| 1 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 2 | Andrikopoulos Resources* A G | | Oil & Gas Operator | Jul 2015 |
| 3 | Antelope Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 4 | Bayless Producer LLC* Robert L | | Oil & Gas Operator | Aug 2024 |
| 5 | Beeman Oil & Gas LLC | | Oil & Gas Operator | Sep 2024 |
| 6 | Booco'S Contract Services Inc | | Oil & Gas Operator | Jan 2021 |
| 7 | CWC Oil & Gas, LLC | Abilene, TX 79608 | Oil & Gas Operator | Nov 2024 |
| 8 | Energy Investments Inc | | Oil & Gas Operator | Aug 2024 |
| 9 | Energy Operatng Company Inc | | Oil & Gas Operator | Jan 2000 |
| 10 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 11 | Entek GRB LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 12 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 13 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Nov 2024 |
| 14 | Germany Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2002 |
| 15 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 16 | HRM Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2015 |
| 17 | Infinity Oil & Gas Of Wyoming Inc | | Oil Operator | Dec 2007 |
| 18 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Nov 2024 |
| 19 | KLT Gas Inc | Woodlands, TX 77380 | Oil & Gas Operator | Sep 2004 |
| 20 | Luff Exploration Company | Denver, CO 80203 | Oil & Gas Operator | Sep 2024 |
| 21 | Lyster Oil Company Inc | | Oil & Gas Operator | Nov 2020 |
| 22 | Magpie Operating, Inc | | Oil & Gas Operator | Aug 2024 |
| 23 | Markus Production, Inc | | Oil & Gas Operator | Mar 2021 |
| 24 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 25 | New Frontier Energy Inc | | Gas Operator | Mar 2010 |
| 26 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 27 | Paladin Energy Partners LLC | | Oil & Gas Operator | Dec 2006 |
| 28 | Peakview Operating Company, LLC | | Oil & Gas Operator | Jul 2024 |
| 29 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 30 | Phoenix Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Jul 2022 |
| 31 | Pine Ridge Oil & Gas LLC | | Oil & Gas Operator | Jul 2015 |
| 32 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 33 | Shawnee Oil Development Co Inc | | Oil & Gas Operator | Sep 2024 |
| 34 | Stephens Energy Company LLC | | Oil & Gas Operator | Jun 2012 |
| 35 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 36 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Sep 2024 |
| 37 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Sep 2024 |
| 38 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 39 | Wyman* Louis M Dba Wyman Inc | | Oil & Gas Operator | Sep 2024 |