[SCHEDULE 13G/A] Horizon Space Acquisition I Corp. Unit SEC Filing

Rhea-AI Filing Summary

Mizuho Financial Group, Inc. reports beneficial ownership of 375,209 common shares of Horizon Space Acquisition I Corp., representing 9.0% of the class. The filing states Mizuho has sole voting and sole dispositive power over these shares and that the position is held in the ordinary course of business, not for the purpose of changing or influencing control of the issuer. The filing also notes that Mizuho Securities USA LLC directly holds the equity securities and that Mizuho Bank, Ltd. and Mizuho Americas LLC may be deemed indirect beneficial owners through the parent holding company structure.

Positive

• 9.0% ownership disclosed equal to 375,209 shares of Horizon Space Acquisition I Corp.
• Sole voting and sole dispositive power reported for the disclosed shares, clarifying authority over the position.
• Filed as Schedule 13G, indicating the position is held in the ordinary course of business and asserted not to be for influencing control.

Negative

• None.

Insights

Financial Analyst

TL;DR: Mizuho discloses a material, passive 9.0% stake (375,209 shares); the filing signals transparency but not an active control intent.

The Schedule 13G shows a meaningful >5% position that must be disclosed to markets; however, the filer asserts the shares were acquired and are held in the ordinary course of business and not to influence control. For investors and analysts, this is a material ownership disclosure because it quantifies a sizeable passive stake and clarifies voting/dispositive authority. There is no indication of activism, acquisition financing, or plans to change governance based on this document alone.

Corporate Governance Expert

TL;DR: The filing documents passive ownership with sole voting rights but explicitly denies intent to influence control, so governance impact appears limited.

This Schedule 13G filing, including the parent/subsidiary identification, clarifies ownership lines and control rights: Mizuho reports sole voting and dispositive power yet certifies a passive posture. That combination is important for transparency; it notifies the company and market regulators of a significant shareholder while asserting non-intervention. From a governance perspective, the filing imposes disclosure obligations but does not itself signal imminent board or strategy changes.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

Horizon Space Acquisition I Corp.

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G4619M109

(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. G4619M109

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 375,209.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 375,209.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

375,209.00

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: Horizon Space Acquisition I Corp.
(b)	Address of issuer's principal executive offices: 1412 BROADWAY 21ST FLOOR, Suite 21V NEW YORK, NY, 10018
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.: G4619M109
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: 375,209
(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: 375,209
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 375,209
	(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

How many Horizon Space (HSPOU) shares does Mizuho own?

Mizuho reports beneficial ownership of 375,209 shares of Horizon Space Acquisition I Corp.

What percentage of HSPOU does Mizuho's holding represent?

The filing states the holding represents 9.0% of the class of common shares.

Does Mizuho claim voting or dispositive power over the shares?

Yes. The filing reports sole voting power and sole dispositive power for the 375,209 shares.

Is Mizuho seeking to influence control of Horizon Space according to the filing?

No. The certification states the securities were acquired and are held in the ordinary course of business and were not acquired to change or influence control.

Who directly holds the equity securities according to the filing?

The filing indicates the securities are directly held by Mizuho Securities USA LLC, with Mizuho Bank, Ltd. and Mizuho Americas LLC potentially deemed indirect beneficial owners through the parent holding company structure.