Ref: SP 2020/008 Date : May 14, 2020 Subject : The Explanation to SET concerning the operating result for Q1/2020 more than 20% Attention : The Director and Manager of the Stock Exchange of Thailand

ชี้แจงผลการดำเนินงานของบริษัทและบริษัทย่อยประจำปี 2549 UKEM012/2020 May 15, 2020 Subject : Management Discussion and Analysis of Business Operation results for Quarter 1/2020 To : Director and

19 September 2005 - Translate – Ref. HF 0051/2020 May 18th, 2020. Subject : Disclosure of Connected Transaction (Reviewed 2) Attn : Managing Director of the Stock Exchange of Thailand. According to

resolution of The Board of Director No. 1/2020 dated on February 12, 2020 The Board of Director passed the resolution to provide financial assistance to APCON, the associated company which the company holds

. Nipon Leelasithorn ) Chairman of the Executive Director, and Managing Director

Party Transaction 12/05/2022 18:01 Report of the Resolutions of Board of Directors' Meeting No.3/2022 and the connected transaction 02/03/2022 17:00 Dividend payment, Changing of Director, 2022 AGM date

Notification on resignation of director, appointment of director, change of authorized directors and the connected transaction 15/03/2021 07:08 Notice of the acquisition of assets from the purchase of the newly

resignation of director, appointment of director, change of authorized directors and the connected transaction 15/03/2021 07:08 Notice of the acquisition of assets from the purchase of the newly issued ordinary

:16 Notice of Notification of the Resolutions of the Board of Directors' Meeting No.2 /2022 regarding the appointment of director in replacement of director who resigned and to enter Connected

Our Ref: APURE 017/2021 14 May 2021 Subject Clarification on First Quarter’s Operating Performance (1/2021) Attn. To The Director and President of the Stock Exchange of Thailand The company clarifies