| 1 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 2 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 3 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 4 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 5 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 6 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 7 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Jun 2025 |
| 8 | Sandlot Oil & Gas LLC | Gruver, TX 79040 | Oil & Gas Operator | Oct 2025 |
| 9 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 10 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 11 | Scheriger Production | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 12 | SCS Newton Oil LLC | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 13 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 14 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 15 | SGP Operating LLC | Dallas, TX 75205 | Oil & Gas Operator | Oct 2025 |
| 16 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 17 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 18 | Skinner, Robert V. | Spearman, TX 79081 | Oil & Gas Operator | Aug 2008 |
| 19 | Skinnergy Co. | Spearman, TX 79081 | Oil & Gas Operator | Oct 2025 |
| 20 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 21 | Smith & Marrs Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2021 |
| 22 | Sonat Exploration Company-MCR | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 23 | Southcross Operating LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2005 |
| 24 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 25 | Spoonemore Brothers | Spearman, TX 79081 | Oil & Gas Operator | Nov 2019 |
| 26 | Spring Resources, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2007 |
| 27 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 28 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 29 | Stonetown Properties, LTD. | Amarillo, TX 79114 | Oil & Gas Operator | Dec 2016 |
| 30 | Strand Energy, Inc. (I) | Houston, TX 77002 | Oil & Gas Operator | Sep 1996 |
| 31 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 32 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 33 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 34 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 35 | Sunlight Exploration, Inc. | Canyon, TX 79015 | Oil & Gas Operator | Oct 2025 |
| 36 | Sunstone Energy Company | Tulsa, OK 74153 | Oil & Gas Operator | Aug 2009 |
| 37 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 38 | Sutherland Energy Co., LLC | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2025 |
| 39 | Swope Corp. | Austin, TX 78735 | Oil & Gas Operator | Oct 2025 |