| 1 | Baldes Henry | Riverton, WY 82501 | Oil Operator | Dec 1998 |
| 2 | Banta And Haigh | Aurora, CO 80014 | Oil & Gas Operator | Feb 1998 |
| 3 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Jun 2026 |
| 4 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Jun 2026 |
| 5 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 6 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 7 | Black Bear Oil Corporation | Las Vegas, NV 89128 | Oil & Gas Operator | May 2026 |
| 8 | Black Coal Resources Company | Fort Washakie, WY 82514 | Oil & Gas Operator | Dec 1991 |
| 9 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | Mar 2018 |
| 10 | Bluebonnet Energy Corporation | Englewood, CO 80112 | Oil & Gas Operator | Sep 2015 |
| 11 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 12 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 13 | Brower Oil & Gas Inc | Jenks, OK 74037 | Oil & Gas Operator | Nov 2022 |
| 14 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 15 | Buffalo Resources LLC | Woodward, OK 73801 | Oil & Gas Operator | Aug 2025 |
| 16 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 17 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 18 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2026 |
| 19 | Camwest Limited Partnership | Denver, CO 80202 | Oil & Gas Operator | Apr 2004 |
| 20 | Capitan Operating LLC | Reno, NV 89502 | Oil & Gas Operator | Jan 2013 |
| 21 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 22 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 23 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 24 | Chaparral Resources Inc | Denver, CO 80293 | Oil & Gas Operator | Jan 1996 |
| 25 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 26 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Aug 2026 |
| 27 | Chipcore LLC | Casper, WY 82601 | Oil & Gas Operator | Jun 2026 |
| 28 | Chippewa Oil & Gas Inc | Douglas, WY 82633 | Oil & Gas Operator | Jan 1985 |
| 29 | Chriscor Oil & Gas | Plana, TX 75075 | Oil & Gas Operator | Jul 1987 |
| 30 | Christensen C G | | Oil Operator | Sep 1990 |
| 31 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 32 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Aug 2026 |
| 33 | Clark Oil & Gas Inc | | Oil & Gas Operator | Dec 1990 |
| 34 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 35 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2026 |
| 36 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2023 |
| 37 | Columbine Exploration Corp | Englewood, CO 80111 | Oil & Gas Operator | Aug 1998 |
| 38 | Comanche Oil & Gas Corp | Salt Lake City, UT 84107-3075 | Oil & Gas Operator | May 2005 |
| 39 | Common Energy Inc | Douglas, WY 82633 | Oil & Gas Operator | Aug 1995 |
| 40 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 41 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jun 2026 |
| 42 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Aug 2026 |
| 43 | Crowheart Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | May 2026 |
| 44 | Crown Central Petroleum Corp | Richmond, TX 77469 | Oil & Gas Operator | Dec 1999 |
| 45 | D & D Contract Pumping Inc | Casper, WY 82604 | Oil Operator | Jun 2026 |
| 46 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 47 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 48 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2026 |
| 49 | Denbury Onshore, LLC | Spring, TX 77389 | Oil & Gas Operator | Aug 2026 |
| 50 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2026 |
| 51 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 52 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 53 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2026 |
| 54 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Aug 2026 |
| 55 | Elk Energy Corporation | Denver, CO 80218 | Oil & Gas Operator | Mar 2008 |
| 56 | Elk Petroleum Inc | Casper, WY 82601 | Oil & Gas Operator | Aug 2014 |
| 57 | Energetics Inc | Englewood, CO 80155 | Oil & Gas Operator | Aug 1985 |
| 58 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 59 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2026 |
| 60 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 2026 |
| 61 | EOG Y Resources Inc | Artesia, NM 88210 | Oil & Gas Operator | Feb 2019 |
| 62 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 63 | Escalera Resources Co | Casper, WY 82602 | Oil & Gas Operator | May 2018 |
| 64 | Everest Oil & Gas LLC | Santa Barbara, CA 93101 | Oil Operator | Jun 2026 |
| 65 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2026 |
| 66 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Aug 2026 |
| 67 | Family Tree Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Feb 2013 |
| 68 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Aug 2026 |
| 69 | First Energy Corporation | | Oil & Gas Operator | Jun 1993 |
| 70 | First Energy Properties | Houston, TX 77060 | Oil & Gas Operator | Dec 1986 |
| 71 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 72 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 73 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 74 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 75 | Hallador Petroleum LLP | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 76 | Hawks Industries Inc | Casper, WY 82601 | Oil & Gas Operator | Jun 1993 |
| 77 | Herbaly Petroleum Corp | FT Worth, TX 76102 | Oil & Gas Operator | Feb 2002 |
| 78 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Aug 2026 |
| 79 | Hondo Oil & Gas | Houston, TX 77042 | Oil & Gas Operator | Oct 1995 |
| 80 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 81 | HR Energy LLC | Shelby, MT 59474 | Oil & Gas Operator | Apr 2026 |
| 82 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2002 |
| 83 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Aug 2026 |
| 84 | Hudson Group LLC | Casper, WY 82601 | Oil & Gas Operator | Jul 2025 |
| 85 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 86 | Husky Oil Company | Cody, WY 82414 | Oil & Gas Operator | Dec 1984 |
| 87 | K N Energy Inc | Lakewood, CO 80228 | Oil & Gas Operator | Nov 2000 |
| 88 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 89 | Kaneb Oil & Gas | | Oil & Gas Operator | Oct 1987 |
| 90 | KCS Mountain Resources Inc | Manderson, WY 82432 | Oil & Gas Operator | Nov 2006 |
| 91 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 92 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2026 |
| 93 | Kirkwood W C | Casper, WY 82602 | Oil & Gas Operator | May 2005 |
| 94 | Kobar Corporation | Riverton, WY 82501 | Gas Operator | Dec 1996 |
| 95 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Apr 2003 |
| 96 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 97 | L B Industries Inc | Englewood, CO 80112 | Oil & Gas Operator | Jun 2003 |
| 98 | Laguna Petroleum Company | Casper, WY 82601 | Oil & Gas Operator | Dec 1982 |
| 99 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Aug 2026 |
| 100 | Llosu Corporation | Rawlins, WY 82301 | Oil & Gas Operator | Mar 2002 |