| Stonehenge Appalachia LLC | Owner/operator | Westminster, CO | | 1 |
| Stonehenge Laurel Gathering, LLC | Owner/operator | Westminster, CO | | 1 |
| Stonewall Gas Gathering LLC | Owner/operator | | 2 | |
| Stonewater Pipeline Co. LP | Owner/operator | Oklahoma City, OK | | 3 |
| Streamline Midstream Inc. | Owner/operator | Alex, OK | | 2 |
| Strictland 1 - Sunray | Owner/operator | | | |
| Strike | Contractor | Spring, TX | 10 | |
| Strike Capital, LLC | | | | |
| Stroud Petroleum Inc | Owner/operator | Shreveport, LA | | 1 |
| Stupp | Pipe mill | | 2 | |
| Stupp Coatings, LLC | Contractor | | | |
| Suburban Gas Co | Owner/operator | | 1 | |
| Suburban Natural Gas Company | Owner/operator | | 1 | |
| Suburban Propane Partners LP | Owner/operator | | | 1 |
| Suffolk Transmission Partners, LP | Owner/operator | New Britain, CT | | |
| Suit-Kote Corp | Owner/operator | | | 1 |
| Sulphur River Exploration, Inc. | Owner/operator | Dallas, TX | | 3 |
| Sulphur River Gathering LLC | Owner/operator | Dallas, TX | | 21 |
| Sulphur River Resources, L.c. | Owner/operator | | | |
| Sumas Cogeneration Co., L.p. | Owner/operator | | | |
| Summit Appalachia Operating Company, LLC | Owner/operator | Magnolia, TX | | 1 |
| Summit Gas Gathering, LLC | Owner/operator | Fort Worth, TX | | 1 |
| Summit Midstream Partners | Contractor, Owner/operator | Houston, TX | 4 | 4 |
| Summit Midstream Permian 2 LLC | Owner/operator | Houston, TX | | 1 |
| Summit Midstream Permian, LLC | Owner/operator | | | 2 |
| Summit Natural Gas Of Maine, Inc. | Owner/operator | Centennial, CO | | 1 |
| Summit Natural Gas Of Missouri | Owner/operator | Centennial, CO | | 1 |
| Summit Permian Transmission, LLC | Owner/operator | | 1 | |
| Summit Petroleum Corp | Owner/operator | Mount Pleasant, MI | | 1 |
| Summit Petroleum Corp - Gas Div. | Owner/operator | Mount Pleasant, MI | | 1 |
| Summit Resources | Owner/operator | | | 1 |
| Summit Utilities Inc. | Owner/operator | Centennial, CO | | 1 |
| Sunbridge Energy Services, LLC | Owner/operator | Midland, TX | | 2 |
| Suncor Energy (usa) Pipeline Co. | Owner/operator | Cheyenne, WY | | 2 |
| Suncor Energy USA | Owner/operator | | | 1 |
| Sundown Energy, LLC | Owner/operator | Dallas, TX | | 2 |
| Sunflower Electric Holdings, Inc | Owner/operator | | | |
| Sunflower Electric Power Corp | Owner/operator | Hays, KS | | 1 |
| Sunland Construction, Inc. | Contractor, Owner/operator | Eunice, LA | 32 | |
| Sunland Field Services, Inc. | Contractor | Carthage, TX | | |
| Sunoco Inc Eagle Point Facility | Owner/operator | | | |
| Sunoco Logistics | Owner/operator | | 4 | 40 |
| Sunoco Midland Gathering LLC | Owner/operator | Houston, TX | | 1 |
| Sunoco Partners Marketing & Terminals LP | Owner/operator | | | |
| Sunoco Partners NGL Facilities LLC | Owner/operator | | | 1 |
| Sunoco Pipeline L.p. | Owner/operator | Houston, TX | 2 | 16 |
| Sunoco Wholesale LLC | Owner/operator | | | 5 |
| Sunoco, Inc (r&m) | Owner/operator | Philadelphia, PA | | 3 |
| Sunoco, LLC | Owner/operator | Dallas, TX | | 28 |
| Sunrise Pipeline LLC | Owner/operator | | 1 | |