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

Acquisition/ Disposition Transaction Date % Group of Held Before Acquisition/ Disposition 2 % Group of Held Acquisition/ Disposition 2 % Group of Held After Acquisition/ Disposition 2 Remark 3 File No BCP

Acquisition/ Disposition Transaction Date % Group of Held Before Acquisition/ Disposition 2 % Group of Held Acquisition/ Disposition 2 % Group of Held After Acquisition/ Disposition 2 Remark 3 File No UREKA

of Acquisitor/Dispositor Search by Date   Transaction Date     Published Date   Date From To   Reports on Acquisition or Disposition of Securities (Form 246-2) ( 13 record(s) found) Name of Securities

Issuer Name of Acquisitor/Dispositor Search by Date   Transaction Date     Published Date   Date From To   Reports on Acquisition or Disposition of Securities (Form 246-2) ( 9 record(s) found) Name of

Issuer Name of Acquisitor/Dispositor Search by Date   Transaction Date     Published Date   Date From To   Reports on Acquisition or Disposition of Securities (Form 246-2) ( 10 record(s) found) Name of

Issuer Name of Acquisitor/Dispositor Search by Date   Transaction Date     Published Date   Date From To   Reports on Acquisition or Disposition of Securities (Form 246-2) ( 9 record(s) found) Name of

Issuer Name of Acquisitor/Dispositor Search by Date   Transaction Date     Published Date   Date From To   Reports on Acquisition or Disposition of Securities (Form 246-2) ( 9 record(s) found) Name of

Issuer Name of Acquisitor/Dispositor Search by Date   Transaction Date     Published Date   Date From To   Reports on Acquisition or Disposition of Securities (Form 246-2) ( 9 record(s) found) Name of

Issuer Name of Acquisitor/Dispositor Search by Date   Transaction Date     Published Date   Date From To   Reports on Acquisition or Disposition of Securities (Form 246-2) ( 9 record(s) found) Name of