. YUTH VORACHATTARN CHAIRMAN OF THE BOARD OF DIRECTORS / INDEPENDENT DIRECTOR / AUDIT COMMITTEE 2. Mr. ITTHIPAT PEERADECHAPAN CHIEF EXECUTIVE OFFICER / DIRECTOR 3. Mr. SOMBOON PRASITJUTRAKUL DIRECTOR 4

Transactions B.E. 2546 (as amended). Please be informed accordingly. Sincerely yours, U City Public Company Limited ________________________________ (Ms. Piyaporn Phanachet) Director and Chief Executive Officer

informed accordingly, Respectfully yours, -Weera Louwitawas- (Mr. Weera Louwitawas) Chief Executive Officer 75% Higashi Nihon Mega Solar 3 (GK) Kurihara (GK) AE Power (GK) 99.99% 99.99% 99.99% 99.99% 99.99

December 31, 2019 and September 30, 2020, the shareholders’ equity was valued at Baht 1,317.48 million and Baht 1,316.83 million, respectively. Yours sincerely (Mr. Teerawat Srinakarin) Chief Executive

accordingly. Yours truly, -Mr. Wichien Paetthayanan- Mr. Wichien Paetthayanan Chief Executive Officer

. The increase in shareholders’ equity was thanks to the booking of operating profit. Yours sincerely (Mr. Teerawat Srinakarin) Chief Executive Officer

accordingly. Yours faithfully, For and on behalf of Diamond Building Products Public Company Limited (Mr. Satid Sudbuntad) Chief Executive Officer - 1 - DIAMOND BUILDING PRODUCTS PUBLIC COMPANY LIMITED AND ITS

Sudbuntad) Chief Executive Officer Company Secretary Office Tel. +66 3622 4171-8 Ext. 314 Fax. +66 3622 4187 - 1 - DIAMOND BUILDING PRODUCTS PUBLIC COMPANY LIMITED AND ITS SUBSIDIARY MANAGEMENT DISCUSSION AND

Analysis (MD&A) as 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 - 1

Sudbuntad) Chief Executive Officer - 1 - DIAMOND BUILDING PRODUCTS PUBLIC COMPANY LIMITED AND ITS SUBSIDIARY MANAGEMENT DISCUSSION AND ANALYSIS (For the Consolidated Financial Statements of the 2nd Quarter