Company: HYAC-WT
Filing Date: 2025-10-14
Form Type: 8-K/A
Source: 0001104659-25-099332
Chunk: 1

Company: Haymaker Acquisition Corp. 4
Filing Date: 2025-10-14
Form: 8-K/A
Chunk 1
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 | 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 companyx

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. ¨

Introductory Note

On October 10, 2025, Haymaker Acquisition Corp.
4, a Cayman Islands exempted company (“Haymaker” or “SPAC”), filed with the U.S. Securities and Exchange Commission
(“SEC”) a Current Report on Form 8-K (the “Original Form 8-K”) in connection with Haymaker’s entry into
a Business Combination Agreement, dated as of October 9, 2025 (the “Business Combination Agreement”), by and among Haymaker,
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 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”). This Current Report on Form 8-K/A (this “Amendment”) amends the Original Form 8-K. No other amendments
are being made to the Original Form 8-K by this Amendment.

| Item 1.01 | Entry into a Material Definitive Agreement. |

Business Combination Agreement

As previously disclosed, on October 9, 2025,
Haymaker, New Suncrete, the Merger Subs and Suncrete entered into the Business Combination Agreement.

Pursuant to the Business Combination Agreement,
and subject to the terms and conditions contained therein,