| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S & M Royalty | Andrews, TX 79714 | Oil & Gas Operator | Jan 1997 |
| 3 | Saber Oil & Gas Ventures, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 4 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 5 | Sagebrush Oilandgas Company,LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2010 |
| 6 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 7 | Sammax Operating LLC | Snyder, TX 79549 | Oil Operator | Oct 2025 |
| 8 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 9 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 10 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 11 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Oct 2025 |
| 12 | Satanta Oil Company | Midland, TX 79704 | Oil & Gas Operator | Oct 2025 |
| 13 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 14 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 15 | Schlachter, David A., Estate Of | Dallas, TX 75225 | Oil & Gas Operator | Jan 2000 |
| 16 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 17 | SDX Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 18 | Seaboard Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 19 | Seal Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2006 |
| 20 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 21 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 22 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 23 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 24 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 25 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Oct 2025 |
| 26 | Simmons, L.B. Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2000 |
| 27 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Oct 2025 |
| 28 | Slagel, H. P. Prod. Co. | Snyder, TX 79550 | Oil & Gas Operator | Dec 2006 |
| 29 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 30 | Smith Vacuum Service | Snyder, TX 79550 | Oil & Gas Operator | Oct 2025 |
| 31 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 32 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 33 | Spalding Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 34 | Special JHR Corp | Bridgeville, PA 15017 | Oil & Gas Operator | Oct 2025 |
| 35 | Springfield Oil Services, Inc. | Mamaroneck, NY 10543 | Oil & Gas Operator | Oct 2025 |
| 36 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 37 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 38 | Sterlynn Oil & Gas, Inc. | Harper, TX 78631 | Oil Operator | Oct 2025 |
| 39 | Stonegate Operators, Inc. | Addison, TX 75001 | Oil Operator | Oct 2025 |
| 40 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 41 | Strawn Petroleum Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 42 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |
| 43 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Oct 2025 |
| 44 | SWJN Oil Company | Kilgore, TX 75663 | Oil Operator | Oct 2025 |