Company: CCIXW
Filing Date: 2025-11-24
Form Type: DEF 14A
Source: 0001193125-25-293828
Chunk: 27

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-11-24
Form: DEF 14A
Chunk 27
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WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports, proxy statements and other information with the SEC as required by the Exchange Act. Our public
filings are also available to the public from the SEC’s website at www.sec.gov. You may request a copy of our filings with the SEC (excluding exhibits) at no cost by contacting us at the address and/or telephone number below.

Churchill Capital Corp IX

640
Fifth Avenue, 14 Floor

New York, New York 10019

Attn: Jay Taragin

Telephone No.:
(212) 380-7500

If you would like additional copies of this Proxy Statement or if you have
questions about the Auditor Ratification Proposal, you should contact the Solicitation Agent at the following address and e-mail address:

Sodali & Co

333 Ludlow
Street, 5 Floor, South Tower

Stamford, CT 06902

Telephone: (800) 662-5200

Bank and Brokers (203) 658-9400

Email: CCIX.info@investor.sodali.com

You will not be charged for any of the documents you request. If your shares are held in a stock brokerage account or by a bank or other
nominee, you should contact your broker, bank or other nominee for additional information.

If you are our shareholder and would like to request documents, please do so by December12, 2025, five business days prior to the Meeting, in order to receive them before the Meeting. If you request any documents from us, such documents will be mailed to you by first
class mail or another equally prompt means.

19

| YOUR VOTE IS IMPORTANT. PLEASE VOTE 
 TODAY.                              |     | 2025 |

| Vote by Internet – QUICK é é é EASY                  
 IMMEDIATE – 24 Hours a Day, 7 Days a Week or by Mail |

| CHURCHILL CAPITAL                   
 CORP IX                             |                                                          |     | Your Internet vote authorizes the named proxies to vote your shares in the same manner as if you marked, signed and returned your proxy card. Votes submitted electronically over the 
 Internet must be received by 11:59 p.m., Eastern Time, on December 18, 2025.                                                                                                          |     |                                                                                                           |
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