Company: CCIXW
Filing Date: 2025-12-05
Form Type: S-4/A
Source: 0001193125-25-309933
Chunk: 21

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-12-05
Form: S-4/A
Chunk 21
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 Ordinary Shares held by non-affiliates exceeds $700,000,000 as of the end of the prior June 30th; and (2) the date on which CCIX has issued more than $1,000,000,000 in nonconvertible debt during the prior three-year period. References herein to “emerging growth company” shall have the meaning associated with it in the JOBS Act. The accompanying proxy statement/prospectus provides you with detailed information about the business combination and other matters to be considered at the extraordinary general meeting. We encourage you to carefully read the entire document, including the Annexes attached to the accompanying proxy statement/prospectus. You should also carefully consider the risk factors described in “ Risk Factors ” beginning on page 60. Your vote is important regardless of the number of CCIX Ordinary Shares you own. Whether you plan to attend the extraordinary general meeting or not, please sign, date and return the enclosed proxy card as soon as possible, and no later than the time of the extraordinary general meeting (or any adjournment thereof) in the envelope provided. If your CCIX Class A Ordinary Shares are held in “street name” or are in a margin or similar account, you should contact your broker to ensure that votes related to the shares you beneficially own are properly counted. The business combination described in the accompanying proxy statement/prospectus has not been approved or disapproved by the SEC or any state securities commission nor has the SEC or any state securities commission passed upon the merits or fairness of the business combination, or passed upon the accuracy or adequacy of the disclosure in the accompanying proxy statement/prospectus. Any representation to the contrary is a criminal offense. Thank you for your participation. We look forward to your continued support.

| By Order of the Board of Directors |
| Michael Klein                      |
| Chairman of the Board of Directors |

, 2025 IF YOU RETURN YOUR PROXY CARD WITHOUT AN INDICATION OF HOW YOU WISH TO VOTE, YOUR CCIX SHARES WILL BE VOTED AT THE DISCRETION OF YOUR NOMINATED PROXY.

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TO EXERCISE YOUR REDEMPTION RIGHTS, YOU MUST ELECT TO HAVE CCIX REDEEM YOUR CCIX PUBLIC SHARES FOR A PRO RATA PORTION OF THE FUNDS HELD IN THE TRUST ACCOUNT (NET OF CERTAIN PERMITTED WITHDRAWALS) AND TENDER SUCH SHARES TO CCIX’S TRANSFER AGENT AT LEAST TWO BUSINESS DAYS PRIOR TO THE