Ref. No. IVL 004/02/2020 26 February 2020 The President The Stock Exchange of Thailand Subject: Submission of Annual Audited Financial Statements and the Management Discussion and Analysis of

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. No. IVL 003/08/2020 13 August 2020 The President The Stock Exchange of Thailand Subject: Submission of Quarterly Review of Financial Statements and the Management Discussion and Analysis of

gain from foreign exchange of THB 92 million from THB appreciation, but realized a few loss from Yen depreciation. The company also received income tax refund from 2007 as revenue of THB 226 million

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

the company was voted for the third consecutive years. However, the company’s securities has selected in the SET High Dividend 30 Index or SETHD from the Stock Exchange of Thailand which the price index

for the third consecutive years. However, the company’s securities has selected in the SET High Dividend 30 Index or SETHD from the Stock Exchange of Thailand which the price index reference 30 shares

to investors in private placement, the acquisition of assets and convening the Extraordinary General Meeting of the Shareholders No. 1/2018 (Revise 2) To : President, The Stock Exchange of Thailand

IFA Jay Capital Advisory Company Limited SET The Stock Exchange of Thailand SEC The Securities and Exchange Commission Notification of the Acquisition or Disposition Notification of Capital Market