Hennessy Capital Investment Corp. VII (NASDAQ:HVII) ("Hennessy VII"), and ONE Nuclear Energy LLC ("ONE Nuclear"), an independent developer of large-scale energy solutions powered by natural gas and advanced nuclear technologies, today announced the filing with the U.S. Securities and Exchange Commission ("SEC") on April 3, 2026 of an amended registration statement on Form S-4 (the "Registration Statement") in connection with their proposed business combination. The Registration Statement includes a preliminary proxy statement/prospectus and has not yet been declared effective. The filing of the amended Registration Statement represents a step toward completing the previously announced proposed business combination between Hennessy VII and ONE Nuclear. The amended Registration Statement includes updated information regarding the proposed transaction and incorporates recent developments.

This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20260407563480/en/

Concurrently with the filing of the amended Registration Statement, Hennessy VII filed an updated investor presentation, providing enhanced details about ONE Nuclear's priority development sites and illustrative development timeline and unit economics.

Hennessy VII entered into a business combination agreement with ONE Nuclear on October 23, 2025, pursuant to which, following consummation of the transaction, the combined company is expected to be listed on Nasdaq under the ticker symbol "ONEN." Completion of the transaction is subject to approval by Hennessy VII's shareholders, the Registration Statement being declared effective by the SEC, and other customary closing conditions.

ONE Nuclear is an independent developer of large-scale energy parks powered by natural gas and advanced nuclear small modular reactor (SMR) technologies. ONE Nuclear's platform is designed to deliver reliable, baseload power at scale to energy-intensive customers, including data centers, industrial users, and grid infrastructure.

The proposed transaction is expected to provide up to approximately $210 million in gross proceeds, from a combination of anticipated PIPE proceeds and up to $195 million of cash held in Hennessy VII's trust account, before accounting for potential redemptions and transaction expenses. Proceeds are expected to be used to support ONE Nuclear's development activities and to fund transaction-related costs.

The updated investor presentation is available on Hennessy VII's website at www.hennessycapital7.com and ONE Nuclear's website at www.onenuclearenergy.com. Additional information about the proposed business combination is included in the Registration Statement.

About Hennessy VII

Hennessy VII (NASDAQ:HVII) is a blank check company formed for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization, or similar business combination with one or more businesses or entities, with a focus on identifying and acquiring companies in the industrial technology and energy transition sectors. For additional information, please visit www.hennessycapital7.com.

About ONE Nuclear

ONE Nuclear is an independent developer of scalable energy solutions powered by natural gas and advanced nuclear SMR technology. ONE's approach seeks to meet rapidly growing energy demand with a fast-to-market and fully integrated platform to develop, own and operate utility-scale natural gas and advanced nuclear power generation to serve industrial and grid applications. ONE Nuclear is committed to advancing clean energy deployment through innovative nuclear technologies and strategic site development. For additional information, please visit www.onenuclearenergy.com.

Forward-Looking Statements

This press release contains forward-looking statements, including but not limited to statements regarding ONE Nuclear's and Hennessy VII's expectations, beliefs, intentions, strategies, and projections. All statements other than statements of historical facts contained in this press release are forward-looking statements. These statements are based on current expectations and assumptions and are subject to risks and uncertainties that could cause actual results to differ materially. Words such as "anticipate," "believe," "expect," "intend," "may," "plan," "project," "should," "will," and similar expressions are intended to identify forward-looking statements, though not all forward-looking statements contain these identifying words, and the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements include, without limitation, expectations of the management team of ONE Nuclear concerning the outlook for its business, productivity, plans, growth and capital investments, operational and cost performance, revenue generation, development timelines, potential generation capacities of specific sites, regulatory outlook, future market conditions, success of strategic relationships, developments in the capital and credit markets, expected future financial performance, as well as demand for nuclear energy and the economic outlook for the nuclear energy industry.

Forward-looking statements speak only as of the date of this press release and are based on ONE Nuclear's and Hennessy VII's current beliefs and assumptions. ONE Nuclear and Hennessy VII undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by law. Actual results may differ materially due to various risks and uncertainties, including but not limited to: (1) the risk that the proposed business combination may not be completed in a timely manner or at all, which may adversely affect the price of Hennessy VII's securities; (2) the failure to satisfy the conditions to the consummation of the proposed business combination, including the adoption of the definitive agreements related to the proposed business combination by the shareholders of Hennessy VII and the receipt of certain regulatory approvals; (3) market risks; (4) the occurrence of any event, change or other circumstance that could give rise to the termination of the definitive agreements related to the proposed business combination; (5) changes in transaction structure of the proposed business combination due to regulatory or legal requirements; (6) the ability to meet listing standards; (7) the effect of the announcement or pendency of the proposed business combination on ONE Nuclear's business relationships, performance, and business generally; (8) failure to realize anticipated benefits from the proposed business combination; (9) the outcome of any legal proceedings that may be instituted against ONE Nuclear or Hennessy VII related to the agreements related to the proposed business combination or the proposed business combination; (10) ONE Nuclear's ability to execute on its business plan and to develop and maintain key strategic relationships and enter into definitive agreements in connection therewith; (11) competition in ONE Nuclear's industry; (12) transaction-related costs; (13) the risk that changes in laws or regulations adversely affect ONE Nuclear's business plans and operations; (14) adverse economic or competitive conditions; (15) the level of redemptions by Hennessy VII shareholders in connection with the proposed business combination; (16) the risk that ONE Nuclear may not be able to successfully develop its exclusive sites or other sites and the commercial viability of any such site; (17) the risk that ONE Nuclear will be unable to raise additional capital to execute its business plan, which may not be available on acceptable terms or at all; and (18) other risks and uncertainties described in Hennessy VII's Annual Report on Form 10-K for the year ended December 31, 2025, which was filed with the SEC on March 6, 2026, and other filings with the SEC, including the Registration Statement, the Proxy Statement and other relevant materials filed with the SEC in connection with the proposed business combination from time to time. The foregoing list is not exhaustive, and there may be additional risks that neither Hennessy VII nor ONE Nuclear presently know or that Hennessy VII and ONE Nuclear currently believe are immaterial. ONE Nuclear and Hennessy VII caution you against placing undue reliance on forward-looking statements, which reflect current beliefs and are based on information currently available as of the date a forward-looking statement is made.

Important Information for Investors and Shareholders

In connection with the proposed business combination, Hennessy VII has filed the Registration Statement with the SEC, which includes a preliminary prospectus with respect to the securities to be issued in connection with the proposed business combination and a proxy statement to be distributed to holders of Hennessy VII's ordinary shares in connection with Hennessy VII's solicitation of proxies for the vote by Hennessy VII's shareholders with respect to the proposed business combination and other matters described in the Registration Statement (the "Proxy Statement"). After the SEC declares the Registration Statement effective, Hennessy VII plans to file the definitive Proxy Statement with the SEC and to mail copies to shareholders of Hennessy VII as of a record date to be established for voting on the proposed business combination.

This press release does not contain all the information that should be considered concerning the proposed business combination and is not a substitute for the Registration Statement, Proxy Statement or for any other document that Hennessy VII may file with the SEC. Before making any investment or voting decision, investors and security holders of Hennessy VII and ONE Nuclear are urged to read the Registration Statement and the Proxy Statement, and any amendments or supplements thereto, as well as all other relevant materials filed or that will be filed with the SEC in connection with the proposed business combination as they become available because they will contain important information about ONE Nuclear, Hennessy VII and the proposed business combination.

Investors and security holders will be able to obtain free copies of the Registration Statement on Form S-4, the Proxy Statement and all other relevant documents filed or that will be filed with the SEC by Hennessy VII through the website maintained by the SEC at www.sec.gov. In addition, the documents filed by Hennessy VII may be obtained free of charge from Hennessy VII's website at https://www.hennessycapital7.com or by directing an email request to info@hennessycapitalgroup.com. The information contained on, or that may be accessed through, the websites referenced in this press release is not incorporated by reference into, and is not a part of, this press release.

Participants in the Solicitation

Hennessy VII, ONE Nuclear and their respective directors, executive officers and other members of management and employees may, under the rules of the SEC, be deemed to be participants in the solicitations of proxies from Hennessy VII's stockholders in connection with the proposed business combination. For more information about the names, affiliations and interests of Hennessy VII's directors and executive officers, please refer to Hennessy VII's annual report on Form 10-K filed with the SEC on March 6, 2026 and the Registration Statement, the Proxy Statement and other relevant materials filed with the SEC in connection with the proposed business combination when they become available. Additional information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, which may, in some cases, be different than those of Hennessy VII's shareholders generally, are included in the Registration Statement and the Proxy Statement. Shareholders, potential investors and other interested persons should read the Registration Statement and the Proxy Statement carefully before making any voting or investment decisions. You may obtain free copies of these documents from the sources indicated above.

No Offer or Solicitation

This document shall not constitute a "solicitation" as defined in Section 14 of the Securities Exchange Act of 1934, as amended. This document shall not constitute an offer to sell or exchange, the solicitation of an offer to buy or a recommendation to purchase, any securities, or a solicitation of any vote, consent or approval, nor shall there be any sale, issuance or transfer of securities in any jurisdiction in which such offer, solicitation or sale may be unlawful under the laws of such jurisdiction. No offering of securities in the proposed business combination shall be made except by means of a prospectus meeting the requirements of the Securities Act of 1933, as amended, or an exemption therefrom.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260407563480/en/

For Investors:

Caldwell Bailey

ICR, Inc.

onenuclear@icrinc.com

For Media:

Matt Dallas

ICR, Inc.

onenuclear@icrinc.com

Hennessy Capital Investment Corp. VII and ONE Nuclear Energy LLC Announce Filing of Amended Registration Statement on Form S-4 and Updated Investor Presentation