13_MDA Q1_2563 EN -Translated Version- No. ECF2 018/2020 May 15, 2020 Subject: Management Discussion and Analysis of the 1st quarter ended 31 March, 2020 To President The Stock Exchange of Thailand

No. ED-MD2020-0008 March 12, 2020 Subject: Announcement of schedule AGM for the year 2020 and omission of dividend for year 2019. Attention: The President,The Stock Exchange of Thailand The Meeting

Ref. DBP. 066 / 2020 May 11, 2020 Subject : Clarification on Operating Results for the 1st Quarter ending March 31, 2020 To : President The Stock Exchange of Thailand Diamond Building Products Public

securities business in the category of mutual fund management; (15) “Stock Exchange” means the Stock Exchange of Thailand. Clause 2. This Notification shall apply to securities underwriting made for a

category of mutual fund management; (15) “Stock Exchange” means the Stock Exchange of Thailand. Clause 2. This Notification shall apply to securities underwriting made for a securities offeror who is obliged

management company” means a securities company licensed to undertake securities business in the category of mutual fund management; (15) “Stock Exchange” means the Stock Exchange of Thailand. Clause 2. This

investment on assets (Revision 2) Attention: Directors and Managers The Stock Exchange of Thailand Attachment: 1. Information on the investment on assets 2. F53-4 form 3. Details on the issuance of warrants to

สารสนเทศข่าว มติ BOD 5-60 Final 20171126 En No. NDR013/2017 Subject Resolution of the Board of Directors’ Meeting To President The Stock Exchange of Thailand Enclosure 1. Information Memorandum on 2

some customer ending the distribution contract with some retailer which resulted in reduced sales volume since Q4/2017. Meanwhile there was some customer changing the sales format from export to domestic

December 2019 To: Managing Director of the Stock Exchange of Thailand Business Overview In 2019, the impact of trade war between the United States and China, together with the global economic slowdown caused