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): October 9, 2025

HAYMAKER ACQUISITION CORP. 4

(Exact Name of Registrant as Specified in Charter)


Cayman Islands	001-41757	87-2213850
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

324 Royal Palm Way, Suite 300-i

Palm Beach, FL 33480

(Address of Principal Executive Offices) (Zip Code)

(212) 616-9600

(Registrant’s Telephone Number, Including Area Code)

501 Madison Avenue, Floor 5

New York, NY 10022

(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:

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e 4(c))

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant	HYACU	The New York Stock Exchange

Class A ordinary shares, par value $0.0001 per share	HYAC	The New York Stock Exchange

Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share	HYAC WS	The New York Stock Exchange

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 1.01

Entry into a Material Definitive Agreement.

On October 9, 2025, Haymaker Acquisition Corp. 4, a Cayman Islands exempted company (“Haymaker” or “SPAC”), Suncrete, Inc., a Delaware corporation and direct wholly owned subsidiary of SPAC (“New Suncrete” or “PubCo”), Haymaker Merger Sub I, Inc., a Delaware corporation and a direct wholly owned subsidiary of PubCo (“Merger Sub I”), Haymaker Merger Sub II, LLC, a Delaware limited liability company and direct wholly owned subsidiary of PubCo (“Merger Sub II” and together with Merger Sub I, the “Merger Subs”), and Concrete Partners Holding, LLC, a Delaware limited liability company (“Suncrete”), entered into a Business Combination Agreement, dated as of October 9, 2025 (the “Business Combination Agreement”).

Pursuant to the Business Combination Agreement, and subject to the terms and conditions contained therein, the Business Combination will be effected in three steps: (a) SPAC will change its jurisdiction of incorporation from the Cayman Islands to the State of Delaware (the “Domestication” and the time at which the Domestication becomes effective, the “Domestication Effective Time”), (b) immediately following the Domestication Effective Time, Merger Sub I will merge with and into SPAC (the “Initial Merger”), with SPAC surviving the Initial Merger as a wholly owned subsidiary of PubCo (the time at which the Initial Merger becomes effective, the “Initial Merger Effective Time”); and (c) immediately following the Initial Merger Effective Time, Merger Sub II will merge with and into Suncrete (the “Acquisition Merger” and, together with the Initial Merger, the “Mergers”, and collectively with the Domestication and all other transactions contemplated by the Business Combination Agreement, the “Business Combination”), with Suncrete surviving the Acquisition Merger as a wholly owned subsidiary of New Suncrete.

The Business Combination Agreement is subject to the satisfaction or waiver of certain customary closing conditions, including, among others, the requisite approval of the Business Combination Agreement and the transactions contemplated thereby by Haymaker’s equityholders and certain of Suncrete’s equityholders.

Concurrently with the execution and delivery of the Business Combination Agreement, Suncrete, PubCo, SPAC and certain equityholders of Suncrete entered into support agreements (the “Company Equityholder Support Agreements”), pursuant to which the equityholders of Suncrete party thereto agreed, among other things, to vote in favor of the approval and adoption of the Business Combination and the transactions contemplated thereby. Further, such equityholders of Suncrete, as well as Suncrete’s majority equityholder, have agreed to certain customary lock-up restrictions with respect to their Suncrete securities, as well as any securities of PubCo issued to such holders pursuant to the Business Combination Agreement, in each case subject to certain exceptions.

Concurrently with the execution and delivery of the Business Combination Agreement, the Sponsor and certain officers and directors of SPAC (such holders, the “Sponsor Related Parties”) entered into an agreement (the “Sponsor Support Agreement”) with Suncrete and PubCo, which supersedes the letter agreement dated July 25, 2023, among the SPAC, the Sponsor and the Sponsor Related Parties. Pursuant to the Sponsor Support Agreement, among other things, the Sponsor and the Sponsor Related Parties agreed to vote in favor of the adoption and approval of the Business Combination Agreement and the transactions contemplated thereby and waive the anti-dilution rights set forth in SPAC’s organizational documents. The Sponsor and the Sponsor Related Parties also agreed to certain customary lock-up restrictions with respect to their SPAC securities, as well as any securities of PubCo issued to the Sponsor Related Parties pursuant to the Business Combination Agreement, in each case subject to certain exceptions.

Concurrently with the execution and delivery of the Business Combination Agreement, SPAC and PubCo entered into subscription agreements (the “Subscription Agreements”) with certain accredited investors and qualified institutional buyers (collectively, the “PIPE Investors”), pursuant to which, among other things, PubCo agreed to issue and sell to the PIPE Investors, in a private placement to close immediately prior to the closing of the Acquisition Merger, an aggregate of approximately $82.5 million in shares of PubCo Class A Common Stock and, in certain circumstances, Pre-Funded Common Stock Purchase Warrants to purchase PubCo Class A Common Stock (the “PIPE Investment”).

Copies of the Business Combination Agreement, the Company Equityholder Support Agreement, the Sponsor Support Agreement and the form of Subscription Agreement will be filed by an amendment on Form 8-K/A to this Current Report (this “Report”) within four business days of October 9, 2025, and the foregoing descriptions of each of such agreements are qualified in their entirety by reference thereto.

Item 7.01

Regulation FD Disclosure.

On October 9, 2025, the parties jointly issued a press release announcing the execution of the Business Combination Agreement. A copy of the press release is furnished herewith as Exhibit 99.1 and is incorporated by reference herein. Exhibit 99.2 furnished herewith and incorporated by reference herein is an investor presentation that may be used by SPAC and PubCo in connection with the Business Combination.

The information in this Item 7.01, including Exhibits 99.1 and 99.2, is 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 liabilities under that section, and shall not be deemed to be incorporated by reference into the filings of SPAC under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filings. This Report will not be deemed an admission as to the materiality of any of the information in this Item 7.01, including Exhibits 99.1 and 99.2.

Additional Information and Where To Find It

In connection with the Business Combination, PubCo and Suncrete intend to file with the United States Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4, which will include 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 WHEN IT BECOMES AVAILABLE, 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 will be able to obtain a free copy of the proxy statement/prospectus, as well as other filings containing information about PubCo, Haymaker and Suncrete, without charge, once available, at the SEC’s website, http://www.sec.gov.

No Offer or Solicitation

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

Each of 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, will be set forth in the proxy statement/prospectus and other relevant materials when they are 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 risk that the Business Combination and the PIPE Investment may not be completed in a timely manner or at all;

the failure by the parties to satisfy the conditions to the consummation of the PIPE Investment and the Business Combination, including the approval of Haymaker’s shareholders;

the failure to realize the anticipated benefits of the Business Combination;

the outcome of any potential legal proceedings that may be instituted against PubCo, Suncrete, Haymaker or others following announcement of the Business Combination;

the level of redemptions of Haymaker’s public shareholders which may reduce the public float of, reduce the liquidity of the trading market of, and/or maintain the quotation, listing, or trading of the Class A ordinary shares of Haymaker or the shares of PubCo Class A Common Stock;

the failure of PubCo to obtain or maintain the listing of its securities on any stock exchange on which the PubCo Class A Common Stock will be listed after closing of the Business Combination;

costs related to the Business Combination and as a result of PubCo becoming a public company;

changes in business, market, financial, political and regulatory conditions;

risks relating to Suncrete’s anticipated operations and business, including the success of any future acquisitions;

the risk that issuances of equity or debt securities following the closing of the Business Combination, including issuances of equity securities in connection with Suncrete’s acquisition strategy, may adversely affect the value of Suncrete’s common stock and dilute its stockholders;

the risk that after consummation of the Business Combination, PubCo experiences difficulties managing its growth and expanding operations;

challenges in implementing the business plan, due to lack of an operating history, operational challenges, significant competition and regulation;

those risk factors discussed in documents of PubCo, Haymaker or Suncrete filed, or to be filed, with the SEC.

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 on Form S-4 and proxy statement/prospectus that will be 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 and does not intend 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.


Exhibit Number		Description

99.1		Press Release, dated October 9, 2025

99.2		Investor Presentation

104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

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.


	Haymaker Acquisition Corp. 4

October 10, 2025

	By:	/s/ Christopher Bradley
	Name:	Christopher Bradley
	Title:	Chief Executive Officer and Chief Financial Officer

Haymaker Acquisition Corp. 4 8-K