Citadel entities disclose 3.9% Churchill Capital Corp X (CCCX) ownership

Rhea-AI Filing Summary

Citadel-affiliated investment entities report a minority stake in Churchill Capital Corp X’s Class A ordinary shares. Citadel Securities LLC and related entities may be deemed to beneficially own 780,669 Shares, while Citadel Advisors–affiliated entities may be deemed to beneficially own 841,990 Shares.

Kenneth Griffin may be deemed to beneficially own a total of 1,622,659 Shares, representing 3.9% of the class, based on 41,700,000 Shares outstanding as of November 12, 2025. All reported positions carry shared, and no sole, voting and dispositive power. The reporting persons certify the holdings are not for the purpose of changing or influencing control of the company.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Churchill Capital Corp X

(Name of Issuer)

Class A Ordinary Shares, par value $0.0001 per share (the "Shares")

(Title of Class of Securities)

G2130T108

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. G2130T108

1

Names of Reporting Persons

Citadel Securities GP LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 780,669.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 780,669.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

780,669.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

1.9 %

12

Type of Reporting Person (See Instructions)

HC, OO

Comment for Type of Reporting Person: The percentages reported in this Schedule 13G are based upon 41,700,000 Shares outstanding as of November 12, 2025 (according to the issuer's Form 10-Q as filed with the Securities and Exchange Commission on November 12, 2025).

SCHEDULE 13G

CUSIP No. G2130T108

1

Names of Reporting Persons

Citadel Securities LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 780,669.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 780,669.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

780,669.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

1.9 %

12

Type of Reporting Person (See Instructions)

BD, OO

SCHEDULE 13G

CUSIP No. G2130T108

1

Names of Reporting Persons

Citadel Securities Group LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 780,669.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 780,669.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

780,669.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

1.9 %

12

Type of Reporting Person (See Instructions)

HC, PN

SCHEDULE 13G

CUSIP No. G2130T108

1

Names of Reporting Persons

Citadel Advisors LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 841,990.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 841,990.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

841,990.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

2.0 %

12

Type of Reporting Person (See Instructions)

IA, HC, OO

SCHEDULE 13G

CUSIP No. G2130T108

1

Names of Reporting Persons

Citadel Advisors Holdings LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 841,990.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 841,990.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

841,990.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

2.0 %

12

Type of Reporting Person (See Instructions)

HC, PN

SCHEDULE 13G

CUSIP No. G2130T108

1

Names of Reporting Persons

Citadel GP LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 841,990.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 841,990.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

841,990.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

2.0 %

12

Type of Reporting Person (See Instructions)

HC, OO

SCHEDULE 13G

CUSIP No. G2130T108

1

Names of Reporting Persons

Kenneth Griffin

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,622,659.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,622,659.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,622,659.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

3.9 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Churchill Capital Corp X
(b)	Address of issuer's principal executive offices: 640 Fifth Avenue, 14th Floor, New York, NY, 10019
Item 2.
(a)	Name of person filing: This Schedule 13G is being jointly filed by Citadel Securities GP LLC ("CSGP"), Citadel Securities LLC ("Citadel Securities"), Citadel Securities Group LP ("CALC4"), Citadel Advisors LLC ("Citadel Advisors"), Citadel Advisors Holdings LP ("CAH"), Citadel GP LLC ("CGP"), and Mr. Kenneth Griffin (collectively with CSGP, Citadel Securities, CALC4, Citadel Advisors, CAH, and CGP, the "Reporting Persons") with respect to the Shares of the above-named issuer owned by Citadel Securities and Citadel Multi-Strategy Equities Master Fund Ltd., a Cayman Islands company ("CM"). Such owned Shares may include other instruments exercisable for or convertible into Shares. CALC4 is the non-member manager of Citadel Securities. CSGP is the general partner of CALC4. Citadel Advisors is the portfolio manager for CM. CAH is the sole member of Citadel Advisors. CGP is the general partner of CAH. Mr. Griffin is the President and Chief Executive Officer of CGP, and owns a controlling interest in CGP and CSGP. The filing of this statement shall not be construed as an admission that any of the Reporting Persons is the beneficial owner of any securities covered by the statement other than the securities actually owned by such person (if any).
(b)	Address or principal business office or, if none, residence: The address of each of the Reporting Persons is 830 Brickell Plaza, Miami, Florida 33131.
(c)	Citizenship: Each of CSGP, Citadel Securities, Citadel Advisors, and CGP is organized as a limited liability company under the laws of the State of Delaware. Each of CALC4 and CAH is organized as a limited partnership under the laws of the State of Delaware. Mr. Griffin is a U.S. citizen.
(d)	Title of class of securities: Class A Ordinary Shares, par value $0.0001 per share (the "Shares")
(e)	CUSIP No.: G2130T108
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1. Citadel Securities LLC may be deemed to beneficially own 780,669 Shares. 2. Each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own 780,669 Shares. 3. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own 841,990 Shares 4. Mr. Griffin may be deemed to beneficially own 1,622,659 Shares.
(b)	Percent of class: 1. The number of Shares that Citadel Securities LLC may be deemed to beneficially own constitutes 1.9% of the Shares outstanding. 2. The number of Shares that each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own constitutes 1.9% of the Shares outstanding. 3. The number of Shares that each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own constitutes 2.0% of the Shares outstanding. 4. The number of Shares that Mr. Griffin may be deemed to beneficially own constitutes 3.9% of the Shares outstanding.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1. Citadel Securities LLC: 0 2. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0 3. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0 4. Mr. Griffin: 0
	(ii) Shared power to vote or to direct the vote: 1. Citadel Securities LLC: 780,669 2. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 780,669 3. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 841,990 4. Mr. Griffin: 1,622,659
	(iii) Sole power to dispose or to direct the disposition of: 1. Citadel Securities LLC: 0 2. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0 3. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0 4. Mr. Griffin: 0
	(iv) Shared power to dispose or to direct the disposition of: 1. Citadel Securities LLC: 780,669 2. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 780,669 3. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 841,990 4. Mr. Griffin: 1,622,659
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Citadel Securities GP LLC

Signature:	/s/ Seth Levy
Name/Title:	Seth Levy, Authorized Signatory
Date:	02/17/2026

Citadel Securities LLC

Signature:	/s/ Seth Levy
Name/Title:	Seth Levy, Authorized Signatory
Date:	02/17/2026

Citadel Securities Group LP

Signature:	/s/ Seth Levy
Name/Title:	Seth Levy, Authorized Signatory
Date:	02/17/2026

Citadel Advisors LLC

Signature:	/s/ Seth Levy
Name/Title:	Seth Levy, Authorized Signatory
Date:	02/17/2026

Citadel Advisors Holdings LP

Signature:	/s/ Seth Levy
Name/Title:	Seth Levy, Authorized Signatory
Date:	02/17/2026

Citadel GP LLC

Signature:	/s/ Seth Levy
Name/Title:	Seth Levy, Authorized Signatory
Date:	02/17/2026

Kenneth Griffin

Signature:	/s/ Seth Levy
Name/Title:	Seth Levy, attorney-in-fact*
Date:	02/17/2026

Comments accompanying signature: * Seth Levy is signing on behalf of Kenneth Griffin as attorney-in-fact pursuant to a power of attorney previously filed with the Securities and Exchange Commission, and hereby incorporated by reference herein. The power of attorney was filed as an attachment to a filing by Citadel Advisors LLC on Schedule 13G for Allakos Inc. on October 13, 2023.

FAQ

What stake does Citadel report in Churchill Capital Corp X (CCCX)?

Citadel-related entities report a minority stake in Churchill Capital Corp X. Kenneth Griffin may be deemed to beneficially own 1,622,659 Class A Shares, representing 3.9% of the class, based on 41,700,000 Shares outstanding as of November 12, 2025.

Which Citadel entities are included in this Churchill Capital Corp X (CCCX) disclosure?

The disclosure covers Citadel Securities GP LLC, Citadel Securities LLC, Citadel Securities Group LP, Citadel Advisors LLC, Citadel Advisors Holdings LP, Citadel GP LLC, and Kenneth Griffin. These entities collectively report beneficial ownership of Churchill Capital Corp X’s Class A ordinary shares.

How many Churchill Capital Corp X (CCCX) shares does Kenneth Griffin beneficially own?

Kenneth Griffin may be deemed to beneficially own 1,622,659 Class A ordinary Shares of Churchill Capital Corp X. This amount represents 3.9% of the outstanding Shares, calculated using 41,700,000 Shares outstanding as of November 12, 2025, as referenced in the disclosure.

Do Citadel and Kenneth Griffin have sole voting power over CCCX shares?

They report no sole voting or dispositive power over Churchill Capital Corp X Shares. All reported positions reflect shared voting and shared dispositive power, meaning decisions over these Shares are made jointly, rather than by any one reporting person alone.

Is Citadel’s Churchill Capital Corp X (CCCX) stake intended to influence control?

The reporting persons certify the securities were not acquired and are not held to change or influence control of Churchill Capital Corp X. They also state the holdings are not part of any transaction with that purpose, other than limited activities related to director nominations.

What percentage of Churchill Capital Corp X (CCCX) does Citadel Securities LLC hold?

Citadel Securities LLC may be deemed to beneficially own 780,669 Class A Shares of Churchill Capital Corp X. This represents 1.9% of the outstanding class, based on 41,700,000 Shares outstanding as of November 12, 2025, as cited in the ownership details.