| 1 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 2 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 3 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Oct 2025 |
| 4 | Sample Exploration | | Oil & Gas Operator | Jul 2002 |
| 5 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 6 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 7 | Sananco Energy Corp | Naples, FL 33941 | Oil & Gas Operator | Jul 2013 |
| 8 | Sawyer Drilling & Service Inc. | | Oil & Gas Operator | Oct 2004 |
| 9 | Sawyer Energy, Inc. | | Oil & Gas Operator | May 1997 |
| 10 | Saye Petroleum, Inc. | | Oil & Gas Operator | Apr 1995 |
| 11 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 12 | Sepulvado Oilfield Service Inc | | Oil & Gas Operator | Jul 2010 |
| 13 | Shoreline Exploration, Inc. | | Oil & Gas Operator | Jul 1990 |
| 14 | Shoreline Petroleum Corp. | Channelview, TX 77530 | Oil & Gas Operator | Sep 2003 |
| 15 | Shufflin Energy | | Oil & Gas Operator | Sep 2011 |
| 16 | Sierra Industries, Inc. | | Oil & Gas Operator | Apr 1989 |
| 17 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 18 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | Oct 2025 |
| 19 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | May 2025 |
| 20 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 21 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 22 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 23 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 24 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 25 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 26 | South La. Production Co., Inc. | | Oil & Gas Operator | Jun 1982 |
| 27 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 28 | Southern Water Disposal, LLC | | Oil & Gas Operator | Jan 2025 |
| 29 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2025 |
| 30 | Spicy Daugx Operators Louisiana LLC | | Oil & Gas Operator | Nov 2024 |
| 31 | Spyglass Oil & Gas LLC | | Oil & Gas Operator | Dec 2024 |
| 32 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 33 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 34 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Oct 2025 |
| 35 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 36 | Summit Energy, Inc. | Littleton, CO 80127 | Oil & Gas Operator | Aug 2013 |
| 37 | Summit Gas LLC | | Oil & Gas Operator | Oct 2011 |
| 38 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 39 | Sun Resources Texas, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2024 |
| 40 | Sundance Energy Corporation | | Oil & Gas Operator | Jan 2025 |
| 41 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2025 |
| 42 | Superior Operating LLC | | Oil Operator | May 2020 |
| 43 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 44 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |