| 1 | S.O.C. Investors, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 2 | Safari Production Company, Inc. | McAllen, TX 78501 | Oil & Gas Operator | Oct 2025 |
| 3 | Salona, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 4 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 5 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Aug 2025 |
| 6 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 7 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 8 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 9 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 10 | Sandia Energy Corporation-NM | Holdenville, OK 74848 | Oil & Gas Operator | Aug 2003 |
| 11 | Saxum Oil & Gas, LLC | Beeville, TX 78104 | Oil & Gas Operator | Oct 2025 |
| 12 | Scorpion Operating, Inc. | Benavides, TX 78341 | Oil Operator | Oct 2025 |
| 13 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 14 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 15 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Oct 2025 |
| 16 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 17 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 18 | Sierra Resources, LLC | Houston, TX 77219 | Oil & Gas Operator | Aug 2021 |
| 19 | Smith Oil Company | Smackover, AR 71762 | Oil Operator | Jan 2025 |
| 20 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 21 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 22 | Sonora Petroleum Corp. | Austin, TX 78734 | Oil & Gas Operator | Oct 2025 |
| 23 | South Central Texas Oil & Gas Co | Houston, TX 77060 | Oil & Gas Operator | Oct 2025 |
| 24 | South Leeville, LLC | Houston, TX 77069 | Oil & Gas Operator | Oct 2022 |
| 25 | South Texas Limited Partnership | Houston, TX 77060 | Oil & Gas Operator | Feb 1994 |
| 26 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 27 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 28 | Southern Tejas Asset Group LLC | McAllen, TX 78501 | Oil & Gas Operator | Oct 2025 |
| 29 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 30 | Sparta Exploration LLC | Houston, TX 77279 | Oil & Gas Operator | Oct 2025 |
| 31 | Spiller Operating Co., Inc. | Round Rock, TX 78665 | Oil & Gas Operator | May 2015 |
| 32 | Spiller, Robert S. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1995 |
| 33 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 34 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 35 | St. Mary Energy Company | Houston, TX 77079 | Oil & Gas Operator | Aug 2008 |
| 36 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 37 | Stampede Energy Corp. | Canada, 00100 | Oil & Gas Operator | Mar 2000 |
| 38 | Star Of Texas Energy SRVS, Inc. | Austin, TX 78702 | Oil & Gas Operator | Oct 2025 |
| 39 | Starco Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 40 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2025 |
| 41 | Strata Operating, Inc. | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Oct 2025 |
| 42 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 43 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Oct 2025 |
| 44 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 45 | Suemaur Expl. & Prod., LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2024 |
| 46 | Suemaur Exploration, Inc. | Corpus Chrsti, TX 78470 | Oil & Gas Operator | Mar 2008 |
| 47 | Sure Flow Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Mar 2008 |
| 48 | Sure Flow Oil & Gas, Inc. | Victoria, TX 77902 | Oil & Gas Operator | Oct 2025 |
| 49 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 50 | Synergy Oil & Gas, L.P. | Houston, TX 77024 | Oil & Gas Operator | May 2012 |
| 51 | Synergy Production Company | Houston, TX 77024 | Oil & Gas Operator | Jan 1996 |