| 1 | American International Energy Corp | | Oil & Gas Operator | Oct 2003 |
| 2 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 3 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 4 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 5 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Nov 2024 |
| 6 | Bayhorse Petroleum LLC | | Oil Operator | Dec 2016 |
| 7 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 8 | Berry Energy Inc*Walter | | Oil & Gas Operator | Feb 2017 |
| 9 | Blue Creek Inc | | Oil & Gas Operator | Dec 2002 |
| 10 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 11 | Brito Oil Co., Inc | Wichita, KS 67201 | Oil & Gas Operator | Dec 2009 |
| 12 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Sep 2024 |
| 13 | Chemco Inc | | Oil & Gas Operator | Sep 2023 |
| 14 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 15 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Jul 2024 |
| 16 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Nov 2024 |
| 17 | Delek Energy Systems Us Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 18 | Dominion Oklahoma Texas Exploration & Production | Houston, TX 77060 | Oil & Gas Operator | Dec 2006 |
| 19 | Dunne Equities Operating Inc | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 20 | Ellora LLC | Boulder, CO 80308 | Oil & Gas Operator | Feb 2010 |
| 21 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 22 | Energy Operatng Company Inc | | Oil & Gas Operator | Jan 2000 |
| 23 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 24 | Gibson J W | | Oil & Gas Operator | Sep 1999 |
| 25 | Grand Mesa Operating Company | Wichita, KS 67206 | Oil & Gas Operator | Sep 2024 |
| 26 | Grynberg* Jack Dba Grynberg Petroleum Co | | Oil & Gas Operator | Jan 2023 |
| 27 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 28 | Halde Oil Inc | | Oil & Gas Operator | Sep 2024 |
| 29 | Horseshoe Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 30 | Huber Corporation* J M | | Oil & Gas Operator | Feb 2008 |
| 31 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Sep 2024 |
| 32 | Kennec Trustee* Frank | | Gas Operator | Apr 2008 |
| 33 | Kuenzler & Flora Reserve Company | | Oil Operator | Aug 2024 |
| 34 | Kykon Oil & Gas, Inc. | Billings, MT 59103 | Oil & Gas Operator | Feb 2009 |
| 35 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Nov 2024 |
| 36 | Monument Gas Marketing Inc | | Oil & Gas Operator | Aug 2024 |
| 37 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Aug 2024 |
| 38 | Murfin Drilling Co., Inc. | Wichita, KS 67202 | Oil & Gas Operator | Sep 2024 |
| 39 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 40 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2024 |
| 41 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jul 2024 |
| 42 | Pronghorn Operating LLC | | Oil Operator | Jan 2023 |
| 43 | Renegade Oil & Gas Company LLC | | Oil & Gas Operator | Sep 2024 |
| 44 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Aug 2024 |
| 45 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 46 | Samson Oil Company | | Oil & Gas Operator | Feb 2001 |
| 47 | Sawtooth Energy Partners LLC | | Oil & Gas Operator | Nov 2005 |
| 48 | Smith Oil Properties Inc | | Oil & Gas Operator | Nov 2022 |
| 49 | Strachan Exploration Inc | Englewood, CO 80112 | Oil & Gas Operator | Aug 2024 |
| 50 | Thomas L Spring LLC | | Oil & Gas Operator | Aug 2024 |
| 51 | Thorofare Resources, Inc | | Oil & Gas Operator | May 2011 |
| 52 | Timberline Energy Inc | Franklin, PA 16323-0269 | Oil & Gas Operator | Dec 2023 |
| 53 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Nov 2024 |
| 54 | Trousil & Associates, Inc. | Steamboat SPG, CO 80477 | Oil & Gas Operator | Dec 2006 |
| 55 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 56 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Aug 2024 |
| 57 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 58 | Wiepking-Fullerton Energy LLC | | Oil & Gas Operator | Aug 2024 |