Mizuho Discloses 550,000-Share, 8.9% Position in Eureka Acquisition Corp

Rhea-AI Filing Summary

Mizuho Financial Group, Inc. filed an amended Schedule 13G disclosing a material passive stake in Eureka Acquisition Corp common shares G32168109). The filing reports beneficial ownership of 550,000 shares, representing 8.9% of the class, with sole voting and dispositive power over those shares.

The submission indicates Mizuho is a parent holding company and notes that Mizuho Securities USA LLC may be deemed indirect beneficial owners of the securities. The filer certifies the holdings were acquired and are held in the ordinary course of business and not for purposes of changing control. The form is signed by Takahiro Katsura on 08/13/2025 and references an Exhibit A for subsidiary identification.

Positive

• Material passive stake disclosed: 550,000 shares representing 8.9% of the class
• Sole voting and dispositive power: Mizuho reports exclusive control over voting and disposition of the reported shares
• Certification of ordinary-course holdings: filer states shares are held in the ordinary course and not to change control
• Signed and dated filing: signature by Takahiro Katsura on 08/13/2025

Negative

• Exhibit A referenced but not included: Item 7 refers to an exhibit identifying the subsidiary that acquired the securities which is not present in the provided content

Insights

Securities Analyst

TL;DR: Mizuho discloses a material but passive 8.9% stake in Eureka Acquisition Corp; filing signals a non-control position.

Mizuho's reported 550,000-share position (8.9%) crosses the 5% disclosure threshold and is therefore material to holders. The Schedule 13G format and the certification that the stake is held in the ordinary course indicate a passive, non-control intent, which typically reduces immediate governance impact or hostile action risk. Disclosure of sole voting and dispositive power clarifies internal control of the position despite passive intent. Absence of transaction price and reliance on a referenced Exhibit A limit full transparency about acquisition mechanics and the specific subsidiary investor.

Corporate Governance Expert

TL;DR: Material ownership disclosed with parent-holding classification; passive status mitigates immediate governance concerns but warrants monitoring.

The filing identifies Mizuho as a parent holding company and notes potential indirect ownership through Mizuho Securities USA LLC and other affiliates, which is important for tracing control channels. The explicit certification that the shares "were not acquired for the purpose of changing or influencing control" supports treatment as a passive investor under Schedule 13G. Investors should note the procedural completeness: signature by a named managing director is included. However, the referenced Exhibit A is not provided here, leaving subsidiary identification incomplete in this document.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

Eureka Acquisition Corp

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G32168109

(CUSIP Number)

06/30/2025

(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. G32168109

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 550,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 550,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

550,000.00

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)

8.9 %

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: Eureka Acquisition Corp
(b)	Address of issuer's principal executive offices: 14 Prudential Tower Singapore, Republic of Singapore , 049712
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.: G32168109
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: 550,000
(b)	Percent of class: 8.9 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 550,000
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 550,000
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
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:	08/13/2025

FAQ

What stake does Mizuho Financial Group report in Eureka Acquisition Corp (EURKU)?

Mizuho reports beneficial ownership of 550,000 shares, representing 8.9% of Eureka Acquisition Corp common shares G32168109).

Does Mizuho have voting control over the EURKU shares it holds?

Yes. The filing states Mizuho has sole voting power and sole dispositive power over the 550,000 shares.

Is Mizuho holding the EURKU stake to influence control of the issuer?

No. In Item 10 the filer certifies the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control.

When was the Schedule 13G/A signed and filed?

The filing is signed by Takahiro Katsura as Managing Director on 08/13/2025.

Does the filing identify the specific subsidiary that acquired the securities?

The filing references an Exhibit A for subsidiary identification, but that exhibit is not included in the provided content.