Company: CCIXW
Filing Date: 2025-12-05
Form Type: S-4/A
Source: 0001193125-25-309933
Chunk: 13

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-12-05
Form: S-4/A
Chunk 13
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 Proposal — Interests of Certain CCIX Persons in the Business Combination ” and “ Other Information Related to CCIX — Conflicts of Interest” for a further discussion of these considerations. You should also carefully consider the risk factors described in “ Risk Factors ” beginning on page 64 of this proxy statement/prospectus.

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THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE MERITS OR FAIRNESS OF THE BUSINESS COMBINATION OR RELATED TRANSACTIONS OR PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROXY STATEMENT/PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

This proxy statement/prospectus is dated , 2025, and is first being mailed to CCIX shareholders on or about , 2025.

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CHURCHILL CAPITAL CORP IX

640 Fifth Avenue, 14th Floor

New York, NY 10019</div>

Dear Churchill Capital Corp IX Shareholders,

On behalf of Churchill Capital Corp IX, a Cayman Islands exempted company (“CCIX,” “we” or “our”) board of directors (the “CCIX Board”), we cordially invite you to an extraordinary general meeting in lieu of an annual general meeting (the “extraordinary general meeting”) of shareholders of CCIX, to be held via live webcast at a.m. Eastern Time, on , 2025. For purposes of Cayman Islands law and the CCIX current articles of association, the physical location of the extraordinary general meeting will be Willkie Farr & Gallagher LLP at 787 Seventh Avenue, New York, New York 10019. The extraordinary general meeting can be accessed by visiting,where you will be able to listen to the meeting live, ask questions and vote during the meeting.

On June 5, 2025, CCIX entered into an Agreement and Plan of Merger and Reorganization (as amended by Amendment No.1 dated September 8, 2025 and Amendment No.2 dated September 18, 2025 and as may be further amended, modified, supplemented or waived from time to time, the “Merger Agreement”), by and among CCIX, AL Merger Sub I, Inc