ONE Nuclear Energy Inc.

Item Regulation 7.01 FD Disclosure. On September 23, 2026, Hennessy Capital Investment Corp. VII, a Cayman Islands exempted company (“HVII”), and ONE Nuclear Energy, LLC, a Delaware limited liability company (“ONE Nuclear”), issued a press release announcing the closing of the business combination contemplated by the Business Combination Agreement, dated as of October 22, 2025, as amended by that certain Omnibus Amendment No. 1, dated as of March 31, 2026, that certain Omnibus Amendment No. 2, dated as of June 1, 2026 and that certain Omnibus Amendment No. 3, dated as of August 7, 2026, by and among HVII, Solis Merger Sub LLC, a Delaware limited liability company, and ONE Nuclear (the “Business Combination”), pursuant to which HVII was renamed “ONE Nuclear Energy Inc.” (HVII, as renamed, “New ONE Nuclear”), and the listing of the common stock of New ONE Nuclear, par value $0.0001 per share (“New One Nuclear Common Stock”), on The Nasdaq Stock Market LLC (“Nasdaq”). New One Nuclear Common Stock is expected to commence trading on Nasdaq on September 24, 2026 under the ticker symbol “ONEN.” On September 23, 2026, Richard Taylor, Chief Executive Officer of New ONE Nuclear, presented at the Nuclear Innovation Summit investor conference. A copy of Mr. Taylor’s presentation used in connection with the Nuclear Innovation Summit is furnished as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference. The information contained under this Item 7.01 in this Report, including Exhibits 99.1 and 99.2 hereto, are being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities under that section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item Other 8.01 Items. In connection with the closing of the Business Combination, holders of 13,809,029 Class A ordinary shares sold in HVII’s initial public offering properly exercised their right to have their shares redeemed for a pro rata portion of the trust account holding the proceeds from HVII’s initial public offering. On September 23, 2026, prior to the HVII’s domestication as a Delaware corporation pursuant to the Business Combination, HVII redeemed 13,809,029 Class A ordinary shares for approximately $10.61 per share and an aggregate redemption payment of approximately $146.5 million. As a result, on September 23, 2026, after giving effect to redemptions and prepayments under HVII’s previously disclosed forward purchase agreement and before paying expenses, there was approximately $2.2 million remaining in HVII’s trust account.