JANUARY 28, 2021 FEBRUARY 10, 2021 SUPPORTING STRATEGIES TO ENHANCE COMPETITIVENESS GC AND PTT SIGNED A COLLABORATION AGREEMENT UNDER PROJECT ONE GC signed on as a PTT PLC Project ONE collaborator at PTT headquarters, continuing their collaboration on value creation driven by supply & trading optimization that will lead to sustainable growth to the PTT Group, while ensuring power stability and enhanced competitiveness in the country. GC SIGNED AGREEMENT WITH SAMSUNG ENGINEERING TO IMPROVE THE OLEFINS 2 FACTORY, ENSURING FLEXIBILITY IN USING THE MATERIAL, WHILE BUILDING ON THEIR DOWNSTREAM PETROCHEMICAL BUSINESS GC held a signing ceremony for the Olefins 2 Modification Project (OMP) between GC, Samsung Engineering (South Korea) Ltd., and Samsung Engineering (Thailand) Co., Ltd. The project is a part of the Step Change strategy to ensure flexibility in using propane as feedstock, adding value to the downstream business, while enhancing competitiveness. GC signed an engineering design agreement to procure machinery and construction equipment. Commercial manufacturing is expected to begin in the first quarter of 2023 with investment value of 165 million US dollars or Baht 5.198 billion. 14 PTT GLOBAL CHEMICAL PUBLIC COMPANY LIMITED Form 56-1 One Report 2021