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

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

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

ชี้แจงผลการดำเนินงานของบริษัทและบริษัทย่อยประจำปี 2549 UKEM004/2019 February 27, 2019 Subject : Management Discussion and Analysis of Business Operation results for Year 2018 To : Director and

UKEM010/2019 May 13, 2019 Subject : Management Discussion and Analysis of Business Operation results for

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

จดหมายชี้แจงq262e August 14, 2019 The Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis for three month Ending 30 June 2019 Summary on Second Quarter

ชี้แจงผลการดำเนินงานของบริษัทและบริษัทย่อยประจำปี 2549 UKEM013/2018 May 11, 2018 Subject : Management Discussion and Analysis of Business Operation results for Quarter 1/2018 To : Director and

จดหมายชี้แจงq261e August 14, 2018 The Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis for three month Ending 30 June 2018 Summary on Second Quarter

UKEM021/2018 September 12, 2018 Subject : Management Discussion and Analysis of Business Operation