| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Feb 2024 |
| 2 | Aaron Arnold B | Sulphur, OK 73086-6853 | Oil & Gas Operator | May 2004 |
| 3 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | May 2024 |
| 4 | Abundance Energy I LLC | | Gas Operator | Jan 2024 |
| 5 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 6 | Agave Energy, Inc | Stigler, OK 74462 | Oil & Gas Operator | Jan 2024 |
| 7 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 8 | American Petroleum Corp | Addison, TX 75001 | Oil & Gas Operator | May 2024 |
| 9 | Amoco Energy Trading Corp | Chicago, IL 60601 | Oil & Gas Operator | Apr 2021 |
| 10 | An-Son Corporation | Oklahoma City, OK 73124-0060 | Oil & Gas Operator | Jan 2006 |
| 11 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2024 |
| 12 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | Jan 2024 |
| 13 | Anderson Floyd Melton Revocable Trust | Yukon, OK 73099 | Oil & Gas Operator | Jan 2024 |
| 14 | Anjet Petroleum Company Inc | Gulfport, MS 39507-1301 | Oil & Gas Operator | Aug 2017 |
| 15 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 16 | Arco Pipe Line Company | Independence, KS 67301 | Oil & Gas Operator | Jun 1996 |
| 17 | Arkana Operating Company Inc | Fort Worth, TX 76116-5707 | Oil & Gas Operator | Jul 2008 |
| 18 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 19 | Arkoma Holding Corporation | Oklahoma City, OK 73102-5684 | Gas Operator | Jul 2007 |
| 20 | Arkoma Operations LLC | | Oil & Gas Operator | Feb 2024 |
| 21 | Arkoma Production Company | Shreveport, LA 71101 | Gas Operator | Apr 2020 |
| 22 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2024 |
| 23 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | May 2024 |
| 24 | Atlantic Richfield Company | Plano, TX 75094-1744 | Oil & Gas Operator | Dec 2016 |
| 25 | Atls Production Company LLC | | Gas Operator | Sep 2020 |
| 26 | Auora Natural Gas & Assoc Prod | Dallas, TX 75205 | Oil & Gas Operator | Dec 2000 |