SEC Form 425 filed by Haymaker Acquisition Corp. 4

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): December 10, 2025

HAYMAKER ACQUISITION CORP. 4

(Exact Name of Registrant as Specified in Charter)

(212) 616-9600

(Registrant’s Telephone Number, Including Area Code)

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company x

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 7.01 Regulation FD Disclosure.

As previously reported, on October 9, 2025, Haymaker Acquisition Corp. 4, a Cayman Islands exempted company (“Haymaker”), Suncrete, Inc., a Delaware corporation and direct wholly owned subsidiary of Haymaker (“PubCo”), Haymaker Merger Sub I, Inc., a Delaware corporation and direct wholly owned subsidiary of PubCo, Haymaker Merger Sub II, LLC, a Delaware limited liability company and direct wholly owned subsidiary of PubCo, and Concrete Partners Holding, LLC, a Delaware limited liability company (“Suncrete”), entered into a business combination agreement (the “Business Combination Agreement”). The transactions contemplated by the Business Combination Agreement are hereinafter referred to collectively as the “Business Combination.”

Attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated into this Item 7.01 by reference is the investor presentation (the “Investor Presentation”) that may be used by Haymaker and Suncrete in connection with the transactions contemplated by the Business Combination Agreement.

The foregoing (including Exhibit 99.1) is being furnished pursuant to Item 7.01 and will not be deemed to be filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise be subject to the liabilities of that section, nor will it be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act.

Additional Information and Where To Find It

In connection with the Business Combination, PubCo and Suncrete have filed with the United States Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4 (the “Registration Statement”), which includes a proxy statement with respect to Haymaker’s shareholder meeting to vote on the Business Combination and a prospectus with respect to PubCo’s securities to be issued in connection with the Business Combination (the “proxy statement/prospectus”), as well as other relevant documents concerning the Business Combination. After the Registration Statement is declared effective by the SEC, the definitive proxy statement/prospectus included in the Registration Statement will be mailed to the shareholders of Haymaker as of the record date to be established for voting on the Business Combination. INVESTORS AND SHAREHOLDERS OF HAYMAKER ARE URGED TO READ CAREFULLY AND IN THEIR ENTIRETY THE PROXY STATEMENT/PROSPECTUS REGARDING THE BUSINESS COMBINATION, AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THOSE DOCUMENTS BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. Investors and shareholders can to obtain a free copy of the proxy statement/prospectus, as well as other filings containing information about PubCo, Haymaker and Suncrete, without charge, at the SEC’s website, http://www.sec.gov.

No Offer or Solicitation

This Current Report on Form 8-K (this “Report”) shall not constitute a solicitation of a proxy, consent, or authorization with respect to any securities or in respect of the Business Combination. This Report shall also not constitute an offer to subscribe for, buy or sell, the solicitation of an offer to subscribe for, buy or sell or an invitation to subscribe for, buy or sell any securities or the solicitation of any vote or approval in any jurisdiction pursuant to or in connection with the proposed transactions or otherwise, nor shall there be any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act, and otherwise in accordance with applicable law.

Participants in Solicitation

Haymaker, PubCo and their respective directors, executive officers and certain other members of management and employees may be deemed under SEC rules to be participants in the solicitation of proxies from Haymaker’s shareholders in connection with the Business Combination. Information regarding the persons who may be considered participants in the solicitation of proxies in connection with the proposed Business Combination, including a description of their direct or indirect interests, by security holdings or otherwise, is set forth in the proxy statement/prospectus and other relevant materials filed with the SEC. Information regarding the directors and executive officers of Haymaker is set forth in Part II, Item 10. Directors, Executive Officers and Corporate Governance of Haymaker’s Annual Report on Form 10-K for the year ended December 31, 2024. These documents can be obtained free of charge from the sources indicated above.

Cautionary Statement Regarding Forward-Looking Statements

Certain statements herein and the documents incorporated herein by reference may constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act, and Rule 175 promulgated thereunder, and Section 21E of the Exchange Act, and Rule 3b-6 promulgated thereunder, which statements involve inherent risks and uncertainties.

Examples of forward-looking statements include, but are not limited to, statements with respect to the expectations, hopes, beliefs, intentions, plans, prospects, financial results of strategies regarding Haymaker, Suncrete, PubCo, the Business Combination and statements regarding the anticipated benefits and timing of the completion of the proposed Business Combination and PIPE investment, plans and use of proceeds, objectives of management for future operations of Suncrete, expected operating costs of Suncrete and its subsidiaries, the upside potential and opportunity for investors, Suncrete’s plan for value creation and strategic advantages, market site and growth opportunities, Suncrete’s acquisition strategy, regulatory conditions, competitive position and the interest of other corporations in similar business strategies, technological and market trends, future financial condition and performance and expected financial impacts of the Business Combination, the satisfaction of closing conditions to the Business Combination and the PIPE investment and the level of redemptions of Haymaker’s public shareholders, and PubCo’s, Suncrete’s and Haymaker’s expectations, intentions, strategies, assumptions or beliefs about future events, results at operations or performance or that do not solely relate to historical or current facts. These forward-looking statements generally are identified by the words “believe,” “project,” “expect,” “anticipate,” “estimate,” “intend,” “strategy,” “future,” “opportunity,” “potential,” “plan,” “may,” “should,” “will,” “would,” “will be,” “will continue,” “will likely result,” and similar expressions. Forward-looking statements are based on assumptions as of the time they are made and are subject to risks, uncertainties and other factors that are difficult to predict with regard to timing, extent, likelihood and degree of occurrence, which could cause actual results to differ materially from anticipated results expressed or implied by such forward-looking statements. Such risks, uncertainties and assumptions, include, but are not limited to:

The foregoing list of risk factors is not exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties described in the “Risk Factors” section Haymaker’s Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, and the Registration Statement and proxy statement/prospectus filed by PubCo and Suncrete, and other documents filed or to be filed by PubCo, Haymaker and Suncrete from time to time with the SEC. These filings do or will identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained in the forward-looking statements. There may be additional risks that none of PubCo, Suncrete or Haymaker presently know or currently believe are immaterial that could also cause actual results to differ materially from those contained in the forward-looking statements. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and none of the parties or any of their representatives assumes any obligation or intends to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise. None of the parties or any of their representatives gives any assurance that PubCo, Suncrete or Haymaker will achieve its expectations.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Current Report to be signed on its behalf by the undersigned hereunto duly authorized.