Form 4 Filing for ONE Nuclear Energy Inc.

On September 23, 2026, Javier Saade, Director of the Predecessor Issuer, reported transactions related to ONE Nuclear Energy Inc. (formerly Hennessy Capital Investment Corp. VII). As part of a business combination agreement, Class B ordinary shares were converted into Class A ordinary shares on a one-for-one basis. Subsequently, the Predecessor Issuer was domesticated as a Delaware corporation, and Class A ordinary shares were converted into Successor Shares of the Successor Issuer, also on a one-for-one basis. Saade reported the acquisition of 25,000 Class A ordinary shares and the disposal of 25,000 Class B ordinary shares. These transactions, exempt from Section 16 reporting, resulted in Saade holding 25,000 Class A ordinary shares and 0 Class B ordinary shares post-transaction. Saade also has pecuniary interests through HC VII Sponsor LLC, over which he does not exercise voting or dispositive control.