HVII

SEC source: 0001493152-26-044000 · ownership.xml · derivative · entry 2

Saade Javier · CIK 0001837472 · Director of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A ordinary shares · 25,000 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: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.expiration_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F4 · derivative.underlying_shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-044000 · ownership.xml · nonDerivative · entry 1

Saade Javier · CIK 0001837472 · Director of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,000

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · balance_after: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-043998 · ownership.xml · derivative · entry 2

Sharma Poonam · CIK 0001855487 · Director of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A ordinary shares · 30,000 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: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through her membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.expiration_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F4 · derivative.underlying_shares: The reporting person also has pecuniary interests in securities through her membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-043998 · ownership.xml · nonDerivative · entry 1

Sharma Poonam · CIK 0001855487 · Director of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,000

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through her membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · balance_after: The reporting person also has pecuniary interests in securities through her membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-043990 · ownership.xml · derivative · entry 6

Hennessy Thomas D · CIK 0001789408 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 0

Underlying: Class A ordinary shares · 41,666 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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F6 · security: Pursuant to the Merger Agreement, in connection with, and after giving effect to, the Domestication, each then issued and outstanding right (each, a "Predecessor Right") that were automatically convertible into one-twelfth (1/12) of one Class A Ordinary Share upon consummation of the Predecessor's initial business combination converted automatically into a right to acquire one-twelfth (1/12) of one Successor Share (each, a "Successor Right"). The conversion of Predecessor Rights into Successor Rights did not alter the proportionate interests of the rights holders, and accordingly the conversion is exempt from Section 16 of the Exchange Act.

F1 · derivative.exercise_price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · derivative.exercise_price: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · kind: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · derivative.exercise_date: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · derivative.expiration_date: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Mr. Thomas Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043990 · ownership.xml · derivative · entry 5

Hennessy Thomas D · CIK 0001789408 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 0

Underlying: Class A ordinary shares · 5,203,333 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: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F5 · shares: Amount has been adjusted to reflect the forfeiture of 375,000 Class B Ordinary Shares for no further consideration on January 21, 2025, upon the expiration of the underwriters' over-allotment option, which was partially exercised in connection with the Predecessor Issuer's initial public offering. Such forfeiture was exempt from Section 16 pursuant to Rule 16b-6(d) and Rule 16a-4(d) promulgated under the Exchange Act.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.expiration_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F5 · derivative.underlying_shares: Amount has been adjusted to reflect the forfeiture of 375,000 Class B Ordinary Shares for no further consideration on January 21, 2025, upon the expiration of the underwriters' over-allotment option, which was partially exercised in connection with the Predecessor Issuer's initial public offering. Such forfeiture was exempt from Section 16 pursuant to Rule 16b-6(d) and Rule 16a-4(d) promulgated under the Exchange Act.

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Mr. Thomas Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043990 · ownership.xml · derivative · entry 4

Hennessy Thomas D · CIK 0001789408 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A ordinary shares · 750,000 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: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.expiration_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

SEC source: 0001493152-26-043990 · ownership.xml · nonDerivative · entry 3

Hennessy Thomas D · CIK 0001789408 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 5,744,999

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · kind: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · price: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Mr. Thomas Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043990 · ownership.xml · nonDerivative · entry 2

Hennessy Thomas D · CIK 0001789408 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 5,703,333

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Mr. Thomas Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043990 · ownership.xml · nonDerivative · entry 1

Hennessy Thomas D · CIK 0001789408 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 750,000

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

SEC source: 0001493152-26-043988 · ownership.xml · derivative · entry 4

HENNESSY DANIEL J · CIK 0001519536 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 0

Underlying: Class A ordinary shares · 41,666 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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F6 · security: Pursuant to the Merger Agreement, in connection with, and after giving effect to, the Domestication, each then issued and outstanding right (each, a "Predecessor Right") that were automatically convertible into one-twelfth (1/12) of one Class A Ordinary Share upon consummation of the Predecessor's initial business combination converted automatically into a right to acquire one-twelfth (1/12) of one Successor Share (each, a "Successor Right"). The conversion of Predecessor Rights into Successor Rights did not alter the proportionate interests of the rights holders, and accordingly the conversion is exempt from Section 16 of the Exchange Act.

F1 · derivative.exercise_price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · derivative.exercise_price: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · kind: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · derivative.exercise_date: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · derivative.expiration_date: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Mr. Daniel Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043988 · ownership.xml · derivative · entry 3

HENNESSY DANIEL J · CIK 0001519536 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 0

Underlying: Class A ordinary shares · 5,203,333 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: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F5 · shares: Amount has been adjusted to reflect the forfeiture of 375,000 Class B Ordinary Shares for no further consideration on January 21, 2025, upon the expiration of the underwriters' over-allotment option, which was partially exercised in connection with the Predecessor Issuer's initial public offering. Such forfeiture was exempt from Section 16 pursuant to Rule 16b-6(d) and Rule 16a-4(d) promulgated under the Exchange Act.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.expiration_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F5 · derivative.underlying_shares: Amount has been adjusted to reflect the forfeiture of 375,000 Class B Ordinary Shares for no further consideration on January 21, 2025, upon the expiration of the underwriters' over-allotment option, which was partially exercised in connection with the Predecessor Issuer's initial public offering. Such forfeiture was exempt from Section 16 pursuant to Rule 16b-6(d) and Rule 16a-4(d) promulgated under the Exchange Act.

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Mr. Daniel Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043988 · ownership.xml · nonDerivative · entry 2

HENNESSY DANIEL J · CIK 0001519536 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 5,744,999

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · kind: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · price: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Mr. Daniel Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043988 · ownership.xml · nonDerivative · entry 1

HENNESSY DANIEL J · CIK 0001519536 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 5,703,333

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Mr. Daniel Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043985 · ownership.xml · derivative · entry 4

HC VII Sponsor LLC · CIK 0001851746 · See Remarks

Hennessy Capital Group LLC · CIK 0001597166 · See Remarks

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 0

Underlying: Class A ordinary shares · 41,666 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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F6 · security: Pursuant to the Merger Agreement, in connection with, and after giving effect to, the Domestication, each then issued and outstanding right (each, a "Predecessor Right") that were automatically convertible into one-twelfth (1/12) of one Class A Ordinary Share upon consummation of the Predecessor's initial business combination converted automatically into a right to acquire one-twelfth (1/12) of one Successor Share (each, a "Successor Right"). The conversion of Predecessor Rights into Successor Rights did not alter the proportionate interests of the rights holders, and accordingly the conversion is exempt from Section 16 of the Exchange Act.

F1 · derivative.exercise_price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · derivative.exercise_price: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · kind: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · derivative.exercise_date: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · derivative.expiration_date: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Each of Mr. Daniel Hennessy and Mr. Thomas Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043985 · ownership.xml · derivative · entry 3

HC VII Sponsor LLC · CIK 0001851746 · See Remarks

Hennessy Capital Group LLC · CIK 0001597166 · See Remarks

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 0

Underlying: Class A ordinary shares · 5,203,333 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: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F5 · shares: Amount has been adjusted to reflect the forfeiture of 375,000 Class B Ordinary Shares for no further consideration on January 21, 2025, upon the expiration of the underwriters' over-allotment option, which was partially exercised in connection with the Predecessor Issuer's initial public offering. Such forfeiture was exempt from Section 16 pursuant to Rule 16b-6(d) and Rule 16a-4(d) promulgated under the Exchange Act.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.expiration_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F5 · derivative.underlying_shares: Amount has been adjusted to reflect the forfeiture of 375,000 Class B Ordinary Shares for no further consideration on January 21, 2025, upon the expiration of the underwriters' over-allotment option, which was partially exercised in connection with the Predecessor Issuer's initial public offering. Such forfeiture was exempt from Section 16 pursuant to Rule 16b-6(d) and Rule 16a-4(d) promulgated under the Exchange Act.

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Each of Mr. Daniel Hennessy and Mr. Thomas Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043985 · ownership.xml · nonDerivative · entry 2

HC VII Sponsor LLC · CIK 0001851746 · See Remarks

Hennessy Capital Group LLC · CIK 0001597166 · See Remarks

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 5,744,999

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · kind: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F7 · price: Pursuant to the Merger Agreement, each twelve Successor Rights were automatically surrendered in exchange for one Successor Share at the Closing.

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Each of Mr. Daniel Hennessy and Mr. Thomas Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043985 · ownership.xml · nonDerivative · entry 1

HC VII Sponsor LLC · CIK 0001851746 · See Remarks

Hennessy Capital Group LLC · CIK 0001597166 · See Remarks

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Explanation of Responses

Disclosed balance after: 5,703,333

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · ownership.nature: HC VII Sponsor LLC ("Sponsor") is the record holder of the securities reported herein. Hennessy Capital Group LLC is the sole manager of Sponsor. Daniel J. Hennessy, the Predecessor Issuer's Chairman and Chief Executive Officer, and Thomas D. Hennessy, the Predecessor Issuer's President, Chief Operating Officer and a director, are the sole managing members of Hennessy Capital Group LLC. Consequently, each of Mr. Daniel Hennessy and Mr. Thomas Hennessy may be deemed the beneficial owner of securities held by Sponsor and have shared voting and dispositive control over such securities. Each of Mr. Daniel Hennessy and Mr. Thomas Hennessy disclaims beneficial ownership over any securities owned by Sponsor in which he does not have any pecuniary interest.

SEC source: 0001493152-26-043983 · ownership.xml · derivative · entry 2

Geeza Nicholas Boris · CIK 0001974770 · CFO of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A ordinary shares · 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.

F1 · derivative.exercise_price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.expiration_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F4 · derivative.underlying_shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-043983 · ownership.xml · nonDerivative · entry 1

Geeza Nicholas Boris · CIK 0001974770 · CFO of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 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.

F1 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · balance_after: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-043980 · ownership.xml · derivative · entry 2

BRUNELLE ANNA S. · CIK 0001445390 · Director of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A ordinary shares · 25,000 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: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through her membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.expiration_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F4 · derivative.underlying_shares: The reporting person also has pecuniary interests in securities through her membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-043980 · ownership.xml · nonDerivative · entry 1

BRUNELLE ANNA S. · CIK 0001445390 · Director of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,000

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through her membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · balance_after: The reporting person also has pecuniary interests in securities through her membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-043978 · ownership.xml · derivative · entry 2

Bonner Brian · CIK 0001699200 · Director of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A ordinary shares · 25,000 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: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.expiration_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F4 · derivative.underlying_shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-043978 · ownership.xml · nonDerivative · entry 1

Bonner Brian · CIK 0001699200 · Director of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,000

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · balance_after: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-043976 · ownership.xml · derivative · entry 2

Allen Grant R · CIK 0001855598 · Director of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A ordinary shares · 25,000 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: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · derivative.exercise_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.exercise_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.expiration_date: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · derivative.expiration_date: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F1 · derivative.underlying: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · derivative.underlying: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F4 · derivative.underlying_shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

SEC source: 0001493152-26-043976 · ownership.xml · nonDerivative · entry 1

Allen Grant R · CIK 0001855598 · Director of Predecessor Issuer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,000

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 · security: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F3 · security: Pursuant to the Merger Agreement, immediately after the Sponsor Share Conversion, the Predecessor Issuer transferred by way of continuation and deregistration to and domesticated as a Delaware corporation (such continuation and domestication, the "Domestication"). In connection with, and after giving effect to, the Domestication, each then issued and outstanding Class A Ordinary Share converted automatically, on a one-for-one basis, into one share of common stock, par value $0.0001 per share, of the Successor Issuer (each, a "Successor Share"), and the Successor Issuer became the successor issuer to the Predecessor Issuer. The conversion of the Class A Ordinary Shares into Successor Shares did not alter the proportionate interests of the security holders, and accordingly the conversion is exempt from Section 16 of the Securities Exchange Act of 1934, as amended.

F1 · kind: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · kind: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · shares: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.

F1 · price: Pursuant to the business combination agreement dated October 22, 2025 (the "Merger Agreement"), among other things, at the closing of the transactions contemplated thereby (the "Closing," and the date on which the Closing occurred, the "Closing Date") and following the Domestication (as defined below), Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company with limited liability (the "Predecessor Issuer"), was renamed "ONE Nuclear Energy Inc." ("Successor Issuer") and consummated its initial business combination with ONE Nuclear Energy LLC, a Delaware limited liability company ("ONE Nuclear"), with ONE Nuclear being the surviving company. Following the Closing, ONE Nuclear became a direct wholly-owned subsidiary of the Successor Issuer.

F2 · price: Pursuant to the Merger Agreement, on the Closing Date prior to the Closing, each then issued and outstanding Class B ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class B Ordinary Share") converted (the "Sponsor Share Conversion") automatically, on a one-for-one basis, into one Class A ordinary share, par value $0.0001 per share, of the Predecessor Issuer (each a "Class A Ordinary Share").

F4 · balance_after: The reporting person also has pecuniary interests in securities through his membership interest in HC VII Sponsor LLC, over which the reporting person does not have voting or dispositive control.