| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 3 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2024 |
| 4 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 5 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2024 |
| 6 | Scranton Exploration | Eastland, TX 76448 | Oil & Gas Operator | Dec 2024 |
| 7 | Serendipity Exploration, Inc. | Weatherford, TX 76087 | Gas Operator | May 1997 |
| 8 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 9 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Dec 2024 |
| 10 | Shaw, T. G. Oil Company, LTD. | Fort Worth, TX 76113 | Oil & Gas Operator | Dec 2024 |
| 11 | Sitton, Ronnie Incorporated | Graford, TX 76449 | Oil & Gas Operator | Feb 2020 |
| 12 | Skybridge Energy LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2024 |
| 13 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Dec 2024 |
| 14 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Dec 2024 |
| 15 | So Operating Company | Cisco, TX 76437 | Oil & Gas Operator | Dec 2024 |
| 16 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 17 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2024 |
| 18 | Square One Energy, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Oct 2015 |
| 19 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |
| 20 | Stellex | De Leon, TX 76444 | Oil & Gas Operator | Dec 2024 |
| 21 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2024 |
| 22 | Stewart & Porter | Mingus, TX 76463 | Oil & Gas Operator | Apr 2002 |
| 23 | Stewart Oil & Gas | Stephenville, TX 76401 | Gas Operator | Dec 2024 |
| 24 | Stonebriar Oil LLC | Frisco, TX 75034 | Oil & Gas Operator | Dec 2024 |
| 25 | Sun-Key Oil Co., Inc. | Dublin, TX 76446 | Oil & Gas Operator | Dec 2024 |
| 26 | Swaim, Charles | Tolar, TX 76476 | Oil & Gas Operator | Apr 2020 |
| 27 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2024 |