AC 52/07-003 ACC1/19-019 May 13, 2019 Subject: Management Discussion and Analysis Quarter 1 Ending March 31, 2019 To: Director and Managing Director The Stock Exchange of Thailand Qualitech Public

AC 52/07-003 ACC1/19-042 August 13, 2019 Subject: Management Discussion and Analysis Quarter 2 Ending June 30, 2019 To: Director and Managing Director The Stock Exchange of Thailand Qualitech Public

AC 52/07-003 ACC1/18-048 November 12, 2018 Subject: Management Discussion and Analysis Quarter 3 Ending September 30, 2018 To: Director and Managing Director The Stock Exchange of Thailand Qualitech

AC 52/07-003 ACC1/20-030 May 11, 2020 Subject: Management Discussion and Analysis Quarter 1 Ending March 31, 2020 To: Director and Managing Director The Stock Exchange of Thailand Qualitech Public

AC 52/07-003 ACC1/19-055 November 11, 2019 Subject: Management Discussion and Analysis Quarter 3 Ending September 30, 2019 To: Director and Managing Director The Stock Exchange of Thailand Qualitech

. Sukrit Choradol. The sales were made in a way that took advantage of others by using non-public information material to DEMCO share price concerning the operating results for the third quarter of 2015

Page 1 of 2 ACC6711/003 November 14, 2024 Subject: Clarification of operating results for the third quarter of 2024 ended September 30, 2024 Dear Directors and Managers Stock Exchange of Thailand

May 15, 2018 Subject: Managing Discussion and Analysis for Q1/2018 To: Managing Director The Stock Exchange of Thailand The company would like to report to operation results for the company and

ชี้แจงผลการดำเนินงานของบริษัทและบริษัทย่อยประจำปี 2549 UKEM004/2020 February 25, 2020 Subject : Management Discussion and Analysis of Business Operation results for Year 2019 To : Director and

operation results for the year 2017, the Company would like to provide the clarification of performance which was decreased more than 20% compared to the previous year. For the year 2017, the operating