| 1 | Arkana Operating Company, Inc | Fort Worth, TX 76116-5707 | Oil & Gas Operator | Jul 2008 |
| 2 | Arrington Oil & Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 3 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 4 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 5 | BHP Billiton Petroleum (Fayetteville), LLC | | Gas Operator | Feb 2019 |
| 6 | Broman Oil & Gas LP | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2017 |
| 7 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2023 |
| 8 | D90 Energy, LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 9 | Flywheel Energy Production, LLC | Oklahoma City, OK 73102 | Gas Operator | Feb 2024 |
| 10 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2010 |
| 11 | KCS Resources, LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 12 | Merit Energy Company, LLC | Dallas, TX 75240 | Oil & Gas Operator | Jan 2024 |
| 13 | One Tec Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2011 |
| 14 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 15 | Seeco | | Gas Operator | Jul 2016 |
| 16 | Seeco, Inc. | | Gas Operator | Sep 2015 |
| 17 | Seeco, LLC | | Gas Operator | May 2019 |
| 18 | Storm Cat Energy (USA) Operating Corporation | Denver, CO 80202 | Gas Operator | Jun 2017 |
| 19 | Van Buren Energy Production, LLC | Oklahoma City, OK 73102 | Gas Operator | Feb 2024 |
| 20 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |