| 1 | S. Parish Oil Company, Inc. | | Oil & Gas Operator | Dec 1997 |
| 2 | S2 Energy 1, LP | | Oil & Gas Operator | Nov 2012 |
| 3 | S2 Energy Operating LLC | | Oil & Gas Operator | May 2023 |
| 4 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 5 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 6 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 7 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 8 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 9 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2024 |
| 10 | Santa Fe Braun, Inc | Dallas, TX 75240-6620 | Oil & Gas Operator | Mar 1995 |
| 11 | Santa Fe Energy Operg Parts LP | | Oil & Gas Operator | Nov 1993 |
| 12 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 13 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 14 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 15 | Sante Fe Minerals | | Oil & Gas Operator | Dec 1987 |
| 16 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Nov 2024 |
| 17 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 18 | Seneca-Cashco | | Oil & Gas Operator | Sep 1986 |
| 19 | Shell Offshore Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 2008 |
| 20 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 21 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 22 | Shoreline Southeast LLC | | Oil & Gas Operator | Jun 2017 |
| 23 | Signal Oil And Gas Company | Colleyville, TX 76034 | Oil & Gas Operator | Nov 2024 |
| 24 | Signal Petroleum | | Oil & Gas Operator | Jul 1980 |
| 25 | Slam Resources, Inc. | | Oil & Gas Operator | Apr 1994 |
| 26 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Nov 2024 |
| 27 | Sola Oil Company, Inc. | | Oil & Gas Operator | Aug 1991 |
| 28 | Solatex Resources, LTD | Houston, TX 77257 | Oil & Gas Operator | Nov 2024 |
| 29 | Sooner Corporation | | Oil & Gas Operator | Oct 1990 |
| 30 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Nov 2024 |
| 31 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 32 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 33 | Southern Oil Of Louisiana LLC | Madisonville, LA 70447 | Oil & Gas Operator | Nov 2024 |
| 34 | Southwest Gas Producing Co Inc | | Oil & Gas Operator | Nov 1994 |
| 35 | Statoil Exploration (Us) Inc. | | Oil & Gas Operator | Jul 1997 |
| 36 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 37 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 38 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Nov 2024 |
| 39 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2024 |
| 40 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 41 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 42 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |