Mizuho Financial Group (EURK) reports 0% ownership in Eureka Acquisition Corp

Rhea-AI Filing Summary

Mizuho Financial Group, Inc., as a parent holding company, reports that it no longer holds a beneficial ownership position in the common shares of Eureka Acquisition Corp. The filing states that Mizuho has 0 shares beneficially owned, representing 0.0% of the class, with no sole or shared voting or dispositive power over any shares.

The disclosure notes that Mizuho Financial Group, Inc., Mizuho Bank, Ltd. and Mizuho Americas LLC may be deemed indirect beneficial owners of equity securities directly held by their wholly owned subsidiary, Mizuho Securities USA LLC, but for this issuer the reported beneficial ownership is zero. The report is signed by Managing Director Takahiro Katsura on behalf of Mizuho Financial Group, Inc.

Key Figures

Beneficially owned shares: 0 Percent of class owned: 0.0% Sole voting power: 0 +3 more

6 metrics

Beneficially owned shares 0 Amount beneficially owned in Eureka Acquisition Corp common shares

Percent of class owned 0.0% Reported ownership percentage of Eureka Acquisition Corp common shares

Sole voting power 0 Number of shares over which Mizuho has sole power to vote

Shared voting power 0 Number of shares over which Mizuho has shared power to vote

Sole dispositive power 0 Number of shares over which Mizuho has sole power to dispose

Shared dispositive power 0 Number of shares over which Mizuho has shared power to dispose

Key Terms

beneficial owner, dispositive power, Schedule 13D, Parent Holding Company

4 terms

beneficial owner financial

"may be deemed to be indirect beneficial owners of said equity securities"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

dispositive power financial

"Sole Dispositive Power 0.00 8 | Shared Dispositive Power 0.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Schedule 13D regulatory

"information that would otherwise be disclosed in a Schedule 13D"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

Parent Holding Company financial

"CUSIP No.: G32168109 | Parent Holding Company"

FAQ

What does Mizuho Financial Group report in this Schedule 13G/A for EURK?

Mizuho Financial Group reports 0 common shares of Eureka Acquisition Corp beneficially owned, representing 0.0% of the class, with no sole or shared voting or dispositive power over any shares.

Does Mizuho Financial Group still own at least 5% of Eureka Acquisition Corp (EURK)?

No. The Schedule 13G/A states that Mizuho Financial Group’s beneficial ownership is 0 shares, which is 0.0% of the class, and the filing is marked as ownership of 5 percent or less of the class.

Who is the reporting person in this Schedule 13G/A related to EURK?

The reporting person is Mizuho Financial Group, Inc., a parent holding company organized in Japan, with its principal office at 1-5-5, Otemachi, Chiyoda-ku, Tokyo, 100-8176, Japan.

What powers over EURK shares does Mizuho Financial Group report?

Mizuho Financial Group reports no sole or shared voting power and no sole or shared dispositive power over Eureka Acquisition Corp common shares, consistent with a beneficial ownership of zero shares.

How are Mizuho’s subsidiaries referenced in relation to EURK in this filing?

The filing notes that Mizuho Financial Group, Mizuho Bank, Ltd. and Mizuho Americas LLC may be deemed indirect beneficial owners of equity securities directly held by Mizuho Securities USA LLC, their wholly owned subsidiary, while reporting zero beneficial ownership in this issuer.

Who signed the Schedule 13G/A for Mizuho concerning EURK and when?

The report was signed by Takahiro Katsura, Managing Director, Global Corporate Function Coordination Department, on 08/13/2026, certifying the accuracy of the information and the comparability of the foreign regulatory scheme.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/13/2026 - 06:07 AM Accepted by SEC EDGAR 08/13/2026 - 06:06 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

Eureka Acquisition Corp

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G32168109

(CUSIP Number)

06/30/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 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 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0.0 %

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: 0
(b)	Percent of class: 0.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	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:	08/13/2026