MJD.IR.005/2020 15 May 2020 Subject : Clarification of the operating result for the year 2020 ended March 31, 2020 Attention : Director and Managing Director The Stock Exchange of Thailand Major

MJD.IR.011/2020 14 August 2020 Subject : Clarification of the operating result for the year 2020 ended June 30, 2020 Attention : Director and Managing Director The Stock Exchange of Thailand Major

ACC6206/004 28 June 2019 Subject Inform the progress of the sale stock in the subsidiary company To Director/ Managing Director The Stock Exchange of Thailand According to the meeting of the Board of

ACC1/18-042 6 September 2018 Subject : The Information of a Disposition of Assets of the Subsidiary (Revise) To: Director and Managing Director The Stock Exchange of Thailand Qualitech Public Company

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

1 - TRANSLATION - VS/PC (Q-CON) 026/2018 August 06th , 2018. Attention Director and Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis the second quarter

1 - TRANSLATION - VS/PC (Q-Con) 004/2018 February 1st , 2018. Attention Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis for year 2017 Quality

1 - TRANSLATION - VS/PC (Q-CON) 016/2018 May 10th , 2018. Attention Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis the first quarter ended 31 March 2018

1 - TRANSLATION - KT/PB (Q-Con) 001/2020 February 13, 2020. Attention Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis for year 2019 Quality Construction

performance for 3-month period ended September 30, 2017. To Managing Director The Stock Exchange of Thailand The Operating results of the company and its subsidiaries for the 3-month period ended September 30