Klein Michael Stuart

SEC source: 0001213900-26-085827 · ownership.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · See Remarks · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · 10% owner

CHURCHILL SPONSOR XIII LLC · CIK 0002124749 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 350,000

F1 · shares: Represents shares underlying the private placement units (each unit consisting of one Class A ordinary share and one-tenth of one warrant, each whole warrant exercisable to purchase one Class A ordinary share) directly held by Churchill Sponsor XIII LLC (the "Sponsor"), and which were acquired pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and Churchill Capital Corp XIII.

F1 · balance_after: Represents shares underlying the private placement units (each unit consisting of one Class A ordinary share and one-tenth of one warrant, each whole warrant exercisable to purchase one Class A ordinary share) directly held by Churchill Sponsor XIII LLC (the "Sponsor"), and which were acquired pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and Churchill Capital Corp XIII.

F2 · ownership.nature: Michael Stuart Klein, the Chief Executive Officer, President and a director of the Issuer, is the controlling shareholder of M. Klein Associates, Inc., which is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held by the Sponsor. As such, Mr. Klein may be deemed to possess beneficial ownership of the securities held directly by the Sponsor. Mr. Klein disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001327392-26-000004 · form4-07022026_110759.xml · derivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,500

Underlying: Class A Common Stock · 17,500 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A Common Stock of the Issuer.

F2 · derivative.exercise_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

F2 · derivative.expiration_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

SEC source: 0001327392-26-000002 · form4-06262026_100657.xml · derivative · entry 4

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 12,430 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A Common Stock of the Issuer.

F2 · derivative.exercise_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

F2 · derivative.expiration_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

SEC source: 0001327392-26-000002 · form4-06262026_100657.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,336

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001213900-26-049361 · ownership.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · See Remarks · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · See Remarks · 10% owner

CHURCHILL SPONSOR XII LLC · CIK 0002124744 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 350,000

F1 · shares: Represents shares underlying the private placement units (each unit consisting of one Class A ordinary share and one-tenth of one warrant, each whole warrant exercisable to purchase one Class A ordinary share) directly held by Churchill Sponsor XII LLC (the "Sponsor"), and which were acquired pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and Churchill Capital Corp XII.

F1 · balance_after: Represents shares underlying the private placement units (each unit consisting of one Class A ordinary share and one-tenth of one warrant, each whole warrant exercisable to purchase one Class A ordinary share) directly held by Churchill Sponsor XII LLC (the "Sponsor"), and which were acquired pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and Churchill Capital Corp XII.

F2 · ownership.nature: Michael Stuart Klein, the Chief Executive Officer, President and a director of the Issuer, is the controlling shareholder of M. Klein Associates, Inc., which is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held by the Sponsor. As such, Mr. Klein may be deemed to possess beneficial ownership of the securities held directly by the Sponsor. Mr. Klein disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001628280-26-029356 · wk-form4_1777666944.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,334

F1 · kind: Represents restricted stock units which vest on the earlier of the one-year anniversary of the grant date and the date of the next regularly scheduled annual meeting of stockholders of the issuer, subject to continued service through the vesting date; provided, however, that the restricted stock units vest pro rata based on the number of days of service provided to the issuer in the event of a voluntary resignation other than when grounds for termination for cause exist.

SEC source: 0001193125-26-054778 · ownership.xml · derivative · entry 3

Klein Michael Stuart · CIK 0001327392 · Director · See Remarks · 10% owner

Churchill Sponsor X LLC · CIK 0001848787 · Director · See Remarks · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · See Remarks · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 75,000

Underlying: Common Stock · 75,000 shares

Expires 2031-02-13

F6 · price: 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.

F6 · balance_after: 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.

F5 · ownership.nature: 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.

SEC source: 0001193125-26-054778 · ownership.xml · derivative · entry 2

Klein Michael Stuart · CIK 0001327392 · Director · See Remarks · 10% owner

Churchill Sponsor X LLC · CIK 0001848787 · Director · See Remarks · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · See Remarks · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Common Stock · 10,350,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: 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"),

F2 · derivative.exercise_price: (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").

F3 · derivative.exercise_price: 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.

F1 · price: 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"),

F2 · price: (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").

F3 · price: 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.

F1 · derivative.exercise_date: 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"),

F2 · derivative.exercise_date: (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").

F3 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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"),

F2 · derivative.expiration_date: (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").

F3 · derivative.expiration_date: 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.

F5 · ownership.direct: 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.

F5 · ownership.nature: 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.

SEC source: 0001193125-26-054778 · ownership.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · See Remarks · 10% owner

Churchill Sponsor X LLC · CIK 0001848787 · Director · See Remarks · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · See Remarks · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 10,650,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: 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"),

F2 · shares: (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").

F3 · shares: 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.

F4 · shares: 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.

F1 · price: 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"),

F2 · price: (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").

F3 · price: 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.

F4 · price: 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.

F5 · ownership.nature: 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.

SEC source: 0001213900-25-123947 · ownership.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · See Remarks · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · 10% owner

CHURCHILL SPONSOR XI LLC · CIK 0002078043 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 14,300,000

F1 · shares: Represents (1) shares underlying the private placement units (each unit consisting of one Class A ordinary share and one-tenth of one warrant, each whole warrant exercisable to purchase one Class A ordinary share) directly held by Churchill Sponsor XI LLC (the "Sponsor"), and which were acquired pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and Churchill Capital Corp XI (the "Issuer"); and (2) 13,800,000 Class B ordinary shares, which shares will automatically convert into Class A ordinary shares 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. 333-291626) and the registration statement on Form S-1MEF (File No. 333-292183).

F1 · balance_after: Represents (1) shares underlying the private placement units (each unit consisting of one Class A ordinary share and one-tenth of one warrant, each whole warrant exercisable to purchase one Class A ordinary share) directly held by Churchill Sponsor XI LLC (the "Sponsor"), and which were acquired pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and Churchill Capital Corp XI (the "Issuer"); and (2) 13,800,000 Class B ordinary shares, which shares will automatically convert into Class A ordinary shares 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. 333-291626) and the registration statement on Form S-1MEF (File No. 333-292183).

F2 · ownership.nature: Michael Klein, the Chief Executive Officer, President and a director of the Issuer, is the controlling shareholder of M. Klein Associates, Inc., which is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held by the Sponsor. As such, Mr. Klein may be deemed to possess beneficial ownership of the securities held directly by the Sponsor. Mr. Klein disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001193125-25-216154 · ownership.xml · nonDerivative · entry 2

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 150,000

F2 · ownership.nature: The shares are held of record by M. Klein Associates, Inc. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.

SEC source: 0001193125-25-216154 · ownership.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 160,000

F1 · price: The shares are held of record by M. Klein Associates, Inc. Michael Klein is the controlling stockholder of M. Klein Associates, Inc. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $133.255 to $133.57, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F1 · ownership.nature: The shares are held of record by M. Klein Associates, Inc. Michael Klein is the controlling stockholder of M. Klein Associates, Inc. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $133.255 to $133.57, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0001415889-25-020036 · form4-07182025_110741.xml · derivative · entry 5

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,430

Underlying: Class A Common Stock · 12,430 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A Common Stock of the Issuer.

F2 · derivative.exercise_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

F2 · derivative.expiration_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

SEC source: 0001415889-25-020036 · form4-07182025_110741.xml · derivative · entry 4

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 20,306 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A Common Stock of the Issuer.

F2 · derivative.exercise_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

F2 · derivative.expiration_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

SEC source: 0001415889-25-020036 · form4-07182025_110741.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,906

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001104659-25-062672 · tm2519018-1_4seq1.xml · nonDerivative · entry 3

Klein Michael Stuart · CIK 0001327392 · Director

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 200,000

F3 · price: The Shares are held of record by M. Klein Associates, Inc. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.

F3 · balance_after: The Shares are held of record by M. Klein Associates, Inc. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.

F3 · ownership.nature: The Shares are held of record by M. Klein Associates, Inc. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.

SEC source: 0001104659-25-062672 · tm2519018-1_4seq1.xml · nonDerivative · entry 2

Klein Michael Stuart · CIK 0001327392 · Director

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 212,900

F2 · price: The Shares are held of record by M. Klein Associates, Inc. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.

F2 · balance_after: The Shares are held of record by M. Klein Associates, Inc. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.

F2 · ownership.nature: The Shares are held of record by M. Klein Associates, Inc. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.

SEC source: 0001104659-25-062672 · tm2519018-1_4seq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 225,000

F1 · price: 212,900 of the shares reported (the "Shares") are held of record by M. Klein Associates, Inc. and 12,100 of the Shares are held of record by Allies Capital Corp. Michael Klein is the controlling stockholder of M. Klein Associates, Inc. Michael Klein is the sole stockholder of Allies Capital Corp. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $55.2165 to $55.2248, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F1 · balance_after: 212,900 of the shares reported (the "Shares") are held of record by M. Klein Associates, Inc. and 12,100 of the Shares are held of record by Allies Capital Corp. Michael Klein is the controlling stockholder of M. Klein Associates, Inc. Michael Klein is the sole stockholder of Allies Capital Corp. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $55.2165 to $55.2248, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F1 · ownership.nature: 212,900 of the shares reported (the "Shares") are held of record by M. Klein Associates, Inc. and 12,100 of the Shares are held of record by Allies Capital Corp. Michael Klein is the controlling stockholder of M. Klein Associates, Inc. Michael Klein is the sole stockholder of Allies Capital Corp. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $55.2165 to $55.2248, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0001104659-25-061762 · tm2518684-1_4seq1.xml · nonDerivative · entry 2

Klein Michael Stuart · CIK 0001327392 · Director

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 250,000

F2 · price: 212,900 of the Shares are held of record by M. Klein Associates, Inc. and 37,100 of the Shares are held of record by Allies Capital Corp. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.. Michael Klein is the sole stockholder of Allies Capital Corp. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.920 to $63.512, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F2 · balance_after: 212,900 of the Shares are held of record by M. Klein Associates, Inc. and 37,100 of the Shares are held of record by Allies Capital Corp. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.. Michael Klein is the sole stockholder of Allies Capital Corp. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.920 to $63.512, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F2 · ownership.nature: 212,900 of the Shares are held of record by M. Klein Associates, Inc. and 37,100 of the Shares are held of record by Allies Capital Corp. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.. Michael Klein is the sole stockholder of Allies Capital Corp. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.920 to $63.512, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0001104659-25-061762 · tm2518684-1_4seq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 400,000

F1 · price: 212,900 of the shares reported (the "Shares") are held of record by M. Klein Associates, Inc. and 187,100 of the Shares are held of record by Allies Capital Corp. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.. Michael Klein is the sole stockholder of Allies Capital Corp. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.5000 to $63.6400, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F1 · balance_after: 212,900 of the shares reported (the "Shares") are held of record by M. Klein Associates, Inc. and 187,100 of the Shares are held of record by Allies Capital Corp. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.. Michael Klein is the sole stockholder of Allies Capital Corp. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.5000 to $63.6400, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

F1 · ownership.nature: 212,900 of the shares reported (the "Shares") are held of record by M. Klein Associates, Inc. and 187,100 of the Shares are held of record by Allies Capital Corp. Michael Klein is the controlling stockholder of M. Klein Associates, Inc.. Michael Klein is the sole stockholder of Allies Capital Corp. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.5000 to $63.6400, inclusive. The reporting person undertakes to provide to the registrant, any security holder of the registrant, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

SEC source: 0000950170-25-074309 · ownership.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · See Remarks · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 10,650,000

F1 · shares: Represents (1) shares underlying the private placement units (each unit consisting of one Class A ordinary share and one-quarter of one warrant, each whole warrant exercisable to purchase one Class A ordinary share) directly held by Churchill Sponsor X LLC (the "Sponsor"), and which were acquired pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and Churchill Capital Corp X (the "Issuer"); and (2) 10,350,000 Class B ordinary shares, which shares will automatically convert into Class A ordinary shares 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. 333-286799) and the registration statement on Form S-1MEF (File No. 333-287245).

F1 · balance_after: Represents (1) shares underlying the private placement units (each unit consisting of one Class A ordinary share and one-quarter of one warrant, each whole warrant exercisable to purchase one Class A ordinary share) directly held by Churchill Sponsor X LLC (the "Sponsor"), and which were acquired pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and Churchill Capital Corp X (the "Issuer"); and (2) 10,350,000 Class B ordinary shares, which shares will automatically convert into Class A ordinary shares 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. 333-286799) and the registration statement on Form S-1MEF (File No. 333-287245).

F2 · ownership.nature: Michael Klein, the Chief Executive Officer, President and a director of the Issuer, is the controlling shareholder of M. Klein Associates, Inc., which is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held by the Sponsor. As such, Mr. Klein may be deemed to possess beneficial ownership of the securities held directly by the Sponsor. Mr. Klein disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001793229-25-000095 · wk-form4_1746217933.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,357

F1 · kind: Represents restricted stock units which vest on the earlier of the one-year anniversary of the grant date and the date of the next regularly scheduled annual meeting of stockholders of the issuer, subject to continued service through the vesting date; provided, however, that the restricted stock units vest pro rata based on the number of days of service provided to the issuer in the event of a voluntary resignation other than when grounds for termination for cause exist.

SEC source: 0001104659-24-120191 · tm2428710-1_4seq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 500,000

F1 · kind: Represents pro rata distribution by AltC Sponsor LLC (the "Sponsor") to its members (the "Distribution") following the business combination of AltC Acquisition Corp. with Oklo Inc., which closed on May 9, 2024. No consideration was paid in connection with the transaction reported herein.

F1 · price: Represents pro rata distribution by AltC Sponsor LLC (the "Sponsor") to its members (the "Distribution") following the business combination of AltC Acquisition Corp. with Oklo Inc., which closed on May 9, 2024. No consideration was paid in connection with the transaction reported herein.

F2 · balance_after: 212,920 of the shares reported (the "Shares") are held of record by M. Klein Associates, Inc. and 287,100 of the Shares are held of record by Allies Capital Corp., each of which received the Shares in the Distribution. Michael Klein is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of the Sponsor. Michael Klein is the sole stockholder of Allies Capital Corp.

F2 · ownership.nature: 212,920 of the shares reported (the "Shares") are held of record by M. Klein Associates, Inc. and 287,100 of the Shares are held of record by Allies Capital Corp., each of which received the Shares in the Distribution. Michael Klein is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of the Sponsor. Michael Klein is the sole stockholder of Allies Capital Corp.

SEC source: 0001415889-24-019959 · form4-07232024_090739.xml · derivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,306

Underlying: Class A Common Stock · 20,306 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A common stock of the Issuer.

F2 · derivative.exercise_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

F2 · derivative.expiration_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

SEC source: 0001415889-24-019888 · form4-07222024_110714.xml · derivative · entry 4

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 3,750 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A common stock of the Issuer.

F3 · derivative.exercise_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

F3 · derivative.expiration_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

SEC source: 0001415889-24-019888 · form4-07222024_110714.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,600

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: All amounts of securities reported in this Form 4 reflect a 1-for-20 reverse stock split that became effective September 29, 2023.

SEC source: 0001104659-24-060612 · tm2414002-1_4seq1.xml · derivative · entry 2

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock, par value $0.0001 per share · 12,500,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · derivative.exercise_date: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · derivative.expiration_date: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and AltC Sponsor LLC (the "Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F3 · ownership.nature: The reported shares 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.

SEC source: 0001104659-24-060612 · tm2414002-1_4seq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 13,935,500

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and AltC Sponsor LLC (the "Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F3 · ownership.nature: The reported shares 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.

SEC source: 0001104659-24-077386 · tm2417538-2_4aseq1.xml · derivative · entry 2

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock, par value $0.0001 per share · 12,500,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · derivative.exercise_date: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · derivative.expiration_date: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and AltC Sponsor LLC (the "Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F3 · ownership.nature: The reported shares 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.

SEC source: 0001104659-24-077386 · tm2417538-2_4aseq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 13,950,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · price: Upon the consummation of AltC Acquisition Corp.'s business combination with Oklo Inc. on May 9, 2024 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer (formerly, AltC Acquisition Corp.) automatically converted into one share of Class A common stock, par value $0.0001 per share, of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and AltC Sponsor LLC (the "Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F3 · ownership.nature: The reported shares 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.

SEC source: 0000950170-24-055620 · ownership.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · See Remarks · 10% owner

Churchill Sponsor IX LLC · CIK 0001848785 · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 725,000

F1 · shares: Represents shares underlying units (each unit consisting of one Class A ordinary share and one-quarter of one warrant, each whole warrant exercisable to purchase one Class A ordinary share) directly held by Churchill Sponsor IX LLC (the "Sponsor"), and which were acquired pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and Churchill Capital Corp IX (the "Issuer"). Does not include 7,187,500 Class B ordinary shares, which shares will automatically convert into Class A ordinary shares 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).

F1 · balance_after: Represents shares underlying units (each unit consisting of one Class A ordinary share and one-quarter of one warrant, each whole warrant exercisable to purchase one Class A ordinary share) directly held by Churchill Sponsor IX LLC (the "Sponsor"), and which were acquired pursuant to a Private Placement Units Purchase Agreement by and between the Sponsor and Churchill Capital Corp IX (the "Issuer"). Does not include 7,187,500 Class B ordinary shares, which shares will automatically convert into Class A ordinary shares 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).

F2 · ownership.nature: Michael Klein, the Chief Executive Officer and a director of the Issuer, is the controlling shareholder of M. Klein Associates, Inc., which is the managing member of the Sponsor and has voting and investment discretion with respect to the securities held by the Sponsor. As such, Mr. Klein may be deemed to possess beneficial ownership of the securities held directly by the Sponsor. Mr. Klein disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001793229-24-000072 · wk-form4_1714166088.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 320,082

F1 · kind: Represents restricted stock units which vest on the earlier of the one-year anniversary of the grant date and the date of the next regularly scheduled annual meeting of stockholders of the issuer, subject to continued service through the vesting date; provided, however, that the restricted stock units vest pro rata based on the number of days of service provided to the issuer in the event of a voluntary resignation other than when grounds for termination for cause exist.

SEC source: 0001415889-23-011432 · form4-07242023_090748.xml · derivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Class A Common Stock · 75,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A common stock of the Issuer.

F2 · derivative.exercise_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

F2 · derivative.expiration_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

SEC source: 0001415889-23-010276 · form4-06232023_110627.xml · derivative · entry 4

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 35,398 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A common stock of the Issuer.

F2 · derivative.exercise_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

F2 · derivative.expiration_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

SEC source: 0001415889-23-010276 · form4-06232023_110627.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57,019

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001793229-23-000064 · wf-form4_168271406874937.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 147,669

F1 · kind: Represents restricted stock units which vest on the earlier of the one-year anniversary of the grant date and the date of the next regularly scheduled annual meeting of stockholders of the issuer, subject to continued service through the vesting date; provided, however, that the restricted stock units vest pro rata based on the number of days of service provided to the issuer in the event of a voluntary resignation other than when grounds for termination for cause exist.

SEC source: 0001062993-22-015431 · form4.xml · derivative · entry 5

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,398

Underlying: Class A Common Stock · 35,398 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A common stock of the Issuer.

F4 · derivative.exercise_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

F4 · derivative.expiration_date: The restricted stock units vest on the earlier of (i) the one-year anniversary of the date of grant or (ii) the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

SEC source: 0001062993-22-015431 · form4.xml · derivative · entry 4

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 21,621 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A common stock of the Issuer.

F3 · derivative.exercise_date: The restricted stock units vest on the earlier of December 28, 2022 or the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

F3 · derivative.expiration_date: The restricted stock units vest on the earlier of December 28, 2022 or the date of the Issuer's next annual meeting of stockholders following the date of grant, subject to the Reporting Person's continued service.

SEC source: 0001062993-22-015431 · form4.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,621

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001793229-22-000069 · wf-form4_165118108031477.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,287

F1 · kind: Represents restricted stock units which vest on the earlier of the one-year anniversary of the grant date and the date of the next regularly scheduled annual meeting of stockholders of the issuer, subject to continued service through the vesting date; provided, however, that the restricted stock units vest pro rata based on the number of days of service provided to the issuer in the event of a voluntary resignation other than when grounds for termination for cause exist.

SEC source: 0001104659-21-154847 · tm2136620-4_4seq1.xml · derivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,621

Underlying: Class A common stock · 21,621 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Class A common stock, par value $0.0001 per share, of the Issuer.

F2 · derivative.exercise_date: On December 28, 2021 (the "Grant Date"), the Reporting Person was granted 21,621 restricted stock units, which vest on the earlier of December 28, 2022 or the date of the Issuer's next annual meeting of stockholders following the Grant Date, subject to the Reporting Person's continued service with the Issuer.

F2 · derivative.expiration_date: On December 28, 2021 (the "Grant Date"), the Reporting Person was granted 21,621 restricted stock units, which vest on the earlier of December 28, 2022 or the date of the Issuer's next annual meeting of stockholders following the Grant Date, subject to the Reporting Person's continued service with the Issuer.

SEC source: 0001104659-21-092204 · tm2122217-1_4seq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · Chairman · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · Chairman · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · Chairman · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,435,500

F1 · ownership.nature: The reported shares of AltC Acquisition Corp. (the "Issuer") are directly held by AltC Sponsor LLC (the "Sponsor"). Michael Klein is the controlling stockholder of M. Klein Associates, Inc. which is the managing member of the Sponsor.

F2 · ownership.nature: On July 12, 2021 in connection with the Issuer's initial public offering, the Sponsor purchased from the Issuer 1,450,000 shares of Class A common stock, par value $0.0001, at a purchase price of $10.00 per share.

SEC source: 0001104659-24-077384 · tm2417538-1_4aseq1.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director · Chairman · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · Director · Chairman · 10% owner

AltC Sponsor LLC · CIK 0001849019 · Director · Chairman · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,450,000

F1 · ownership.nature: The reported shares of AltC Acquisition Corp. (the "Issuer") are directly held by AltC Sponsor LLC (the "Sponsor"). Michael Klein is the controlling stockholder of M. Klein Associates, Inc. which is the managing member of the Sponsor.

F2 · ownership.nature: On July 12, 2021 in connection with the Issuer's initial public offering, the Sponsor purchased from the Issuer 1,450,000 shares of Class A common stock, par value $0.0001, at a purchase price of $10.00 per share.

SEC source: 0000950142-21-002016 · es210159254_4-kleinmichael.xml · derivative · entry 3

Klein Michael Stuart · CIK 0001327392 · Director

M. Klein Associates, Inc. · CIK 0001751504 · 10% owner

Churchill Sponsor II LLC · CIK 0001774674 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 16,300,000

Underlying: Class A common stock · 1,500,000 shares

Expires 2026-06-11

F3 · price: In connection with the consummation of the Business Combination, the Issuer issued 1,500,000 warrants to purchase one share of Class A common stock of the Issuer, subject to adjustment pursuant to the terms of the warrants, to Sponsor in satisfaction of the $1,500,000 working capital loan from the Sponsor to the Issuer. The warrants become exercisable on July 10, 2021 and expire at 5:00 p.m., New York City time, on June 11, 2026, or earlier upon their redemption or the liquidation of the Issuer pursuant to the terms of the warrants.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and Churchill Sponsor II LLC ("Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F4 · ownership.nature: Mr. Klein has a minority interest in M. Klein & Company, LLC, and is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of Sponsor. Following the consummation of the Business Combination, the Reporting Persons own less than 10% of the outstanding Class A common stock of the Issuer. 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.

SEC source: 0000950142-21-002016 · es210159254_4-kleinmichael.xml · derivative · entry 2

Klein Michael Stuart · CIK 0001327392 · Director

M. Klein Associates, Inc. · CIK 0001751504 · 10% owner

Churchill Sponsor II LLC · CIK 0001774674 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Class A common stock · 17,250,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Upon the consummation of the Issuer's business combination with Software Luxembourg Holding S.A. on June 11, 2021 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer automatically converted into one share of Class A common stock of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · price: Upon the consummation of the Issuer's business combination with Software Luxembourg Holding S.A. on June 11, 2021 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer automatically converted into one share of Class A common stock of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · derivative.exercise_date: Upon the consummation of the Issuer's business combination with Software Luxembourg Holding S.A. on June 11, 2021 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer automatically converted into one share of Class A common stock of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F2 · derivative.expiration_date: Upon the consummation of the Issuer's business combination with Software Luxembourg Holding S.A. on June 11, 2021 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer automatically converted into one share of Class A common stock of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and Churchill Sponsor II LLC ("Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F4 · ownership.nature: Mr. Klein has a minority interest in M. Klein & Company, LLC, and is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of Sponsor. Following the consummation of the Business Combination, the Reporting Persons own less than 10% of the outstanding Class A common stock of the Issuer. 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.

SEC source: 0000950142-21-002016 · es210159254_4-kleinmichael.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

M. Klein Associates, Inc. · CIK 0001751504 · 10% owner

Churchill Sponsor II LLC · CIK 0001774674 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 17,250,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Upon the consummation of the Issuer's business combination with Software Luxembourg Holding S.A. on June 11, 2021 (the "Business Combination"), each issued and outstanding share of Class B common stock of the Issuer automatically converted into one share of Class A common stock of the Issuer pursuant to the Issuer's certificate of incorporation in effect prior to the Business Combination.

F1 · ownership.nature: This Form 4 is filed by the following Reporting Persons: Michael Stuart Klein, M. Klein Associates, Inc., and Churchill Sponsor II LLC ("Sponsor"). Because of the relationships among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests.

F4 · ownership.nature: Mr. Klein has a minority interest in M. Klein & Company, LLC, and is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of Sponsor. Following the consummation of the Business Combination, the Reporting Persons own less than 10% of the outstanding Class A common stock of the Issuer. 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.

SEC source: 0001793229-21-000037 · wf-form4_162258186126852.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,016

F1 · kind: Represents restricted stock units which vest on the earlier of the one-year anniversary of the grant date and the date of the next regularly scheduled annual meeting of stockholders of the issuer, subject to continued service through the vesting date; provided, however, that the restricted stock units vest pro rata based on the number of days of service provided to the issuer in the event of a voluntary resignation other than when grounds for termination for cause exist.

SEC source: 0001104659-20-139947 · tm2039364d4_4.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,293

F1 · kind: Represents restricted stock units which vest on the earlier of the one-year anniversary of the grant date and the date of the next regularly scheduled annual meeting of stockholders of the issuer, subject to continued service through the vesting date; provided, however, that the restricted stock units vest pro rata based on the number of days of service provided to the issuer in the event of a voluntary resignation other than when grounds for termination for cause exist.

SEC source: 0000950142-20-002862 · es2001211197_4-ccvmka.xml · derivative · entry 1

Churchill Sponsor V LLC · CIK 0001812232 · 10% owner

M. Klein Associates, Inc. · CIK 0001751504 · 10% owner

Klein Michael Stuart · CIK 0001327392 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 12,500,000

Underlying: Class A Common Stock · 437,500 shares

Expires not disclosed

F1 · derivative.exercise_price: As described in the Issuer's registration statement on Form S-1 (File No. 333-248972) under the heading "Description of Securities - Founder Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination, or at any time prior thereto at the option of the holder, on a one-for-one basis, subject to certain adjustments described therein and have no expiration date.

F2 · kind: On December 18, 2020, Churchill Sponsor V LLC forfeited at no cost 437,500 shares of common stock, par value $0.0001 per share, in connection with the determination by the underwriters of the Issuer's initial public offering not to exercise in full the over-allotment option granted to them.

F1 · derivative.exercise_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-248972) under the heading "Description of Securities - Founder Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination, or at any time prior thereto at the option of the holder, on a one-for-one basis, subject to certain adjustments described therein and have no expiration date.

F1 · derivative.expiration_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-248972) under the heading "Description of Securities - Founder Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination, or at any time prior thereto at the option of the holder, on a one-for-one basis, subject to certain adjustments described therein and have no expiration date.

F3 · ownership.nature: Churchill Sponsor V LLC is the sponsor entity of the Issuer (the "Sponsor"). Michael Klein is the controlling stockholder of M. Klein Associates, Inc., which is the managing member of Churchill Sponsor V LLC.

SEC source: 0001104659-20-126455 · tm2036308d1_form4.xml · nonDerivative · entry 1

Klein Michael Stuart · CIK 0001327392 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See note

Disclosed balance after: 30,122,711

F1 · shares: Represents shares of Class A common stock purchased by M. Klein & Company, LLC in multiple transactions at prices ranging from $6.92 to $7.20. The price reported is a weighted average price. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote (1).

F2 · balance_after: Includes shares of Class A common stock directly held by M. Klein & Company, LLC and Churchill Sponsor III, LLC.

F3 · ownership.nature: The Reporting Person has a minority interest in M. Klein & Company, LLC, and is the sole stockholder of M. Klein Associates, Inc., which is the managing member of Churchill Sponsor III, LLC. 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, the Reporting Person is the beneficial owner of any securities reported herein. The Reporting Person disclaims beneficial ownership of any securities of the Issuer except to the extent of the Reporting Person's pecuniary interest therein.