herewith. Please be informed accordingly. Yours faithfully, For and on behalf of Diamond Building Products Public Company Limited (Mr. Satid Sudbuntad) Chief Executive Officer - 1 - DIAMOND BUILDING PRODUCTS

, Teerawit Charuwat (Mr. Teerawit Charuwat) Director and Chief Executive Officer

notification of the Securities and Exchange Commission and the SET. Please be informed accordingly. Sincerely Yours, Prachuab Ujjin ( Mr. Prachuab Ujjin ) Director and Chief Executive Officer

, Prachuab Ujjin ( Mr. Prachuab Ujjin ) Director and Chief Executive Officer

attached herewith. Please be informed accordingly. Yours faithfully, For and on behalf of Diamond Building Products Public Company Limited (Mr. Satid Sudbuntad) Chief Executive Officer Company Secretary

quarter of 2019 (a copy in Thai and English) Please be informed accordingly. Sincerely yours, (Mr. Aloke Lohia) Group CEO Indorama Ventures Public Company Limited Company Secretary Tel: +662 661 666 Fax

Company’s Board of Directors approves the Company and/or subsidiary companies to enter into the transaction. Please be informed accordingly. Sincerely yours, M.K. Real Estate Development PCL -SIGN- (Mr

informed accordingly. Yours faithfully, For and on behalf of Diamond Building Products Public Company Limited (Mr. Satid Sudbuntad) Chief Executive Officer Company Secretary Office Tel. +66 3622 4171-8 Ext

quarter of 2020 (a copy in Thai and English) Please be informed accordingly. Sincerely yours, Mr. Aloke Lohia Group CEO Indorama Ventures Public Company Limited Company Secretary Tel: +662 661 6661 Fax

quarter of 2020 (a copy in Thai and English) Please be informed accordingly. Sincerely yours, (Mr. Aloke Lohia) Group CEO Indorama Ventures Public Company Limited Company Secretary Tel: +662 661 6661 Fax