| 1 | S & C Construction, Inc. | Whitefish, MT 59937 | Oil & Gas Operator | Jun 2025 |
| 2 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 3 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Jun 2025 |
| 4 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 5 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 6 | San Isidro Development Co, L. C. | Sandia, TX 78383 | Oil & Gas Operator | Jun 2025 |
| 7 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 8 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 9 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 10 | Santa Rosa Operating, LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Jun 2025 |
| 11 | Saxum Oil & Gas, LLC | Beeville, TX 78104 | Oil & Gas Operator | Jun 2025 |
| 12 | Scully Energy Corporation | Salado, TX 76571 | Oil & Gas Operator | Mar 2012 |
| 13 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Jun 2025 |
| 14 | Seguro Well Service, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Jun 2025 |
| 15 | Serco Operating LLC | Katy, TX 77450 | Oil Operator | Jun 2025 |
| 16 | Shale Hunter, LLC | Irving, TX 75039 | Oil & Gas Operator | Jan 2016 |
| 17 | Sharon Hunter Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2012 |
| 18 | Sharon Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2010 |
| 19 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 20 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Jun 2025 |
| 21 | Shoreham Oil & Gas Company, Inc. | Katy, TX 77492 | Oil & Gas Operator | Jun 2025 |
| 22 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 23 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2025 |
| 24 | Silverbrook Operating II LLC | Barker, TX 77413 | Oil & Gas Operator | Jun 2025 |
| 25 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 26 | Soco Gas Properties | Goliad, TX 77963 | Oil & Gas Operator | Jun 2025 |
| 27 | Sonat Exploration Co. - Houston | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 28 | South Texas Injection Company | Mineral, TX 78125 | Oil & Gas Operator | Dec 2016 |
| 29 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 30 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 31 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 32 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 33 | Southwest Land & Minerals, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Aug 2003 |
| 34 | Spiller Operating Co., Inc. | Round Rock, TX 78665 | Oil & Gas Operator | May 2015 |
| 35 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Jun 2025 |
| 36 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Jun 2025 |
| 37 | SRS Properties, LLC | Whitehouse, TX 75791 | Oil & Gas Operator | Jun 2025 |
| 38 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2025 |
| 39 | Stallion Oil Company | Lafayette, LA 70505 | Oil & Gas Operator | Jun 2004 |
| 40 | Staples, James W. | Tuleta, TX 78162 | Oil & Gas Operator | Sep 2014 |
| 41 | Staples, James W. Prod. Co. | Tuleta, TX 78162 | Oil & Gas Operator | Jun 2025 |
| 42 | Staples, Tommy Oil Co. | Pettus, TX 78146 | Oil & Gas Operator | Mar 2008 |
| 43 | Starco Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jun 2025 |
| 44 | Stark Petroleum | Tuleta, TX 78162 | Oil & Gas Operator | Jun 2025 |
| 45 | Statoil Texas Onshore Prop LLC | Austin, TX 78730 | Oil & Gas Operator | Dec 2018 |
| 46 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2025 |
| 47 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 48 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Jun 2025 |
| 49 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Jun 2025 |
| 50 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 51 | Suemaur Exploration, Inc. | Corpus Chrsti, TX 78470 | Oil & Gas Operator | Mar 2008 |
| 52 | Suemaur Operating LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2025 |
| 53 | Sun Exploration, Inc. | Alice, TX 78332 | Oil & Gas Operator | Jun 2025 |
| 54 | SV Energy Company, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2017 |
| 55 | Sydson Energy, Inc. | Houston, TX 77027 | Oil & Gas Operator | Jun 2025 |
| 56 | Syj Oil & Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2025 |