- Acadian Pipeline Company
- Anglo-Suisse
- Apache Corporation
- Arena Offshore
- Arizona Public Services
- Aspen Operating
- BG North America, LLC
- Boardwalk Pipeline
- Callon Petroleum
- Castex Energy
- C12 Energy
- Century Exploration
- CF Industries
- Chevron
- ConocoPhillips
- Denbury Onshore, LLC
- Eagle Rock Energy
- Energy XXI
- Entergy LA, LLC
- Enterprise Products
- Euroil
- Expert Oil and Gas
- Mobil Equatorial Guinea, Inc.
- Formosa Plastics
- Gibson Energy
- Gulf South Pipeline Co., LP
- Harvest Pipeline Co.
- Helis Oil & Gas, L.L.C.
- Hess Corporation
- Husky Energy
- IMTT
- Kinder Morgan
- Kinder Morgan CO2
- Legado Resources
- LOOP, LLC
- Marathon Petroleum Co.
- Marlin Exploration
- MC Offshore
- Noble Energy
- PCS Nitrogen
- PetroSantander, Inc.
- Phillips 66
- Placid Refining Co.
- Plains All American, L.P.
- Plains Marketing, L.P.
- Plains Midstream Canada
- QEP Resources
- Red Cedar Gathering
- Renaissance Offshore, LLC
- Resolute Energy
- Seneca Resources
- Targa Resources
- Tarpon Operating & Development
- Tellus Operating
- Toshiba Corporation
- TransCanada Co.
- Valero St. Charles Refinery
- Williams Midstream
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