Mizuho discloses 0.2% stake in Spark I Acquisition

Mizuho Financial Group, Inc., a Japan-based parent holding company, filed an amended Schedule 13G reporting its beneficial ownership in Spark I Acquisition Corporation common shares.

Rhea-AI Filing Summary

Mizuho Financial Group, Inc., a Japan-based parent holding company, filed an amended Schedule 13G reporting its beneficial ownership in Spark I Acquisition Corporation common shares. Mizuho reports beneficial ownership of 10,287 common shares, representing 0.2% of the class. It has sole voting power and sole dispositive power over all 10,287 shares, with no shared voting or dispositive power. The shares are directly held by Mizuho Securities USA LLC, and Mizuho Financial Group, Inc., Mizuho Bank, Ltd., and Mizuho Americas LLC may be deemed indirect beneficial owners through this wholly owned subsidiary. The filing confirms ownership of 5% or less of the class.

Key Figures

Beneficially owned shares: 10,287 shares Ownership percentage: 0.2% Sole voting power: 10,287 shares +1 more

4 metrics

Beneficially owned shares 10,287 shares Common shares of Spark I Acquisition Corporation reported by Mizuho Financial Group, Inc.

Ownership percentage 0.2% Percent of Spark I Acquisition Corporation common share class owned by Mizuho Financial Group, Inc.

Sole voting power 10,287 shares Shares over which Mizuho has sole power to vote or direct the vote

Sole dispositive power 10,287 shares Shares over which Mizuho has sole power to dispose or direct disposition

Key Terms

beneficial ownership, sole voting power, dispositive power, Parent Holding Company, +1 more

5 terms

beneficial ownership financial

"Amount beneficially owned: 10,287 (b) | Percent of class: 0.2 %"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

sole voting power financial

"Sole Voting Power 10,287.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power financial

"Sole Dispositive Power 10,287.00 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.

Parent Holding Company financial

"CUSIP No.: G8316B100 | Parent Holding Company Item 4."

indirect beneficial owners financial

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

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake in SPKL does Mizuho Financial Group report in this Schedule 13G/A?

Mizuho Financial Group reports beneficial ownership of 10,287 common shares of Spark I Acquisition Corporation (SPKL), representing 0.2% of the outstanding class. This ownership is categorized as 5% or less of the class.

Who is the reporting person in this SPKL Schedule 13G/A amendment?

The reporting person is Mizuho Financial Group, Inc., a Japan-based parent holding company. The filing also notes Mizuho Bank, Ltd. and Mizuho Americas LLC as entities that may be deemed indirect beneficial owners through Mizuho Securities USA LLC.

How much voting power does Mizuho have over SPKL shares?

Mizuho reports sole voting power over 10,287 shares of Spark I Acquisition Corporation and no shared voting power. It likewise has sole dispositive power over the same number of shares, with no shared dispositive authority.

Through which subsidiary are SPKL shares held for Mizuho Financial Group?

The equity securities are directly held by Mizuho Securities USA LLC, a wholly owned subsidiary. Mizuho Financial Group, Inc., Mizuho Bank, Ltd., and Mizuho Americas LLC may be deemed indirect beneficial owners of these SPKL shares through that subsidiary.

Does Mizuho Financial Group own more than 5% of SPKL’s common shares?

No. Mizuho Financial Group reports ownership of 0.2% of the class, or 10,287 shares, of Spark I Acquisition Corporation common stock. The filing explicitly classifies this as ownership of 5 percent or less of the class.

What is Mizuho Financial Group’s classification in the SPKL Schedule 13G/A?

Mizuho Financial Group is identified as a Parent Holding Company. The report references an exhibit (Exhibit A) for identification and classification of the relevant subsidiary that acquired the Spark I Acquisition Corporation securities.

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

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Available on EDGAR 08/13/2026 - 06:24 AM Accepted by SEC EDGAR 08/13/2026 - 06:23 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. 1)

Spark I Acquisition Corporation

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G8316B100

(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): G8316B100

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 10,287.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 10,287.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

10,287.00

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)

0.2 %

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: Spark I Acquisition Corporation
(b)	Address of issuer's principal executive offices: 3790 El Camino Real, Unit #570, Palo Alto, CA 94306
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.: G8316B100
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: 10,287
(b)	Percent of class: 0.2 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 10,287
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 10,287
	(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