?- Alpek S.A.B. de C.V.
- BASF SE
- BEWiSynbra Group
- INEOS Styrolution Group GmbH
- KANEKA CORPORATION
- Ming Dih Group Corporation
- NOVA Chemicals Corporate
- Ravago
- SABIC
- SIBUR International GmbH
- StyroChem
- Sundolitt Ltd.
- SUNPOR
- Synthos
- Total
- Unipol Holland B.V.
- Versalis S.p.A.