Mizuho reports 5.3% Haymaker Acquisition Corp. 4 (HYAC) ownership stake

Rhea-AI Filing Summary

Mizuho Financial Group, Inc. reported beneficial ownership of 1,249,126 common shares of Haymaker Acquisition Corp. 4, representing 5.3% of the class. Mizuho has sole power to vote and dispose of these shares, with no shared voting or dispositive power.

The shares are directly held by Mizuho Securities USA LLC, a wholly owned subsidiary, and Mizuho is reporting as a parent holding company. Mizuho states the position was acquired and is held in the ordinary course of business, not to change or influence control of Haymaker Acquisition Corp. 4.

Insights

Equity ownership and disclosure analyst

Mizuho discloses a 5.3% ordinary-course stake in HYAC.

Mizuho Financial Group, Inc. has disclosed beneficial ownership of 1,249,126 common shares of Haymaker Acquisition Corp. 4, equal to 5.3% of the outstanding class. The group reports sole voting and dispositive power, with the position held through its wholly owned subsidiary Mizuho Securities USA LLC.

The ownership is described as acquired and held in the ordinary course of business, with an explicit statement that it is not intended to change or influence control of Haymaker Acquisition Corp. 4. This makes the disclosure primarily informational, indicating a meaningful but non-controlling institutional stake.

Mizuho is classified as a parent holding company and certifies that its foreign regulatory framework is comparable to that of a functionally equivalent U.S. institution. Subsequent ownership reports would clarify whether this 5.3% stake grows, shrinks, or remains stable over time.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Haymaker Acquisition Corp. 4

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G4375F108

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. G4375F108

1

Names of Reporting Persons

Mizuho Financial Group, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

JAPAN

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,249,126.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,249,126.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,249,126.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.3 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: Mizuho Financial Group, Inc., Mizuho Bank, Ltd. and Mizuho Americas LLC may be deemed to be indirect beneficial owners of said equity securities directly held by Mizuho Securities USA LLC which is their wholly-owned subsidiary.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Haymaker Acquisition Corp. 4
(b)	Address of issuer's principal executive offices: 501 MADISON AVENUE FLOOR 5, NEW YORK, NY 10022
Item 2.
(a)	Name of person filing: Mizuho Financial Group, Inc.
(b)	Address or principal business office or, if none, residence: 1-5-5, Otemachi, Chiyoda-ku, Tokyo, 100-8176, Japan
(c)	Citizenship: Japan
(d)	Title of class of securities: Common Shares
(e)	CUSIP No.: G4375F108
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
	Parent Holding Company
Item 4.	Ownership
(a)	Amount beneficially owned: 1,249,126
(b)	Percent of class: 5.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,249,126
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,249,126
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit A
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. By signing below I certify that, to the best of my knowledge and belief, the foreign regulatory scheme applicable to Parent Holding Company is substantially comparable to the regulatory scheme applicable to the functionally equivalent U.S. institution(s). I also undertake to furnish to the Commission staff, upon request, information that would otherwise be disclosed in a Schedule 13D.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Mizuho Financial Group, Inc.

Signature:	/s/ Takahiro Katsura
Name/Title:	Takahiro Katsura, Managing Director, Global Corporate Function Coordination Department
Date:	02/12/2026

FAQ

What stake does Mizuho Financial Group hold in Haymaker Acquisition Corp. 4 (HYAC)?

Mizuho Financial Group beneficially owns 1,249,126 common shares of Haymaker Acquisition Corp. 4, representing 5.3% of the outstanding class. Mizuho reports sole voting and dispositive power over these shares through its wholly owned subsidiary Mizuho Securities USA LLC.

How much voting power does Mizuho Financial Group have in HYAC?

Mizuho Financial Group reports sole voting power over 1,249,126 common shares of Haymaker Acquisition Corp. 4 and no shared voting power. It also has sole dispositive power over the same number of shares, indicating full control over how this 5.3% stake is voted and disposed.

Is Mizuho’s 5.3% HYAC ownership intended to influence control of the company?

Mizuho states the HYAC securities were acquired and are held in the ordinary course of business. It certifies they were not acquired and are not held for the purpose or effect of changing or influencing control of Haymaker Acquisition Corp. 4.

Which Mizuho entity directly holds the HYAC shares reported in this Schedule 13G?

The Schedule 13G explains that the equity securities are directly held by Mizuho Securities USA LLC, which is a wholly owned subsidiary. Mizuho Financial Group, Mizuho Bank, Ltd., and Mizuho Americas LLC may be deemed indirect beneficial owners of these HYAC common shares.

How is Mizuho Financial Group classified in this HYAC ownership report?

Mizuho Financial Group is classified as a parent holding company for this ownership report. It also certifies that the foreign regulatory scheme applicable to it is substantially comparable to that of functionally equivalent U.S. institutions, supporting its use of the Schedule 13G framework.

What type of securities of HYAC are covered by Mizuho’s 13G filing?

The disclosure covers common shares of Haymaker Acquisition Corp. 4, identified by CUSIP G4375F108. Mizuho reports beneficial ownership of 1,249,126 of these common shares, equal to 5.3% of that class, with sole voting and dispositive authority over the position.