• HCS Group GmbH (INTERNATIONAL CHEMICAL INVESTORS HOLDING SE)
• Junyuan Petroleum Group
• Shell plc
• Thai Oil Public Company Limited (PTT Public Company Limited)
• Exxon Mobil Corporation
• LG Chem Ltd. (LG Corporation)
• Chevron Phillips Chemical Company LLC
• China Petrochemical Corporation (Sinopec Group)
• TRECORA (Balmoral Funds)