| 1 | Augustus Energy Partners LLC | Billings, MT 59102 | Oil & Gas Operator | Feb 2014 |
| 2 | Augustus Energy Resources LLC | | Oil & Gas Operator | Jun 2018 |
| 3 | B & B Oil Company LTD | | Gas Operator | Mar 2020 |
| 4 | Barfield Oil Corporation | | Oil & Gas Operator | Mar 2001 |
| 5 | Barrett Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 6 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Mar 2025 |
| 7 | Boulder Oil Company | | Oil & Gas Operator | Sep 2004 |
| 8 | Caerus Washco LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2019 |
| 9 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 10 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2023 |
| 11 | Colton Limited Liability Co | | Oil & Gas Operator | Sep 2023 |
| 12 | CWC Petro LLC | | Gas Operator | Dec 2024 |
| 13 | Diamond Operating, Inc. | | Oil & Gas Operator | Feb 2022 |
| 14 | Duke Gas Company LLC | | Gas Operator | Apr 2025 |
| 15 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2025 |
| 16 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 17 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Apr 2025 |
| 18 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 19 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2025 |
| 20 | Heartland Oil & Gas Company | | Oil & Gas Operator | Jun 2000 |
| 21 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 22 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 23 | Huber Corporation* J M | | Oil & Gas Operator | Feb 2008 |
| 24 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | May 2025 |
| 25 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 26 | McCartney Engineering LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Mar 2025 |
| 27 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 28 | Mountain Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2016 |
| 29 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 30 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 31 | Own Resources Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2025 |
| 32 | Par Pacific Holdings Inc | | Oil & Gas Operator | Apr 2015 |
| 33 | PDC Energy Inc | Denver, CO 80203 | Oil & Gas Operator | Mar 2025 |
| 34 | Petron Development Company | | Oil & Gas Operator | Oct 2020 |
| 35 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 36 | Platinum Gas Properties LLC | | Gas Operator | Apr 2025 |
| 37 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 38 | Prospective Investment & Trading Co., LTD., The | Tulsa, OK 74170-2320 | Oil & Gas Operator | Apr 2014 |
| 39 | Puckett-Warren Oil Co | | Oil & Gas Operator | Dec 2007 |
| 40 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 41 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 42 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 43 | Smith Energy Corp | | Oil & Gas Operator | Jan 2024 |
| 44 | Smith Energy LLC | | Oil & Gas Operator | Mar 2025 |
| 45 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jan 2025 |
| 46 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Nov 2024 |
| 47 | Valley Operating Inc | Denver, CO 80218-3633 | Oil & Gas Operator | Jan 2004 |
| 48 | Vista Operating Inc | | Oil & Gas Operator | Dec 2014 |
| 49 | Ward & Son* Alfred | | Oil & Gas Operator | Jun 2023 |
| 50 | Wbi Production | | Gas Operator | May 2002 |
| 51 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Mar 2025 |
| 52 | Wise* Wayne L | | Oil & Gas Operator | Dec 2023 |
| 53 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Mar 2025 |