| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | Sabco Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2011 |
| 3 | Sabco Operating Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2018 |
| 4 | Sabinal Resources, Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Sep 2025 |
| 5 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 6 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Sep 2025 |
| 7 | San Antonio Gas & Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2000 |
| 8 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 9 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Sep 2025 |
| 10 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 11 | Sandia Energy Corporation-NM | Holdenville, OK 74848 | Oil & Gas Operator | Aug 2003 |
| 12 | Sandia Operating Corp. | San Antonio, TX 78270 | Oil & Gas Operator | May 2010 |
| 13 | Saxet Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Mar 2004 |
| 14 | Saxet Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2025 |
| 15 | Scully Energy Corporation | Salado, TX 76571 | Oil & Gas Operator | Mar 2012 |
| 16 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 17 | Sea Eagle Ford, LLC | Denver, CO 80265 | Oil & Gas Operator | Jun 2022 |
| 18 | Seago Petroleum, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Sep 2025 |
| 19 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 20 | Sedco Resources Inc | Kerrville, TX 78029 | Oil & Gas Operator | Sep 2025 |
| 21 | Seismotech Energy, Incorporated | Plano, TX 75075 | Oil & Gas Operator | Aug 2003 |
| 22 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Sep 2025 |
| 23 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Sep 2025 |
| 24 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | Sep 2025 |
| 25 | Showdown Energy Corporation | Dallas, TX 75230 | Oil & Gas Operator | Aug 2003 |
| 26 | Silverbow Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 27 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Sep 2025 |
| 28 | SN Ef Maverick, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2023 |
| 29 | SN Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 30 | Solano Gas Processing, Inc. | Austin, TX 78759 | Oil & Gas Operator | Aug 1998 |
| 31 | South Oil, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 32 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 33 | Spri Oil & Gas, LLC | Houston, TX 77090 | Oil & Gas Operator | Mar 2020 |
| 34 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | Sep 2025 |
| 35 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 36 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | Sep 2025 |
| 37 | Stalking Horse Energy, Limited Liability Company | La Porte, TX 77571 | Oil & Gas Operator | Sep 2025 |
| 38 | Starrak Operating Company, Inc. | Midland, TX 79706 | Oil & Gas Operator | Jun 1999 |
| 39 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2025 |
| 40 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2025 |
| 41 | Stonegate Operators, Inc. | Addison, TX 75001 | Oil Operator | Sep 2025 |
| 42 | Stonegate Production Company,LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 43 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Sep 2025 |
| 44 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 45 | Suemaur Exploration, Inc. | Corpus Chrsti, TX 78470 | Oil & Gas Operator | Mar 2008 |
| 46 | Sutton Producing Corp. | San Antonio, TX 78270 | Oil & Gas Operator | Sep 2025 |
| 47 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 48 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |