Mizuho Financial Group takes 9% stake in Starry Sea (SSEA)

Rhea-AI Filing Summary

Mizuho Financial Group, Inc. filed a Schedule 13G reporting beneficial ownership of 685,965 common shares of Starry Sea Acquisition Corp, representing 9.0% of the class as of December 31, 2025. Mizuho reports sole voting and dispositive power over all these shares.

The filing describes Mizuho as a Japan-based parent holding company, with the securities directly held by wholly owned subsidiary Mizuho Securities USA LLC. Mizuho certifies the shares were acquired and are held in the ordinary course of business, not for changing or influencing control of Starry Sea.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Starry Sea Acquisition Corp

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G8559L112

(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. G8559L112

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 685,965.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 685,965.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

685,965.00

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)

9.0 %

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: Starry Sea Acquisition Corp
(b)	Address of issuer's principal executive offices: 418 Broadway #7531, Albany, NY 12207
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.: G8559L112
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: 685,965
(b)	Percent of class: 9.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 685,965
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 685,965
	(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 Starry Sea Acquisition Corp (SSEA)?

Mizuho Financial Group reports beneficial ownership of 685,965 common shares of Starry Sea Acquisition Corp, representing 9.0% of the class. Mizuho has sole voting and sole dispositive power over these shares, indicating a significant but minority, non-controlling position.

Is Mizuho Financial Group seeking control of Starry Sea Acquisition Corp (SSEA)?

Mizuho Financial Group states the shares were acquired and are held in the ordinary course of business, not to change or influence control of Starry Sea. The filing is made on Schedule 13G, typically used for passive ownership rather than activist or control-seeking positions.

How is Mizuho’s ownership in Starry Sea (SSEA) structured?

The filing explains that Mizuho Financial Group, Mizuho Bank and Mizuho Americas may be deemed indirect beneficial owners of shares directly held by Mizuho Securities USA LLC, their wholly owned subsidiary. Mizuho, as a parent holding company, reports sole voting and dispositive power over the position.

What is the date of Mizuho’s reported position in Starry Sea Acquisition Corp (SSEA)?

The Schedule 13G reports Mizuho’s 9.0% beneficial ownership as of December 31, 2025. This date reflects when the ownership level triggered the reporting requirement and provides a reference point for the disclosed share count and percentage of the outstanding class.

What type of security does Mizuho hold in Starry Sea Acquisition Corp (SSEA)?

Mizuho Financial Group’s position consists of common shares of Starry Sea Acquisition Corp, identified by CUSIP G8559L112. The filing specifies this single class of securities, with no reference to preferred stock, warrants, or other derivative instruments in the disclosed ownership.

What is Mizuho Financial Group’s regulatory status in this ownership filing?

Mizuho is identified as a parent holding company filing the Schedule 13G. It also certifies that the foreign regulatory scheme applicable to it is substantially comparable to that of a functionally equivalent U.S. institution, and undertakes to furnish additional information to Commission staff upon request.