# EDGAR Filing Document

**Accession Number:** 0001293451
**File Stem:** 0000950103-26-004607
**Filing Date:** 2026-3
**Character Count:** 11214
**Document Hash:** 94d9f67b5c075cc3a07fd648b43ca33f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000950103-26-004607.hdr.sgml**: 20260325

**ACCESSION NUMBER**: 0000950103-26-004607

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13G

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260325

**DATE AS OF CHANGE**: 20260325

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Horizon Quantum Holdings Ltd.
- **CENTRAL INDEX KEY:** 0002088256
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-COMPUTER PROGRAMMING SERVICES [7371]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 000000000
- **STATE OF INCORPORATION:** U0
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-95574
- **FILM NUMBER:** 26788274

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** ALICE@MEDIAOPOLIS
- **STREET 2:** 29 MEDIA CIRCLE #05-22
- **CITY:** SINGAPORE
- **PROVINCE COUNTRY:** U0
- **ZIP:** 138565
- **BUSINESS PHONE:** 6581015024

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** ALICE@MEDIAOPOLIS
- **STREET 2:** 29 MEDIA CIRCLE #05-22
- **CITY:** SINGAPORE
- **PROVINCE COUNTRY:** U0
- **ZIP:** 138565

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Horizon Quantum Holdings Pte. Ltd.
- **DATE OF NAME CHANGE:** 20251230

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Rose Holdco Pte. Ltd.
- **DATE OF NAME CHANGE:** 20250924
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Tencent Holdings Ltd
- **CENTRAL INDEX KEY:** 0001293451
- **ORGANIZATION NAME:** International Corp Fin
- **EIN:** 000000000
- **STATE OF INCORPORATION:** E9

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G

**BUSINESS ADDRESS:**
- **STREET 1:** ROOM 3506, 35TH FLOOR
- **STREET 2:** TOWER 2, LIPPO CENTRE
- **CITY:** ADMIRALTY
- **STATE:** K3
- **ZIP:** 00000
- **BUSINESS PHONE:** 86-755-86013388

**MAIL ADDRESS:**
- **STREET 1:** ROOM 3506, 35TH FLOOR
- **STREET 2:** TOWER 2, LIPPO CENTRE
- **CITY:** ADMIRALTY
- **STATE:** K3
- **ZIP:** 00000

## Exhibit 99.1

**Exhibit 99.1**

**JOINT FILING AGREEMENT**

The undersigned hereby agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, and that all subsequent amendments to this statement on Schedule 13G may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements.

Date: March 25, 2026

---

| | |
|:---|:---|
| **TENCENT HOLDINGS LIMITED** | **TENCENT HOLDINGS LIMITED** |
| By: | /s/ Ma Huateng |
|  | Name: Ma Huateng |
|  | Title: Director |

---

---

| | |
|:---|:---|
| **THL A12 LIMITED** | **THL A12 LIMITED** |
| By: | /s/ Gu Tingting Jackie |
|  | Name: Gu Tingting Jackie |
|  | Title: Director |

---

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

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**Issuer:** Horizon Quantum Holdings Ltd.

**Title of Class of Securities:** Class A Ordinary Shares

**CUSIP Number:** —

**Date of Event Which Requires Filing of this Statement:** 03/19/2026

**Check the appropriate box to designate the rule pursuant to which this Schedule is filed:**

- [ ] Rule 13d-1(b)

- [x] Rule 13d-1(c)

- [ ] Rule 13d-1(d)

---

| 1. | Names of Reporting Persons<br>Tencent Holdings Ltd | Names of Reporting Persons<br>Tencent Holdings Ltd |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>E9 | Citizenship or Place of Organization<br>E9 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>4175570.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>4175570.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>4175570.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>4175570.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>13.1% | Percent of Class Represented by Amount in Row (9)<br>13.1% |
| 12. | Type of Reporting Person (See Instructions)<br>CO | Type of Reporting Person (See Instructions)<br>CO |

---

| 1. | Names of Reporting Persons<br>THL A12 Limited | Names of Reporting Persons<br>THL A12 Limited |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>D8 | Citizenship or Place of Organization<br>D8 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>4175570.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>4175570.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>4175570.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>4175570.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>13.1% | Percent of Class Represented by Amount in Row (9)<br>13.1% |
| 12. | Type of Reporting Person (See Instructions)<br>CO | Type of Reporting Person (See Instructions)<br>CO |

---

**Item 1(a). Name of Issuer:**
Horizon Quantum Holdings Ltd.

**Item 1(b). Address of Issuer's Principal Executive Offices:**
29 Media Cir. #05-22, Singapore, 138565

**Item 2(a). Name of Person Filing:**
Tencent Holdings Limited

THL A12 Limited

**Item 2(b). Address of Principal Business Office:**
For both Tencent Holdings Limited and THL A12 Limited:

29/F, Three Pacific Place
No. 1 Queen's Road East
Wanchai, Hong Kong

**Item 2(c). Citizenship:**
Tencent Holdings Limited - Cayman Islands

THL A12 Limited - British Virgin Islands

**Item 2(d). Title of Class of Securities:**
Class A Ordinary Shares

**Item 2(e). CUSIP Number:**
—

**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:**

THL A12 Limited beneficially owns 4,175,570 Class A Ordinary Shares.
Tencent Holdings Limited may be deemed to have beneficial ownership of 4,175,570 Class A Ordinary Shares beneficially owned by THL A12 Limited, which is a direct wholly-owned subsidiary of Tencent Holdings Limited.

**(b) Percent of class:**

The 4,175,570 Class A Ordinary Shares that are beneficially owned by THL A12 Limited and Tencent Holdings Limited represent approximately 13.1% of the total outstanding Class A Ordinary Shares of the Company.   The foregoing calculation is based on an aggregate of 31,833,549 Class A Ordinary Shares outstanding as of March 19, 2026 according to records of the Issuer.

**(c) Number of shares as to which the person has:**

**(i) Sole power to vote or to direct the vote:**

See row 5 of the cover page of each reporting person.

**(ii) Shared power to vote or to direct the vote:**

See row 6 of the cover page of each reporting person.

**(iii) Sole power to dispose or to direct the disposition of:**

See row 7 of the cover page of each reporting person.

**(iv) Shared power to dispose or to direct the disposition of:**

See row 8 of the cover page of each reporting person.

**Item 5. Ownership of Five Percent or Less of a Class.**

[x] If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following.

**Item 6. Ownership of More than 5 Percent on Behalf of Another Person.**

Not Applicable

**Item 7. Identification and Classification of the Subsidiary**

See item 4.

**Item 8. Identification and Classification of Members of the Group**

Not Applicable

**Item 9. Notice of Dissolution of Group**

Not Applicable

**Item 10. Certification:**

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above 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.

**Tencent Holdings Ltd**

**Date:** 03/25/2026

**By:** /s/ Ma Huateng

**Name & Title:** Ma Huateng/Director

**THL A12 Limited**

**Date:** 03/25/2026

**By:** /s/ Gu Tingting Jackie

**Name & Title:** Gu Tingting Jackie/Director