| 1 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 2 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 3 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 4 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2024 |
| 5 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 6 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 7 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | May 2024 |
| 8 | Santos USA Corp. | Houston, TX 77042 | Oil & Gas Operator | Dec 2008 |
| 9 | Saxet Operating Co.,Inc. | Madisonville, TX 77864 | Oil & Gas Operator | May 2024 |
| 10 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | May 2024 |
| 11 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 12 | Seidler Oil & Gas Operating, LLC | Alvarado, TX 76009 | Oil & Gas Operator | May 2024 |
| 13 | Sem Operating Company LLC | Houston, TX 77042 | Oil & Gas Operator | May 2024 |
| 14 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 15 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 16 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 17 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 18 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 19 | Sonora Petroleum Corp. | Austin, TX 78734 | Oil & Gas Operator | May 2024 |
| 20 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | May 2024 |
| 21 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 22 | Stevens & Tull, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 23 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 24 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 25 | Stream Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2024 |
| 26 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 27 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |