| 1 | 1776 Energy Operators, LLC | Houston, TX 77070 | Oil & Gas Operator | Jul 2025 |
| 2 | 3 & 1 Operating Inc | | Oil & Gas Operator | Aug 2015 |
| 3 | 3-T Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 4 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 5 | 442 Operating La, LLC | | Oil & Gas Operator | Dec 2024 |
| 6 | 4H Oil Co. | | Oil Operator | Dec 1992 |
| 7 | A & B Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Apr 2015 |
| 8 | A & C Gas Productions, Inc. | | Gas Operator | Mar 2012 |
| 9 | A & F Oil Company | | Oil & Gas Operator | Jan 2025 |
| 10 | A & F Production Company | | Oil Operator | Jan 2025 |
| 11 | A & M Oil Company | Cyril, OK 73029 | Oil & Gas Operator | Apr 2025 |
| 12 | A A Company | | Gas Operator | Jun 2005 |
| 13 | A J & A, Inc. | | Gas Operator | Feb 2009 |
| 14 | A J Ferguson | | Oil Operator | Apr 1988 |
| 15 | A&K Production LLC Of Texas | | Oil & Gas Operator | Nov 2024 |
| 16 | A. J. Hodges, Ind. Inc Et Al | | Oil & Gas Operator | Jan 1979 |
| 17 | A. L. Coon | | Oil Operator | May 1979 |
| 18 | A. M. A. Chiles | | Oil & Gas Operator | Jan 2025 |
| 19 | A. Michael Hyde Oil & Gas Co. | | Oil & Gas Operator | Jan 1989 |
| 20 | A. R. Wherrett Trustees | | Oil Operator | Jan 1987 |
| 21 | A. T. Teague, Jr. | | Oil Operator | Aug 1993 |
| 22 | A. W. Sour, Jr. | | Oil Operator | Mar 2003 |
| 23 | A.J. Hodges Industries, Inc. | | Oil & Gas Operator | Sep 1987 |
| 24 | Abco Petroleum Corp. | | Oil & Gas Operator | Feb 1999 |
| 25 | Aberdeen American Petroleum Co., Inc. | | Oil & Gas Operator | Dec 1989 |
| 26 | Aberdeen Petroleum (USA) Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1994 |
| 27 | Abney Oil Company, Inc. | | Oil Operator | Mar 1981 |
| 28 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Jul 2025 |
| 29 | Acadian Gas Pipeline System | | Oil Operator | Jan 2025 |
| 30 | Acadian Land & Expl., Inc. | | Oil & Gas Operator | May 1992 |
| 31 | Acadiana Gas Systems, Inc. | | Oil & Gas Operator | Jan 1999 |
| 32 | Acadiana Reserves, Inc. | | Oil & Gas Operator | Oct 1984 |
| 33 | Acadienergy, Inc. | | Oil & Gas Operator | Jun 1988 |
| 34 | Ace Drilling Services, Inc. | | Oil & Gas Operator | Sep 1987 |
| 35 | Ace Production | | Oil Operator | Jul 1993 |
| 36 | Achilles Oil, LLC | | Oil & Gas Operator | May 2025 |
| 37 | Acierto Resources Company, LLC | Houston, TX 77070 | Oil & Gas Operator | Jul 2025 |
| 38 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2025 |
| 39 | Ada Oil Exploration Corp | | Oil & Gas Operator | Jan 1986 |
| 40 | Adam Petroleum Services, Inc. | | Oil Operator | Aug 1989 |
| 41 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Apr 2020 |
| 42 | Adco Producing Company | | Oil & Gas Operator | Mar 1989 |
| 43 | Addie, James & John Thornton | | Oil & Gas Operator | Dec 2024 |
| 44 | Addison Oil, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2013 |
| 45 | Addison Resources Inc. | | Oil & Gas Operator | Jul 1998 |
| 46 | Adobe Energy Company | | Oil & Gas Operator | Aug 2010 |
| 47 | Adobe Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 48 | Aegis Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Sep 1998 |
| 49 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Jul 2025 |
| 50 | Affiliated Holdings, Inc. | | Oil Operator | Dec 2010 |
| 51 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 52 | Agip Petroleum Co., Inc. | | Oil & Gas Operator | Jan 2003 |
| 53 | Ainsworth Prod Co. | | Oil Operator | Aug 1986 |
| 54 | Ainsworth Rig Service, LLC | | Oil Operator | Nov 2024 |
| 55 | Aix Energy Inc | | Oil & Gas Operator | Jul 2016 |
| 56 | Akin Beene Resources LLC | | Oil & Gas Operator | May 2016 |
| 57 | Al & D.L. Chiles | | Oil & Gas Operator | Jul 1991 |
| 58 | Al Chiles II | | Oil Operator | Jan 2025 |
| 59 | Aladdin Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 1999 |
| 60 | Alagood & Alagood | | Oil & Gas Operator | May 1981 |
| 61 | Alameda Oil Company | | Oil Operator | Mar 1998 |
| 62 | Alamo Petroleum Company | | Oil & Gas Operator | Jun 1985 |
| 63 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 64 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | Jul 2025 |
| 65 | Aldridge Operating Co., LLC | | Oil & Gas Operator | Aug 2019 |
| 66 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Jul 2025 |
| 67 | Alexander Brothers Oil | | Oil Operator | Jan 1999 |
| 68 | Alexandria Oil, Inc. | | Oil Operator | Dec 1991 |
| 69 | Alfred C. Glassell, Jr. | | Oil & Gas Operator | Apr 2007 |
| 70 | Alfred Lamson-James A. Crocker | | Oil & Gas Operator | Sep 1986 |
| 71 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 72 | Alice-Sidney Oil Co LTD PRTSHP | | Oil & Gas Operator | Mar 2020 |
| 73 | Alinet Corporation | | Oil & Gas Operator | Aug 2013 |
| 74 | Allen Brothers | | Oil & Gas Operator | Dec 2024 |
| 75 | Allen Petroleum Company | | Oil Operator | Apr 1996 |
| 76 | Allen Petroleum, Inc. | | Oil Operator | Jul 2010 |
| 77 | Alliance Exploration Corp. | | Oil & Gas Operator | Mar 1983 |
| 78 | Alliance Oil & Gas Co., Inc. | Corinth, TX 76205 | Oil & Gas Operator | Mar 2015 |
| 79 | Alliance Operating Corporation | | Oil & Gas Operator | Jan 1995 |
| 80 | Alliance Resources (USA), Inc. | | Oil & Gas Operator | Oct 2002 |
| 81 | Alliance Resources Corporation | Dallas, TX 75367 | Oil & Gas Operator | Nov 2024 |
| 82 | Allied Exploration, Inc. | | Oil & Gas Operator | May 2021 |
| 83 | Allied Petroleum Company | | Gas Operator | Dec 1992 |
| 84 | Allied Petroleum Inc. | Oklahoma City, OK 73116-1516 | Oil & Gas Operator | Jun 2014 |
| 85 | Allied-Gulf Energy, LLC | Lafayette, LA 70508 | Oil & Gas Operator | Jul 2025 |
| 86 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | Jul 2025 |
| 87 | Alltex Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 88 | Allwaste Oilfield Services Inc | | Oil Operator | May 1996 |
| 89 | Alpha Oil & Gas Inc. | | Oil & Gas Operator | Sep 1989 |
| 90 | Alpha Petroleum | | Oil & Gas Operator | Jan 2025 |
| 91 | Alpha Resources, Inc | | Oil & Gas Operator | Jun 2003 |
| 92 | Alpine Energy Corp. | | Oil & Gas Operator | Jun 2004 |
| 93 | Alpine Energy, Inc. | | Oil & Gas Operator | Dec 1999 |
| 94 | Alpine Expl. Companies, Inc. | | Oil & Gas Operator | Jan 2024 |
| 95 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 96 | Alpine Well Service Inc | | Oil & Gas Operator | Dec 2023 |
| 97 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Jul 2025 |
| 98 | Altair Corporation | | Oil & Gas Operator | Jul 1998 |
| 99 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 100 | Alva J. Dixon | | Oil & Gas Operator | Aug 1991 |