As filed with the Securities and Exchange Commission on May 1, 2024. Registration No. 333-278192 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 2 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) Cayman Islands 6770 86-1885237 (State or Other Jurisdiction of Incorporation or Organization) (Primary Standard Industrial Classification Code Number) Copies to: Douglas S. Ellen ...