Company: HYAC-WT
Filing Date: 2025-10-21
Form Type: 425
Source: 0001104659-25-101289
Chunk: 1

Company: Haymaker Acquisition Corp. 4
Filing Date: 2025-10-21
Form: 425
Chunk 1
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, 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. ¨

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.”

On October 21, 2025, Suncrete and Haymaker issued
a joint press release announcing that Suncrete completed its acquisition of SRM, Inc. (d.b.a. Schwarz Ready Mix) and SRM Leasing, LLC
and all of the issued and outstanding equity interests of Schwarz Sand, LLC (such assets and equity interests, collectively, “Schwarz”),
which companies collectively run a ready-mix concrete business in Oklahoma City, Oklahoma, and the surrounding areas. A copy of the press
release is furnished as Exhibit 99.1 and incorporated herein by reference.

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