the year ended December 31, 2019 To Director and Manager the Stock Exchange of Thailand According to the Board of Directors’ Meeting No.2/ 2 0 2 0 of DOD Biotech Public Company Limited ( “ the Company

วันที่ 25 กุมภาพันธ์ 2558 February 23, 2018 Subject: Management’s Discussion and Analysis for the year ended December 31, 2017 Attention: Director and Manager The Stock Exchange of Thailand LDC

No. ADD-IR2021/001 19 May 2021 Subject: Management discussion and analysis for the performance for the three-month period ended 31 March 2021 To: President The Stock Exchange of Thailand AddTech Hub

ACC1/19-007 February 18, 2019 Subject: Management Discussion and Analysis for the year ended December 31, 2018 To: Director and Managing Director The Stock Exchange of Thailand Qualitech Public

ACC1/20-012 February 25, 2020 Subject: Management Discussion and Analysis for the year ended December 31, 2019 To: Director and Managing Director The Stock Exchange of Thailand Qualitech Public

Ref. No. 132 /2560 10 August 2017 SUBJECT : 2Q/2017 reviewed financial statements and related comments. ATTN : The President Stock Exchange of Thailand Attachment : The reviewed financial statements

จดหมายชี้แจงq260e August 15, 2017 The Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis for three month Ending 30 June 2017 Summary on Second Quarter

Translation November 10, 2017 Subject: Management explanation and analysis for Quarter ended 30 September 2017 Attn: The Managing Director, the Stock Exchange of Thailand Pacific Pipe Public Company

จดหมายชี้แจงq360e November 14, 2017 The Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis for three month Ending 30 September 2017 Summary on third Quarter

At Hor-For 0126/2550 February 23th, 2018 At Hor-For 0020/2561 Subject Notification of the performance of 2017 Attn Directors and Manager, The Stock Exchange of Thailand We, Hwa Fong Rubber (Thailand