| 1 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 2 | Arp Production Company, LLC | Fort Worth, TX 76116 | Gas Operator | Nov 2023 |
| 3 | Barrett Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 4 | Cedar Ridge LLC | | Oil & Gas Operator | Oct 2006 |
| 5 | Chandler & Associates LLC | | Oil & Gas Operator | Jul 2001 |
| 6 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 7 | El Paso Energy Raton LLC | | Gas Operator | Sep 2008 |
| 8 | Energy Oil And Gas Inc | | Oil & Gas Operator | Dec 2010 |
| 9 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 10 | Evergreen Natural Resources LLC | | Gas Operator | Feb 2024 |
| 11 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 12 | KLT Gas Inc | Woodlands, TX 77380 | Oil & Gas Operator | Sep 2004 |
| 13 | Natural Resource Group Inc | | Oil & Gas Operator | Oct 2023 |
| 14 | Ogris Operating LLC | | Gas Operator | Jan 2024 |
| 15 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 16 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Dec 2023 |
| 17 | Presco Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2020 |
| 18 | Qep Uinta Basin Inc | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2007 |
| 19 | Red River Ranch Holdings LLC | | Gas Operator | Jan 2015 |
| 20 | Sonat Raton, L.L.C. | | Gas Operator | Sep 2005 |
| 21 | Stroud Oil Properties, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2013 |
| 22 | Timber Creek Operating LLC | Granbury, TX 76049 | Oil & Gas Operator | Apr 2024 |
| 23 | Vecta Oil & Gas LTD | Dallas, TX 75235 | Oil & Gas Operator | Jan 2024 |
| 24 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Apr 2024 |
| 25 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 26 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2024 |
| 27 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |