-COMP ELECTRONICS (THAILAND) PUBLIC CO., LTD. CCP: CHONBURI CONCRETE PRODUCT PUBLIC COMPANY LIMITED CEN: CAPITAL ENGINEERING NETWORK PUBLIC COMPANY LIMITED CENTEL: CENTRAL PLAZA HOTEL PUBLIC COMPANY

names of recorded shareholders are entitled to the right to attend the Extraordinary General Meeting of Shareholders No. 1/2019 (Record Date) To: Director and Manager The Stock Exchange of Thailand

Company Limited - Translation - Ref: IR61/007 26 February 2018 Re: Management Discussion and Analysis for Yearly Ending 2016 To: President The Stock Exchange of Thailand Pursuant to Jaymart Public Company

November 13, 2017 The President & Director, The Stock Exchange of Thailand (SET) LETTER OF CLARIFICTION: CENTEL’s Q3/2017 & YTD 9 MONTHS /2017 OPERATING PERFORMANCE RESULTS This is to inform the SET

Limited. The Company has already registered the changes to the Department of Business Development, Ministry of Commerce on April 17, 2019. In this regard, the Company still uses the same stock symbol “RATCH

Analysis Q2/2020 IR63/013 13 August 2020 Subject Management Discussion and Analysis for the second quarter ended 30 June 2020 Attention President The Stock Exchange of Thailand According to the resolution of

-1- AIT (VP-SEC) 003E/2023 16 February 2023 Subject: Management's Discussion and Analysis of Operating Results for the year 2022 and Q4-2022 To: The President of the Stock Exchange of Thailand

and Exchange; “Stock Exchange” means the Stock Exchange of Thailand according to the Law on Securities and Exchange; “beneficial owner of derivatives traded by a client” means: (1) an owner or co-owner

Bond Dealer and Underwriter Others (Securities Business) Derivatives Agents Derivatives Dealer Stock Exchange/Futures Exchange TSFC/IDB Approval and Qualifications Approval and Standards Practice Code of

Pending Settlement, to be consistent with the Stock Exchange of Thailand’s operational guidelines, and international standards. Salient points include: 1. Non-resident (NR) who receives Thai Baht related to