Company: CCIXW
Filing Date: 2025-11-24
Form Type: DEF 14A
Source: 0001193125-25-293828
Chunk: 16

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-11-24
Form: DEF 14A
Chunk 16
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 the receipt of the required approval by the shareholders of the Company and
PlusAI and the satisfaction or waiver of certain other closing conditions set forth in the Merger Agreement (the transactions contemplated by the Merger Agreement, including the Mergers, the “PlusAI Business Combination.”)

For more information about the PlusAI Business Combination, see the Company’s Current Report on Form
8-K, filed with the SEC on June 6, 2025.

You are not being asked to vote on the Business Combination at this time.

8

THE MEETING

This Proxy Statement is being provided to our shareholders as part of a solicitation of proxies by the Board for use at the Meeting. This
Proxy Statement contains important information regarding the Meeting, the Auditor Ratification Proposal on which you are being asked to vote and information you may find useful in determining how to vote and voting procedures.

This Proxy Statement is being first mailed on or about November 24, 2025 to all Shareholders of Record as of November 18, 2025, the
Record Date for the Meeting. Shareholders of Record who owned Ordinary Shares at the close of business on the Record Date are entitled to receive notice of, attend and vote at the Meeting.

Date, Time and Place of the Meeting

The
Meeting will be held on December 19, 2025, at 9:00 a.m. Eastern Time, at the offices of Ellenoff Grossman & Schole LLP located at 1345 Avenue of the Americas, 11 Floor, New York,
New York 10105, or at such other time, on such other date and at such other place to which the Meeting may be adjourned.

Attending the Meeting

Only shareholders who own Ordinary Shares as of the close of business on the Record Date will be entitled to attend the Meeting. If
you are such a shareholder, you will be permitted to attend the Meeting in person at the offices of Ellenoff Grossman & Schole LLP or participate virtually via the Internet. You are requested to confirm your attendance, whether in
person or online, at least two business days in advance of the Meeting by contacting Ellenoff Grossman & Schole LLP, c/o Kyle Unice, 1345 Avenue of the Americas, 11 Floor, New
York, New York, 10105. If attending online, upon receipt of such confirmation, the webcast information for the Meeting will be provided to you.

You will not be required to attend the Meeting in person in order