Table of Contents As filed with the Securities and Exchange Commission on April 12, 2024. Registration No. 333-278192 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Churchill Capital Corp IX (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) Cayman Islands 6770 86-1885237 (Primary Standard Industrial Classification Code Number) 640 Fi ...