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

the 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

DOD BIOTECH PUBLIC COMPANY LIMITED 111 Moo 2 TambonThachin, Amphurmuangsamutsakhon, Samutsakhon 74000 Page 1 of 3 No. DOD026/2563 February 26, 2020 Subject Management Discussion and Analysis of for

หนังสือแสดงการรับทราบความผิด 27 February 2020 Subject : Management Discussion and Analysis of the year ended 31 December 2019 Attn. : Director and Manager The Stock Exchange of Thailand Encls. : A

February 28, 2020 Subject: Managing Discussion and Analysis for Year2019 To: Managing Director The Stock Exchange of Thailand The company would like to report to operation results for the company and

ending March 31, 2017 and 2016 consisted of the followings: (Unit: Million Baht) 2017 2016 - Current period income tax 0.55 0.32 - Income tax waiting for amortization (0.03) 0.95 Total 0.52 1.27 Analysis

1 (Translation) MD. 108/2017 Aug 7, 2017 Re: Management Discussion and Analysis For the Operating Results ended June, 2017 To: President The Stock Exchange of Thailand Management Discussion and

. Shareholders' Equity As of 30 June 2017, shareholders' Equity was Bt10,675 million, an increase of Bt685 million, mainly due to profit from the period and dividend payment. Analysis of performance Gross Profit

-Translation- 1 -Translation- Ref. NCH 049/2017 August 9, 2017 Subject : Management’s Discussion and Analysis Q.2/2017 Attention : President The Stock Exchange of Thailand N.C. Housing Plc. (“the

-Translation- 1 -Translation- Ref. NCH 049/2017 August 9, 2017 Subject : Management’s Discussion and Analysis Q.2/2017 (Revised) Attention : President The Stock Exchange of Thailand N.C. Housing Plc