Hydrotek Public Company Limited announced the appointment of Appointed Mr. Pramin Panthaveesak to be an Independent Director instead of Mr. Slib Soongsawang who resigned from the Company on February 8, 2022, with additional details appearing in the letter which the Company Sent to the Stock Exchange of Thailand on February 10, 2022, effective from February 28, 2022 onwards. Approve the change of authorized director of the Company. which will be effective from February 28, 2022 onwards.

Originally, Mr. Somchan Panjalak, Mr. Slib Soongsawang, Mr. Banjerd Thongcharoen and Mr. Somprasong Panjalak Two-quarter joint signature and company seal. Changed to Mr. Somchan Panjalak, Mr. Banjerd Thongcharoen and Mr. Somprasong Panjalak Two-thirds jointly signed and stamped with the company's seal.