| 1 | S & S Energy | Englewood, CO 80112 | Oil & Gas Operator | Mar 2015 |
| 2 | S & S Operating Company, Inc. | Winnie, TX 77665 | Oil & Gas Operator | Oct 2025 |
| 3 | S & V Operating | Zephyr, TX 76890 | Oil & Gas Operator | Oct 2025 |
| 4 | Sabco Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2011 |
| 5 | Sabinal Resources, Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Oct 2025 |
| 6 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 7 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Aug 2025 |
| 8 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 9 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 10 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 11 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 12 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 13 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 14 | Saratoga Energy Corporation | Sourlake, TX 77659 | Oil & Gas Operator | Dec 2004 |
| 15 | Saratoga Oil Company | Batson, TX 77519 | Oil & Gas Operator | Oct 2025 |
| 16 | Saratoga Production Company LLC | Sourlake, TX 77659 | Oil Operator | Oct 2025 |
| 17 | Sarita Energy Resources, LTD. | Houston, TX 77277 | Oil & Gas Operator | Oct 2025 |
| 18 | Sawtooth, Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2013 |
| 19 | Saxet Exploration Ent. Co., Inc. | Fulshear, TX 77441 | Oil Operator | Oct 2025 |
| 20 | Seabreeze Production Co | Hungerford, TX 77448 | Oil & Gas Operator | Oct 2025 |
| 21 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 22 | Seco Petroleum Corp | Houston, TX 77290 | Oil & Gas Operator | Jan 1997 |
| 23 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 24 | Setex Oil Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jan 2000 |
| 25 | Shale Oil Co., Inc. | Liberty, TX 77575 | Oil & Gas Operator | Oct 2025 |
| 26 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Oct 2025 |
| 27 | Sigmon Construction Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 28 | Silverbrook Operating II LLC | Barker, TX 77413 | Oil & Gas Operator | Oct 2025 |
| 29 | Silverbrook Operating, LLC | Barker, TX 77413 | Oil Operator | Oct 2025 |
| 30 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 31 | Sizemore, James | Hardin, TX 77561 | Oil & Gas Operator | Jun 2003 |
| 32 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 33 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 34 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 35 | Smith, L C Production | Jacksonville, TX 75766 | Oil Operator | Oct 2025 |
| 36 | Smith, L. C. | Jacksonville, TX 75766 | Oil & Gas Operator | Oct 2025 |
| 37 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 38 | Solatex Resources, LTD | Houston, TX 77257 | Oil & Gas Operator | Oct 2025 |
| 39 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 40 | Sonat Exploration Co. - Houston | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 41 | Sonora Petroleum Corp. | Austin, TX 78734 | Oil & Gas Operator | Oct 2025 |
| 42 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 43 | Southeastern Pipe Line Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2020 |
| 44 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 45 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 46 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 47 | Spicewood Operating Company, LLC | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 48 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 49 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 50 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 51 | SR Production Corp. | Liberty, TX 77575 | Oil & Gas Operator | Mar 2010 |
| 52 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 53 | Standard Resources Corp. | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 54 | Stardust Leasing, Inc. | Richmond, TX 77469 | Oil & Gas Operator | Jul 1999 |
| 55 | Stone Mountain Petroleum, LLC | Houston, TX 77008 | Oil & Gas Operator | Aug 2002 |
| 56 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 57 | Stratlynn, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 58 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 59 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Oct 2025 |
| 60 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 61 | Summit Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2016 |
| 62 | Sunburst, Inc. | Wheat Ridge, CO 80033 | Oil & Gas Operator | Jul 2025 |
| 63 | Susanna Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 64 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 65 | SWS | Humble, TX 77338 | Oil Operator | Oct 2025 |
| 66 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |