| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Oct 2024 |
| 2 | Abercrombie, A. L., Inc | Wichita, KS 67202 | Oil & Gas Operator | Aug 2024 |
| 3 | Abng Inc | Chickasha, OK 73023-0926 | Oil & Gas Operator | Feb 2017 |
| 4 | Aker Oil & Gas Company | Tulsa, OK 74105-2216 | Oil & Gas Operator | Aug 2013 |
| 5 | Allied Petroleum Inc. | Oklahoma City, OK 73116-1516 | Oil & Gas Operator | Jun 2014 |
| 6 | Almont Energy LLC | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Oct 2021 |
| 7 | Ancova Energy Marketing LLC | Oklahoma City, OK 73103 | Oil & Gas Operator | Sep 2024 |
| 8 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 9 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 10 | Apache Energy Resources Corp | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 11 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Jul 2024 |
| 12 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Sep 2024 |
| 13 | Auora Natural Gas & Assoc Prod | Dallas, TX 75205 | Oil & Gas Operator | Dec 2000 |
| 14 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |
| 15 | Aven Gas & Oil Inc | Oklahoma City, OK 73113-0491 | Oil & Gas Operator | Nov 2021 |