No. WHAUP-CS021/2017 2 October 2017 Subject: Notification of Information Memorandum of Related Party Transaction in Relation to Share Purchase and Taking Assignment of Claims in Loan To: President

BOD Resolution Ref U. SET 008/2018 14 February 2018 Subject: Summary of Operating Performance and Financial Status for Quarter 4/2017 and for the Year Ended 31 December 2017 To: President The Stock

Microsoft Word - letYQ118MD&AE .doc ( Translation ) 14th May 2018 Subject: Management Discussion and Analysis (MD&A) for the 1st quarter period of year 2018 To: Managing Director of the Stock

of shareholding proportion by buying of 23% newly issued common shares of Ekachai International Co., Ltd., which is Ekachai Medical Care PCL. subsidiary. To : Directors and Manager The Stock Exchange

AC 52/07-003 ACC1/19-056 11 November 2019 Subject : The Purchase of the Ordinary Shares of Duwell Intertrade Co., Ltd. To: Director and Managing Director The Stock Exchange of Thailand Qualitech

. convertible debenture or warrant, at the offering price lower than 90% of the market price of the Company’s share (4) When the Company makes partial or whole stock dividend payment to its shareholders. (5) When

T.K.S. TECHNOLOGIES 11 August 2020 Re: Management Discussion and Analysis for Quarter 2/2020 To: President The Stock Exchange of Thailand T.K.S. Technologies Public Company Limited (“TKS”) and its

1 -Translation- Ref :IR 62/023 December 23, 2019 Subject: Change in Shareholding Structure of Subsidiary Company (edit) To: President, The Stock Exchange of Thailand T.K.S. Technologies Public

1 -Translation- Ref :IR 62/023 December 23, 2019 Subject: Change in Shareholding Structure of Subsidiary Company (edit no.2 ) To: President, The Stock Exchange of Thailand T.K.S. Technologies Public

Shares of Taitanan Company Limited (a Joint Venture Company) To : President, The Stock Exchange of Thailand Enclosure : Information Memorandum Concerning the Acquisition of Nava Nakorn Public Company