SEC Filing - Horizon Quantum Holdings Ltd.

SCHEDULE 13G

CUSIP No.

Names of Reporting Persons

Tencent Holdings Ltd

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 3,800,438.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,800,438.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

3,800,438.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

11.1 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

Names of Reporting Persons

THL A12 Limited

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

VIRGIN ISLANDS, BRITISH

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 3,800,438.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,800,438.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

3,800,438.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

11.1 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

Item 1.

(a)

Name of issuer:

Horizon Quantum Holdings Ltd.

(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

(b)

Address or principal business office or, if none, residence:

For both Tencent Holdings Limited and THL A12 Limited: 29/F, Three Pacific Place No. 1 Queen's Road East Wanchai, Hong Kong

(c)

Citizenship:

Tencent Holdings Limited - Cayman Islands THL A12 Limited - British Virgin Islands

(d)

Title of class of securities:

Class A Ordinary Shares

(e)

CUSIP No.:

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 3,800,438 Class A Ordinary Shares. Tencent Holdings Limited may be deemed to have beneficial ownership of 3,800,438 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:

See row 11 of the cover page of each reporting person. The foregoing calculation is based on an aggregate of 34,227,495 Class A Ordinary Shares outstanding as of June 30, 2026, as reported in the unaudited condensed consolidated interim financial statements of the Issuer filed as Exhibit 99.1 to the Issuer's current report on Form 6-K furnished to the U.S. Securities and Exchange Commission on August 4, 2026. %

(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 for 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 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 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

Signature:	/s/ Ma Huateng
Name/Title:	Ma Huateng, Director
Date:	08/14/2026

THL A12 Limited

Signature:	/s/ Li Qingjie
Name/Title:	Li Qingjie, Director
Date:	08/14/2026

Exhibit Information

99.1 Joint Filing Agreement (previously filed as Exhibit 99.1 to Schedule 13G filed by the reporting persons with the Securities and Exchange Commission on March 25, 2026).