| 1 | S & V Operating | Zephyr, TX 76890 | Oil & Gas Operator | Dec 2025 |
| 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 | Safari Production Company, Inc. | McAllen, TX 78501 | Oil & Gas Operator | Dec 2025 |
| 5 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 6 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 7 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 8 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 9 | San Antonio Gas & Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2000 |
| 10 | San Isidro Development Co, L. C. | Sandia, TX 78383 | Oil & Gas Operator | Dec 2025 |
| 11 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 12 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 13 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 14 | Sandalwood Oil & Gas, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 15 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | Dec 2025 |
| 16 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 17 | Santos USA Corp. | Houston, TX 77042 | Oil & Gas Operator | Dec 2008 |
| 18 | Saratoga Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Jul 1994 |
| 19 | Sarita Oil & Gas | Boerne, TX 78006 | Oil & Gas Operator | Jul 2024 |
| 20 | Satex Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 21 | Saxet Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Mar 2004 |
| 22 | Saxet Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 23 | Saxum Oil & Gas, LLC | Beeville, TX 78104 | Oil & Gas Operator | Dec 2025 |
| 24 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 25 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 26 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Dec 2025 |
| 27 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 28 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 29 | Silver Hill Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 30 | Silverbow Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 31 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 32 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 33 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Dec 2025 |
| 34 | SN Ef Maverick, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2023 |
| 35 | SN Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 36 | Sonat Exploration Co. - Houston | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 37 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 38 | South Texas Energy Production | Devine, TX 78016 | Oil & Gas Operator | Dec 1996 |
| 39 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 40 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 41 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 42 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 43 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 44 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Dec 2025 |
| 45 | Spiller Operating Co., Inc. | Round Rock, TX 78665 | Oil & Gas Operator | May 2015 |
| 46 | Spiller, Robert S. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1995 |
| 47 | Spri Oil & Gas, LLC | Houston, TX 77090 | Oil & Gas Operator | Mar 2020 |
| 48 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 49 | Stampede Energy Corp. | Canada, 00100 | Oil & Gas Operator | Mar 2000 |
| 50 | Starr Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 51 | Starrak Operating Company, Inc. | Midland, TX 79706 | Oil & Gas Operator | Jun 1999 |
| 52 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |
| 53 | Stinger Oil & Gas Inc. | Sherman Oaks, CA 91403 | Oil & Gas Operator | Oct 2013 |
| 54 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 55 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 56 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2025 |
| 57 | Sunwest Oklahoma, Inc | Dallas, TX 75231 | Oil & Gas Operator | May 2023 |
| 58 | Sutton Producing Corp. | San Antonio, TX 78270 | Oil & Gas Operator | Dec 2025 |
| 59 | SV Energy Company, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2017 |
| 60 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 61 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |