Corporate Level Membership
- BASF Corporation
- BP
- Dow
- INEOS
- Kuraray America Inc.
- SABIC
- Shell Oil Company
- Total Petrochemicals & Refining USA
- Valero
Site (facility) Members
- Ascend Performance Materials, Alvin, TX
- Axiall Corporation, a Westlake Company, Sulphur, LA
- Cheniere Energy, Inc., Houston, TX
- Eastman Chemical Company, Longview, TX
- Eastman Chemical Company, Texas City, TX
- Formosa Plastics Corporation, Point Comfort, TX
- Indorama Ventures, Port Neches, TX
- LyondellBasell Inudustries, Chanelview, TX
- Motiva - Port Arthur Manufacturing Complex, Port Arthur, TX
- Sasol North America, Sulphur, LA
- SNC-Lavalin, Al-Zour, Kuwait
- Westlake Chemical Corporation, Sulphur, LA