Mizuho exits Horizon Space stake in 13G/A ownership filing (HSPO)

Rhea-AI Filing Summary

Mizuho Financial Group, Inc. filed an amended Schedule 13G stating it now beneficially owns 0 common shares of Horizon Space Acquisition I Corp., representing 0.0% of the class as of the event date. The filing confirms Mizuho has no sole or shared voting or dispositive power over any of the company’s common shares.

The firm is identified as a Japan-based parent holding company, and the amendment notes that its group holds ownership of 5 percent or less of this class of securities. The certification explains that any securities were held in the ordinary course of business and not to change or influence control of Horizon Space Acquisition I Corp.

Insights

Equity ownership analyst

Mizuho now reports a 0.0% beneficial stake in HSPO common shares.

The amended Schedule 13G shows Mizuho Financial Group, Inc. reporting beneficial ownership of 0.0%, or 0 common shares, of Horizon Space Acquisition I Corp. The event date is recorded as 12/31/2025, with no sole or shared voting or dispositive power remaining.

The filing characterizes Mizuho as a parent holding company and states the position was held in the ordinary course of business rather than to influence control. For investors, this signals that a previously reportable institutional holder no longer has a reportable economic or voting interest, and future ownership reports would need to reflect any new positions.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 4)

Horizon Space Acquisition I Corp.

(Name of Issuer)

Common Shares

(Title of Class of Securities)

G4619M109

(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. 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 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: 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: 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:	02/12/2026

FAQ

What does Mizuho’s amended Schedule 13G/A report for Horizon Space Acquisition I Corp. (HSPO)?

The amended Schedule 13G/A reports that Mizuho Financial Group, Inc. now beneficially owns 0 common shares of Horizon Space Acquisition I Corp., representing 0.0% of the outstanding class, indicating it no longer has a reportable ownership position under Schedule 13G rules.

What percentage of HSPO common shares does Mizuho Financial Group now own?

Mizuho Financial Group reports beneficial ownership of 0 common shares, equal to 0.0% of Horizon Space Acquisition I Corp.’s common share class. The filing also confirms no sole or shared voting or dispositive power remains over any HSPO common shares.

When was the ownership change in HSPO that triggered this Schedule 13G/A?

The Schedule 13G/A lists 12/31/2025 as the date of the event requiring the filing. That date marks when Mizuho Financial Group’s beneficial ownership in Horizon Space Acquisition I Corp. changed to 0 shares and 0.0% of the common share class.

How is Mizuho Financial Group classified in the HSPO Schedule 13G/A filing?

Mizuho Financial Group is classified as a parent holding company in the Schedule 13G/A. The filing notes it may be deemed an indirect beneficial owner of equity securities held by its wholly owned subsidiary, Mizuho Securities USA LLC, although its current beneficial ownership in HSPO is reported as zero.

Does Mizuho still have voting or dispositive power over HSPO shares?

No. The filing states Mizuho Financial Group has 0 shares with sole or shared voting power and 0 shares with sole or shared dispositive power. This confirms it no longer controls voting or sale decisions for any Horizon Space Acquisition I Corp. common shares.

What intent regarding control of HSPO does Mizuho certify in this Schedule 13G/A?

Mizuho certifies that any securities referenced were acquired and held in the ordinary course of business, not for changing or influencing control of Horizon Space Acquisition I Corp., and not in connection with any control-related transaction, aligning with typical passive institutional ownership disclosures.