| 1 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 2 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 3 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 4 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 5 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 6 | Berry Petroleum Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2014 |
| 7 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Feb 2024 |
| 8 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 9 | Blue Tip Castlegate, Inc | Erie, KS 66733 | Gas Operator | Jun 2016 |
| 10 | Burr Oil & Gas | Farmington, NM 87499 | Oil & Gas Operator | Feb 2000 |
| 11 | Cities Serv Oil & Gas Corp | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 1964 |
| 12 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Apr 2024 |
| 13 | Cockrell Oil Corporation | Houston, TX 77002-7348 | Oil & Gas Operator | Feb 2001 |
| 14 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 15 | Cordillera Corporation | Denver, CO 80237 | Oil & Gas Operator | Feb 1996 |
| 16 | Delhi-Taylor Oil Corp | | Oil & Gas Operator | Dec 1974 |
| 17 | Edward Mike Davis | Las Vegas, NV 89107 | Oil & Gas Operator | Feb 2003 |
| 18 | El Paso Natural Gas Company | El Paso, TX 79978 | Oil & Gas Operator | Apr 2013 |
| 19 | Emery Resource Holdings LLC | Scottsdale, AZ 85260 | Gas Operator | Mar 2024 |
| 20 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 21 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 22 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 23 | Fellows Energy LTD | Price, UT 84501-2016 | Gas Operator | Sep 2007 |
| 24 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 25 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 26 | Gordon Creek, LLC | Calgary, AB T2P 3P8 | Gas Operator | May 2019 |
| 27 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | Dec 2023 |
| 28 | Hyland Oil Corporation | | Oil & Gas Operator | Apr 1990 |
| 29 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Apr 2024 |
| 30 | J. M. Huber Corp. | Houston, TX 77079 | Oil & Gas Operator | Sep 2004 |
| 31 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 32 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 33 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 34 | Liberty Pioneer Energy Source, Inc | Provo, UT 84604 | Oil & Gas Operator | Oct 2021 |
| 35 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 36 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Feb 2024 |
| 37 | Marion Energy Inc | Houston, TX 770082292 | Oil & Gas Operator | May 2015 |
| 38 | McAdams, J F | | Oil Operator | May 1971 |
| 39 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 40 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 41 | Mountain Fuel Supply Co | Salt Lake City, UT 84139 | Oil & Gas Operator | May 1984 |
| 42 | Natural Gas Corp Of Ca | Vernal, UT 84078 | Oil & Gas Operator | Jun 1989 |
| 43 | Newfield Production Company | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jul 2022 |
| 44 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 45 | Oso Oil & Gas Properties LLC | Price, UT 84501 | Gas Operator | Jun 2016 |
| 46 | Pacific Natural Gas Explor | | Oil & Gas Operator | Dec 1974 |
| 47 | Pacific Trans Supply | Vernal, UT 84078 | Oil & Gas Operator | Jul 1987 |
| 48 | Pease, Willard H | Grand Junction, CO 81502 | Gas Operator | May 1995 |
| 49 | Petro-Canada Resources (USA) Inc | Denver, CO 80202-472 | Oil & Gas Operator | Feb 2010 |
| 50 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 51 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 52 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Dec 2023 |
| 53 | Price River Energy, LLC | Houston, TX 77024 | Gas Operator | Feb 2024 |
| 54 | Pride Ventures LLC | Moab, UT 84532 | Oil & Gas Operator | Jan 2024 |
| 55 | Reserve Oil & Gas | | Oil & Gas Operator | Feb 1980 |
| 56 | River Gas Corporation | Tuscaloosa, AL 35406-2233 | Gas Operator | Dec 2000 |
| 57 | River Gas Of Utah Inc | Northport, AL 35476 | Gas Operator | Feb 1995 |
| 58 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 59 | Seeley Oil Company, LLC | Cortez, CO 81321 | Oil & Gas Operator | Feb 2024 |
| 60 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 61 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 62 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 63 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 64 | Sun Oil Company | Arlington, TX 76006 | Oil & Gas Operator | Dec 2021 |
| 65 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 66 | Swepi/Western Division | Houston, TX 77210 | Oil & Gas Operator | Aug 1984 |
| 67 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Nov 2023 |
| 68 | Teton Energy Co Inc | Denver, CO 80239 | Oil Operator | Dec 1983 |
| 69 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Apr 2024 |
| 70 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 71 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 72 | Texas Eastern Skyline Oil | Houston, TX 77252 | Oil & Gas Operator | Jan 1987 |
| 73 | Three States Natural Gas | | Oil & Gas Operator | Mar 1976 |
| 74 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 75 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2024 |
| 76 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Feb 2024 |
| 77 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Apr 2024 |
| 78 | Wasatch Oil & Gas Corp | Farmington, UT 84025-0699 | Oil & Gas Operator | Mar 2002 |
| 79 | Western Resources And Clean Energy, LLC | Manti, UT 84642 | Oil & Gas Operator | Jan 2024 |
| 80 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 81 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Feb 2024 |
| 82 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 83 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 84 | Williams Production RMT Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2010 |
| 85 | Winds Exploration And Production, LLC | Houston, TX 77032 | Gas Operator | Jan 2024 |