| 1 | A & M Oilfield Sup Inc | | Oil & Gas Operator | Aug 1999 |
| 2 | A E W Inc | Okmulgee, OK 74447-0267 | Oil & Gas Operator | Mar 2015 |
| 3 | A-1 Oil Operators | Beggs, OK 74421-0329 | Oil & Gas Operator | Jan 2013 |
| 4 | Abarr Trust (The) | Oklahoma City, OK 73179 | Oil & Gas Operator | Nov 2025 |
| 5 | ABC Oil & Gas | Morris, OK 74445-0273 | Oil & Gas Operator | May 2025 |
| 6 | Adams Evertte | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 7 | Adkins Jim | Weleetka, OK 74880-8057 | Oil & Gas Operator | Apr 2020 |
| 8 | Admiral Resource Inc | Broken Arrow, OK 74012 | Oil & Gas Operator | Apr 2020 |
| 9 | Adrian Beachel | Henryetta, OK 74437 | Oil & Gas Operator | Oct 2025 |
| 10 | Advance Oil Corporation | Kiefer, OK 74041-4105 | Oil & Gas Operator | Nov 2025 |
| 11 | Ajb Oil LLC | Tulsa, OK 74114-5218 | Oil Operator | Oct 2025 |
| 12 | Alamo Resources Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 13 | Allen Wade | Okmulgee, OK 74447-9717 | Oil & Gas Operator | Dec 2021 |
| 14 | Allenergy Operating Co Inc | Coffeyville, KS 67337-6653 | Oil & Gas Operator | Mar 2015 |
| 15 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2025 |
| 16 | Amerex Corporation | Edmond, OK 73013-1044 | Oil & Gas Operator | Apr 2020 |
| 17 | American Energy LLC | Lake Zurich, IL 60047-0129 | Oil & Gas Operator | Nov 2014 |
| 18 | American Energy Operations Inc | Houston, TX 77002 | Oil & Gas Operator | Nov 1992 |
| 19 | American Petroleum & Environmental Consultants Inc | Edmond, OK 73013-8801 | Oil & Gas Operator | Oct 2025 |
| 20 | Americo Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2012 |
| 21 | Anderson, Carl T. | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2014 |
| 22 | Anjet Petroleum Company Inc | Gulfport, MS 39507-1301 | Oil & Gas Operator | Aug 2017 |
| 23 | Anson J W | Seminole, OK 74818-1280 | Oil & Gas Operator | Oct 2020 |
| 24 | Anson Robert L & Teresa M | Seminole, OK 74868 | Oil & Gas Operator | Oct 2025 |
| 25 | Aog Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Oct 2025 |
| 26 | Arcadia Refining Company | Tyler, TX 75701 | Oil & Gas Operator | Jan 1994 |
| 27 | Arica Energy Company | Beggs, OK 74421 | Oil Operator | Jun 1994 |
| 28 | Aries Exploration Co Inc | Maud, OK 74854-0160 | Oil & Gas Operator | May 2013 |
| 29 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Nov 2025 |
| 30 | Arrow Energy, Incorporated | Houston, TX 77008 | Oil & Gas Operator | Nov 2025 |
| 31 | Asher Tip Corporation | Fairfax, OK 74637-0308 | Oil & Gas Operator | Nov 2003 |
| 32 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 33 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2025 |
| 34 | Autumn Exploration LTD | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2015 |
| 35 | Avers Harvey G Energy Expl | | Oil & Gas Operator | May 2013 |
| 36 | Ayluma Operating Inc | Dewar, OK 74437 | Oil & Gas Operator | Oct 2024 |