| 1 | 31 Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2025 |
| 3 | Ansbro Petroleum Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2008 |
| 4 | Anschutz Oil Co. | | Oil & Gas Operator | Jul 1984 |
| 5 | Arsenal Energy USA Inc. | | Oil & Gas Operator | Aug 2016 |
| 6 | B & B Oilfield Services Inc | Windham, OH 44288 | Oil & Gas Operator | Dec 2024 |
| 7 | Ballantyne Oil | | Oil & Gas Operator | Jul 2010 |
| 8 | Ballantyne Oil, LLC | | Oil & Gas Operator | Mar 2023 |
| 9 | Barbara Fasken | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 10 | Behm Energy, Inc. | Minot, ND 58702 | Oil & Gas Operator | Jul 2025 |
| 11 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Aug 2025 |
| 12 | Camwest II LP | McKinney, TX 75070 | Oil & Gas Operator | Jul 2007 |
| 13 | Cardinal Petroleum Co. | | Oil & Gas Operator | May 2004 |
| 14 | Caroline Hunt Trust Estate | | Oil & Gas Operator | Mar 1987 |
| 15 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 16 | Chandler & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | May 1997 |
| 17 | Clyde G. Kissinger | | Oil Operator | Jun 1964 |
| 18 | Clyde W. Jones | | Oil Operator | Sep 2003 |
| 19 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 20 | Condor Petroleum, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 21 | D90 Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 22 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 23 | Double Aa Oil, L.L.C. | | Oil Operator | Aug 2023 |
| 24 | Eagle Operating Inc | Minot, ND 58701 | Oil & Gas Operator | Aug 2025 |
| 25 | Earl Schwartz Co. | | Oil & Gas Operator | Oct 1989 |
| 26 | Edward Mike Davis | Las Vegas, NV 89107 | Oil & Gas Operator | Feb 2003 |
| 27 | Edward Mike Davis, L.L.C. | | Oil & Gas Operator | Dec 2006 |
| 28 | Empire North Dakota LLC | Tulsa, OK 74114 | Oil & Gas Operator | Aug 2025 |
| 29 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 30 | Energy Operating Company Inc | Lakewood, CO 80235 | Oil & Gas Operator | Dec 2012 |
| 31 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 32 | Ensign Operating Co. | Denver, CO 80202 | Oil & Gas Operator | Jan 2004 |
| 33 | Flatirons Resources LLC | Westminster, CO 80021 | Oil & Gas Operator | Dec 2022 |
| 34 | Fram Operating LLC | | Oil & Gas Operator | Dec 2018 |
| 35 | G3 Operating, LLC | | Oil & Gas Operator | May 2013 |
| 36 | Genesis St Operating LLC | Kansas City, MO 64108 | Oil & Gas Operator | Oct 2025 |
| 37 | Georesources, Inc. | Williston, ND 58802-1505 | Oil & Gas Operator | Dec 2014 |
| 38 | Golden Eye Resources LLC | Greenwood VLG, CO 80121 | Oil Operator | Mar 2014 |
| 39 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 40 | Great American Exploration, Inc. | | Oil Operator | Feb 1979 |
| 41 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 42 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 43 | Gypsy Highview Gathering System, Inc. | Cut Bank, MT 59427-0250 | Oil & Gas Operator | Oct 2000 |
| 44 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 45 | High Plains Operating, LLC | | Oil Operator | Sep 2025 |
| 46 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 47 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 48 | Huntford Resources Corp | Englewood, CO 80112 | Oil & Gas Operator | Nov 2001 |
| 49 | I. J. Wilhite & Star Drilling, Inc. | | Oil Operator | Sep 1973 |
| 50 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 51 | Jettison, Inc. | | Oil & Gas Operator | Sep 2025 |
| 52 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 53 | Kissinger Petroleum Corp | | Oil & Gas Operator | Nov 1983 |
| 54 | Long Petroleum, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Jun 2020 |
| 55 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 56 | Moore & Associates | Denver, CO 80202 | Oil & Gas Operator | Dec 1993 |
| 57 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Aug 2025 |
| 58 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 59 | Nexen Oil And Gas U.S.A. Inc. | Calgary, AB T2P 5C1 | Oil & Gas Operator | Feb 2010 |
| 60 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Oct 2025 |
| 61 | Omimex International Corporation | Fort Worth, TX 76103-2300 | Oil & Gas Operator | Jun 2025 |
| 62 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 63 | Panamerican Operating Inc | Dallas, TX 75219 | Oil & Gas Operator | Oct 2025 |
| 64 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 65 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 66 | Phillip D. Armstrong | | Oil & Gas Operator | Sep 2018 |
| 67 | Primewest Petroleum Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jan 2009 |
| 68 | Sagebrush Resources, LLC | | Oil & Gas Operator | Jan 2011 |
| 69 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 70 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 71 | Sedalia Energy, LLC | | Oil & Gas Operator | Mar 2018 |
| 72 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 73 | Sohio Petroleum Co. | Casper, WY 82602 | Oil & Gas Operator | Apr 1986 |
| 74 | South Oak Production Company | | Oil & Gas Operator | Jun 2010 |
| 75 | Sparrow Oil & Gas LLC | | Oil & Gas Operator | Aug 2025 |
| 76 | St Oil Company | Denver, CO 80264-2101 | Oil & Gas Operator | Dec 2010 |
| 77 | Stephens Williston, LLC Dba Seg Williston, LLC | | Oil & Gas Operator | Aug 2025 |
| 78 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 79 | Taqa USA, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jul 2020 |
| 80 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2025 |
| 81 | Texas Crude Energy, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 2012 |
| 82 | Top Operating Company | | Oil & Gas Operator | Oct 2022 |
| 83 | Vaughn Petroleum, Inc. | Dallas, TX 75219 | Oil & Gas Operator | May 2004 |
| 84 | Ward-Williston Company | | Oil & Gas Operator | Apr 2014 |
| 85 | Wesco Operating, Inc. | Casper, WY 82602 | Oil & Gas Operator | Aug 2025 |
| 86 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 87 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 88 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 89 | Williston Hunter ND, LLC | | Oil & Gas Operator | Mar 2014 |
| 90 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 91 | Zargon Oil (ND) Inc. | | Oil & Gas Operator | Aug 2025 |