| 1 | A & T Oil Company | Midland, TX 79707 | Oil & Gas Operator | Sep 2008 |
| 2 | A & W Operating Inc | Drumright, OK 74030-5789 | Oil & Gas Operator | Mar 2015 |
| 3 | A J Oil And Gas | Oilton, OK 74052-0112 | Oil & Gas Operator | Jun 2012 |
| 4 | A R W Exploration Corp | Stillwater, OK 74076 | Oil & Gas Operator | May 2013 |
| 5 | ABC Oil Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2023 |
| 6 | Ablaze Drilling Company | Garland, TX 75044-2912 | Oil & Gas Operator | Aug 2013 |
| 7 | Ajb Oil LLC | Tulsa, OK 74114-5218 | Oil Operator | Jun 2025 |
| 8 | Allen Michael | Broken Arrow, OK 74014-2239 | Oil & Gas Operator | Apr 2025 |
| 9 | Allied Operating LLC | Bowling Green, KY 42101-3980 | Oil & Gas Operator | Sep 2015 |
| 10 | Allison Energy Holdings LLC | Nichols Hills, OK 73116-5113 | Oil Operator | Jun 2025 |
| 11 | Almac Engineering | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2007 |
| 12 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Oct 2025 |
| 13 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 14 | American Energy Recovery Inc | Oklahoma City, OK 73123-0549 | Oil & Gas Operator | Aug 2017 |
| 15 | Amvest Osage Inc | Skiatook, OK 74070-0970 | Oil & Gas Operator | Jun 2025 |
| 16 | Anderson T Maxwell | Tulsa, OK 74136-0653 | Oil & Gas Operator | Dec 2013 |
| 17 | Anstine & Musgrove Inc | Ponca City, OK 74602 | Oil & Gas Operator | Jun 2025 |
| 18 | Aog Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jun 2025 |
| 19 | Apache Energy Resources Corp | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 20 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Jun 2025 |
| 21 | Ashlock Thomas J | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2015 |
| 22 | Aspire Exploration LLC | Cleveland, OK 74020-0727 | Oil & Gas Operator | Feb 2015 |
| 23 | Associated Petro Invest Inc | Stillwater, OK 74076-2346 | Oil & Gas Operator | May 2013 |
| 24 | Atteberry Engineering | Edmond, OK 73013-6624 | Oil & Gas Operator | Mar 2008 |
| 25 | Aztec Exploration Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2013 |