| 1 | 1876 Resources LLC | Highlands Ranch, CO 80129 | Oil & Gas Operator | Apr 2026 |
| 2 | Balidor Oil & Gas LLC | Houston, TX 77070 | Oil & Gas Operator | Oct 2021 |
| 3 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Apr 2026 |
| 4 | Banks Operating Company | | Oil & Gas Operator | Jul 1989 |
| 5 | Barn Owls LLC | | Oil & Gas Operator | Mar 2026 |
| 6 | Barrett Patrick | | Oil & Gas Operator | Apr 1988 |
| 7 | Basin Oil & Gas Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2026 |
| 8 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 9 | Bass Petroleum Inc | Austin, TX 78716 | Oil & Gas Operator | Jun 2026 |
| 10 | Bearcat Energy LLC (Colorado) | Denver, CO 80202 | Oil & Gas Operator | May 2022 |
| 11 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 12 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | May 2026 |
| 13 | Big Chief Exploration | Palisades, CO 81526 | Oil & Gas Operator | Oct 1993 |
| 14 | Big Muddy Operating LLC | Casper, WY 82602 | Oil Operator | Apr 2026 |
| 15 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 16 | Black Bear Oil Corporation | Las Vegas, NV 89128 | Oil & Gas Operator | Apr 2026 |
| 17 | Black Diamond Energy Inc | Pittsburgh, PA 15237 | Gas Operator | May 2016 |
| 18 | Black Gold Services Inc | Casper, WY 82644 | Oil & Gas Operator | Dec 2025 |
| 19 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | Mar 2018 |
| 20 | Blackjack Oil, Inc. | Las Vegas, NV 89128 | Oil & Gas Operator | Nov 2019 |
| 21 | Blue Tip Energy Wyoming Inc | Houston, TX 77284 | Oil Operator | Jun 2016 |
| 22 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 23 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 24 | Bright Rock Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 25 | Bronco Oil & Gas Co | Casper, WY 82602 | Oil & Gas Operator | Oct 1987 |
| 26 | Brown Doug & Larita | Newcastle, WY 82701 | Oil & Gas Operator | Jun 2025 |
| 27 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 28 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 29 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2026 |
| 30 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 31 | Capitol Oil & Gas Corporation | Centennial, WY 82055 | Oil Operator | Feb 2006 |
| 32 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Apr 2026 |
| 33 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 34 | Cenergy Resources LLC | | Oil & Gas Operator | Nov 2025 |
| 35 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 36 | Central Wyoming Resources LTD | Glenrock, WY 82637 | Oil Operator | Jul 2021 |
| 37 | Century Production Inc | | Oil & Gas Operator | Dec 1986 |
| 38 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Apr 2026 |
| 39 | Chambers Jerry | Denver, CO 80237 | Oil & Gas Operator | Dec 1993 |
| 40 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2026 |
| 41 | Chaparral Resources Inc | Denver, CO 80293 | Oil & Gas Operator | Jan 1996 |
| 42 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 43 | Charger Resources, LLC | Hurst, TX 76054 | Oil & Gas Operator | Aug 2015 |
| 44 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 45 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2026 |
| 46 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2026 |
| 47 | Chipcore LLC | Casper, WY 82601 | Oil & Gas Operator | Apr 2026 |
| 48 | Chippewa Oil & Gas Inc | Douglas, WY 82633 | Oil & Gas Operator | Jan 1985 |
| 49 | Chriscor Oil & Gas | Plana, TX 75075 | Oil & Gas Operator | Jul 1987 |
| 50 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Jun 2026 |
| 51 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 52 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2026 |
| 53 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2023 |
| 54 | Colorado Oil & Gas Corporation | | Oil & Gas Operator | Sep 1984 |
| 55 | Combined Oil & Gas | Denver, CO 80202 | Oil & Gas Operator | Feb 1990 |
| 56 | Comet Energy Services LLC | Traverse City, MI 49686 | Oil & Gas Operator | Oct 2011 |
| 57 | Common Energy Inc | Douglas, WY 82633 | Oil & Gas Operator | Aug 1995 |
| 58 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 59 | Conquest Exploration | Houston, TX 77068 | Oil & Gas Operator | May 1991 |
| 60 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2026 |
| 61 | Continental Industries LC | Casper, WY 82602 | Oil & Gas Operator | Feb 2008 |
| 62 | Continental Production Co LLC | Greenwood VIllage, CO 80155 | Oil & Gas Operator | Aug 2012 |
| 63 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jun 2026 |
| 64 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 65 | Cook D L | Holliday, TX 76366 | Oil & Gas Operator | Dec 2008 |
| 66 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 67 | Corrida Oil Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 1990 |
| 68 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 69 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2026 |
| 70 | Creek Oil Company | Colorado Springs, CO 80906 | Oil & Gas Operator | Aug 2001 |
| 71 | D K Cook Heirs LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2011 |
| 72 | Dahill Murray P | Casper, WY 82601 | Oil & Gas Operator | Jun 2007 |
| 73 | Davis Exploration | | Oil Operator | Dec 2007 |
| 74 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 75 | DCD Inc | Gillette, WY 82716 | Oil & Gas Operator | Aug 2003 |
| 76 | Degaugh Well Service Inc | | Oil Operator | Jul 1989 |
| 77 | Dekalb Energy Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 1996 |
| 78 | Devon Energy Operating Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2013 |
| 79 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2026 |
| 80 | Dietrich Resources Corporation | | Oil & Gas Operator | Jun 2007 |
| 81 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Apr 2026 |
| 82 | Dol Resources Inc | Rowlett, TX 75088 | Oil & Gas Operator | Apr 2026 |
| 83 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 84 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Apr 2026 |
| 85 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 86 | Dyer J G | | Oil & Gas Operator | May 1985 |
| 87 | E & B Natural Resources Management | Guilderland Centek, NY 12085 | Oil & Gas Operator | Apr 2026 |
| 88 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 89 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2026 |
| 90 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 91 | Eberspecher Drilling Inc | Casper, WY 82601 | Oil & Gas Operator | Dec 2000 |
| 92 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 93 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2026 |
| 94 | Elephant Operating LLC | Dallas, TX 75204 | Oil & Gas Operator | Mar 2026 |
| 95 | Ellbogen John P LTD | Casper, WY 82602 | Oil & Gas Operator | Apr 2026 |
| 96 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 97 | Energas Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Jul 2025 |
| 98 | Energetics Inc | Englewood, CO 80155 | Oil & Gas Operator | Aug 1985 |
| 99 | Energy Resources LLC | Owensboro, KY 42301 | Oil Operator | Apr 2026 |
| 100 | Energy Search Company Inc | Aurora, CO 80011 | Oil & Gas Operator | Jun 2021 |