May 25, 2017 Subject: Notification on the Acquisition of Assets of AAPICO Hitech Public Company Limited To: The President The Stock Exchange of Thailand Enclosure: Information Memorandum Concerning the

received the Top Innovative Organization Award 2018, which was arranged by National Innovation Agency (Public Organization), The Stock Exchange of Thailand (SET), Market for Alternative Investment (MAI) and

management and operation. Presently, the Company holds 99.83% of the total issued and sold shares of GLOW and has completed the delisting of GLOW securities from the Stock Exchange of Thailand on 13 December

reference. Notification of the Capital Market Supervisory Board No. Tor Jor. 12/2558 Re: Offering of Units of Infrastructure Trusts ___________________ By virtue of Section 16/6 of the Securities and Exchange

Meeting No. 1/2019 To President The Stock Exchange of Thailand Enclosure 1. Information Memorandum on the Asset Acquisition (Addendum 1) regarding acquisition of shares of S-TREK (Thailand) Co., Ltd. in the

contracts with customers” (TFRS 15), foreign exchange, and deferred tax asset. Normalized net profit clearly reflects the company's true earnings from its normal operations. In Q1/2019, the NNP was Baht 1,053

คำอธิบายและการวิเคราะห์ของฝ่ายจัดการ 10 May 2018 Re: To clarify the financial statements as of 31 March 2018 To: President The Stock Exchange of Thailand WHA Corporation Public Company Limited (the

ที่ กตพ Ref. DBP. 030 / 2019 February 20, 2019 Subject : Clarification on Operating Results of Year 2018 To : President The Stock Exchange of Thailand Diamond Building Products Public Company Limited

ที่ กตพ Ref. DBP. 073 / 2019 May 13, 2019 Subject : Clarification on Operating Results for the 1st quarter ending March 31, 2019 To : President The Stock Exchange of Thailand Diamond Building

ที่ กตพ Ref. DBP. 107 / 2018 August 14, 2018 Subject : Clarification on Operating Results for the 3-month Period and 6-month Period ending June 30, 2018 To : President The Stock Exchange of Thailand