Description of Organization and Business Operations	12 Months Ended
Description of Organization and Business Operations	Dec. 31, 2025
Business Description And Basis Of Presentation [Abstract]
Description of organization and business operations	Note 1 — Description of Organization and Business Operations Organization and General Churchill Capital Corp IX (the “Company”) was incorporated as a Cayman Islands exempted company on December 18, 2023. 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”) that the Company, as of its incorporation, had not yet identified. The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act of 1933, as amended (the “Securities Act”), as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). The Company has two direct wholly-owned subsidiaries, AL Merger Sub I, Inc. (“Merger Sub I”), a Delaware corporation, and AL Merger Sub II, LLC, a Delaware limited liability company (“Merger Sub II”, and collectively with Merger Sub I, the “Merger Subs”). The Merger Subs were formed on June 2, 2025, for the sole purpose of effecting the PlusAI Business Combination (as defined below). As of December 31 , 2025 , the Company had not yet commenced operations. All activity for the period from December 18 , 2023 (inception) through December 31 , 2025 relates to (i) the Company’s formation and the Initial Public Offering (as defined below), and (ii) subsequent to the Initial Public Offering, identifying a target company for an initial Business Combination and activities in connection with attempting to complete the PlusAI Business Combination. 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. Sponsor and Initial Public Offering The Company’s sponsor is Churchill Sponsor IX LLC (the “Sponsor”), an affiliate of M. Klein and Company, LLC. The registration statement for the Initial Public Offering was declared effective on May 1, 2024 (the “IPO Registration Statement”). On May 6, 2024, the Company consummated the initial public offering of 28,750,000 units (the “Units” and, with respect to the shares of Class A ordinary shares included in the Units offered, the “Public Shares”), which includes the full exercise by the underwriters of their over-allotment option in the amount of 3,750,000 Units, at $10.00 per Unit, generating gross proceeds of $287,500,000, which is discussed in Note 3 (the “Initial Public Offering”). Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of 725,000 private placement units (the “Private Placement Units”) to the Sponsor at a price of $10.00 per Unit, or $7,250,000 in the aggregate, which is described in Note 4 (the “Private Placement”). Transaction costs amounted to $14,560,986, consisting of $5,750,000 of upfront discount to the underwriters, $10,062,500 of deferred underwriting fees, and $557,236 of other offering costs, offset by a reimbursement from the underwriters of $1,808,750. The Trust Account Following the closing of the Initial Public Offering, on May 6, 2024, an amount of $287,500,000 ($10.00 per Unit) from the net proceeds of the sale of the Units in the Initial Public Offering and the sale of the Private Placement Units in the Private Placement was placed in the trust account (the “Trust Account”). The proceeds held in the Trust Account are invested only in U.S. government treasury bills with a maturity of one hundred eighty-five (185) days or less or in money market funds that meet certain conditions under Rule 2a-7under the Investment Company Act of 1940 (the “Investment Company Act”) and that invest only in direct U.S. government obligations and may at any time be held as cash or cash items, including in demand deposit accounts at a bank. Funds will remain in the Trust Account until the earlier of (i) the consummation of the initial Business Combination or (ii) the distribution of the Trust Account proceeds as described below. The remaining proceeds outside the Trust Account may be used to pay for business, legal and accounting due diligence on prospective acquisitions and continuing general and administrative expenses. The Company’s amended and restated memorandum and articles of association provide that, other than the permitted withdrawals (as defined below), if any, none of the funds held in the Trust Account will be released until the earlier of (i) the completion of the initial Business Combination; (ii) the redemption of any Public Shares that have been properly submitted in connection with a shareholder vote to approve an amendment to the Company’s amended and restated memorandum and articles of association (A) in a manner that would affect the substance or timing of its obligation to redeem 100% of the Public Shares if it does not complete an initial Business Combination within 24 months from the closing of the Initial Public Offering (or 27 months from the closing of the Initial Public Offering if the Company has executed a letter of intent, agreement in principle or definitive agreement for an initial Business Combination within 24 months from the closing of the Initial Public Offering) (such 24 or 27 month period, as may be amended, the “Combination Period”) or (B) with respect to any other provision relating to the rights of holders of the Public Shares or pre-initial Business Combination activity; and (iii) the redemption of 100% of the Public Shares if the Company is unable to complete an initial Business Combination within the Combination Period. 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. As of December 31, 2025, the Company has entered into the PlusAI Merger Agreement (as defined below), as such the Company currently has until August 6, 2026 to complete its initial Business Combination. Initial Business Combination The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering, although substantially all of the net proceeds of the Initial Public Offering are intended to be generally applied toward consummating an initial Business Combination. The initial Business Combination must occur with one or more target businesses that together have an aggregate fair market value of at least 80% of the assets held in the Trust Account (excluding the deferred underwriting commissions and taxes payable on income earned on the Trust Account) at the time of the agreement to enter into the initial Business Combination. Furthermore, there is no assurance that the Company will be able to successfully effect an initial Business Combination. The Company, after signing a definitive agreement for an initial Business Combination, will either (i) seek shareholder approval of the initial Business Combination at a meeting called for such purpose in connection with which shareholders may seek to redeem their shares, regardless of whether they vote for or against the initial Business Combination, for cash equal to their pro rata share of the aggregate amount then on deposit in the Trust Account 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 (net of amounts withdrawn to fund the working capital requirements, subject to an annual limit of $1,000,000, and to pay taxes (“permitted withdrawals”)), or (ii) provide shareholders with the opportunity to sell their Public Shares to the Company by means of a tender offer (and thereby avoid the need for a shareholder vote) for an amount in cash equal to their pro rata share of the aggregate amount then on deposit in the Trust Account as of two business days prior to the consummation of the initial Business Combination, including interest less permitted withdrawals. The decision as to whether the Company will seek shareholder approval of the initial Business Combination or will allow shareholders to sell their Public Shares in a tender offer will be made by the Company, solely in its discretion, and will be based on a variety of factors such as the timing of the transaction and whether the terms of the transaction would otherwise require the Company to seek shareholder approval, unless a vote is required by law or under Nasdaq rules. Pursuant to the Company’s amended and restated memorandum and articles of association if the Company is unable to complete the initial Business Combination within the Combination Period, the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but no more than ten business days thereafter, subject to lawfully available funds therefor, 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 (which interest shall be net of permitted withdrawals and up to $100,000 of interest to pay dissolution expenses and net of taxes payable), divided by the number of then outstanding Public Shares, which redemption will completely extinguish the holders’ rights as shareholders (including the right to receive further liquidating distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the Company’s remaining shareholders and the Company’s board of directors (the “Board”), dissolve and liquidate, subject in each case to the Company’s obligations under Cayman Islands law to provide for claims of creditors and the requirements of other applicable law. The Sponsor, officers and directors are not entitled to rights to liquidating distributions from the Trust Account with respect to any Founder Shares (as defined below) held by them if the Company fails to complete the initial Business Combination within the Combination Period. However, if the Sponsor and management team acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such shares if the Company fails to complete the initial Business Combination within the prescribed time period. In the event of a liquidation, dissolution or winding up of the Company after an initial Business Combination, the Company’s shareholders are entitled to share ratably in all assets remaining available for distribution after payment of liabilities and after provision is made for each class of shares, if any, having preference over the ordinary shares. The Company’s shareholders have no preemptive or other subscription rights. There are no sinking fund provisions applicable to the ordinary shares, except that the Company will provide its shareholders with the opportunity to redeem their Public Shares for cash equal to their pro rata share of the aggregate amount then on deposit in the Trust Account, upon the completion of the initial Business Combination, subject to the limitations described herein. PlusAI Business Combination On June 5, 2025, the Company entered into an Agreement and Plan of Merger and Reorganization (as amended by Amendment No. 1 (as defined below) and Amendment No. 2 (as defined below) and as may be further amended, modified, supplemented or waived from time to time, the “PlusAI Merger Agreement”) by and among the Company, Merger Sub I, Merger Sub II and Plus Automation, Inc., a Delaware corporation (“PlusAI”). Pursuant to the PlusAI Merger Agreement, and on the terms and subject to the satisfaction or waiver of the conditions set forth therein, the parties thereto intend to effect a Business Combination transaction by which (i) Merger Sub I will merge with and into PlusAI, with PlusAI continuing as the surviving corporation and a wholly owned subsidiary of the Company (“First Merger”), and (ii) immediately following the First Merger, the surviving corporation of the First Merger will merge with and into Merger Sub II, with Merger Sub II continuing as the surviving entity (the “Second Merger” and, together with the First Merger, the “Mergers”). The proposed Mergers are expected to be consummated following the receipt of the required approval by the shareholders of the Company and PlusAI and the satisfaction or waiver of certain other closing conditions set forth in the PlusAI Merger Agreement. The transactions contemplated by the PlusAI Merger Agreement, including the Mergers, will be referred to as the “PlusAI Business Combination.” On September 8 , 2025 , the Company, Merger Sub I, Merger Sub II and PlusAI entered into Amendment No. 1 to the PlusAI Merger Agreement (“Amendment No. 1 ”) to clarify that shares of PlusAI common stock issued as a result of the exercise of PlusAI options issued pursuant to a certain PlusAI compensation plan will be exchanged, at the effective time of the Mergers, for the right to receive shares of Class B common stock equal to the Exchange Ratio (as defined in the PlusAI Merger Agreement) of the Post-Closing Company. On September 18, 2025, the Company, Merger Sub I, Merger Sub II and PlusAI entered into Amendment No. 2 to the PlusAI Merger Agreement (“Amendment No. 2”) to remove the closing condition that the Company must have $100 million in Available Closing SPAC Cash (as defined in the PlusAI Merger Agreement). Risks and Uncertainties The Company’s ability to complete an initial Business Combination may be adversely affected by various factors, many of which are beyond the Company’s control. The Company’s ability to consummate an initial Business Combination could be impacted by, among other things, changes in laws or regulations, downturns in the financial markets or in economic conditions, inflation, fluctuations in interest rates, increases in tariffs, 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. The Company 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 the Company’s ability to complete an initial Business Combination. Liquidity, Capital Resources and Going Concern As of December 31, 2025, the Company had $2,469 of cash and a working capital deficit of $11,266. In order to finance working capital deficit or to finance transaction costs in connection with an intended initial 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 (“Working Capital Loans”). If the Company completes its initial Business Combination, the Company would repay the Working Capital Loans. In the event that the initial 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. If the Sponsor makes any Working Capital Loans, up to $1,500,000 of the Working Capital Loans may be convertible into units of the post Business Combination entity at a price of $10.00 per unit at the option of the lender. The units and the underlying securities would be identical to the Private Placement Units (See Note 5). Additionally, to fund working capital, the Company has permitted withdrawals available up to an annual limit of $1,000,000. These permitted withdrawals are limited to only the interest available that has been earned in excess of the initial deposit at the Initial Public Offering. During the year ended December 31, 2024, the Company had withdrawn $1,000,000 in interest for working capital purposes and had no further amounts available for permitted withdrawals until May 6, 2025, which was the one-year anniversary of the Initial Public Offering. For the year ended December 31, 2025, the Company withdrew another $1,000,000 in interest from the Trust Account for working capital purposes and has no further amounts available for permitted withdrawals until May 6, 2026, which is the two-year anniversary of the Initial Public Offering. In connection with the Company’s assessment of going concern considerations in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standard s Codification (“ASC”) Topic 205-40, “Going Concern,” as of December 31, 2025, the Company does not believe it will have sufficient funds for the working capital needs of the Company until a minimum of one year from the date of the accompanying consolidated financial statements. Moreover, the Company will need to obtain additional financing either to complete its Business Combination, including the PlusAI Business Combination, or because the Company becomes obligated to redeem a significant number of Public Shares upon completion of the Business Combination, in which case the Company may issue additional securities or incur debt in connection with such Business Combination. Accordingly, the Company may not be able to obtain additional financing. If the Company is 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. The Company cannot provide any assurance that new financing will be available to it on commercially acceptable terms, if at all. The Company’s liquidity condition and mandatory liquidation in the event the Company does not complete a Business Combination within the Combination Period raise substantial doubt about the Company’s ability to continue as a going concern for a period of time within one year from the date of the accompanying consolidated financial statements. Management plans to address this uncertainty by completing a Business Combination. If a Business Combination is not consummated by the end of the Combination Period, currently August 6, 2026, there will be a mandatory liquidation and subsequent dissolution of the Company, which raises substantial doubt about the Company’s ability to continue as a going concern. No adjustments have been made to the carrying amounts of assets or liabilities should the Company be required to liquidate after the Combination Period. The Company intends to complete the initial Business Combination before the end of the Combination Period. However, there can be no assurance that the Company will be able to consummate any Business Combination by the end of Combination Period.

Churchill Capital Corp IX/Cayman 10-K