Company: CCIXW
Filing Date: 2025-12-05
Form Type: S-4/A
Source: 0001193125-25-309933
Chunk: 1020

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-12-05
Form: S-4/A
Chunk 1020
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 [____] |
| Title:                   | [____] |

<div align='center'>[Signature Page to A&R Registration Rights Agreement]</div>

IN WITNESS WHEREOF, each of the Parties has duly executed this A&R Registration Rights Agreement as of the Effective Date.

| COMPANY SHAREHOLDERS: |        |
| [____]                |        |
| By:                   |        |
| Name:                 | [____] |
| Title:                | [____] |

<div align='center'>[Signature Page to A&R Registration Rights Agreement]</div>

IN WITNESS WHEREOF, each of the Parties has duly executed this A&R Registration Rights Agreement as of the Effective Date.

| INSIDERS: |        |
| [____]    |        |
| By:       |        |
| Name:     | [____] |
| Title:    | [____] |

<div align='center'>[Signature Page to A&R Registration Rights Agreement]

Exhibit A

Form of Joinder</div>

This Joinder (this “Joinder”) to the Amended and Restated Registration Rights Agreement, made as of ___________, is executed by ___________ (“Joining Company Shareholder”).

WHEREAS, pursuant to the Merger Agreement, Joining Company Shareholder will receive shares of Common Stock; and

WHEREAS, Joining Company Shareholder is required to become a party to that certain Amended and Restated Registration Rights Agreement, dated as of June 5, 2025, among PlusAI Holdings, Inc. (f/k/a Churchill Acquisition Corp IX), a Delaware corporation (“PubCo”) and the other persons party thereto (the “A&R Registration Rights Agreement”) by executing and delivering this Joinder, whereupon such Joining Company Shareholder will be treated as a Party (with the same rights and obligations as other Insiders party thereto) for all purposes of the A&R Registration Agreement.

NOW, THEREFORE, in consideration of the foregoing and the respective covenants and agreements set forth herein, and intending to be legally bound hereby, the parties hereto agree as follows:

Section 1.Definitions. To the extent capitalized words used in this Joinder are not defined in this Joinder, such words shall have the respective meanings set forth in the A&R Registration Rights Agreement.

Section 2.Joinder. Joining Company Shareholder hereby acknowledges and agrees that (a) such Joining Company Shareholder has received and read the A&R Registration Rights Agreement