| 1 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 2 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2025 |
| 3 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 4 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 5 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 6 | Bow Valley Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 1996 |
| 7 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 8 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 9 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 10 | Chandler & Associated Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1999 |
| 11 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 12 | Cities Serv Oil & Gas Corp | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 1964 |
| 13 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2025 |
| 14 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 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 | Emery Resource Holdings LLC | Scottsdale, AZ 85260 | Gas Operator | Nov 2025 |
| 19 | Energetics Inc | Englewood, CO 80155 | Oil & Gas Operator | Aug 1985 |
| 20 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 21 | F L Energy | Holladay, UT 84117-4972 | Oil & Gas Operator | Feb 2007 |
| 22 | Fellows Energy LTD | Price, UT 84501-2016 | Gas Operator | Sep 2007 |
| 23 | Gas Producing Enterprises | Houston, TX 77046 | Oil & Gas Operator | Dec 1983 |
| 24 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 25 | Iacx Energy LLC | Dallas, TX 75244 | Gas Operator | Oct 2025 |
| 26 | Marion Energy Inc | Houston, TX 770082292 | Oil & Gas Operator | May 2015 |
| 27 | McAdams, J F | | Oil Operator | May 1971 |
| 28 | Megadon Enterprises, Inc | Salt Lake City, UT 84121 | Oil Operator | May 2020 |
| 29 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 30 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 31 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Oct 2025 |
| 32 | Mountain Fuel Supply Co | Salt Lake City, UT 84139 | Oil & Gas Operator | May 1984 |
| 33 | Mountain Resource Corporation | Salt Lake City, UT 84124 | Oil & Gas Operator | Dec 1988 |
| 34 | Northstar Gas, Inc. | Orem, UT 84097-6360 | Oil & Gas Operator | Nov 2025 |
| 35 | Pacific Natural Gas Explor | | Oil & Gas Operator | Dec 1974 |
| 36 | Pan American Petroleum Cor | | Oil & Gas Operator | Dec 1981 |
| 37 | Phelps Dodge Corp | | Gas Operator | Sep 1957 |
| 38 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 39 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 40 | Pride Ventures LLC | Moab, UT 84532 | Oil & Gas Operator | Aug 2025 |
| 41 | Questar Energy Company | Salt Lake C Ity, UT 84147 | Gas Operator | May 1991 |
| 42 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 43 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 44 | River Gas Corporation | Tuscaloosa, AL 35406-2233 | Gas Operator | Dec 2000 |
| 45 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 46 | Savoy Energy, LLC | Ephraim, UT 84627 | Gas Operator | Oct 2025 |
| 47 | Seeley Oil Company, LLC | Cortez, CO 81321 | Oil & Gas Operator | Sep 2025 |
| 48 | Shenandoah Energy Inc | Denver, CO 80265-1050 | Oil & Gas Operator | Dec 2014 |
| 49 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 50 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 51 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 52 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Sep 2025 |
| 53 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Dec 2025 |
| 54 | Texas Eastern Skyline Oil | Houston, TX 77252 | Oil & Gas Operator | Jan 1987 |
| 55 | Three States Natural Gas | | Oil & Gas Operator | Mar 1976 |
| 56 | Toledo Mining Co | Irving, TX 75061 | Oil Operator | Dec 1989 |
| 57 | Tom Brown Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 58 | Triangle Development Co | Mahtomedi, MN 55115 | Gas Operator | Feb 1982 |
| 59 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 60 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 61 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 62 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Oct 2025 |
| 63 | Vortt Exploration Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2019 |
| 64 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Sep 2025 |
| 65 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 66 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |