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

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 ACC1/19-055 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

หน้า 1 ของ 2 (Translation) No. ACC6511/001 November 14, 2023 Subject: Clarification of operating results for the third quarter of 2023 To: The President, The Stock Exchange of Thailand Advanced

หน้า 1 ของ 2 (Translation) No. ACC6702/001 February 28, 2024 Subject: Clarification of operating results for the Annual Year 2023 To: The President, The Stock Exchange of Thailand Advanced Connection

offered to the public but must be listed on the Stock Exchange of Thailand. For infrastructure trust with exceeding 30% of its investment in infrastructure project under construction, the unit trust will be

referral from the Stock Exchange of Thailand, the SEC's probe found that during July 27 - August 15, 2011, {A} sold 29 million {X1} Company shares in securities trading account of the {X2} Company. She

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

period of last year The explanation for Company’s Operation change from same period more than 20% To : The President, The Stock Exchange of Thailand T.C.J. Asia Public Company Limited (“TCJ”) and its

1 / 2 IR.019/2017 15 August 2017 Re: Clarification on the change of profit and loss statement To President The Stock Exchange of Thailand T Engineering Corporation Public Company Limited (the