E_1 Legal_FA_2015_12_29-c A CCoorrppLL44..11hhiigg A Executive Summary Management Discussion and Analysis For the Quarter Ended June 30, 2017 The global economy in the second quarter of 2017

Ref. No. IVL 007/05/2018 May 10, 2018 The President The Stock Exchange of Thailand Subject: Submission of Annual Audited Financial Statements and the Management Discussion and Analysis of Indorama

information memorandum on the Transaction to the Stock Exchange of Thailand (the “SET”) and send the circular notice to the shareholders of the Company within 21 days from the date that such information has

increased by Baht 11.24 million or an increase of 2.73 percent. Details of the changes or impacts are described in the Management Discussion and Analysis (MD&A) as attached herewith. Please be informed

1 Zen Corporation Group Public Company Limited 662 Soi Onnuch 17, Suanluang, Bangkok 10250 THAILAND. Tel: 02-0195000 24 February 2020 No. ZEN 2563-003 Subject Management Discussion and Analysis for

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

1 Zen Corporation Group Public Company Limited 662 Soi Onnuch 17, Suanluang, Bangkok 10250 THAILAND. Tel: 02-0195000 8 May 2020 No. ZEN 2563-011 Subject Management Discussion and Analysis for the 1st

previous year, the net profit of the Corporate Group for the 1st quarter 2020 increased by 1.56 percent. Details of the changes or impacts are described in the Management Discussion and Analysis (MD&A) as

-1- AIT (VP-SEC) 033E/2020 November 10, 2020 Subject: Management's Discussion and Analysis of Operating Results for Q3–2020 To: The President of The Stock Exchange of Thailand Summary of Operations

-1- AIT (VP-SEC) 026E/2020 August 10, 2020 Subject: Management's Discussion and Analysis of Operating Results for Q2-2020 To: The President of The Stock Exchange of Thailand Summary of Operations Q2