No No. CC20190204ELE February 27, 2019 Re: Clarification of the changes in operation performance for the year ended 31 December 2018 Attn: The President The Stock Exchange of Thailand Cal-Comp

YONG THAI PUBLIC COMPANY LIMITED 633/14 Sathupradit Road, Yannawa, Bangkok 10120 Thailand Tel. (662) 2943364-8, Fax : (662) 2943373 YTC 1/2019 February 28, 2019 To : The President The Stock Exchange

ที่ กบร No. Lor Gor. 023/2020 November 16, 2020 President The Stock Exchange of Thailand Re : Clarification on the company’s over 20% change in its operating results for 3rd quarter, 2020 Dear Sir

หน้า 1 จาก 1 Translation May 8, 2018 Subject: Management explanation and analysis for Quarter ended 31 March 2018 Attn: The Managing Director, the Stock Exchange of Thailand Pacific Pipe Public

Director and Manager The Stock Exchange of Thailand The Company would like to report the Company’s operating result for the 1st Quarter ended March 31, 2018 that total revenue was THB8.24 million decreased

หน้า 1 จาก 1 Translation February 22, 2019 Subject: Management explanation and analysis for Year ended 31 December 2018 Attn: The Managing Director, the Stock Exchange of Thailand Pacific Pipe Public

Translation August 9, 2017 Subject: Management explanation and analysis for Quarter ended 30 June 2017 Attn: The Managing Director, the Stock Exchange of Thailand Pacific Pipe Public Company Limited

Director and Manager The Stock Exchange of Thailand The Company would like to report the Company’s operating result for the year ended December 31, 2017 that total revenue was THB84.90 million increased by

1 - TRANSLATION - KT/PB (Q-Con) 012/2019 May 9, 2019. Attention Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis the first quarter ended 31 March 2019

หน้า 1 จาก 1 Translation August 8, 2018 Subject: Management explanation and analysis for Quarter ended 30 June 2018 Attn: The Managing Director, the Stock Exchange of Thailand Pacific Pipe Public