YONG THAI PUBLIC COMPANY LIMITED 633/14 Sathupradit Road, Yannawa, Bangkok 10120 Thailand Tel. (662) 2943364-8, Fax : (662) 2943373 YTC 17/2019 August 14, 2019 To : The President The Stock Exchange

(Translation) (Translation) IR 015/18 August 9, 2018 President and Director The Stock Exchange of Thailand Subject : To explain the reasons on the company’s net profit (net loss) more than 20% from

(Translation) (Translation) IR 024/18 November 14, 2018 President and Director The Stock Exchange of Thailand Subject : To explain the reasons on the company’s net profit (net loss) more than 20

I - Translation - Ref : LPH/SET 2019/012 November 13, 2019 Subject : Clarification on the Operating Results for the three-month period ended September 30, 2019 (Q3/2019) To : President The Stock

Microsoft Word - 015 ชี้แจงกำไรE (Translation) IR 015/20 May 14, 2020 Re : To explain the reasons on the company’s net profit (net loss) more than 20% from last year. To : The President The Stock

MATI 07/2563 May 14, 2020 Subject Reporting First Quarter Consolidated Financial Statement which ended at March 31, 2020 To Director and Manager The Stock Exchange of Thailand For three-month period

(Translation) (Translation) IR 014/19 November 12, 2019 President and Director The Stock Exchange of Thailand Subject : To explain the reasons on the company’s net profit (net loss) more than 20

1 --Translation-- Sor Gor 7/2018 January 19, 2018 Subject: Management Discussion and Analysis for the year ended December 31, 2017 (Unaudited) To: The President The Stock Exchange of Thailand

1 --Translation-- Sor Gor 11/2018 February 22, 2018 Subject: Management Discussion and Analysis for the year ended December 31, 2017 (Audited) To: The President The Stock Exchange of Thailand

(Translation) No. MD119/2560 August 29, 2017 Re: Clarification on the Financial Performance of the Company and its subsidiaries as of Year 2015 (Amendment) Attn: President The Stock Exchange of