condition raises substantial doubt about our ability to continue as a going concern. No adjustments have been made to the carrying amounts of assets or liabilities should be required to liquidate after the Combination Period. We intend to complete the initial Business Combination before the end of the Combination Period. However, there can be no assurance that we will be able to consummate any Business Combination by the end of the Combination Period. Forward Purchase Agreement Liability On March 26, 2025, we entered into a Forward Purchase Agreement. We account for the Forward Purchase Agreement as a derivative instrument in accordance with the guidance in ASC 815-40. The instrument is subject to re-measurement at each balance sheet date, with changes in fair value recognized in the condensed statements of operations. The ability of us to receive any of the proceeds of the Forward Purchase Agreement is dependent upon the financial metrics of the business combination target, among other factors, rendering the receipt of such proceeds outside the control of us. As of September 30, 2025, the fair value of the forward purchase derivative liability was $0. Off-Balance Sheet Financing Arrangements We have no obligations, assets or liabilities, which would be considered off-balance sheet arrangements as of September 30, 2025. We do not participate in transactions that create relationships with unconsolidated entities or financial partnerships, often referred to as variable interest entities, which would have been established for the purpose of facilitating off-balance sheet arrangements. We have not entered into any off-balance sheet financing arrangements, established any special purpose entities, guaranteed any debt or commitments of other entities, or purchased any non-financial assets. 26 Contractual Obligations We do not have any long-term debt, capital lease obligations, operating lease obligations or long-term liabilities, other than an agreement to pay the Sponsor a total of $15,000 per month for office space, utilities and secretarial and administrative support services. The underwriter will be entitled to a deferred underwriting discount of 4.40% of the gross proceeds of the Initial Public Offering held in the Trust Account other than those sold pursuant to the underwriters’ over-allotment option and 6.40% of the gross proceeds sold pursuant to the underwriter’s over-allotment option, $10,720,000 in the aggregate, payable upon the completion of the Company’s initial Business Combination subject to the terms of the underwriting agreement Critical Accounting Estimates The preparation of unaudited condensed consolidated financial statement and related disclosures in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statement, and income and expenses during the periods reported. Making estimates requires management to exercise significant judgement. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the unaudited condensed consolidated financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could materially differ from those estimates. As of September 30, 2025, we did not have any critical accounting estimates to be disclosed. Recent Accounting Pronouncements Management does not believe that any recently issued, but not effective, accounting standards, if currently adopted, would have a material effect on the Company’s unaudited condensed consolidated financial statement. 27 Item 3. Quantitative and Qualitative Disclosures About Market Risk We are a smaller reporting company as defined by Rule 12b-2 of the Exchange Act and are not required to provide the information otherwise required under this Item. Item 4. Controls and Procedures. Evaluation of Disclosure Controls and Procedures Disclosure controls and procedures are controls and other procedures designed to ensure that information required to be disclosed in our reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed in our reports filed or submitted under the Exchange Act is accumulated and communicated to Management, including our Chief Executive Officer and Chief Financial Officer (together, the “Certifying Officers”), or persons performing similar functions, as appropriate, to allow timely decisions regarding required disclosure. Under the supervision and with the participation of our management, including our principal executive officer and principal financial and accounting officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting as of September 30, 2025, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the Company’s annual or interim financial statements will not be prevented or detected on a timely basis. Based upon the evaluation, our principal executive officer and principal financial and accounting officer, concluded that our internal controls over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) were not effective as of September 30, 2025. Our internal controls did not detect an incorrect statement on the Quarterly Report on Form 10-Q for the three months ended March 31, 2025 footnote disclosure under Part I, Item 1 and management concludes that this is a material weakness. We do not expect that our disclosure controls and procedures will prevent all errors and all instances of fraud. Disclosure controls and procedures, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the disclosure controls and procedures are met. Further, the design of disclosure controls and procedures must reflect the fact that there are resource constraints, and the benefits must be considered relative to their costs. Because of the inherent limitations in all disclosure controls and procedures, no evaluation of disclosure controls and procedures can provide absolute assurance that we have detected all our control deficiencies and instances of fraud, if any. The design of disclosure controls and procedures also is based partly on certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Changes in Internal Control over Financial Reporting There was no change in our internal control over financial reporting that occurred during the fiscal quarter of 2025 covered by this Quarterly Report on Form 10-Q that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting. 28 PART II - OTHER INFORMATION Item 1. Legal Proceedings From time to time, we may be subject to various claims, lawsuits and other legal and administrative proceedings that may arise in the ordinary course of business. Some of these claims, lawsuits and other proceedings may range in complexity and result in substantial uncertainty; it is possible that they may result in damages, fines, penalties, non-monetary sanctions, or relief. We are currently not a party to any material pending legal proceeding other than ordinary routine litigation incidental to our business. Item 1A. Risk Factors Factors that could cause our actual results to differ materially from those in this report include the risk factors described in our filings with the SEC, including the Proxy Statement. Additional risk factors not presently known to us or that we currently deem immaterial may also impair our business or results of operations. We may disclose changes to such factors or disclose additional factors from time to time in our future filings with the SEC. Item 2. Unregistered Sales of Equity Securities and Use of Proceeds. As previously reported, the Company issued 5,000,000 shares of Common Stock in connection with the closing of the Business Combination on October 28, 2025 to certain investors pursuant to the PIPE Subscription Agreements dated as of March 26, 2025 and reported in the Company’s Form 8-K dated March 26, 2025. The securities issued in connection with the PIPE Subscription Agreements were offered and sold in reliance on the exemption from registration provided by Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”), and/or Regulation D promulgated thereunder. As previously reported, Working Capital Loans in the amount of $1,267,599 made to HCM II by the Sponsor or its affiliates were converted into 1,267,599 warrants without registration under the Securities Act in reliance on Section 4(a)(2) of the Securities Act and/or Regulation D promulgated thereunder, and/or as an exempt exchange under Section 3(a)(9) of the Securities Act. Item 3. Defaults Upon Senior Securities None Item 4. Mine Safety Disclosures Not applicable. Item 5. Other Information None Item 6. Exhibits The following exhibits are filed as part of, or incorporated by reference into, this Quarterly Report on Form 10-Q. No. Description of Exhibit 2.1† Business Combination Agreement, dated as of March 26, 2025, by and among HCM II Acquisition Corp., HCM II Merger Sub Inc., and Terrestrial Energy Inc. (incorporated by reference herein to Exhibit 2.1 filed with the Registration Statement on Form S-4/A (Reg. No. 333-283181) filed by the registrant on September 23, 2025). 2.2 Amendment No. 1 to Business Combination Agreement, effective as of October 26, 2025, by and among HCM II Acquisition Corp., HCM II Merger Sub Inc., and Terrestrial Energy Inc. (incorporated by reference herein to Exhibit 2.2 filed on Form 8-K filed by the registrant on November 3, 2025). 2.3 Certificate of Merger of HCM II Merger Sub Inc. with and into Terrestrial Energy Inc. (incorporated by reference herein to Exhibit 2.3 filed on Form 8-K filed by the registrant on November 3, 2025). 2.4 Plan of Domestication (incorporated by reference herein to Exhibit 2.4 filed on Form 8-K filed by the registrant on November 3, 2025). 3.1 Certificate of Corporate Domestication of HCM II Acquisition Corp. (incorporated by reference herein to Exhibit 3.1 filed on Form 8-K filed by the registrant on November 3, 2025). 3.2 Certificate of Incorporation of Terrestrial Energy Inc. (incorporated by reference herein to Exhibit 3.2 filed on Form 8-K filed by the registrant on November 3, 2025). 3.3 Bylaws of Terrestrial Energy Inc. (incorporated by reference herein to Exhibit 3.3 filed on Form 8-K filed by the registrant on November 3, 2025). 3.4 First Amendment to Bylaws of Terrestrial Energy Inc. (incorporated by reference herein to Exhibit 3.4 filed on Form 8-K filed by the registrant on November 3, 2025). 29 4.1 Specimen Common Stock Certificate of Terrestrial Energy Inc. (incorporated by reference herein to Exhibit 4.5 filed with the Registration Statement on Form S-4/A (Reg. No. 333-288735) filed by the registrant on September 23, 2025). 4.2 Specimen Warrant Certificate of Terrestrial Energy Inc. (included as an exhibit to Exhibit 10.1). 10.1 Amended and Restated Warrant Agreement, dated October 28, 2025, by and between HCM II Acquisition Corp. and Continental Stock Transfer & Trust Company, as warrant agent. (incorporated by reference herein to Exhibit 10.1 filed on Form 8-K filed by the registrant on November 3, 2025). 10.2 Assignment and Assumption Agreement dated October 28, 2025 by and between Terrestrial Energy Inc. and HCM II Acquisition Corp. (incorporated by reference herein to Exhibit 10.2 filed on Form 8-K filed by the registrant on November 3, 2025). 10.3 Amended and Restated Registration Rights Agreement, dated as of October 28, 2025, by and among Terrestrial Energy Inc., Cantor Fitzgerald & Co. and HCM Investor Holdings II, LLC. (incorporated by reference herein to Exhibit 10.3 filed on Form 8-K filed by the registrant on November 3, 2025). 10.4 Sponsor Support Agreement, by and among HCM II Acquisition Corp., HCM Investor Holdings II, LLC, and the other parties thereto (incorporated by reference herein to Exhibit 10.2 filed with the Registration Statement on Form S-4/A (Reg. No. 333-288735) filed by the registrant on September 23, 2025). 10.5 Sponsor Lock-Up Agreement, dated as of October 28, 2025, by and among Terrestrial Energy Inc. and HCM Investor Holdings II, LLC. (incorporated by reference herein to Exhibit 10.5 filed on Form 8-K filed by the registrant on November 3, 2025). 10.6 Form of Key Holders Lock-Up Agreement, dated October 27, 2025, by and among HCM II Acquisition Corp. and the other parties thereto (incorporated by reference herein to Exhibit 10.7 filed with the Registration Statement on Form S-4/A (Reg. No. 333-288735) filed by the registrant on September 23, 2025). 10.7 Second Amended and Restated Exchange and Support Agreement dated October 28, 2025, by and among HCM Acquisition Corp., Terrestrial Energy Canada (Call) Inc., and Terrestrial Energy Canada (Exchange) Inc. (incorporated by reference herein to Exhibit 10.7 filed on Form 8-K filed by the registrant on November 3, 2025). 10.8 Form of PIPE Subscription Agreement (incorporated by reference herein to Exhibit 4.8 filed with the Registration Statement on Form S-4/A (Reg. No. 333-288735) filed by the registrant on September 23, 2025). 10.9+ Terrestrial Energy Inc. 2025 Equity Incentive Plan, dated as of October 28, 2025. (incorporated by reference herein to Exhibit 10.9 filed on Form 8-K filed by the registrant on November 3, 2025). 10.10+ Employment Agreement, dated as of October 28, 2025, by and between Simon Irish and New Terrestrial Energy Inc. (incorporated by reference herein to Exhibit 10.10 filed on Form 8-K filed by the registrant on November 3, 2025). 10.11+ Form of Indemnification Agreement between New Terrestrial Energy and each of its directors and executive officers. (incorporated by reference herein to Exhibit 10.11 filed on Form 8-K filed by the registrant on November 3, 2025). 10.12 Form of assumed Warrant Agreement of Terrestrial Energy Development Inc. (incorporated by reference herein to Exhibit 10.12 filed on Form 8-K filed by the registrant on November 3, 2025). 31.1* Certification of Principal Executive Officer Pursuant to Securities Exchange Act Rules 13a-14(a), as adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 31.2* Certification of Principal Financial Officer Pursuant to Securities Exchange Act Rules 13a-14(a), as adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 32.1** Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 32.2** Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 101.INS Inline XBRL Instance Document 101.SCH Inline XBRL Taxonomy Extension Schema Document. 101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase Document. 101.DEF Inline XBRL Taxonomy Extension Definition Linkbase Document. 101.LAB Inline XBRL Taxonomy Extension Label Linkbase Document. 101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document. 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101). * Filed herewith ** Furnished herewith + Indicates a management contract or compensatory plan, contract or arrangement. † Certain of the schedules and exhibits to this Exhibit have been omitted pursuant to Item 601(a)(5) of Regulation S-K. The Company agrees to furnish supplementally a copy of such omitted materials to the SEC upon request. 30 PART III - SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Amendment No. 1 to be signed on its behalf by the undersigned, thereunto duly authorized. TERRESTRIAL ENERGY INC. f/k/a HCM II ACQUISITION CORP. Date: November 14, 2025 By: /s/ Simon Irish Simon Irish Chief Executive Officer (Principal Executive Officer) Date: November 14, 2025 By: /s/ Brian Thrasher Brian Thrasher Chief Financial Officer (Principal Financial Officer) 31