Company: CCIXW
Filing Date: 2025-11-24
Form Type: DEF 14A
Source: 0001193125-25-293828
Chunk: 2

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-11-24
Form: DEF 14A
Chunk 2
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 at the Meeting or any adjournment thereof. The Company believes that it is in the best interests of the Company that the selection of Withum as the Company’s independent registered public accounting firm for the year ending December 31, 2025 is ratified.

After careful consideration of all relevant factors, the Board has determined that the Auditor Ratification Proposal is in the best interests of the Company, has declared it advisable and recommends that you vote or give instruction to vote “FOR” such Proposal. Under our Amended and Restated Memorandum and Articles of Association (the “ Amended and Restated Charter”), no other business may be transacted at the Meeting. Enclosed is the Proxy Statement containing detailed information concerning the Auditor Ratification Proposal and the Meeting. Whether or not you plan to attend the Meeting, the Company urges you to read this material carefully and vote your shares. Shareholders will have the opportunity to present questions, including about the 2024 Annual Report, to the Management at the Meeting.

| November 24 2025 |     | By Order of the Board of Directors     |
|:-----------------|:----|:---------------------------------------|
|                  |     | /s/ Michael Klein                      |
|                  |     | Michael Klein                          |
|                  |     | Chief Executive Officer, President and 
 Chairman of the Board of Directors     |

Your vote is very important. Whether or not you plan to attend the Meeting, if you are a shareholder as of the Record Date, please vote as soon as possible by following the instructions in the accompanying Proxy Statement to make sure that your shares are represented and voted at the Meeting. The approval of the Auditor Ratification Proposal requires an ordinary resolution, being the affirmative vote of a simple majority of the votes cast by the holders of the Ordinary Shares present in person (including shareholders who vote online) or represented by proxy at the Meeting, or any adjournment thereof, and entitled to vote on such matter. Accordingly, if you fail to vote in person, online or by proxy at the Meeting, your shares will not be counted for the purposes of determining whether the Auditor Ratification Proposal is approved by the requisite majority. Abstentions and broker non-voteswill also not be counted for the purpose of determining whether the Auditor Ratification Proposal is approved by the requisite majority; however, abstentions and broker non-voteswill be considered present for purposes of establishing a quorum. If you hold your shares in street name through a bank, broker or other nominee, you will need to follow the