| 1 | Armstrong Operating, Inc. | Dickinson, ND 58602 | Oil & Gas Operator | Feb 2024 |
| 2 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 3 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 4 | C12 Energy: North Dakota LLC | | Oil Operator | Apr 2017 |
| 5 | Cardinal Petroleum Co. | | Oil & Gas Operator | May 2004 |
| 6 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2024 |
| 7 | Charger Resources, LLC | Hurst, TX 76054 | Oil & Gas Operator | Aug 2015 |
| 8 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2023 |
| 9 | Cline Production Company | Billings, MT 59104 | Oil & Gas Operator | Jan 2024 |
| 10 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 11 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 12 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 13 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 14 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Apr 2024 |
| 15 | Eagle Operating Inc | Minot, ND 58701 | Oil & Gas Operator | Feb 2024 |
| 16 | Emep Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 17 | Emerald Oil, Inc | | Oil & Gas Operator | Dec 2016 |
| 18 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 19 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jan 2024 |
| 20 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 21 | Farmers Union Central Exchange, Inc. | | Oil & Gas Operator | May 1983 |
| 22 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2024 |
| 23 | Five States Operating Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Feb 2024 |
| 24 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 25 | G3 Operating, LLC | | Oil & Gas Operator | May 2013 |
| 26 | Georesources, Inc. | Williston, ND 58802-1505 | Oil & Gas Operator | Dec 2014 |
| 27 | GMX Resources, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2014 |
| 28 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 29 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 30 | Hess Bakken Investments II, LLC | | Oil & Gas Operator | Feb 2024 |
| 31 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 32 | HNG Oil Company | | Oil & Gas Operator | Jun 1987 |
| 33 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 34 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2024 |
| 35 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 36 | KRB Enterprise, Inc. | | Oil Operator | Feb 2024 |
| 37 | Lamar Hunt | | Oil & Gas Operator | Oct 2003 |
| 38 | Leede Oil & Gas Inc. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Aug 2003 |
| 39 | Medora Minerals, LLC | | Oil & Gas Operator | Feb 2024 |
| 40 | Missouri Basin Well Service, Inc. | Belfield, ND 58622 | Oil & Gas Operator | Jan 2018 |
| 41 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 42 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Feb 2024 |
| 43 | New Millennium Resources, Inc. | | Oil & Gas Operator | Feb 2024 |
| 44 | P O & G Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 45 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 46 | Petro-Hunt Dakota, LLC | | Oil & Gas Operator | Feb 2024 |
| 47 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 48 | Petrosearch Operating Co, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 49 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Feb 2024 |
| 50 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 51 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 52 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2024 |
| 53 | South Heart Company | | Oil Operator | Aug 2010 |
| 54 | Thunderbird Resources LP | | Oil & Gas Operator | Apr 2019 |
| 55 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 56 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Feb 2024 |
| 57 | Upton Resources U.S.A. Inc. | | Oil & Gas Operator | Oct 2013 |
| 58 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 59 | Wesco Operating, Inc. | Casper, WY 82602 | Oil & Gas Operator | Feb 2024 |
| 60 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 61 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Apr 2024 |
| 62 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 63 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Feb 2024 |