X0202 SCHEDULE 13G 0001293451 XXXXXXXX LIVE Class A Ordinary Shares 03/19/2026 0002088256 Horizon Quantum Holdings Ltd. Y4000A102 29 MEDIA CIRCLE #05-22 SINGAPORE U0 138565 Rule 13d-1(c) Tencent Holdings Ltd E9 4175570.00 0.00 4175570.00 0.00 4175570.00 N 13.1 CO THL A12 Limited D8 4175570.00 0.00 4175570.00 0.00 4175570.00 N 13.1 CO Horizon Quantum Holdings Ltd. 29 Media Cir. #05-22, Singapore, 138565 Tencent Holdings Limited THL A12 Limited For both Tencent Holdings Limited and THL A12 Limited: 29/F, Three Pacific Place No. 1 Queen's Road East Wanchai, Hong Kong Tencent Holdings Limited - Cayman Islands THL A12 Limited - British Virgin Islands Y 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. 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. See row 5 of the cover page of each reporting person. See row 6 of the cover page of each reporting person. See row 7 of the cover page of each reporting person. See row 8 of the cover page of each reporting person. Y Y N See item 4. Y Y N 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. 99.1 Joint Filing Agreement, dated March 25, 2026, by and between Tencent Holdings Limited and THL A12 Limited. Tencent Holdings Ltd /s/ Ma Huateng 03/25/2026 THL A12 Limited /s/ Gu Tingting Jackie 03/25/2026