| 1 | A & P Oil & Gas | Leona, TX 75850 | Oil Operator | Jul 2025 |
| 2 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 3 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2025 |
| 4 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 5 | Alltex Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 6 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |
| 7 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 8 | Antelope Resources Inc | Billings, MT 59101 | Oil & Gas Operator | May 2017 |
| 9 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Jul 2025 |
| 10 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Jul 2025 |
| 11 | Arrow Exploration Company | Plano, TX 75075 | Oil & Gas Operator | Dec 2004 |
| 12 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Jul 2025 |
| 13 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 14 | B.W.O.C., Inc. | Plano, TX 75026 | Oil & Gas Operator | Jul 2025 |
| 15 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 16 | Barnes Oil & Gas LLC | Nashville, TN 37221 | Oil & Gas Operator | Jun 2017 |
| 17 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Jul 2025 |
| 18 | BC Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 19 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 20 | Bluestone Natural Resources, LLC | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2015 |
| 21 | Brighton Energy LLC | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 22 | Britnic Oil & Gas, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Jul 2025 |
| 23 | Brooks Petroleum Company | Tyler, TX 75703 | Oil & Gas Operator | Jul 2025 |
| 24 | Brown J K Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2003 |
| 25 | Buffalo Xxii Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jul 2025 |
| 26 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jul 2025 |
| 27 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 28 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 29 | BVX Operating, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Jul 2025 |
| 30 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 31 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Jul 2025 |
| 32 | Cameron Exploration, Inc. | Longview, TX 75604 | Oil & Gas Operator | Jul 2025 |
| 33 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 34 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jul 2025 |
| 35 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | Jul 2025 |
| 36 | CH4 Energy II LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2018 |
| 37 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 38 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 39 | Cheyenne Minerals, Inc. | Houston, TX 77030 | Oil & Gas Operator | Jun 2001 |
| 40 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Jul 2025 |
| 41 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 42 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 43 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 44 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 45 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 46 | Comet Oil & Gas, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Jul 2025 |
| 47 | Comet Production | Conroe, TX 77305 | Oil Operator | Jul 2025 |
| 48 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 49 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jul 2025 |
| 50 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 51 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 52 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 53 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 54 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Jul 2025 |
| 55 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 56 | CRD Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2021 |
| 57 | Crimson Exploration Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2006 |
| 58 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 59 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 60 | Cypress Partners, Inc. | Houston, TX 77068 | Oil & Gas Operator | May 1999 |
| 61 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 62 | Daniel Mineral Development, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2007 |
| 63 | Decker Operating Co., L.L.C. | Houston, TX 77008 | Oil & Gas Operator | Jul 2025 |
| 64 | Deguello Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 65 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 66 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 67 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 68 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 69 | Dominion Minerals Corporation | Houston, TX 77014 | Oil & Gas Operator | Nov 2009 |
| 70 | Douglas Petroleum Inc. | Spring, TX 77379 | Oil & Gas Operator | Nov 2010 |
| 71 | Dynamic Petroleum Res., Inc. | Houston, TX 77068 | Oil & Gas Operator | Jul 1994 |
| 72 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2025 |
| 73 | Edisto Resources Corp | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 74 | Edwards Petroleum Company | Houston, TX 77092 | Oil & Gas Operator | Aug 2003 |
| 75 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Jul 2025 |
| 76 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | May 2025 |
| 77 | Empire Texas Operating LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jul 2025 |
| 78 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 79 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 80 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 81 | Enercorp Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 1993 |
| 82 | Energy & Expl. PRTNRS Oper., LP | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2016 |
| 83 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Mar 2025 |
| 84 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2025 |
| 85 | Enerquest Operating, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |
| 86 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 87 | Engroup Resources, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 88 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 89 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 90 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 91 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 92 | Etx Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2022 |
| 93 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 94 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 95 | Fairways Exploration & Production, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2025 |
| 96 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 97 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Jul 2025 |
| 98 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 99 | Fidelity Explor. & Prod. Co. | Denver, CO 80202 | Oil & Gas Operator | Nov 2015 |
| 100 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |