| 1 | B & B Oil Company LTD | | Gas Operator | Mar 2020 |
| 2 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Oct 2025 |
| 3 | Caerus Washco LLC | Denver, CO 80202 | Gas Operator | Mar 2015 |
| 4 | CWC Petro LLC | | Gas Operator | Dec 2024 |
| 5 | Diamond Operating Inc | | Oil & Gas Operator | Aug 2021 |
| 6 | Duke Gas Company LLC | | Oil & Gas Operator | Sep 2025 |
| 7 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 8 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Nov 2025 |
| 9 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 10 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Dec 2025 |
| 11 | McCartney Engineering LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Oct 2025 |
| 12 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 13 | Mountain Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Apr 2013 |
| 14 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 15 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 16 | Own Resources Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2025 |
| 17 | Par Pacific Holdings Inc | | Oil & Gas Operator | Jun 2010 |
| 18 | PDC Energy Inc | Denver, CO 80203 | Oil & Gas Operator | Sep 2025 |
| 19 | Petron Development Company | | Oil & Gas Operator | Sep 2020 |
| 20 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 21 | Platinum Gas Properties LLC | | Gas Operator | Oct 2025 |
| 22 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 23 | Puckett-Warren Oil Co | | Oil Operator | Dec 2004 |
| 24 | Robertson* Dexter | | Gas Operator | Dec 2018 |
| 25 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 26 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 27 | Smith Energy LLC | | Oil & Gas Operator | Oct 2025 |
| 28 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 29 | Vista Operating, Inc. | | Oil & Gas Operator | Dec 2014 |
| 30 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Aug 2025 |
| 31 | Wise* Wayne L | | Oil & Gas Operator | Dec 2023 |