| 1 | BHP Billiton Petroleum (Fayetteville), LLC | | Gas Operator | Feb 2019 |
| 2 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Aug 2024 |
| 3 | Dennis & Eckhardt Management, LLC | Oklahoma City, OK 73118 | Gas Operator | Apr 2024 |
| 4 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 5 | Flywheel Energy Production, LLC | Oklahoma City, OK 73102 | Gas Operator | Jul 2024 |
| 6 | Hall Phoenix Energy, LLC | Frisco, TX 75034 | Oil & Gas Operator | Jun 2022 |
| 7 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 8 | McCutchin Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2024 |
| 9 | Merit Energy Company, LLC | Dallas, TX 75240 | Oil & Gas Operator | Aug 2024 |
| 10 | Pathfinder Exploration LLC | Norman, OK 73069-8516 | Gas Operator | Nov 2008 |
| 11 | Seeco | | Gas Operator | Jul 2016 |
| 12 | Seeco, Inc. | | Gas Operator | Sep 2015 |
| 13 | Seeco, LLC | | Gas Operator | May 2019 |
| 14 | Van Buren Energy Production, LLC | Oklahoma City, OK 73102 | Gas Operator | Jun 2024 |
| 15 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |