Company: CCIXW
Filing Date: 2025-12-05
Form Type: S-4/A
Source: 0001193125-25-309933
Chunk: 609

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-12-05
Form: S-4/A
Chunk 609
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 any representation, estimate or projection of the other.

If you are a CCIX shareholder and would like additional copies of this document or if you have questions about the business combination, you should contact via phone or in writing:

<div align='center'>Churchill Capital Corp IX

640 Fifth Avenue, 14th Floor

New York, NY 10019

Attention: Jay Taragin, Chief Financial Officer

Email:info@churchillcapitalcorp.com

or:

Morrow Sodali LLC

333 Ludlow Street, 5th Floor, South Tower

Stamford CT 06902

Call Toll-Free (800) 662-5200 or (203) 658-9400</div>

Email:if you are a CCIX shareholder and would like to request documents, please do so no later than five business days prior to the extraordinary general meeting, in order to receive them before the extraordinary general meeting. If you request any documents from us, we will mail them to you by first class mail, or another equally prompt means.

This document is a proxy statement/prospectus of CCIX for the extraordinary general meeting. We have not authorized anyone to give any information or make any representation about the business combination, PlusAI or CCIX that is different from, or in addition to, that contained in this proxy statement/prospectus. Therefore, if anyone does give you information of this sort, you should not rely on it. The information contained in this proxy statement/prospectus speaks only as of the date of this proxy statement/prospectus, unless the information specifically indicates that another date applies.

<div align='center'>406</div>

INDEX TO CCIX FI NANCIAL STATEMENTS Audited Financial Statements

| Report of Independent Registered Public Accounting Firm (PCAOB ID Number 100)                                                                                                
 Balance Sheets as of December 31, 2024 and 2023                                                                                                                              
 Statements of Operations for the year ended December 31, 2024 and for the period from December 18, 2023 (inception) through December 31, 2023                                |     | Page        
 F-2         
 F-3         
 F-4         |
|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:----|:------------|
| Statements of Changes in Shareholders’ (Deficit) Equity for the year ended December 31, 2024 and for the period from December 18, 2023 (inception) through December 31, 2023 |     | F-5