Company: CCIXW
Filing Date: 2025-12-05
Form Type: S-4/A
Source: 0001193125-25-309933
Chunk: 2

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-12-05
Form: S-4/A
Chunk 2
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, acting pursuant to said Section 8(a), may determine.

TABLE OF CO-REGISTRANTS

| Exact Name ofCo-Registrant asSpecified in itsCharter(1)(2) |     | State or Other Jurisdiction ofIncorporation orOrganization |     | Primary StandardIndustrial ClassificationCode Number |     | I.R.S.EmployerIdentification Number |
| Plus Automation, Inc.                                      |     | Delaware                                                   |     |                                                 7373 |     | 93-2913093                          |

(1) The Co-Registrant has the following principal executive office: Plus Automation, Inc. 3315 Scott Boulevard, Suite 300 Santa Clara, CA 95054 Tel: (408) 508-4758 (2) The agent for service for the Co-Registrant is: Steven J. Spinner Plus Automation, Inc. 3315 Scott Boulevard, Suite 300 Santa Clara, CA 95054 Tel: (408) 508-4758

<div align='center'>EXPLANATORY NOTE</div>

This proxy statement/prospectus relates to an Agreement and Plan of Merger and Reorganization, dated as of June 5, 2025 (as amended by Amendment No.1 dated September 8, 2025 and Amendment No.2 dated September 18, 2025 and as may be further amended, modified, supplemented or waived from time to time, the “ Merger Agreement ”), by and among Churchill Capital Corp IX, a Cayman Islands exempted company (“ CCIX ”), AL Merger Sub I, Inc., a Delaware corporation and direct, wholly owned subsidiary of CCIX (“ Merger Sub I ”), AL Merger Sub II, LLC, a Delaware limited liability company and a direct, wholly owned subsidiary of CCIX (“ Merger Sub II ”, and, together with Merger Sub I, “ Merger Subs ”) and Plus Automation, Inc., a Delaware corporation (“ PlusAI ”), a copy of which is attached to this proxy statement/prospectus as an annex thereto.

The Merger Agreement, among other things and subject to the terms and conditions contained therein, provides for (a) the transfer of the registration of CCIX by way of continuation from the Cayman Islands to the State of Delaware (the “ Domestication ”), and (b) following the Domestication, the merger of Merger Sub I with and into PlusAI, with PlusAI continuing as the surviving corporation, and immediately thereafter, such