profit. Please be informed accordingly. Sincerely Yours, ( Mr. Nipon Leelasithorn ) Chairman of the Executive Director, and Managing Director

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

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 - KT/KP (Q-CON) 007/2018 November 1st , 2018. Attention Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis the third quarter ended 30

1 - TRANSLATION - KT/PB (Q-Con) 004/2019 February 4,2019. Attention Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis for year 2018 Quality Construction

1 - TRANSLATION - KT/PB (Q-Con) 025/2019 November 1, 2019. Attention Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis the third quarter ended 30 September

1 - TRANSLATION - KT/PB (Q-Con) 007/2020 May 15, 2020. Attention Managing Director The Stock Exchange of Thailand Subject : Management Discussion and Analysis the first quarter ended 31 March 2020

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

2019-11-14 - ชี้แจงเปลี่ยนแปลงมากกว่า 20% Q3-2562 - ENG November 14, 2019 Subject: The clarification of the quarter 3/2019’s profit changing more than 20% Attention: The President The Stock Exchange