Company: CCIXW
Filing Date: 2025-12-05
Form Type: S-4/A
Source: 0001193125-25-309933
Chunk: 0

Company: Churchill Capital Corp IX/Cayman
Filing Date: 2025-12-05
Form: S-4/A
Chunk 0
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As filed with the Securities and Exchange Commission on December 5, 2025. Registration No. 333-290370 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 1 TO FORM S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Churchill Capital Corp IX (Exact name of registrant as specified in its charter) For Co-Registrants, see “Table of Co-Registrants” on the following page.

| Cayman Islands*                                               |                                                   6770 | 86-1885237                            |
| (State or other jurisdiction ofincorporation or organization) | -Primary Standard IndustrialClassification Code Number | -I.R.S. EmployerIdentification Number |

640 Fifth Avenue , 14th Floor New York , NY 10019 Tel: ( 212 ) 380-7500 (Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices) Jay Taragin Chief Financial Officer c/o Churchill Capital Corp IX 640 Fifth Avenue , 14th Floor New York , NY 10019 Tel: ( 212 ) 380-7500 (Name, address, including zip code, and telephone number, including area code, of agent for service)

| Michael Nordtvedt Jeana KimRemi Korenblit Wilson Sonsini Goodrich & Rosati, Professional Corporation 701 Fifth Avenue, Suite 5100 Seattle, WA 98104-7036 (206) 883-2500 | Copies to:David W. LiuPresident and Chief Executive OfficerPlus Automation, Inc.3315 Scott Boulevard, Suite 300Santa Clara, CA 95054(408) 508-4758 | Gregory AstrachanSean EwenEsther ChangWillkie Farr & Gallagher LLP787 Seventh AvenueNew York, NY 10019(212) 728-8000 |

Approximate date of commencement of proposed sale of the securities to the public: As soon as practicable after this registration statement becomes effective and upon completion of the merger. If the securities being registered on this Form are being offered in connection with the formation of a holding company and there is compliance with General Instruction G, check the following box. ☐ If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.