| 1 | 31 Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Dec 2024 |
| 3 | Aeon Energy Corp | | Oil & Gas Operator | Nov 2024 |
| 4 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 5 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 6 | Anschutz Oil Co. | | Oil & Gas Operator | Jul 1984 |
| 7 | Arrowhead Exploration Company | Olney, TX 76374 | Oil Operator | Dec 1995 |
| 8 | B & B Oilfield Services Inc | Windham, OH 44288 | Oil & Gas Operator | Dec 2023 |
| 9 | Ballantyne Oil | | Oil & Gas Operator | Jul 2010 |
| 10 | Ballantyne Oil, LLC | | Oil & Gas Operator | Mar 2023 |
| 11 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Oct 2024 |
| 12 | Barron Kidd-Great American Exploration | | Oil Operator | Dec 1968 |
| 13 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Oct 2024 |
| 14 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Nov 2024 |
| 15 | Calvert Drilling Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1992 |
| 16 | Calvert Exploration Co | | Oil & Gas Operator | Apr 1993 |
| 17 | Cardinal & Great Plains & Kaufman | | Oil Operator | Apr 1985 |
| 18 | Cardinal Drilling Co. | | Oil Operator | Jan 2007 |
| 19 | Cardinal Petroleum Co. | | Oil & Gas Operator | May 2004 |
| 20 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 21 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 22 | Chandler & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | May 1997 |
| 23 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Dec 2024 |
| 24 | Clinton Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Apr 1980 |
| 25 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2024 |
| 26 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 27 | Continental Oil Co. | Durango, CO 81301 | Oil & Gas Operator | Dec 1983 |
| 28 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2024 |
| 29 | Corinthian Exploration (USA) Corp | | Oil & Gas Operator | Apr 2016 |
| 30 | Crescent Point Energy Us Corp | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 31 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2024 |
| 32 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 33 | Double Aa Oil, L.L.C. | | Oil Operator | Aug 2023 |
| 34 | Eagle Operating Inc | Minot, ND 58701 | Oil & Gas Operator | Oct 2024 |
| 35 | Earl Schwartz Co. | | Oil & Gas Operator | Oct 1989 |
| 36 | Elk Oil Company | Overland Park, KS 66212 | Oil & Gas Operator | Sep 2007 |
| 37 | Empire North Dakota LLC | Tulsa, OK 74114 | Oil & Gas Operator | Oct 2024 |
| 38 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 39 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Oct 2024 |
| 40 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 41 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 42 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 43 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 44 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Dec 2024 |
| 45 | Fox Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2024 |
| 46 | Fulcrum Energy Operating LLC | | Oil & Gas Operator | Oct 2024 |
| 47 | G3 Operating, LLC | | Oil & Gas Operator | May 2013 |
| 48 | Georesources, Inc. | Williston, ND 58802-1505 | Oil & Gas Operator | Dec 2014 |
| 49 | Great American Exploration, Inc. | | Oil Operator | Feb 1979 |
| 50 | Great American Royalties, Inc. | | Oil Operator | Nov 2024 |
| 51 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 52 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 53 | I. J. Wilhite | | Oil Operator | Apr 2000 |
| 54 | I. J. Wilhite & Star Drilling, Inc. | | Oil Operator | Sep 1973 |
| 55 | J. M. Huber Corp. | Houston, TX 77079 | Oil & Gas Operator | Sep 2004 |
| 56 | James E. Schulte | | Oil Operator | Apr 2008 |
| 57 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 58 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jun 2024 |
| 59 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2024 |
| 60 | Legacy Oil & Gas ND, Inc. | | Oil & Gas Operator | Feb 2016 |
| 61 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 62 | Lubar Oil Co. | | Oil Operator | Nov 1983 |
| 63 | McAlester Fuel Co | Houston, TX 77042 | Oil & Gas Operator | Jan 2010 |
| 64 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 65 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Oct 2024 |
| 66 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 67 | Ovaco Energy Inc. | | Oil & Gas Operator | Nov 2009 |
| 68 | Patrick Petroleum Co. | Jackson, MI 49201 | Oil & Gas Operator | Nov 1993 |
| 69 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 70 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Oct 2024 |
| 71 | Resonance Exploration (North Dakota) LLC | | Oil & Gas Operator | Oct 2024 |
| 72 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2024 |
| 73 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Sep 2024 |
| 74 | Sagebrush Resources, LLC | | Oil & Gas Operator | Jan 2011 |
| 75 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 76 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 77 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 78 | Stekoll Oil & Gas, LTD. | | Oil Operator | Jun 1963 |
| 79 | Texas Crude Energy, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 2012 |
| 80 | Turtle Mountain Gas & Oil, Inc. | | Oil & Gas Operator | Oct 2006 |
| 81 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 82 | Vast Operations, LLC | | Oil Operator | Nov 2024 |
| 83 | Vickers & VIckers | | Oil Operator | Jul 2018 |
| 84 | Wacker Oil Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 85 | Ward-Williston Company | | Oil & Gas Operator | Apr 2014 |
| 86 | Ward-Williston Drilling Co. | | Oil & Gas Operator | Dec 1994 |
| 87 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 88 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2024 |
| 89 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 90 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jul 2024 |
| 91 | Williston Hunter ND, LLC | | Oil & Gas Operator | Mar 2014 |
| 92 | Williston Industrial Supply Corporation | Williston, ND 58801 | Oil & Gas Operator | Mar 2012 |
| 93 | Zargon Oil (ND) Inc. | | Oil & Gas Operator | Oct 2024 |