GC One Report 2023 [EN]

Whistleblower and Witness Protection Whistleblowers or witnesses who collaborate in the investigation will be provided with the following protection under the Whistleblower Policy: (1) Whistleblowers or informants may choose to file a complaint anonymously of their own volition as a whistleblower protection measure. (2) A whistleblower, a stakeholder, or any person who cooperates in good faith in the investigation will be protected from retaliation (non-retaliation). (3) Information of the whistleblower or of any persons involved will be kept strictly confidential according to GC’s regulations on information classification and security of confidential documents. (4) The Company will formulate suitable mitigation measures for the whistleblower or the affected party. Complaint Statistics In 2023, the Company received a total of 32 complaints*, divided into seven categories as follows: Category Number of complaints on Corrective Action Business Code of Conduct 1 1 case of no violation Non-compliance 3 2 cases of no violation Verbal warning for 1 case Fraud or Corruption 3 1 case of no violation 1 case of disciplinary action Disciplinary committee appointed for 1 case Use of Insider Information None Conflicts of Interest None Voice of Customer 22 16 cases resolved Voice from Community 1 1 case resolved Employee 2 1 case of disciplinary action Disciplinary committee appointed for 1 case Safety, Occupational Health, and Environment None Remark: * Data as of December 31, 2023 Audit Committee Report The Audit Committee has held the meetings, the details of which are as set out in “Meeting Attendance and Remuneration of Individual Directors.” In this regard, details of the performance of the Audit Committee in 2023 are as set out in “Audit Committee Report.” Summary of Other Sub-committees’ Performance The other Sub-committees of the Company consist of the Corporate Governance and Sustainability Committee, the Nomination and Remuneration Committee, and the Risk Management Committee. Details on the number of meetings of these Sub-committees and the meeting attendance of each individual member appear under “Meeting Attendance and Remuneration of Individual Directors.” Detai ls on the performance of dut ies of these Subcommittees for the year 2023 appear under “Report of the Corporate Governance and Sustainability Commi t tee” , “Repor t of the Nominat ion and Remuneration Committee” and “Report of the Risk Management Committee.” 207 PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED Form 56-1 One Report 2023

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