Ujjin ) Director and Chief Executive Officer

informed accordingly. Sincerely yours, T.K.S. Technologies Public Company Limited -Signed- Mr.Somkid Wekinvattanasaed Managing Director

September 3rd,2019 To : Managing Director The Stock Exchange of Thailand Re : The acquisition of investment in Thonburi Healthcare Group PLC. The board of directors of Ramkhamhaeng Hospital Public Co

the investors. Yours sincerely, (Mr. Somboon Fusriboon) Managing Director

หนา้ 1 จาก 1 Translation November 13, 2019 Subject: Management explanation and analysis for Quarter ended 30 September 2019 Attn: The Managing Director, the Stock Exchange of Thailand Pacific Pipe

January 9th, 2020 To : Managing Director The Stock Exchange of Thailand Re : The acquisition of investment in Vibharam Co.,Ltd.’s new ordinary shares, and elder ordinary share which purchases from

: P.J. Composite Co.,Ltd P.J. Composite Co.,Ltd has the same director and shareholder with the Company who is Mr. Pirun Hemmondharop. He holds a 6.22 percent of share in the Company. He is also a director

. Somkiat Vongsarojana) Managing Director As the Planner

หนา้ 1 จาก 1 Translation May 13, 2020 Subject: Management explanation and analysis for Year ended 31 March 2020 Attn: The Managing Director, the Stock Exchange of Thailand Pacific Pipe Public Company

, Boondee Amnuayskul (Mr. Boondee Amnuayskul) Chief Executive Officer and Managing Director