Company: CCIXW
Filing Date: 2025-11-24
Form Type: DEF 14A
Source: 0001193125-25-293828
Chunk: 19

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-11-24
Form: DEF 14A
Chunk 19
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 proxy card and voting instructions with these proxy materials from that organization rather than directly from us. If you are a Beneficial Owner of shares held in Street Name:

| • |     | 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. Although  
 most banks, brokers and other nominees offer these voting 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.                                                                                                                                                                                                    |

Changing Your Vote and Revoking Your Proxy You may change your vote by:

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

| • |     | sending a later-dated, signed proxy card to Churchill Capital Corp IX c/o Jay Taragin, 640 Fifth Avenue, 14th Floor, New York, NY 10019, so that it is received by the Company prior to the Meeting; or |

| • |     | attending and voting during the Meeting. |

You also may revoke your proxy by sending a notice of revocation to our Chief Financial Officer, which must be received by our Chief Financial Officer prior to the Meeting. Attending the Meeting will not cause your previously granted proxy to be revoked unless you specifically so request. However, if your shares are held in Street Name by your broker, bank or another nominee, you must contact your broker, bank or other nominee to confirm the procedures for changing your vote and/or revoking your proxy. No Additional Matters The Meeting has been called only to consider and vote on the Auditor Ratification Proposal. Under the Amended and Restated Charter, other than procedural matters incident to the conduct