Churchill Capital Corp XI

As filed with the United States Securities and Exchange Commission on November 18, 2025.

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORMS-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

(Exact Name of Registrant as Specified in its Charter)

640 Fifth Avenue, 14 th Floor

New York, NY 10019

Telephone: (212) 380-7500

(Address, including Zip Code, and Telephone Number, including Area Code, of Registrant’s Principal Executive Offices)

Jay Taragin

c/o Churchill Capital Corp XI

640 Fifth Avenue, 14 th Floor

New York, NY 10019

Telephone: (212) 380-7500

(Name, Address, including Zip Code, and Telephone Number, including Area Code, of Agent for Service)

Copies to:

Approximate date of commencement of proposed sale to the public: As soon as practicable after the effective date of this registration statement.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box.☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.☐

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.☐

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.

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 7(a)(2)(B) of the Securities Act.☐

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until the registration statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

The information contained in this preliminary prospectus is not complete and may be changed. No securities may be sold until the registration statement filed with the Securities and Exchange Commission is effective. This preliminary prospectus is not an offer to sell these securities, and it is not soliciting an offer to buy these securities, in any jurisdiction where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED NOVEMBER 18, 2025

P R E L I M I N A R Y P R O S P E C T U S

$300,000,000

30,000,000 Units

Churchill Capital Corp XI is a blank check company incorporated as a Cayman Islands exempted company for the purpose of effecting a merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses, which we refer to throughout this prospectus as our initial business combination. We have not selected any business combination target and we have not, nor has anyone on our behalf, initiated any substantive discussions, directly or indirectly, with any business combination target. We may pursue an initial business combination target in any business or industry.

This is an initial public offering of our securities. Each unit has an offering price of $10.00 and consists of one Class A ordinary share and one-tenth of one warrant. Each whole warrant entitles the holder thereof to purchase one Class A ordinary share at a price of $11.50 per share, subject to adjustment as described in this prospectus, and only whole warrants are exercisable. The warrants will become exercisable 30 days after the completion of our initial business combination, and will expire five years after the completion of our initial business combination or earlier upon redemption or liquidation, as described in this prospectus. Subject to the terms and conditions described in this prospectus, we may redeem the warrants for cash once the warrants become exercisable. No fractional warrants will be issued upon separation of the units and only whole warrants will trade. We have also granted the underwriter a 45-day option to purchase up to an additional 4,500,000 units to cover over-allotments, if any.

We will provide our public shareholders with the opportunity to redeem all or a portion of their Class A ordinary shares upon the completion of our initial business combination at a per-share price described herein, payable in cash, equal to the aggregate amount then on deposit in the trust account described below as of two business days prior to the consummation of our initial business combination, including interest earned on the funds held in the trust account (net of amounts withdrawn to fund our working capital requirements, subject to an annual limit of $1,000,000, and to pay our taxes (“permitted withdrawals”)), divided by the number of then outstanding Class A ordinary shares that were sold as part of the units in this offering. We will have 24 months from the closing of this offering to consummate an initial business combination (or 27 months from the closing of this offering if we have executed a letter of intent, agreement in principle or definitive agreement for an initial business combination within 24 months from the closing of this offering; no redemption rights shall be offered to our public shareholders in connection with any such extension from 24 months to 27 months if we have executed a letter of intent, agreement in principle or definitive agreement for an initial business combination within 24 months from the closing of this offering) or until such earlier liquidation date as our board of directors may approve, to consummate an initial business combination, which we refer to herein as the completion window. If we anticipate that we may be unable to consummate our initial business combination within such 24-month period (or up to 27 months if we extend the period of time to consummate our initial business combination in accordance with the terms described in this prospectus), we may seek shareholder approval to amend our amended and restated memorandum and articles of association to extend the date by which we must consummate our initial business combination. If we seek shareholder approval for an extension, holders of public shares will be offered an opportunity to redeem their shares at a per share price, payable in cash, equal to the aggregate amount then on deposit in the trust account, including interest earned thereon (less permitted withdrawals), divided by the number of then issued and outstanding public shares, subject to applicable law. If we are unable to complete our initial business combination within the completion window (or such later date as approved by our shareholders), or by such earlier liquidation date as our board of directors may approve, we will redeem 100% of 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 thereon (less permitted withdrawals and up to $100,000 of interest income to pay dissolution expenses), divided by the number of then issued and outstanding public shares, subject to applicable law and certain conditions as further described herein. See “Summary — The Offering — Redemption rights for public shareholders upon completion of our initial business combination” on page 32 and “Summary — The Offering — Redemption of public shares and distribution and liquidation if no initial business combination” on page 37 for more information.

Notwithstanding the foregoing redemption rights, if we seek shareholder approval of our initial business combination and we do not conduct redemptions in connection with our initial business combination pursuant to the tender offer rules, our amended and restated memorandum and articles of association provide that a public shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), will be restricted from redeeming its shares with respect to more than an aggregate of 15% of the shares sold in this offering without our prior consent. However, we would not be restricting our shareholders’ ability to vote all of their shares (including all shares held by those shareholders that hold more than 15% of the shares sold in this offering) for or against our initial business combination. See “Summary — The Offering — Limitation on redemption rights of shareholders holding 15% or more of the shares sold in this offering if we hold shareholder vote” on page 35 for further discussion on certain limitations on redemption rights.

Our sponsor, Churchill Sponsor XI LLC, has M. Klein Associates Inc., as its managing member, and is an affiliate of M. Klein and Company, LLC. Our sponsor has subscribed to purchase an aggregate of 500,000 private placement units (including if the underwriter’s over-allotment option is exercised in full), at a price of $10.00 per unit, for an aggregate purchase price of$5,000,000 (including if the underwriter’s over-allotment option is exercised in full) in a private placement that will close simultaneously with the closing of this offering. We refer to these units throughout this prospectus as the private placement units. Each private placement warrant contained in the private placement units is exercisable to purchase one whole Class A ordinary share at a price of $11.50 per share. The private placement warrants will become exercisable 30 days after the completion of our initial business combination, and will not expire except upon liquidation, as described in this prospectus. None of the private placement warrants will be redeemable by us. Our public shareholders may experience material dilution from the exercise of the private placement warrants contained in the private placement units to be purchased by our sponsor simultaneously with the closing of this offering, as well as from the conversion of any working capital loans into private placement units, if elected by the sponsor. The cashless exercise of the private placement warrants contained in the private placement units, including private placement warrants that may be issued upon conversion of working capital loans, along with the public warrants under the circumstances specified in the warrant agreement as described herein, may result in material dilution to our public shareholders.

Our sponsor owns 11,500,000 Class B ordinary shares (up to 1,500,000 of which are subject to forfeiture depending on the extent to which the underwriter’s over-allotment option is exercised), which it purchased for an aggregate of $25,000. We refer to these Class B ordinary shares as the founder shares throughout this prospectus. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of our initial business combination (with such conversion taking place immediately prior to, simultaneously with, or immediately following the consummation of our initial business combination, as may be determined by our directors), or earlier at the option of the holders thereof, on a one-for-one basis, subject to adjustment and forfeiture as provided herein. Because our sponsor acquired the Class B ordinary shares at a nominal price of $.002 per share, our public shareholders will incur an immediate and substantial dilution upon the closing of this offering. Further, the Class A ordinary shares issuable in connection with the conversion of the Class B ordinary shares may result in material dilution to our public shareholders due to the anti-dilution rights of our Class B ordinary shares that may result in an issuance of Class A ordinary shares on a greater than one-to-one basis upon conversion. In the case that additional Class A ordinary shares, or equity-linked securities (as described herein), are issued or deemed issued in excess of the amounts issued in this offering and related to the closing of our initial business combination, the ratio at which the Class B ordinary shares will convert into Class A ordinary shares will be adjusted (unless the holders of a majority of the issued and outstanding Class B ordinary shares agree to waive such anti-dilution 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, on an as-converted basis, 25% of the sum of (i) the total number of all 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 units 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 units and their underlying securities issued to our sponsor or any of its affiliates or to our officers or directors upon conversion of working capital loans). If we increase or decrease the size of this offering, we will effect a share

capitalization or a share repurchase or redemption or other appropriate mechanism, as applicable, with respect to our Class B ordinary shares immediately prior to the consummation of this offering in such amount as to maintain the ownership of founder shares by our initial shareholders, on an as-converted basis, at 25% of our issued and outstanding ordinary shares upon the consummation of this offering. Prior to our initial business combination, only holders of our Class B ordinary shares will have the right to vote on the appointment and removal of directors. Holders of our Class A ordinary shares will not be entitled to vote on the appointment or removal of directors during such time. These provisions of our amended and restated memorandum and articles of association may only be amended by a special resolution passed by a majority of at least 90% (or, where such amendment is proposed in respect of the consummation of our initial business combination, two-thirds) of our ordinary shares voting at the applicable general meeting. With respect to any other matter submitted to a vote of our shareholders, including any vote in connection with our initial business combination, except as required by applicable law or stock exchange rule, holders of our Class A ordinary shares and holders of our Class B ordinary shares will vote together as a single class, with each share entitling the holder to one vote. In addition, to continue the company in a jurisdiction outside of the Cayman Islands, including the adoption of the organizational documents for such jurisdiction, our board of directors will be able to approve such continuation and organizational documents without the vote of any holders of our Class A ordinary shares and Class B ordinary shares. Collectively, the sponsor’s 10,000,000 Class B ordinary shares, its 500,000 private Class A ordinary shares and the 50,000 private placement warrants underlying its private placement units will represent 25.9% of all ordinary shares outstanding, assuming that the underwriter’s over-allotment option is not exercised and assuming forfeiture of 1,500,000 Class B ordinary shares. See “Summary — The Offering — Sponsor Information” for further discussion on our sponsor’s and our affiliates’ securities and compensation on page __; “Summary — The Offering — Transfer restrictions on founder shares” on page 24, “Summary — The Offering — Founder shares conversion and anti-dilution rights” on page 25, “Summary — The Offering — Appointment of directors; voting rights” on page 22, “Risk Factors — Risks Relating to our Management Team — The nominal purchase price paid by our initial shareholders for the founder shares may result in significant dilution to the implied value of your public shares upon the consummation of our initial business combination and our sponsor is likely to make a substantial profit on its investment in us in the event we consummate an initial business combination, even if the business combination causes the trading price of our ordinary shares to materially decline” on page 84, and “— General Risk Factors — We may issue additional ordinary shares or preference shares to complete our initial business combination or under an employee incentive plan after completion of our initial business combination. We may also issue Class A ordinary shares upon the conversion of the Class B ordinary shares at a ratio greater than one-to-one at the time of our initial business combination, or earlier at the option of the holder, as a result of the anti-dilution provisions contained in our amended and restated memorandum and articles of association. Any such issuances would dilute the interest of our shareholders and likely present other risks.” on page 93 and “Dilution” on page 104.

As more fully discussed in “Management — Conflicts of Interest” on page 158, each of our officers and directors presently has, and any of them in the future may have additional, fiduciary, contractual or other obligations or duties to one or more other entities pursuant to which such officer or director is or will be required to present a business combination opportunity to such entities. The low price that our sponsor, executive officers and directors (directly or indirectly) paid for the founder shares creates an incentive whereby our officers and directors could potentially make a substantial profit even if we select an acquisition target that subsequently declines in value and is unprofitable for public shareholders. If we are unable to complete our initial business combination within 24 months from the closing of this offering(or 27 months from the closing of this offering if we have executed a letter of intent, agreement in principle or definitive agreement for an initial business combination within 24 months from the closing of this offering), or by such earlier liquidation date as our board of directors may approve, and do not hold a shareholder vote to amend our amended and restated memorandum and articles of association to extend the amount of time we will have to consummate an initial business combination, the founder shares and private placement units and their constituent securities may expire worthless, except to the extent they receive liquidating distributions from assets outside the trust account, which could create an incentive for our sponsor, executive officers and directors to complete a transaction even if we select an acquisition target that subsequently declines in value and is unprofitable for public shareholders. Further, each of our officers and directors may have a conflict of interest with respect to evaluating a particular business combination if the retention or resignation of any such officers and directors was included by a target business as a condition to any agreement with respect to our initial business combination. Upon consummation of this

offering or thereafter, we will repay up to $600,000 in loans made to us by our sponsor to cover offering-related and organizational expenses. Additionally, we will reimburse the managing member of our sponsor in an amount equal to $30,000 per month for office space, utilities and secretarial and administrative support made available to us, as described elsewhere in this prospectus. In the event that following this offering we obtain working capital loans from our sponsor to finance transaction costs related to our initial business combination, up to $1,500,000 of such loans may be convertible into units of the post-business combination entity at a price of $10.00 per unit at the option of our sponsor, which conversion and the exercise of underlying warrants may result in material dilution to our public shareholders. Additionally, prior to or in connection with the completion of our initial business combination, there may be payment by the company to our sponsor, officers or directors, or our or their affiliates, of a finder’s fee, advisory fee, consulting fee or success fee for any services they render in order to effectuate the completion of our initial business. We may also engage one or more affiliates of our sponsor, officers or directors or their respective affiliates to provide additional services to us after this offering, including, for example, identifying potential targets or providing financial advisory services, and may pay such affiliates fair and reasonable fees or other compensation that would be determined at that time in an arm’s length negotiation. Additionally, following consummation of a business combination, members of our management team will be entitled to reimbursement for any out-of-pocket expenses related to identifying, investigating and completing an initial business combination. As a result, there may be actual or potential material conflicts of interest between our sponsor, officers, directors and their affiliates (including M. Klein and Company and our Strategic and Operating Partners) on one hand, and purchasers in this offering on the other. See the sections titled “Summary — Sponsor Information” on page 12 and “Management — Conflicts of Interest” on page 158 for more information.

Currently, there is no public market for our units, Class A ordinary shares or warrants. We intend to apply to list our units on the Nasdaq Global Market, or Nasdaq, under the symbol “CCXIU” on or promptly after the date of this prospectus. We cannot guarantee that our securities will be approved for listing on Nasdaq. We expect that the Class A ordinary shares and warrants comprising the units will begin separate trading on the 52 nd day following the date of this prospectus (or, if such date is not a business day, the following business day) unless Citigroup Global Markets Inc. informs us of its decision to allow earlier separate trading, subject to certain conditions. Once the securities comprising the units begin separate trading, we expect that the Class A ordinary shares and warrants will be listed on Nasdaq under the symbols “CCXI” and “CCXIW,” respectively.

We are an “emerging growth company” and a “smaller reporting company” under applicable federal securities laws and will be subject to reduced public company reporting requirements.

Investing in our securities involves a high degree of risk. See the section of this prospectus “Risk Factors” beginning on page 49.

Investors will not be entitled to protections normally afforded to investors in Rule 419 blank check offerings.

No offer or invitation, whether directly or indirectly, is being or may be made to the public in the Cayman Islands to subscribe for any of our securities.

(1) Includes $0.15 per unit, or $4,500,000 (or $5,175,000 if the underwriter’s overallotment option is exercised in full), payable to the underwriter upon the closing of this offering in the form of a cash underwriting discount. Also includes up to $0.40 per unit, or $12,000,000 (or $13,575,000 if the underwriter’s overallotment option is exercised in full), payable to the underwriter for deferred underwriting discounts and commissions, of which (x) $0.35 per unit, or $10,500,000 (or $12,075,000 if the underwriter’s overallotment option is exercised in full), will be placed in a trust account located in the United States as described herein and released to the underwriter only upon the completion of an initial business combination and (y) $1,500,000 (including if the underwriter’s overallotment option is exercised in full), will be payable to the underwriter from funds available outside the trust account upon our announcement that we have entered into a definitive business combination agreement, as described in this prospectus. See the section of this prospectus entitled “Underwriting” on page 204 for a description of compensation and other items of value payable to the underwriter and for a description of reimbursements for expenses the underwriter has agreed to pay us at the closing of this offering.

Of the proceeds we receive from this offering and the sale of the private placement units described in this prospectus, $300.0 million, or $345.0 million if the underwriter’s overallotment option is exercised in full ($10.00 per unit in either case), will be placed into a U.S.-based trust account with Continental Stock Transfer & Trust Company acting as trustee.

Neither the SEC nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The following table illustrates the difference between the public offering price per unit and our net tangible book value per share (NTBV), as adjusted to give effect to this offering and assuming the redemption of our public shares at varying levels and the exercise in full and no exercise of the over-allotment option. See the section titled “Dilution” on page 104 for more information.

Our sponsor and members of our management team will directly or indirectly own our securities following this offering, and accordingly, they may have a conflict of interest in determining whether a particular target business is an appropriate business with which to effectuate our initial business combination and in negotiating or accepting the terms of the transaction. Further, each of our officers and directors may have a conflict of interest with respect to evaluating a particular business combination if the retention or resignation of any such officers and directors was included by a target business as a condition to any agreement with respect to our initial business combination. Additionally, each of our officers and directors presently has, and any of them in the future may have additional, fiduciary, contractual or other obligations or duties to one or more other entities pursuant to which such officer or director is or will be required to present a business combination opportunity to such entities. As a result, there may be actual or potential material conflicts of interest between our sponsor, officers and directors and their affiliates (including M. Klein and Company and our Strategic and Operating Partners) on one hand, and purchasers in this offering on the other. See the sections titled “Proposed Business — Sourcing of Potential Business Combination Targets” on page 130 and “Management — Conflicts of Interest” on page 158 for more information.

The underwriter is offering the units for sale on a firm commitment basis. The underwriter expects to deliver the units to the purchasers on or about , 2025.

Book-Running Manager:

Citigroup

Prospectus dated , 2025.