| 1 | Abo Petroleum Corp | Artesia, NM 88210 | Oil & Gas Operator | Jul 1988 |
| 2 | Alco Oil & Gas | Lafayette, LA 70130 | Oil & Gas Operator | Dec 1970 |
| 3 | American Helium Operating, LLC | Katy, TX 77494 | Oil & Gas Operator | Sep 2025 |
| 4 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 5 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 6 | Apc Operating Partnership | Tulsa, OK 74136 | Oil & Gas Operator | Oct 1996 |
| 7 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 8 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 9 | Aztec Oil Co | | Oil & Gas Operator | Dec 1977 |
| 10 | Ballard & Associates Inc | Billings, MT 59102-5406 | Oil & Gas Operator | Feb 2000 |
| 11 | Ballard Petroleum LLC | Billings, MT 59102-5406 | Oil & Gas Operator | Apr 2014 |
| 12 | Basf Corporation | Houston, TX 77027 | Oil & Gas Operator | Nov 1992 |
| 13 | Bayless Robert L Producer | Denver, CO 80293 | Oil & Gas Operator | Sep 2003 |
| 14 | Belco Petroleum Corp | Grand Junction, CO | Oil & Gas Operator | Dec 1983 |
| 15 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 16 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 17 | Bog Inc (Bowers) | Grand Junction, CO 81502 | Oil & Gas Operator | Jan 1989 |
| 18 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 19 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 20 | Burr Oil & Gas | Farmington, NM 87499 | Oil & Gas Operator | Feb 2000 |
| 21 | Buttes Gas & Oil Co | | Oil & Gas Operator | Dec 2009 |
| 22 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 23 | C & K Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 1984 |
| 24 | California Oil Co | | Oil & Gas Operator | Aug 1965 |
| 25 | Capitol Operating Group, LLC | Lafayette, LA 70503-5334 | Oil & Gas Operator | Oct 2025 |
| 26 | Carter Oil Co | | Oil & Gas Operator | Dec 2013 |
| 27 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 28 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 29 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 30 | Chandler & Associated Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1999 |
| 31 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 32 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 33 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 34 | Cities Serv Oil & Gas Corp | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 1964 |
| 35 | Cochrane Resources Inc | Roosevelt, UT 84066 | Oil & Gas Operator | Oct 2025 |
| 36 | Colorado Pica Petro Corp | Cortez, CO 81321 | Oil & Gas Operator | Apr 2007 |
| 37 | Columbia Gas Development | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 38 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 39 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 40 | Continental Oil Co. | Durango, CO 81301 | Oil & Gas Operator | Dec 1983 |
| 41 | Cordillera Corporation | Denver, CO 80237 | Oil & Gas Operator | Feb 1996 |
| 42 | Cotton Petroleum Corp/Apc | Denver, CO 80203-4549 | Oil & Gas Operator | Nov 1990 |
| 43 | Crest Oil Corp | | Gas Operator | Dec 1983 |
| 44 | Cross Creek Corporation | Duncan, OK 73534 | Oil & Gas Operator | Mar 1999 |
| 45 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 46 | D J Simmons, Inc | Farmington, NM 87499 | Oil & Gas Operator | Apr 2020 |
| 47 | Daniels Petroleum Co | Denver, CO 80202 | Oil & Gas Operator | Mar 2003 |
| 48 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 49 | Delhi-Taylor Oil Corp | | Oil & Gas Operator | Dec 1974 |
| 50 | Delhi-Trading LLC | Durango, CO 81301 | Oil & Gas Operator | Oct 2025 |
| 51 | Diversified Energy LLC | Parker, CO 80138 | Oil & Gas Operator | Aug 2025 |
| 52 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Sep 2025 |
| 53 | Duncan Energy Companyuncan Energy Company | Denver, CO 80210 | Oil & Gas Operator | Jun 1995 |
| 54 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 55 | Duncan, Raymond T | Denver, CO 80210 | Oil & Gas Operator | Feb 1996 |
| 56 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 57 | Edwards Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 58 | Elk Operating Services, LLC | Denver, CO 80203 | Oil & Gas Operator | Oct 2025 |
| 59 | Elliott Inc | Roswell, NM 88201 | Oil & Gas Operator | Apr 1962 |
| 60 | Elm Ridge Exploration Company | Dallas, TX 75243-9362 | Oil & Gas Operator | Jan 2019 |
| 61 | Elm Ridge Resources Inc | Dallas, TX 75243 | Oil & Gas Operator | Nov 2005 |
| 62 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 63 | Energetics Inc | Englewood, CO 80155 | Oil & Gas Operator | Aug 1985 |
| 64 | Enstar Corporation | Houston, TX 77252 | Oil & Gas Operator | Apr 1988 |
| 65 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 66 | Erg Operating Company Inc | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 67 | Evergreen Energy, Inc | Houston, TX 77098 | Oil & Gas Operator | Dec 2025 |
| 68 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 69 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Aug 2025 |
| 70 | Fidelity E&P Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2016 |
| 71 | First Zone Production | Salt Lake City, UT 84102 | Oil & Gas Operator | Dec 1997 |
| 72 | Four Corners Energy, LLC | Gulf Breeze, FL 32563 | Oil & Gas Operator | Dec 2025 |
| 73 | General Minerals Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | Dec 2015 |
| 74 | General Petroleum Corp | Sand Springs, OK 74063-6646 | Oil & Gas Operator | Jul 2015 |
| 75 | Genesis St Operating LLC | Kansas City, MO 64108 | Oil & Gas Operator | Dec 2025 |
| 76 | Giant Explor & Prod Co | Farmington, NM 87499 | Oil & Gas Operator | Aug 1996 |
| 77 | Global Natural Res Corp | Houston, TX 77210 | Oil & Gas Operator | Dec 1994 |
| 78 | Grynberg, Jack J. | Denver, CO 80237 | Oil & Gas Operator | Jun 2021 |
| 79 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 80 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 81 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 82 | Harken Southwest Corp | Dallas, TX 752612007 | Oil & Gas Operator | Feb 2001 |
| 83 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | Jun 2025 |
| 84 | Helbing & Podpechan | Clarence, OK 74018 | Oil & Gas Operator | May 1983 |
| 85 | Hershey Oil | Pasadena, CA 91103 | Oil & Gas Operator | Dec 1988 |
| 86 | Holcomb Oil & Gas Inc | Farmington, NM 87401 | Oil & Gas Operator | Sep 2025 |
| 87 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Dec 2025 |
| 88 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 89 | Howell Oil Company | Hutchinson, KS 67504 | Oil & Gas Operator | Jun 2025 |
| 90 | HPC Incorporated | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 91 | Humble Oil & Refining Co. | Houston, TX 77252 | Oil & Gas Operator | Jan 2000 |
| 92 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 93 | J & L Oil Company | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 94 | Journey Operating LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 95 | Kenneth D Luff | | Oil & Gas Operator | Dec 1983 |
| 96 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 97 | Lodestone Operating, Inc. | Portland, TX 78374 | Oil & Gas Operator | Dec 2025 |
| 98 | Mar/Reg Oil Company | Reno, NV 89511 | Oil & Gas Operator | Sep 2025 |
| 99 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 100 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Oct 2025 |