- Chevron Phillips Chemical Company
- DuPont de Nemours Inc.
- Eastman Chemical Company
- Exxon Mobil Corporation
- Hexion
- INEOS
- LyondellBasell Industries Holdings BV
- Mitsubishi Chemical Corporation (MCC)
- Nova Chemicals Corporation
- Saudi Aramco
- SABIC
- Sinopec
- Kumho Petrochemical
- TSRC
- Goodyear