FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Klein Michael Stuart (Last) (First) (Middle) 640 FIFTH AVENUE, 14TH FLOOR (Street) NEW YORK NY 10019 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 05/01/2024	3. Issuer Name and Ticker or Trading Symbol Churchill Capital Corp IX/Cayman [ CCIX U ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director X 10% Owner X Officer (give title below) Other (specify below) See Remarks	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Class B Ordinary Shares, par value $0.0001 per share	(1)	(1)	Class A Ordinary Shares, par value $0.0001 per share	7,187,500	(1)	I	See Footnotes (1) (2)

Explanation of Responses:

1. The reported shares of Churchill Capital Corp IX (the "Issuer") are directly held by Churchill Sponsor IX LLC (the "Sponsor") and include up to 937,500 Class B ordinary shares that are subject to forfeiture if the underwriters of the Issuer's initial public offering do not exercise in full an option granted to them to cover over-allotments. Pursuant to the Issuer's Amended and Restated Memorandum And Articles of Association, the Class B ordinary shares will automatically convert into the Class A ordinary shares, par value $0.0001 per share, of the Issuer at the time of the Issuer's initial business combination on a one-for-one basis, or at any time prior to the Issuer's initial business combination, at the option of the holder, subject to adjustment as described under the heading "Description of Securities--Founder Shares" in the Issuer's registration statement on Form S-1 (File No. 333-278192). The Class B ordinary shares have no expiration date.

2. Michael Klein is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of the Sponsor.

Remarks:

Chief Executive Officer, President and Chairman of the Board of Directors

	/s/ Michael Klein	05/02/2024
	** Signature of Reporting Person	Date
	M. Klein Associates, Inc., By: /s/ Jay Taragin, Name: Jay Taragin, Title: Authorized Person	05/02/2024
	** Signature of Reporting Person	Date
	Churchill Sponsor IX LLC, By: M. Klein Associates, Inc., its manager, By: /s/ Jay Taragin, Name: Jay Taragin, Title: Authorized Person:	05/02/2024
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
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