| 1 | A J Acid Inc | Blackwell, OK 74631-0758 | Oil & Gas Operator | Dec 2012 |
| 2 | Aaron Well Service Inc | Enid, OK 73703 | Gas Operator | Jul 2025 |
| 3 | Abarr Trust (The) | Oklahoma City, OK 73179 | Oil & Gas Operator | Jul 2025 |
| 4 | Aberdeen Petroleum (USA) Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1994 |
| 5 | Ac Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 6 | Adams Res & Energy Co | Houston, TX 77001-0844 | Oil & Gas Operator | Mar 2015 |
| 7 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Apr 2020 |
| 8 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 9 | Agent Oil Corporation | Bison, OK 73720-0116 | Oil & Gas Operator | Mar 2005 |
| 10 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 11 | Alexander-Loop Oil Prop. Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Nov 1998 |
| 12 | Allied Petroleum Inc. | Oklahoma City, OK 73116-1516 | Oil & Gas Operator | Jun 2014 |
| 13 | Almack John And Glenda | Perry, OK 73077-8819 | Oil & Gas Operator | Apr 2016 |
| 14 | Almont Energy LLC | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Oct 2021 |
| 15 | Altex Energy Corporation | Oklahoma City, OK 73142-1920 | Oil & Gas Operator | Mar 2015 |
| 16 | Altex Resources, Inc. | Carney, OK 74832 | Oil & Gas Operator | Mar 2015 |
| 17 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 18 | Amerex Corporation | Edmond, OK 73013-1044 | Oil & Gas Operator | Apr 2020 |
| 19 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 20 | Amerril Energy LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 21 | Amerroyal Energy LLC | Shawnee, OK 74804-4163 | Oil & Gas Operator | Dec 2022 |
| 22 | Amplify Oklahoma Operating LLC | Houston, TX 77002-4800 | Oil & Gas Operator | Jun 2025 |
| 23 | Amsler Jerry & Denese | Enid, OK 73703-9300 | Oil & Gas Operator | Jul 2020 |
| 24 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 25 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 26 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 27 | Anderson Oil & Gas Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2013 |
| 28 | Anderson Robert C Estate | San Diego, CA 92109 | Oil & Gas Operator | Jul 1994 |
| 29 | Andrea Operating Company | Edmond, OK 73013-6627 | Oil & Gas Operator | May 2025 |
| 30 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 31 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 32 | Apache PHN North America, Inc. | | Oil & Gas Operator | Mar 2005 |
| 33 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 34 | Aqua-Oil Inc | Enid, OK 73703-6511 | Oil & Gas Operator | May 2019 |
| 35 | Arapaho Petroleum Inc | Englewood, CO 80155 | Oil & Gas Operator | Nov 1998 |
| 36 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 37 | Arp Oklahoma LLC | Fort Worth, TX 76102-7426 | Oil & Gas Operator | Feb 2020 |
| 38 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 39 | Arrowhead Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 40 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 41 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 42 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 43 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2025 |
| 44 | Athabasca Energy Corporation | Simonton, TX 77476 | Oil & Gas Operator | Dec 2017 |
| 45 | Athan Inc | Edmond, OK 73013-6628 | Oil & Gas Operator | Jul 2025 |
| 46 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 47 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Oct 2025 |