| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | Safari Production Company, Inc. | McAllen, TX 78501 | Oil & Gas Operator | Nov 2024 |
| 3 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Sep 2024 |
| 4 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 5 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2024 |
| 6 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 7 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 8 | Satex Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 9 | Saxet Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Mar 2004 |
| 10 | Saxet Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2024 |
| 11 | Sbog, LLC | Granbury, TX 76048 | Oil & Gas Operator | Feb 2021 |
| 12 | Scheriger Production | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 13 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 14 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Nov 2024 |
| 15 | Silver Fox Oil & Gas LLC | Hebbronville, TX 78361 | Oil & Gas Operator | Nov 2024 |
| 16 | Single Barrel Oil And Gas LLC | Granbury, TX 76048 | Oil & Gas Operator | Nov 2024 |
| 17 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2024 |
| 18 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Nov 2024 |
| 19 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Nov 2024 |
| 20 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 21 | Sparta Exploration LLC | Houston, TX 77279 | Oil & Gas Operator | Nov 2024 |
| 22 | Starco Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Nov 2024 |
| 23 | Starr Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Nov 2024 |
| 24 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Nov 2024 |
| 25 | Stivers Inc | Graham, TX 76450 | Oil & Gas Operator | May 2003 |
| 26 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 27 | Suemaur Exploration, Inc. | Corpus Chrsti, TX 78470 | Oil & Gas Operator | Mar 2008 |
| 28 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |