Institutional holders of Horizon Space (HSPO) now report 0% ownership

Rhea-AI Filing Summary

Horizon Space Acquisition I Corp. received an amended ownership report showing that three institutional investors now report no beneficial stake in its ordinary shares. Westchester Capital Management, Virtus Investment Advisers, and The Merger Fund each disclose beneficial ownership of 0 shares, representing 0.0% of the class.

The filing notes this percentage is based on 2,404,234 ordinary shares outstanding as of November 20, 2025, as reported in the company’s Form 10-Q. The firms certify that any securities were held in the ordinary course of business and not to change or influence control of Horizon Space.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Horizon Space Acquisition I Corp.

(Name of Issuer)

Ordinary Shares, $0.0001 par value per share

(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

Westchester Capital Management, LLC

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

DELAWARE

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)

0.00 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: * Based on 2,404,234 Shares outstanding as of November 20, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 26, 2025.

SCHEDULE 13G

CUSIP No. G4619M109

1

Names of Reporting Persons

Virtus Investment Advisers, LLC

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

DELAWARE

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)

IA

Comment for Type of Reporting Person: * Based on 2,404,234 Shares outstanding as of November 20, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 26, 2025. The amounts reported on this page are also included in the amounts reported by Westchester Capital Management, LLC on this Schedule 13G.

SCHEDULE 13G

CUSIP No. G4619M109

1

Names of Reporting Persons

The Merger Fund

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

MASSACHUSETTS

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)

IV

Comment for Type of Reporting Person: * Based on 2,404,234 Shares outstanding as of November 20, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 26, 2025. The amounts reported on this page are also included in the amounts reported by Virtus Investment Advisers, LLC on this Schedule 13G.

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: This statement is being filed jointly by the following (each, a "Reporting Person," and collectively, the "Reporting Persons"): Westchester Capital Management, LLC ("Westchester"), a Delaware limited liability company, Virtus Investment Advisers, LLC ("Virtus"), a Delaware limited liability company, and The Merger Fund ("MF"), a Massachusetts business trust. Virtus, a registered investment adviser, serves as the investment adviser to each of MF and The Merger Fund VL ("MF VL"). Westchester, a registered investment adviser, serves as sub-advisor to each of MF, MF VL, and JNL Multi-Manager Alternative Fund ("JARB" together with MF and MF VL, the "Funds"). The Funds directly hold Ordinary Shares of the Company for the benefit of the investors in those Funds. Mr. Roy Behren and Mr. Michael T. Shannon each serve as Co-Presidents of Westchester.
(b)	Address or principal business office or, if none, residence: Westchester Capital Management, LLC 100 Summit Drive, Valhalla, NY 10595 Virtus Investment Advisers, LLC One Financial Plaza, Hartford, CT 06103 The Merger Fund 101 Munson Street, Greenfield, MA 01301-9683
(c)	Citizenship: Each of Westchester and Virtus are organized under the laws of the State of Delaware. MF is organized under the laws of the State of Massachusetts.
(d)	Title of class of securities: Ordinary Shares, $0.0001 par value per share
(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).
Item 4.	Ownership
(a)	Amount beneficially owned: Westchester Capital Management, LLC: 0 Virtus Investment Advisers, LLC: 0 The Merger Fund: 0
(b)	Percent of class: Westchester Capital Management, LLC: 0.0% Virtus Investment Advisers, LLC: 0.0% The Merger Fund: 0.0%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Westchester Capital Management, LLC: 0 Virtus Investment Advisers, LLC: 0 The Merger Fund: 0
	(ii) Shared power to vote or to direct the vote: Westchester Capital Management, LLC: 0 Virtus Investment Advisers, LLC: 0 The Merger Fund: 0
	(iii) Sole power to dispose or to direct the disposition of: Westchester Capital Management, LLC: 0 Virtus Investment Advisers, LLC: 0 The Merger Fund: 0
	(iv) Shared power to dispose or to direct the disposition of: Westchester Capital Management, LLC: 0 Virtus Investment Advisers, LLC: 0 The Merger Fund: 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.
	Not Applicable
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.

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.

Westchester Capital Management, LLC

Signature:	/s/ CaSaundra Wu
Name/Title:	CaSaundra Wu Chief Compliance Officer
Date:	02/13/2026

Virtus Investment Advisers, LLC

Signature:	/s/ Chetram Persaud
Name/Title:	Chetram Persaud Chief Compliance Officer
Date:	02/13/2026

The Merger Fund

Signature:	/s/ Daphne Chisolm
Name/Title:	Daphne Chisolm Vice President, Counsel and Assistant Secretary
Date:	02/13/2026

FAQ

What does the latest Schedule 13G/A reveal about HSPO ownership?

The filing shows key institutional holders now report 0% ownership in HSPO. Westchester Capital Management, Virtus Investment Advisers, and The Merger Fund each list beneficial ownership of 0 ordinary shares, indicating no reportable stake under SEC rules as of the event date.

Which investors are reporting on Horizon Space Acquisition I Corp. (HSPO)?

Three related institutional investors report on HSPO in this filing. Westchester Capital Management, Virtus Investment Advisers, and The Merger Fund jointly file, describing their advisory and sub-advisory roles for certain funds that previously held Horizon Space ordinary shares for fund investors.

What percentage of HSPO does each reporting person currently hold?

Each reporting person discloses beneficial ownership of 0.0% of HSPO. Westchester Capital Management, Virtus Investment Advisers, and The Merger Fund all report 0 shares, corresponding to 0.0% of Horizon Space’s ordinary shares based on the outstanding share count referenced in the document.

How many Horizon Space (HSPO) shares were outstanding in the 13G/A reference?

The filing relies on 2,404,234 HSPO ordinary shares outstanding. This figure comes from Horizon Space’s Form 10-Q, which reported 2,404,234 shares outstanding as of November 20, 2025, and is used to calculate ownership percentages in the schedule.

What is the event date triggering this HSPO Schedule 13G/A filing?

The event date for this Schedule 13G/A is December 31, 2025. That date marks when the ownership status requiring an amended beneficial ownership report occurred, prompting the institutional investors to update their disclosed positions in Horizon Space ordinary shares.

Do the HSPO reporting investors seek to influence control of the company?

The investors state they are not seeking to influence control of HSPO. They certify that any securities were acquired and held in the ordinary course of business and not for the purpose or effect of changing or influencing control of Horizon Space Acquisition I Corp.