| 1 | Bearcat Energy LLC (Colorado) | Denver, CO 80202 | Oil & Gas Operator | May 2022 |
| 2 | Bearcat Petroleum Inc | | Oil Operator | Dec 1991 |
| 3 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Jul 2026 |
| 4 | Carbon Creek Energy LLC | Sheridan, WY 82801 | Oil & Gas Operator | Apr 2026 |
| 5 | Cedar Resources Corporation | Gillette, WY 82717 | Gas Operator | Dec 2010 |
| 6 | Cedar Ridge Operating Co LLC | Durango, CO 81303 | Gas Operator | Dec 2009 |
| 7 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 8 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 9 | Comet Energy Services LLC | Traverse City, MI 49686 | Oil & Gas Operator | Oct 2011 |
| 10 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 11 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 12 | Continental Industries LC | Casper, WY 82602 | Oil & Gas Operator | Feb 2008 |
| 13 | Continental Production Co LLC | Greenwood VIllage, CO 80155 | Oil & Gas Operator | Aug 2012 |
| 14 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 15 | DCD Inc | Gillette, WY 82716 | Oil & Gas Operator | Aug 2003 |
| 16 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2026 |
| 17 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jul 2026 |
| 18 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 19 | Elk Petroleum Inc | Casper, WY 82601 | Oil & Gas Operator | Aug 2014 |
| 20 | Enstar Petroleum Inc | | Oil & Gas Operator | Apr 1985 |
| 21 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 22 | EOG Y Resources Inc | Artesia, NM 88210 | Oil & Gas Operator | Feb 2019 |
| 23 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Jun 2026 |
| 24 | Federated Oil & Gas Properties | Traverse City, MI 49685 | Gas Operator | Mar 2014 |
| 25 | Ferguson Bob | Casper, WY 82605 | Oil Operator | May 2004 |
| 26 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Jul 2026 |
| 27 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 28 | High Plains Gas LLC | Gillette, WY 82717 | Gas Operator | Aug 2014 |
| 29 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Sep 2026 |
| 30 | Indian Creek Resources Inc | Loveland, CO 80538 | Oil & Gas Operator | Dec 2024 |
| 31 | Kennedy Oil | Gillette, WY 82716 | Oil & Gas Operator | Jul 2026 |
| 32 | Kissinger Petroleum Corp | | Oil & Gas Operator | Nov 1983 |
| 33 | Lance Oil & Gas Company Inc | Kirtland, NM 87417 | Oil & Gas Operator | Mar 2013 |
| 34 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 35 | Mountain Hawk Energy LLC | Athens, TX 75751 | Gas Operator | Jan 2015 |
| 36 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 37 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2026 |
| 38 | Northwest Energy LLC | Buffalo, WY 82834 | Gas Operator | Jan 2010 |
| 39 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 40 | Pecos Development Corporation | San Antonio, TX 78209 | Oil Operator | Aug 1988 |
| 41 | Pennaco Energy Incorporated | Gillette, WY 82718 | Oil & Gas Operator | Feb 2021 |
| 42 | Petro-Canada Resources (USA) Inc | Denver, CO 80202-472 | Oil & Gas Operator | Feb 2010 |
| 43 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 44 | Powder Battalion Holdings LLC | Sheridan, WY 82801 | Gas Operator | Dec 2023 |
| 45 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Sep 2026 |
| 46 | Redstone Gas Partners LLC | Denver, CO 80202 | Gas Operator | Mar 2001 |
| 47 | Reliance Resources Inc | Houston, TX 77007 | Gas Operator | Jun 2012 |
| 48 | Rocky Mountain Gas Inc | Sheridan, WY 82801 | Gas Operator | Nov 2009 |
| 49 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Sep 2026 |
| 50 | Snowy Owl LLC | Gillette, WY 82717 | Oil & Gas Operator | Jul 2026 |
| 51 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 52 | Steamboat Oil And Gas LLC | Gillette, WY 82717 | Oil Operator | Jun 2026 |
| 53 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2026 |
| 54 | Storm Cat Energy USA Operating Corp | Denver, CO 80202 | Gas Operator | Jun 2017 |
| 55 | Summit Gas Resources Inc | Sheridan, WY 82801 | Gas Operator | Dec 2023 |
| 56 | Sunshine Valley Petroleum | Casper, WY 82605 | Oil & Gas Operator | Jul 2026 |
| 57 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 58 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 59 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Jul 2026 |
| 60 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 61 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Jun 2026 |
| 62 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 63 | Wolverine Operations LLC | Buffalo, WY 82834 | Gas Operator | Oct 2008 |
| 64 | Wood River Oil & Refining Co | | Oil & Gas Operator | Dec 1998 |
| 65 | Wyoil Corp | Buffalo, WY 82834 | Oil Operator | Aug 2025 |