-Translation- Ref. No. PorBor. 050 / 2019 December 27, 2019 Subject: Entering into Transaction of Acquisition of Associate Company’s ordinary shares To: President The Stock Exchange of Thailand

. 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

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

Type of securities : Common share | Effective Date : 10/06/2023 | Close Selling Date : 16/08/2023

Type of securities : Common share | Effective Date : 02/02/2004 | Close Selling Date : 04/03/2004

Type of securities : Common share | Effective Date : 26/03/2004 | Close Selling Date : 02/04/2004

Type of securities : Common share | Effective Date : 24/03/2004 | Close Selling Date : 02/04/2004

Type of securities : Common share | Effective Date : 22/03/2004 | Close Selling Date : 26/03/2004

Type of securities : Common share | Effective Date : 15/03/2004 | Close Selling Date : 19/03/2004