| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Feb 2024 |
| 2 | Abarr Trust (The) | Oklahoma City, OK 73123-0084 | Oil & Gas Operator | Feb 2024 |
| 3 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | May 2024 |
| 4 | Ac Oil & Gas LLC | | Oil & Gas Operator | Jan 2024 |
| 5 | Ackley Earl H & Glenora Trust | Cushing, OK 74023-5230 | Oil & Gas Operator | Mar 2015 |
| 6 | Adams Res & Energy Co | Houston, TX 77001-0844 | Oil & Gas Operator | Mar 2015 |
| 7 | Adobe Oil Company | | Oil & Gas Operator | Mar 2015 |
| 8 | Aei Production Company | Edmond, OK 73083 | Oil & Gas Operator | Mar 2014 |
| 9 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 10 | Aguila Operating Company LLC | | Oil & Gas Operator | Feb 2024 |
| 11 | Alameda Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 1994 |
| 12 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 13 | Alexander Oil Company | Loco, OK 73442-9409 | Oil & Gas Operator | Feb 2024 |
| 14 | Allied Petroleum Inc. | Oklahoma City, OK 73116-1516 | Oil & Gas Operator | Jun 2014 |
| 15 | Almont Energy LLC | | Oil & Gas Operator | Oct 2021 |
| 16 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 17 | Amcole Energy Corporation | Dallas, TX 75231 | Oil & Gas Operator | Aug 2000 |
| 18 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 19 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2023 |
| 20 | American Petroleum Corp | Addison, TX 75001 | Oil & Gas Operator | May 2024 |
| 21 | American Star Energy & Mineral Corp | Amarillo, TX 79102-2283 | Oil & Gas Operator | Jun 2015 |
| 22 | Americana Energy Inc | Byng, OK 74820-1527 | Oil & Gas Operator | Jan 2024 |
| 23 | Amoco Energy Trading Corp | Chicago, IL 60601 | Oil & Gas Operator | Apr 2021 |
| 24 | Amsler Jerry & Denese | Enid, OK 73703-9300 | Oil & Gas Operator | Jul 2020 |
| 25 | An-Son Corporation | Oklahoma City, OK 73124-0060 | Oil & Gas Operator | Jan 2006 |
| 26 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2024 |
| 27 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2024 |
| 28 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 29 | Ancova Energy Marketing LLC | | Oil & Gas Operator | Jan 2024 |
| 30 | Anderson Mary L | | Oil & Gas Operator | Nov 1998 |
| 31 | Anderson Oil & Gas Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2013 |
| 32 | Andrea Operating Company | Edmond, OK 73013-6627 | Oil & Gas Operator | Jan 2024 |
| 33 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 34 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | May 2024 |
| 35 | Apache PHN North America, Inc. | | Oil & Gas Operator | Mar 2005 |
| 36 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 37 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Dec 2023 |
| 38 | Arapaho Petroleum Inc | Englewood, CO 80155 | Oil & Gas Operator | Nov 1998 |
| 39 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Jan 2024 |
| 40 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | May 2024 |
| 41 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2024 |
| 42 | Arm Energy Management LLC | Houston, TX 77070 | Oil Operator | Mar 2015 |
| 43 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 44 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | May 2024 |
| 45 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 46 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 47 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 48 | Associated Trans & Trading Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 1998 |
| 49 | Atchley Resources Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2024 |
| 50 | Atlantic Richfield Company | Plano, TX 75094-1744 | Oil & Gas Operator | Dec 2016 |
| 51 | Atteberry Engineering | Edmond, OK 73013-6624 | Oil & Gas Operator | Mar 2008 |
| 52 | Auora Natural Gas & Assoc Prod | Dallas, TX 75205 | Oil & Gas Operator | Dec 2000 |
| 53 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 54 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | May 2024 |
| 55 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |