| 1 | A H & L Operating Company Inc | Norman, OK 73070-4084 | Oil & Gas Operator | Apr 2015 |
| 2 | A R W Exploration Corp | Stillwater, OK 74076 | Oil & Gas Operator | May 2013 |
| 3 | Access Petroleum Corporation | | Oil & Gas Operator | Mar 2015 |
| 4 | Advance Oil Corporation | Kiefer, OK 74041-4105 | Oil & Gas Operator | Oct 2024 |
| 5 | Advent Oil & Operating Inc | Gulfport, MS 39506-7115 | Oil & Gas Operator | Nov 2014 |
| 6 | Aei Production Company | Edmond, OK 73083 | Oil & Gas Operator | Mar 2014 |
| 7 | Alameda Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 1994 |
| 8 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 9 | Almont Energy LLC | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Oct 2021 |
| 10 | Alpine Inc | Oklahoma City, OK 73134-2504 | Oil & Gas Operator | Feb 2024 |
| 11 | Altex Energy Corporation | Oklahoma City, OK 73142-1920 | Oil & Gas Operator | Mar 2015 |
| 12 | Altex Oil Corp | Breckenridge, CO 80424-1057 | Oil & Gas Operator | Dec 1999 |
| 13 | Altex Resources, Inc. | Carney, OK 74832 | Oil & Gas Operator | Mar 2015 |
| 14 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2024 |
| 15 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 16 | Amcole Energy Corporation | Dallas, TX 75231 | Oil & Gas Operator | Aug 2000 |
| 17 | American Domestic MGMT Inc | Tulsa, OK 74155 | Oil & Gas Operator | Apr 2015 |
| 18 | American Energy Recovery Inc | Oklahoma City, OK 73123-0549 | Oil & Gas Operator | Aug 2017 |
| 19 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2023 |
| 20 | Americo Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2012 |
| 21 | Amplify Oklahoma Operating LLC | Houston, TX 77002-4800 | Oil & Gas Operator | Sep 2024 |
| 22 | Aog Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Sep 2024 |
| 23 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Jul 2024 |
| 24 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Sep 2024 |
| 25 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 26 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Oct 2024 |
| 27 | Arrington David Oil & Gas Inc | Midland, TX 79702-2071 | Oil & Gas Operator | Dec 2014 |
| 28 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Dec 2024 |
| 29 | Arrowhead Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Oct 2024 |
| 30 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2024 |
| 31 | Athan Inc | Edmond, OK 73013-6628 | Oil & Gas Operator | Oct 2024 |
| 32 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 33 | Atteberry Engineering | Edmond, OK 73013-6624 | Oil & Gas Operator | Mar 2008 |
| 34 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2024 |
| 35 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |