- Chevron Pasadena Refining
- Dow Chemical Company
- ECO Services Operations, LLC
- Enterprise Crude Pipeline, LLC
- ExxonMobil Pipeline Company
- ExxonMobil Refining & Supply Company
- INEOS Americas LLC
- Kirby Corporation
- LBC Houston, L.P.
- Energy Transfer Mont Belvieu NGLs LP
- Lyondellbasell Chemicals
- Lyondellbasell Houston Refining LP
- ONEOK - Magellan Terminals Holdings
- ONEOK - MVP Terminalling, LLC
- Odfjell Terminals (Houston) L.P.
- Olin Pipeline Services
- PEMEX Deer Park
- Shell Chemicals LLC
- Shell Pipeline Company
- Targa Downstream LLC
- Valero Refining-Texas, L.P.
- Boardwalk Pipelines