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

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-11-24
Form: DEF 14A
Chunk 11
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 |     | At the Meeting. You may vote at the Meeting. |

Whether or not you plan to attend the Meeting, we urge you to vote by proxy to ensure your vote is counted. You may still attend the Meeting and vote if you have already voted by proxy. How can I vote if I am a Beneficial Owner of shares held in Street Name? If you were a Beneficial Owner of Ordinary Shares held in Street Name on the Record Date, with respect to the Auditor Ratification Proposal:

| • |     | At the Meeting. If you wish to vote at the Meeting, you must obtain a legal proxy from the brokerage firm,                                                     
 bank, broker-dealer or other similar organization that holds your shares. Please contact that organization for instructions regarding obtaining a legal proxy. |

| • |     | By Mail. You may vote by proxy by filling out the vote instruction form and sending it back in the                  
 envelope provided by your brokerage firm, bank, broker-dealer or other similar organization that holds your shares. |

| • |     | By telephone or online. You may vote by proxy by submitting your proxy by telephone or online (if those                                                                                                                                                   
 options are available to you) in accordance with the instructions on the enclosed proxy card or voting instruction card. This is allowed if you hold shares in Street Name and your bank, broker or other nominee offers those alternatives; availability 
 and specific procedures vary. If your bank or brokerage firm does not offer online or telephone voting information, please complete and return your proxy card in the self-addressed, postage-paid envelope provided.                                     |

Will my shares be voted if I do not provide my proxy? If you hold your shares directly in your own name, they will not be voted if you do not provide a proxy. Your shares may be voted under certain circumstances if they are held in the name of a brokerage firm. Brokerage firms generally have the authority to vote shares not voted by customers on certain “routine” matters, including the ratification of an independent registered public accounting firm. Accordingly, at the Meeting, your shares may be voted by your brokerage firm for the Auditor Ratification Proposal. May I change my vote after I have voted or revoke my proxy after it is granted? Yes. You may change your vote by:

| • |     | entering a new vote online or by telephone, if those voting options are available to you; |

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| • |     | sending a later-dated, signed proxy card to Churchill Capital Corp IX c/o Jay Taragin,