Company: CCIXW
Filing Date: 2025-11-24
Form Type: DEF 14A
Source: 0001193125-25-293828
Chunk: 23

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-11-24
Form: DEF 14A
Chunk 23
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 the Record Date based on information obtained from the persons named below, with respect to the beneficial ownership of Ordinary Shares, by:

| • |     | each person known by us to be the Beneficial Owner of more than 5% of our outstanding Ordinary Shares; |

| • |     | each of our officers and directors; and |

| • |     | all our officers and directors as a group. |

In the table below, percentage ownership is based on 36,662,500 Ordinary Shares, consisting of (i) 29,475,000 Class A Ordinary Shares and (ii) 7,187,500 Class B Ordinary Shares, issued and outstanding as of the Record Date. Prior to our initial Business Combination, only holders of our Class B Ordinary Shares have the right to vote on the appointment or removal of directors. Holders of our Class A Ordinary Shares will not be entitled to vote on the appointment or removal of directors during such time. With respect to any other matter submitted to a vote of our shareholders, including any vote in connection with our initial Business Combination, except as required by law, holders of our Class A Ordinary Shares and Class B Ordinary Shares vote together as a single class, with each share entitling the holder to one vote. Currently, all of the Class B Ordinary Shares are convertible into Class A Ordinary Shares on a one-for-onebasis on the day of the consummation of a Business Combination. Unless otherwise indicated, we believe that all persons named in the table have sole voting and investment power with respect to all Ordinary Shares beneficially owned by them. The following table does not reflect record or beneficial ownership of the Private Placement Warrants as these Private Placement Warrants are not exercisable within 60 days of the date of this Proxy Statement.

|                                                 |     | Class A Ordinary Shares |           |     |             |     |   |     | Class B Ordinary Shares |           |     |             |     |   |     | Approximate 
 Percentage  
 of Total    
 Outstanding 
 Ordinary    
 Shares      |      |   |
| Name and Address of Beneficial Owner (1)        |     | Number of               
 Shares                  
 Beneficially            
 Owned                   |           |     | Approximate 
 Percentage  
 of Class    |     |   |     | Number of               
 Shares                  
 Beneficially            
 Owned                   |           |     | Approximate 
 Percentage  
 of Class    |     |   |     |             |      |   |
| Michael Klein (2)                               |     |