| 1 | A & B Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Apr 2015 |
| 2 | A & F Oil Company | | Oil & Gas Operator | Jan 2025 |
| 3 | A & F Production Company | | Oil Operator | Jan 2025 |
| 4 | A & M Oil Company | Cyril, OK 73029 | Oil & Gas Operator | May 2025 |
| 5 | A. M. A. Chiles | | Oil & Gas Operator | Jan 2025 |
| 6 | A. R. Wherrett Trustees | | Oil Operator | Jan 1987 |
| 7 | A. W. Sour, Jr. | | Oil Operator | Mar 2003 |
| 8 | A.J. Hodges Industries, Inc. | | Oil & Gas Operator | Sep 1987 |
| 9 | Abney Oil Company, Inc. | | Oil Operator | Mar 1981 |
| 10 | Ace Production | | Oil Operator | Jul 1993 |
| 11 | Ada Oil Exploration Corp | | Oil & Gas Operator | Jan 1986 |
| 12 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 13 | Al & D.L. Chiles | | Oil & Gas Operator | Jul 1991 |
| 14 | Al Chiles II | | Oil Operator | Jan 2025 |
| 15 | Aladdin Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 1999 |
| 16 | Alexander Brothers Oil | | Oil Operator | Jan 1999 |
| 17 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 18 | Allen Brothers | | Oil & Gas Operator | Dec 2024 |
| 19 | Allen Petroleum, Inc. | | Oil Operator | Jul 2010 |
| 20 | Alliance Exploration Corp. | | Oil & Gas Operator | Mar 1983 |
| 21 | Allied Exploration, Inc. | | Oil & Gas Operator | May 2021 |
| 22 | Allied Petroleum Inc. | Oklahoma City, OK 73116-1516 | Oil & Gas Operator | Jun 2014 |
| 23 | Alpha Petroleum | | Oil & Gas Operator | Jan 2025 |
| 24 | Alva J. Dixon | | Oil & Gas Operator | Aug 1991 |
| 25 | Alvin Wilson, Et Al | | Oil Operator | May 1991 |
| 26 | Amcole Energy Corporation | Dallas, TX 75231 | Oil & Gas Operator | Aug 2000 |
| 27 | American B. C. Resources | | Oil & Gas Operator | Oct 1985 |
| 28 | Amkay Petroleum Co., Inc. | | Oil Operator | Dec 1991 |
| 29 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 30 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 31 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 32 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 33 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 34 | Anthony Oil & Gas Co. | Shreveport, LA 71135 | Oil Operator | May 1993 |
| 35 | Anthony Oil Company | | Oil & Gas Operator | Oct 1987 |
| 36 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 37 | Apexway Corp. | | Oil Operator | Dec 2024 |
| 38 | April Rain Prod. Co., Inc. | | Oil & Gas Operator | Jul 1992 |
| 39 | Apv Caddo Pine LLC | | Oil & Gas Operator | Dec 2024 |
| 40 | Arapaho Petroleum Inc | Englewood, CO 80155 | Oil & Gas Operator | Nov 1998 |
| 41 | Arapahoe SPV LLC | | Oil & Gas Operator | Feb 2023 |
| 42 | Arcadia Refining Company | Tyler, TX 75701 | Oil & Gas Operator | Jan 1994 |
| 43 | Aries Oil & Gas Company, Inc. | | Oil Operator | Dec 1986 |
| 44 | Ark-La-Tex Anchor, Inc. | | Oil & Gas Operator | Mar 1999 |
| 45 | Ark-La-Tex Energy Partners, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2013 |
| 46 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 47 | Ark-La-Tex Gas Gathering Co | | Oil Operator | Mar 2000 |
| 48 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 49 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 50 | Arlen Corporation | Houston, TX 77077 | Oil & Gas Operator | Mar 2008 |
| 51 | Arlis Scogin | | Oil Operator | Jul 1985 |
| 52 | Arlis Scogin Et Al | | Oil & Gas Operator | Jan 1990 |
| 53 | Art Machin & Associates, Inc. | | Oil & Gas Operator | Jul 1997 |
| 54 | Arxana Oil & Gas Company, LLC | | Oil & Gas Operator | Jun 1998 |
| 55 | Ascot Oils, Inc. | | Oil & Gas Operator | Jul 1993 |
| 56 | Atlas Oil Exploration, Inc | | Oil & Gas Operator | Dec 1977 |
| 57 | Attaway Energy Group, Inc. | | Oil & Gas Operator | Aug 1995 |
| 58 | Austin E. Stewart | | Oil & Gas Operator | Feb 1979 |
| 59 | Austral Oil & Exploration, Inc | | Oil & Gas Operator | Jun 2004 |
| 60 | Axiom Tep, LLC | | Oil & Gas Operator | May 2015 |