Filed by NewCleo Ltd.

pursuant to Rule 425 of the Securities Act of 1933, as amended

and deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934, as amended

Subject Company: NewHold Investment Corp III

(Commission File No.: 001-42541)

The following is a translation of an excerpt from an interview with Elisabeth Rizzotti, deputy Chief Executive Officer and Chief Operating Officer of NewCleo Ltd., published on June 1, 2026, by the Italian newspaper, “La Verità”:

Question (Annalisa Corti):

You have raised more than one billion euros from private investors. What role should the state — Italian or European — play in financing next-generation nuclear power, and how much do bureaucratic delays weigh compared with Chinese and American competitors?

Answer (Elisabeth Rizzotti):

“The fundraising shows that the market believes in this technology. The role of the public sector remains essential to enable private investment, not to replace it: for every euro received from the public sector, we have raised 34 from private investors. Europe has identified the needs of the sector, but there is still no clear policy and funding plan — the Small Modular Reactors Strategy provides for up to 200 million euros in guarantees from the Innovation Fund by 2028 for all European projects, including those looking at fusion, while Newcleo alone has raised more than one billion. You see that the math does not add up? We appreciate the determination of the Italian government on this file, and I now expect the same courage in Brussels: European bureaucracy risks becoming our real competitor.”

Question (Annalisa Corti):

Why did Newcleo decide to list in the United States?

Answer (Elisabeth Rizzotti):

“The Nasdaq has always been the natural destination for those who want to innovate. It is the stock exchange in the world that raises the most capital for the development of innovative technologies. Just think of the major companies that chose it: Nvidia, Apple, Microsoft, Amazon, Google, Tesla. In the United States, the availability of capital for innovation is 100 times greater than in Europe. Given our ambition, the Nasdaq was the only suitable exchange.”

Important Additional Information Regarding the Transaction Will Be Filed With the SEC

This Form 8-K is provided for informational purposes only and contains information with respect to a proposed business combination (the “Proposed Business Combination”) between the SPAC, the Company and the Merger Subs. This Form 8-K does not constitute an offer to sell or exchange, or the solicitation of an offer to buy or exchange, any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, sale or exchange would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.

In connection with the Proposed Business Combination, the Company intends to file the Registration Statement with the SEC, which will include a proxy statement to the SPAC shareholders and a prospectus for the registration of Company securities. After the Registration Statement is declared effective by the SEC, the definitive proxy statement/prospectus and other relevant documents will be sent to all of the SPAC shareholders as of the record date to be established for voting on the Proposed Business Combination and will contain important information about the Proposed Business Combination and related matters. Shareholders of the SPAC and other interested persons are advised to read, once available, the preliminary proxy statement/prospectus and any amendments thereto and, once available, the definitive proxy statement/prospectus, in connection with the SPAC’s solicitation of proxies for its extraordinary meeting of shareholders to be held to approve, among other things, the Proposed Business Combination, because these documents will contain important information about the SPAC and the Company and the Proposed Business Combination. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act, or an exemption therefrom. The SPAC and the Company will also file other documents regarding the Proposed Business Combination with the SEC. This Form 8-K does not contain all the information that should be considered concerning the Proposed Business Combination and is not intended to form the basis of any investment decision or any other decision in respect of the Proposed Business Combination.

BEFORE MAKING ANY VOTING DECISION, INVESTORS AND SECURITY HOLDERS OF THE SPAC ARE URGED TO READ THE REGISTRATION STATEMENT, THE PROXY STATEMENT/PROSPECTUS AND ALL OTHER RELEVANT DOCUMENTS 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 THE PROPOSED BUSINESS COMBINATION.

Investors and security holders will be able to obtain free copies of the Registration Statement, the proxy statement/prospectus and all other relevant documents filed or that will be filed with the SEC by the SPAC and the Company through the website maintained by the SEC at www.sec.gov. The documents filed by the SPAC and the Company with the SEC also may be obtained free of charge upon written request to NewHold Investment Corp III, 52 Vanderbilt Avenue, Suite 2005, New York, NY 10017.

Participants in the Solicitations

The SPAC, the Company and their respective directors, executive officers, other members of management, and employees, under SEC rules, may be deemed to be participants in the solicitation of proxies from the SPAC shareholders in connection with the Proposed Business Combination. A list of the names of the directors, executive officers, other members of management and employees of the SPAC and the Company, as well as information regarding their interests in the Business Combination, will be contained in the Registration Statement to be filed with the SEC by the Company. Additional information regarding the interests of such potential participants in the solicitation process may also be included in other relevant documents when they are filed with the SEC. You may obtain free copies of these documents from the sources indicated above.

Caution About Forward-Looking Statements

This Form 8-K contains forward-looking statements for purposes of the “safe harbor” provisions under the United States Private Securities Litigation Reform Act of 1995. Any statements other than statements of historical fact contained herein are forward-looking statements and are based on beliefs and assumptions and on information currently available to the SPAC and the Company. No representations or warranties, express or implied are given in, or in respect of, this Form 8-K. These forward-looking statements are based on the SPAC’s and the Company’s expectations and beliefs concerning future events and involve risks and uncertainties that may cause actual results to differ materially from current expectations. In some cases, you can identify forward-looking statements by the following words: “may,” “will,” “could,” “would,” “should,” “expect,” “intend,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “project,” “potential,” “continue,” “ongoing,” “target,” “seek” or the negative or plural of these words, or other similar expressions that are predictions or indicate future events or prospects, although not all forward-looking statements contain these words, but the absence of these words does not mean that a statement is not forward-looking.

These forward-looking statements and factors that may cause actual results to differ materially from current expectations include, but are not limited to: the effect of the announcement or pendency of the Proposed Business Combination on the Company’s business relationships, operating results, current plans and operations of the Company; the ability to recognize the anticipated benefits of the Proposed Business Combination, which may be affected by, among other things, competition, the ability of the Company to grow and manage growth profitably; the possibility that the SPAC and/or the Company may be adversely affected by other economic, business, and/or competitive factors; estimates by the SPAC or the Company of expenses and profitability; expectations with respect to future operating and financial performance and growth, including the timing of the completion of the Proposed Business Combination; plans, intentions or future operations of the Company relating to attainment, retention or renewal of any assessments, permits, licenses or other governmental notices or approvals, or the commencement or continuation of any construction or operations of plants or facilities; the Company’s ability to execute on their business plans and strategy; and other risks and uncertainties described from time to time in filings with the SEC. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on by any investor as, a guarantee, an assurance, a prediction or a definitive statement of fact or probability.

Although each of the SPAC and the Company believes that it has a reasonable basis for each forward-looking statement contained in this Form 8-K, each of the SPAC and the Company cautions you that these statements are based on a combination of facts and factors currently known and projections of the future, which are inherently uncertain. These factors are difficult to predict accurately and may be beyond the SPAC’s and the Company’s control. In addition, there will be risks and uncertainties described in the Registration Statement relating to the Proposed Business Combination, which is expected to be filed by the Company with the SEC and other documents filed by the SPAC or the Company from time to time with the SEC. These filings may identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those expressed or implied in the forward-looking statements.

There may be additional risks that neither the SPAC nor the Company presently know or that the SPAC and the Company currently believe are immaterial that could also cause actual results to differ from those contained in the forward-looking statements. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by the SPAC or the Company, their respective directors, officers or employees or any other person that the SPAC and the Company will achieve their objectives and plans in any specified time frame, or at all. Forward-looking statements in this Form 8-K or elsewhere speak only as of the date made. New uncertainties and risks arise from time to time, and it is impossible for the SPAC or the Company to predict these events or how they may affect the SPAC or the Company. Except as required by law, neither the SPAC nor the Company has any duty to, and does not intend to, update or revise the forward-looking statements in this Form 8-K or elsewhere after the date this Form 8-K is issued. In light of these risks and uncertainties, investors should keep in mind that results, events or developments discussed in any forward-looking statement made in this Form 8-K may not occur. Uncertainties and risk factors that could affect the SPAC’s and the Company’s future performance and cause results to differ from the forward-looking statements in this Form 8-K include, but are not limited to: the occurrence of any event, change or other circumstances that could give rise to the termination of the Proposed Business Combination; the risk that the Proposed Business Combination or other business combination may not be completed by the SPAC’s business combination deadline and the potential failure to obtain an extension of the Business Combination deadline; the outcome of any legal proceedings that may be instituted against the SPAC, the Company or others following the announcement of the Proposed Business Combination; the inability to complete the Proposed Business Combination due to the failure to obtain approval of the shareholders of the SPAC or to satisfy other conditions to closing; changes to the proposed structure of the Proposed Business Combination that may be required or appropriate as a result of applicable laws or regulations; the ability to meet stock exchange listing standards following the consummation of the Proposed Business Combination; the risk that the Proposed Business Combination disrupts current plans and operations of the SPAC or the Company as a result of the announcement and consummation of the Proposed Business Combination; the ability to recognize the anticipated benefits of the Proposed Business Combination, which may be affected by, among other things, competition, the ability of the Company to grow and manage growth profitably, maintain relationships with customers and retain its management and key employees; costs related to the Proposed Business Combination; changes in applicable laws or regulations; the SPAC’s estimates of expenditures and profitability and underlying assumptions with respect to shareholder redemptions and purchase price and other adjustments; changes in laws and regulations that impact the Company; ability to enforce, protect and maintain intellectual property rights; and other risks and uncertainties set forth in the section entitled “Risk Factors” and “Cautionary Note Regarding Forward-Looking Statements” in the SPAC’s final prospectus dated February 27, 2025 relating to its initial public offering and in subsequent filings with the SEC, including the Registration Statement relating to the Proposed Business Combination expected to be filed by the Company.

No Offer or Solicitation

This Form 8-K is not a proxy statement or solicitation of a proxy, consent or authorization with respect to any securities or in respect of the Proposed Business Combination and shall not constitute an offer to sell or the solicitation of an offer to buy any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act, or an exemption therefrom.