สารสนเทศข่าว มติ BOD 5-60 20171129En No. NDR013/2017 Subject Resolution of the Board of Directors’ Meeting To President The Stock Exchange of Thailand Enclosure 1. Information Memorandum on the

Transactions Deemed as Acquisition or Disposal of Assets, and the Notification of the Board of Governors of the Stock Exchange of Thailand Re: Disclosure of Information and Other Acts of Listed Companies

(Thailand) Co., Ltd., the investment in the ordinary shares of S-TREK (Thailand) Co., Ltd., capital increase, and the issuance and allocation of the newly issued ordinary shares to the specific person under

operating results for the 3-month period and 6-month period ending June 30, 2017 To : President The Stock Exchange of Thailand Diamond Building Products Public Company Limited and its Subsidiary (together

Ref. DBP. 141 / 2017 November 13, 2017 Subject : Clarification on Operating Results for the 3-Month Period and 9-Month Period ending September 30, 2017 To : President The Stock Exchange of Thailand

Ref. DBP. 111 / 2020 August 10, 2020 Subject : Clarification on Operating Results for the 2nd quarter and 6-month period ending June 30, 2020 To : President The Stock Exchange of Thailand Diamond

recorded in 4Q20 in amount of Bt246mn, with an approximately similar amount for the next four years. Market and Competitive Environment FY20 marked the beginning of the 5G network and service in Thailand

between the US and China, baht appreciation and pending of government expenditure as delay of government established. Having considered the above-mentioned circumstances, the Bank of Thailand lowered the

No. ECF2 044/2561 3 December 2018 Subject: Notification of the resolutions of the Board of Directors’ Meeting approving the investment in purchasing the ordinary shares of S-TREK (Thailand) Co., Ltd

Authority of Thailand (EGAT) because of the reserved shutdown following EGAT dispatch instruction; IRPC Clean Power Phase 1 (IRPC-CP Phase 1) ceased the gas turbine generator to commissioning with Phase 2 in