Company: HYAC-WT
Filing Date: 2025-07-15
Form Type: DEFA14A
Source: 0001104659-25-068092
Chunk: 6

Company: Haymaker Acquisition Corp. 4
Filing Date: 2025-07-15
Form: DEFA14A
Chunk 6
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 Company filed, or to be filed, with the SEC. The Company does not undertake any obligation to update or revise any forward-looking
statements, whether as a result of new information, future events or otherwise, except as required by law.

| Item 9.01 | Financial Statements and Exhibits |

(d) Exhibits

| Exhibit 
 Number  |     | Title                                                                                             |
| 10.1    |     | Form of Promissory Note, by and between Haymaker Acquisition Corp. 4 and Haymaker Sponsor IV LLC. |
| 104     |     | Cover Page Interactive Data File.                                                                 |

<div align='center'>SIGNATURE</div>

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

| HAYMAKER ACQUISITION CORP. 4 |

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

Date: July 15, 2025

Exhibit 10.1

THIS PROMISSORY NOTE (THIS “NOTE”) HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

<div align='center'>FORM OF PROMISSORY NOTE</div>

| Principal Amount: Up to US$4,500,000 |     | Dated as of July [●], 2025 |

Haymaker Acquisition Corp.
4, a Cayman Islands exempted company and blank check company (the “Maker”), promises to pay to the order of Haymaker
Sponsor IV LLC, or its registered assigns or successors in interest (the “Payee”), the entire unpaid Principal Amount
(as defined below) of up to Four Million Five Hundred Thousand U.S. Dollars (US$4,500,000) in lawful money of the United States of America,
on the terms and conditions described below. All payments on this Note shall be made by check or wire