The We refer to the: (i) Article 10 Financial Services Authority Regulation No. 35/POJK.04/2014 dated 8 December 2014, concerning Corporate Secretary of Issuers or Public Companies; (ii) Chapter III.2.5 Appendix to the Resolutions of the Board of Directors of Indonesia Stock Exchange No. Kep-0087/BEI/12-2025 dated 12 December 2025, regarding Regulation Number I-E concerning Obligation of Information Submission; and (iii) The Board of Directors’ Resolution of the Company dated 8 January 2026, we hereby convey that the Company has received the resignation of Mr. Hartono Tanuwidjaja as the Corporate Secretary of the Company and appoint Mr. Ardan Rasyid Wiradhatama as the new Corporate Secretary of the Company effective from 8 January 2026. In connection with this, any form of correspondence addressed to the Corporate Secretary of the Company, please be addressed to: Corporate Secretary PT Solusi Tunas Pratama Tbk Menara BCA, Lantai 49 Jl. M.H. Thamrin No. 1, Jakarta 10310 Tel: +6221-23585555 Surel: corporate.secretary@stptower.com