| 1 | Aaron Oil Company Inc | Shawnee, OK 74801-2321 | Oil Operator | Oct 2022 |
| 2 | ABC Oil Company Inc | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2023 |
| 3 | Abundance Energy LLC | Bartlesville, OK 74005-1087 | Oil & Gas Operator | Jul 2018 |
| 4 | Aei Corporation-Oklahoma | Oklahoma City, OK 73101-1945 | Oil & Gas Operator | Sep 2014 |
| 5 | Aei Production Company | Edmond, OK 73083 | Oil & Gas Operator | Mar 2014 |
| 6 | Aikman Brothers | Midland, TX 79705 | Oil & Gas Operator | Dec 2000 |
| 7 | Akin Jr Verna M & Emsley F | Maud, OK 74854 | Oil & Gas Operator | Apr 2002 |
| 8 | Aleco Production Company | | Oil & Gas Operator | Nov 1997 |
| 9 | Allied Petroleum Inc | Oklahoma City, OK 73116-1516 | Oil & Gas Operator | Jun 2014 |
| 10 | Alpine Inc | Oklahoma City, OK 73134-2504 | Oil & Gas Operator | Feb 2024 |
| 11 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2025 |
| 12 | Amax Oil & Gas Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 13 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 14 | Amerex Corporation | Edmond, OK 73013-1044 | Oil & Gas Operator | Apr 2020 |
| 15 | American Capital Corporation | San Marcos, CA 92069 | Oil & Gas Operator | Sep 2014 |
| 16 | American Petroleum & Environmental Consultants Inc | Edmond, OK 73013-8801 | Oil & Gas Operator | Aug 2025 |
| 17 | American Petroleum & Mineral Co Inc | Seminole, OK 74868 | Oil & Gas Operator | Aug 2019 |
| 18 | Americo Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2012 |
| 19 | An-Son Corp | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 20 | Anadarko Basin Oil& Gas Lease Inc | Sayre, OK 73662 | Oil & Gas Operator | Jan 1997 |
| 21 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2025 |
| 22 | Anderson Floyd Melton Revocable Trust | Yukon, OK 73099 | Oil & Gas Operator | Oct 2024 |
| 23 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 24 | Anson Charles Dba Anson Oil | Seminole, OK 74868 | Oil Operator | Aug 2025 |
| 25 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 26 | Anson J W | Seminole, OK 74818-1280 | Oil & Gas Operator | Oct 2020 |
| 27 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 28 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Jul 2025 |
| 29 | Arapahoe Resources LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Sep 2025 |
| 30 | Archibald Oil & Gas Operating Inc | Ada, OK 74820 | Oil & Gas Operator | Sep 2025 |
| 31 | Aries Exploration Co Inc | Maud, OK 74854-0160 | Oil & Gas Operator | May 2013 |
| 32 | Aries Operating, LP | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 33 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 34 | Armor SWD Inc | Oklahoma City, OK 73112 | Oil Operator | May 2020 |
| 35 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 36 | Arrington David Oil & Gas Inc | Midland, TX 79702-2071 | Oil & Gas Operator | Dec 2014 |
| 37 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Dec 2025 |
| 38 | Arrowhead Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |
| 39 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | Dec 2025 |
| 40 | Astro Energy Corporation | Edmond, OK 73083-3607 | Oil & Gas Operator | Sep 2014 |
| 41 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Sep 2025 |
| 42 | Athabasca Energy Corporation | Simonton, TX 77476 | Oil & Gas Operator | Dec 2017 |
| 43 | Atlanko Oil & Gas Inc | Tulsa, OK 74135-7846 | Oil & Gas Operator | Aug 2025 |
| 44 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 45 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |
| 46 | Aw Hembree Co | Shawnee, OK 74802-1725 | Oil & Gas Operator | Aug 2025 |