| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Feb 2024 |
| 2 | Aaron Oil Company | Shawnee, OK 74801-2321 | Oil Operator | Oct 2022 |
| 3 | ABC Oil Co. | Wichita Falls, TX 76307-1469 | Oil & Gas Operator | Oct 2023 |
| 4 | Abundance Energy LLC | | Oil & Gas Operator | Jul 2018 |
| 5 | Aei Corp. - Okla. | | Oil & Gas Operator | Sep 2014 |
| 6 | Aei Production Company | Edmond, OK 73083 | Oil & Gas Operator | Mar 2014 |
| 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 | May 2024 |
| 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 | Jan 2024 |
| 17 | American Petroleum & Mineral Co Inc | Seminole, OK 74818-1559 | Oil & Gas Operator | Aug 2019 |
| 18 | American Petroleum Corp | Addison, TX 75001 | Oil & Gas Operator | May 2024 |
| 19 | Americo Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2012 |
| 20 | An-Son Corporation | Oklahoma City, OK 73124-0060 | Oil & Gas Operator | Jan 2006 |
| 21 | Anadarko Basin Oil& Gas Lease Inc | Sayre, OK 73662 | Oil & Gas Operator | Jan 1997 |
| 22 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 23 | Anderson Floyd Melton Revocable Trust | Yukon, OK 73099 | Oil & Gas Operator | Jan 2024 |
| 24 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2024 |
| 25 | Anson Charles Dba Anson Oil | Seminole, OK 74868-9405 | Oil Operator | Jan 2024 |
| 26 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 27 | Anson J W | Seminole, OK 74818-1280 | Oil & Gas Operator | Oct 2020 |
| 28 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | May 2024 |
| 29 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Dec 2023 |
| 30 | Arapahoe Resources LLC | Oklahoma City, OK 73157-7107 | Oil & Gas Operator | Jan 2024 |
| 31 | Archibald Oil & Gas Operating Inc | Ada, OK 74821-0305 | Oil & Gas Operator | Feb 2024 |
| 32 | Aries Exploration Co Inc | Maud, OK 74854-0160 | Oil & Gas Operator | May 2013 |
| 33 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | May 2024 |
| 34 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2024 |
| 35 | Armor SWD Inc | | Oil Operator | May 2020 |
| 36 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 37 | Arrington David Oil & Gas Inc | Midland, TX 79702-2071 | Oil & Gas Operator | Dec 2014 |
| 38 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | May 2024 |
| 39 | Arrowhead Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Feb 2024 |
| 40 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | May 2024 |
| 41 | Associated Trans & Trading Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 1998 |
| 42 | Astro Energy Corporation | Edmond, OK 73083-3607 | Oil & Gas Operator | Sep 2014 |
| 43 | Atchley Resources Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2024 |
| 44 | Athabasca Energy Corporation | Simonton, TX 77476-0364 | Oil & Gas Operator | Dec 2017 |
| 45 | Atlanko Oil & Gas Inc | Tulsa, OK 74135-7846 | Oil & Gas Operator | Jan 2024 |
| 46 | Atlantic Richfield Company | Plano, TX 75094-1744 | Oil & Gas Operator | Dec 2016 |
| 47 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |
| 48 | Aw Hembree Co | Shawnee, OK 74802-1725 | Oil & Gas Operator | Jan 2024 |