Churchill Capital Corp IX/Cayman 10-Q

Item 5. Other Information None. 18 Table of Contents Item 6. Exhibits The following exhibits are filed as part of, or incorporated by reference into, this Quarterly Report. No. Description of Exhibit 31.1* Certification of the Principal Executive Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 31.2* Certification of the Principal Financial Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 32.1** Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 32.2** Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 101.INS* XBRL Instance Document 101.SCH* XBRL Taxonomy Extension Schema Document 101.CAL* XBRL Taxonomy Extension Calculation Link base Document 101.DEF* XBRL Taxonomy Extension Definition Link base Document 101.LAB* XBRL Taxonomy Extension Labels Link base Document 101.PRE* XBRL Taxonomy Extension Presentation Link base Document 104* Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) * Filed herewith. ** Furnished herewith. 19 Table of Contents SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. CHURCHILL CAPITAL CORP IX Date: May 13, 2025 By: /s/ Michael Klein Name: Michael Klein Title: Chief Executive Officer, President, and Chairman of the Board of Directors (Principal Executive Officer) Date: May 13, 2025 By: /s/ Jay Taragin Name: Jay Taragin Title: Chief Financial Officer (Principal Financial and Accounting Officer) 20