Company: CCIXW
Filing Date: 2025-11-24
Form Type: DEF 14A
Source: 0001193125-25-293828
Chunk: 28

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-11-24
Form: DEF 14A
Chunk 28
---
 |                                                                                                                                                                                       |     | INTERNET –                                                                                                
 www.cstproxyvote.com Use the Internet to vote your proxy.                                                 
 Have your proxy card available when you access the above website. Follow the prompts to vote your shares. |
|                                     | MAIL – Mark, sign and date your proxy card and return it 
 in the postage-paid envelope provided.                   |     |                                                                                                                                                                                       |     |                                                                                                           |
| PLEASE DO NOT RETURN THE PROXY CARD 
 IF YOU ARE VOTING ELECTRONICALLY.   |                                                          |     |                                                                                                                                                                                       |     |                                                                                                           |

| p FOLD HERE • DO NOT SEPARATE • 
 INSERT IN ENVELOPE PROVIDED     
 p                               |

| PROXY CARD                                                 |     | Please mark your votes 
 like this              |
| CHURCHILL CAPITAL CORP IX —                                |     |                        |
| THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” PROPOSAL 1. |     |                        |

| CONTROL NUMBER |

| Signature                   Signature, if held 
 jointly                   Date      , 2025     |

When Shares are held by joint tenants, both should sign. When signing as attorney, executor, administrator, trustee or guardian, please give full title as such. If a corporation, please sign in full corporate name by president or other authorized officer. If a partnership, please sign in partnership name by an authorized person.

2025

Important Notice Regarding the Availability of Proxy Materials

for the Annual General Meeting of Shareholders

to be held on December 19, 2025

This notice of meeting and the accompanying

proxy statement are available at:

https://www.cstproxy.com/churchillcapitalix/2025

pFOLD HERE • DO NOT SEPARATE • INSERT IN ENVELOPE PROVIDEDp

### PROXY CARD FOR THE ANNUAL GENERAL MEETING OF SHAREHOLDERS OF

### CHURCHILL CAPITAL CORP IX
THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

The undersigned hereby appoint Michael Klein and Jay Taragin (each,