CHIEF ACCOUNTANT In 2021, GC assigned Mrs. Sutha Suwanrath, Vice President – Financial Accounting 1 as of August 1, 2020, to oversee the Company’s accounting and ensure its compl iance with relevant standards, laws, and regulations. The qualifications of the Chief Accountants are disclosed in Attachment 1 “Details of Directors, Executives, Controllers, and company secretary”. HEAD OF INTERNAL AUDIT The Audit Committee meeting No. 8/2017 convened on September 18, 2017 resolved to approve the appointment of Mr. Amorn Putiphrawan as Senior Vice President, Internal Audit, responsible for evaluating and enhancing the internal control effectiveness, supervising the operations of the internal audit function to be in accordance with the objectives and the international standards, including objectivity and independent consulting on the company’s subsidiaries and report directly to the Audit Committee. The qualifications of the Head of Internal Audit are disclosed in Attachment 1 “Details of Directors, Executives, Controllers and Company Secretary”. HEAD OF CORPORATE COMPLIANCE Mrs. Rattana Nakasiri as Vice President, Corporate Governance, has been assigned as Head of Corporate Compliance on October 15, 2015. The responsibilities include overseeing corporate compliance, promoting corporate governance in business practices, and ensuring that the Executives and employees of GC Group comply with laws, rules, and regulations in countries where GC operates. The qualifications of the Head of Corporate Compliance are disclosed in Attachment 3 “Details of Heads of the Internal Audit and Compliance Units”. NAMES OF THE CORPORATE SECRETARY, CHIEF ACCOUNTANT, HEAD OF INTERNAL AUDIT AND HEAD OF CORPORATE COMPLIANCE COMPANY SECRETARY Under the Securities and Exchange Act (No. 4) B.E. 2551 (2008), Sections 89/15 and 89/16, the Board of Directors at Meeting No. 10/2562 held on August 19, 2019 appointed Mrs. Pilasphan Udomjarumanee, Senior Vice President, Corporate Secretary and Legal, as Company Secretary. By law, the responsibilities of Company Secretary include the preparation and safekeeping of important company documents, including the register of directors, meeting notices, Board and shareholders’ meeting minutes, 56-1 One Report and conflicts of interest form filled by Directors and Executives. The Company Secretary is in charge of organizing Board and shareholders’ meetings and submitting copies of reports on Directors and Executives interests to the Chairman of the Board of Directors and the Chairman of the Audit Committee. The Company Secretary also advises the Board and Executives on the rules and regulations they should be aware of, organizes training and orientation for current and new Directors, as well as providing them with information essential to their performance of duties as Directors. Moreover, the Company Secretary oversees compliance with laws, regulations and resolutions passed in Board and shareholders’ meetings, as well as collaborates with relevant agencies on compliance. The Company Secretary has undergone training courses necessary for her to duly perform her roles. The qualifications of the Company Secretary are disclosed in Attachment 1 “Details of Directors, Executives, Controllers and Company Secretary”. OTHER IMPORTANT INFORMATION 152 PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED Form 56-1 One Report 2021