Stock Exchange of Thailand Enclosure: 1. Information Memorandum Re: Acquisition of Assets of T.K.S. Technologies Public Company Limited (Schedule 1) 2. Information Memorandum Re: the Allocation of the

Shareholders in Proportion to their Respective Shareholdings and Convening of the Extraordinary General Meeting of Shareholders No. 1/2018 (Second Amendment) To: President The Stock Exchange of Thailand

Ref. DBP. 024 / 2020 February 25, 2020 Subject : Clarification on Operating Results of Year 2019 To : President The Stock Exchange of Thailand Diamond Building Products Public Company Limited and its

Meeting of Shareholders’ agenda (additional) To President The Stock Exchange of Thailand Reference: 1. The letter to the Stock Exchange of Thailand of East Coast Furnitech Public Company Limited on the

1 Translation CEN 015-2019 November 14, 2019 Subject : Management Discussion and Analysis for business operation in Quarter 3-2019 To : The Manager and President The Stock Exchange of Thailand

Letter to SET Interim Dividend and RPT ( E ) Final.pdf (-Translation-) Ref. SorNor. 098/2020 May 13, 2020 To: President The Stock Exchange of Thailand Re: Notification of interim dividend payment

Meeting of Shareholders’ agenda To President The Stock Exchange of Thailand Reference: 1. The letter to the Stock Exchange of Thailand of East Coast Furnitech Public Company Limited on the resolutions of

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

% yoy) because EBITDA from FA business was lower due to stock loss as CPKO price drop. Moreover, the company recognized profit of THB 20 million from investments in the Thai Ethoxylate Company Limited

discount since the demand and supply of biodiesel close to equilibrium. With deducting the effect of Stock Gain & NRV of THB 92 million, the Company had Adjusted EBITDA of THB 253 million, an increase of 18