Michael Stuart Klein - 12 Feb 2026 Form 4 Insider Report for Churchill Capital Corp X/Cayman (CCCX)

Reporting relationship: Former Chief Executive Officer, President and Chairman of the Board of Directors of CCX., Director, 10%+ Owner
Issuer ticker: CCCX
Reported as of: 12 Feb 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 17 Feb 2026, 16:30:07 UTC
Prior SEC filing: 19 Dec 2025
Next SEC filing: 28 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Michael Klein

Key filing fact

Michael Stuart Klein filed Form 4 for Churchill Capital Corp X/Cayman (CCCX) on 17 Feb 2026.

Key facts

This page summarizes Michael Stuart Klein's Form 4 filing for Churchill Capital Corp X/Cayman (CCCX).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 17 Feb 2026, 16:30.

Change

Previous filing in this sequence was filed on 19 Dec 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (3)

CIK 0001327392 Primary reporting owner

Klein Michael Stuart

Relationship: Former Chief Executive Officer, President and Chairman of the Board of Directors of CCX., Director, 10%+ Owner
Address: 640 FIFTH AVENUE, 14TH FLOOR, NEW YORK
Signature: /s/ Michael Klein
Signature date: 17 Feb 2026

CIK 0001848787

Churchill Sponsor X LLC

Relationship: Former Chief Executive Officer, President and Chairman of the Board of Directors of CCX., Director, 10%+ Owner
Address: 640 FIFTH AVENUE, 14TH FLOOR, NEW YORK
Signature: M. Klein Associates, Inc., By: /s/ Jay Taragin, Name: Jay Taragin, Title: Authorized Person
Signature date: 17 Feb 2026

CIK 0001751504

M. Klein Associates, Inc.

Relationship: Former Chief Executive Officer, President and Chairman of the Board of Directors of CCX., Director, 10%+ Owner
Address: 640 FIFTH AVENUE, 14TH FLOOR, NEW YORK
Signature: Churchill Sponsor X LLC, By: M. Klein Associates, Inc., its manager, By: /s/ Jay Taragin, Name: Jay Taragin, Title: Authorized Person:
Signature date: 17 Feb 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CCCX transaction

Common Stock

Conversion of derivative security

Transaction value
Shares: +10,650,000
Change %
Price
Shares after: 10,650,000
Date: 12 Feb 2026
Ownership: See footnote
Footnotes: F1, F2, F3, F4, F5

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CCCX transaction Derivative

Class B ordinary shares

Conversion of derivative security

Transaction value
Shares: -10,350,000
Change %: -100%
Price
Shares after: 0
Date: 12 Feb 2026
Ownership: See footnote
Underlying class: Common Stock
Underlying amount: 10,350,000
Exercise price
Footnotes: F1, F2, F3, F5

CCCX transaction Derivative

Warrant (Right to Buy)

Other

Transaction value
Shares: +75,000
Change %
Price
Shares after: 75,000
Date: 12 Feb 2026
Ownership: See footnote
Underlying class: Common Stock
Underlying amount: 75,000
Exercise price: $11.50
Footnotes: F5, F6

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Michael Stuart Klein is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 6 footnotes

Footnote F1

In connection with the transactions consummated on February 13, 2026 pursuant to that certain Agreement and Plan of Merger and Reorganization Agreement, dated as of September 8, 2025 (the "Merger Agreement"), by and among Infleqtion, Inc. (the "Issuer") (f/k/a Churchill Capital Corp X ("CCX")), AH Merger Sub I, Inc., a wholly owned subsidiary of the Issuer ("Merger Sub I"), AH Merger Sub II, LLC, a wholly owned subsidiary of the Issuer ("Merger Sub II") and ColdQuanta, Inc. (d/b/a Infleqtion), a Delaware corporation ("Legacy Infleqtion"). Pursuant to the Merger Agreement, and on the terms and subject to the satisfaction or waiver of the conditions set forth therein, the parties effected a business combination transaction by which Merger Sub I merged with and into the Legacy Infleqtion, with Legacy Infleqtion continuing as the surviving corporation and a wholly-owned subsidiary of the Issuer ("First Merger"),

Footnote F2

(Continued from footnote 1) and immediately following the First Merger, the surviving corporation of the First Merger merged with and into Merger Sub II, with Merger Sub II continuing as the surviving entity (the "Second Merger" and, together with the First Merger, the "Mergers").

Footnote F3

The Issuer effected a deregistration under Article 41 of CCX's amended and restated memorandum and articles of association and Section 206 of the Companies Act (As Revised) of the Cayman Islands and a domestication under Section 388 of the Delaware General Corporation Law, pursuant to which CCX's jurisdiction of incorporation changed from the Cayman Islands to the State of Delaware (the "Domestication"). Effective upon the Domestication, (i) each Class B ordinary share of the Issuer automatically converted into a Class A ordinary share (the "Class A Ordinary Share") on a one-to-one basis, and (ii) each Class A Ordinary Share converted into common stock, par value $0.0001 per share ("Common Stock"), of the Issuer, Infleqtion, Inc., on a one-to-one basis. The reporting person now holds Common Stock of the Issuer rather than Class A Ordinary Shares in a Cayman Islands company.

Footnote F4

Includes 300,000 shares which were acquired as part of 300,000 units pursuant to a Private Placement Units Purchase Agreement by and between the Churchill Sponsor X LLC (the "Sponsor") and CCX, and have been continually held since CCX's initial public offering. Effective upon the Domestication, (i) each unit of CCX separated into one share per unit and one-quarter of one whole warrant of CCX per unit, each whole warrant exercisable for one Class A Ordinary Share, (ii) each share converted into one share of Common Stock of the Issuer on a one-to-one basis and (iii) each warrant automatically converted into a warrant to acquire Common Stock of the Issuer.

Footnote F5

The reported shares and warrants of the Issuer are directly held by the Sponsor. Michael Klein is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of the Sponsor. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 under the Securities Exchange Act of 1934, as amended, or otherwise, any of the Reporting Persons is the beneficial owner of any securities reported herein. The Reporting Persons disclaim beneficial ownership of any securities of the Issuer except to the extent of such Reporting Person's pecuniary interest therein.

Footnote F6

Represents 75,000 shares underlying warrants which were acquired as part of 300,000 units pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and CCX, and have been continually held since CCX's initial public offering. Effective upon the Domestication, (i) each unit of CCX separated into one share per unit and one-quarter of one whole warrant of CCX per unit, each whole warrant exercisable for one Class A Ordinary Share, (ii) each share converted into one share of Common Stock of the Issuer on a one-to-one basis and (iii) each warrant automatically converted into a warrant to acquire Common Stock of the Issuer. The warrants become exercisable 30 days after the completion of the Mergers.

SEC remarks

Former Chief Executive Officer, President and Chairman of the Board of Directors of CCX.