# EDGAR Filing Document

**Accession Number:** 0001914823
**File Stem:** 0001929980-26-000291
**Filing Date:** 2026-6
**Character Count:** 6955
**Document Hash:** 98df20d4328b3c219535f7bc2cdddfc6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001929980-26-000291.hdr.sgml**: 20260617

**ACCESSION NUMBER**: 0001929980-26-000291

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260612

**FILED AS OF DATE**: 20260617

**DATE AS OF CHANGE**: 20260617

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Li Mingyu
- **CENTRAL INDEX KEY:** 0001914823

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42406
- **FILM NUMBER:** 261099694

**MAIL ADDRESS:**
- **STREET 1:** 555 SHIHUI ROAD, SONGJIANG DISTRICT
- **CITY:** SHANGHAI
- **STATE:** F4
- **ZIP:** 201100
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Horizon Space Acquisition II Corp.
- **CENTRAL INDEX KEY:** 0002032950
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANK CHECKS [6770]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 000000000
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 1412 BROADWAY
- **STREET 2:** 21ST FLOOR, SUITE 21V
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10018
- **BUSINESS PHONE:** (646)257-5537

**MAIL ADDRESS:**
- **STREET 1:** 1412 BROADWAY
- **STREET 2:** 21ST FLOOR, SUITE 21V
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10018

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[x] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Li Mingyu<br><sub>(Last) (First) (Middle)</sub><br>C/O HORIZON SPACE ACQUISITION II CORP.<br>1412 BROADWAY, 21ST FLOOR, SUITE 21V<br><sub>(Street)</sub><br>NEW YORK, NY 10018<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-06-12-05:00 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [X] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_Chief Executive Officer_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Horizon Space Acquisition II Corp. [ HSPT ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

**Remarks:**
Horizon Space Acquisition II Sponsor Corp. (the "Sponsor") was the record holder of certain securities of Horizon Space Acquisition II Corp. ("HSPT"). Mr. Mingyu Li beneficially owns 50% issued and outstanding shares of the Sponsor. In accordance with the governing documents of the Sponsor, Mr. Mingyu Li is the sole director of the Sponsor and deemed to have the voting and dispositive rights over the securities of HSPT held by the Sponsor.

This "Exit" Form 4 is voluntarily filed to report that, in connection with the consummation of the initial business combination of HSPT on June 12, 2026 pursuant to the Business Combination Agreement dated May 9, 2025 by and among HSPT, SL Science Holding Limited, a Cayman Islands exempted company limited by shares, SL BIO Ltd., a Cayman Islands exempted company limited by shares, CW Mega Limited, a Cayman Islands exempted company limited by shares, and WW Century Limited, a Cayman Islands exempted company limited by shares, (i) the Reporting Person no longer served as a director or officer of HSPT or held more than 10% of the issued and outstanding ordinary shares of HSPT after June 12, 2026, and therefore is no longer subject to Section 16 reporting, and (ii) the Sponsor no longer held more than 10% of the issued and outstanding ordinary shares of HSPT after June 12, 2026, and therefore is no longer subject to Section 16 reporting.

**Signature:** /s/ Mingyu Li  
**Date:** 2026-06-17

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**