| 1 | Allen And Crouch | Casper, WY 82602 | Oil & Gas Operator | Mar 2020 |
| 2 | Alpha Petrovision Us Inc | Canada, 00100 | Oil & Gas Operator | May 2013 |
| 3 | American Energy Partners Inc | Boerne, TX 78006 | Oil & Gas Operator | Dec 2011 |
| 4 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 5 | Antelope Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 6 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 7 | Ashland Exploration | | Oil & Gas Operator | May 1979 |
| 8 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 9 | Banta And Haigh | Aurora, CO 80014 | Oil & Gas Operator | Feb 1998 |
| 10 | Basin Resources Corporation | Fair Oaks Ranch, TX 78015 | Oil Operator | May 2013 |
| 11 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Aug 2025 |
| 12 | BHP Petroleum (USA) Inc | | Oil & Gas Operator | Mar 1993 |
| 13 | Big Chief Exploration | Palisades, CO 81526 | Oil & Gas Operator | Oct 1993 |
| 14 | Boelens Well Service LLC | Thermopolis, WY 82443 | Oil Operator | Dec 1999 |
| 15 | Box H Resources | Cody, WY 82414 | Oil & Gas Operator | Dec 2007 |
| 16 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 17 | Brehm Investment Group Inc | | Oil Operator | Jul 1991 |
| 18 | Brehm Oil | MT. Vernon, IL 62864 | Oil Operator | Jan 1986 |
| 19 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 20 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 21 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Aug 2025 |
| 22 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 23 | Centennial Energy | Thermopolis, WY 82443 | Oil & Gas Operator | Jul 2025 |
| 24 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 25 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 26 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Aug 2025 |
| 27 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 28 | Continental Industries LC | Casper, WY 82602 | Oil & Gas Operator | Feb 2008 |
| 29 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 30 | Cork Petroleum Corporation | Thermopolis, WY 82443 | Oil & Gas Operator | Apr 2012 |
| 31 | Coronado Oil Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 32 | Creek Oil Company | Colorado Springs, CO 80906 | Oil & Gas Operator | Aug 2001 |
| 33 | Davey Corporation | Golden, CO 80401 | Oil & Gas Operator | Aug 2025 |
| 34 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 35 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Aug 2025 |
| 36 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 37 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 38 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 39 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 40 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 41 | Exeter Drilling Company | Denver, CO 80217 | Oil & Gas Operator | Sep 1997 |
| 42 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Sep 2025 |
| 43 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 44 | Flahive Oil & Gas LLC | Golden, CO 80401 | Oil Operator | Oct 1995 |
| 45 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 46 | Foreland Resources LLC | Lakewood, CO 80228 | Oil & Gas Operator | Jul 2025 |
| 47 | Gas Ventures LLC | Thermopolis, WY 82443 | Oil & Gas Operator | Oct 2020 |
| 48 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 49 | Girouard Richard L | | Oil Operator | May 1985 |
| 50 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 51 | Granite Creek Energy LLC | Cody, WY 82414 | Oil & Gas Operator | Aug 2025 |
| 52 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 53 | H & M Oil Producers | Littleton, CO 80160 | Oil & Gas Operator | Apr 2000 |
| 54 | H D Oil Company | Thermopolis, WY 82443 | Oil Operator | Aug 2025 |
| 55 | Hallador Petroleum LLP | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 56 | Hallwood Petroleum | Denver, CO 80237 | Oil & Gas Operator | Dec 1997 |
| 57 | Hawks Company | Casper, WY 82602 | Oil & Gas Operator | Apr 2007 |
| 58 | Hedges Spencer | Casper, WY 82604 | Oil Operator | Mar 2024 |
| 59 | Hot Springs Resources LTD | Casper, WY 82601 | Oil Operator | Dec 2014 |
| 60 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 61 | Husky Oil Company | Cody, WY 82414 | Oil & Gas Operator | Dec 1984 |
| 62 | I C Gas Amcana Inc | Tulsa, OK 74103-3713 | Oil & Gas Operator | Apr 1996 |
| 63 | Infinity Oil & Gas Of Wyoming | Rock Springs, WY 82902 | Oil & Gas Operator | Feb 2009 |
| 64 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Oct 2025 |
| 65 | Jellco LLC | Thermopolis, WY 82443 | Oil Operator | Aug 2025 |
| 66 | Joemar Wyoming Operating LLC | | Oil & Gas Operator | Jul 2025 |
| 67 | Katherman Vance E | Casper, WY 82601 | Oil Operator | Dec 2004 |
| 68 | KCS Mountain Resources Inc | Manderson, WY 82432 | Oil & Gas Operator | Nov 2006 |
| 69 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 70 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 71 | Llosu Corporation | Rawlins, WY 82301 | Oil & Gas Operator | Mar 2002 |
| 72 | Luff Exploration | Denver, CO 80203 | Oil & Gas Operator | Dec 2006 |
| 73 | M W Petroleum Company | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 74 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 75 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 76 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 77 | Morning Star Oil Company | Thermopolis, WY 82443 | Oil Operator | Feb 2025 |
| 78 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 79 | National Fuel Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Aug 2025 |
| 80 | Natural Gas Processing Company | Worland, WY 82401 | Oil & Gas Operator | Aug 2025 |
| 81 | New Era Petroleum Inc | Sheridan, WY 82801 | Oil Operator | Aug 2025 |
| 82 | Newton Steve Drilling | Worland, WY 82401 | Oil Operator | Apr 2001 |
| 83 | Oci LLC | Thermopolis, WY 82443 | Oil Operator | Jan 2024 |
| 84 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 85 | Ott Inc | Casper, WY 82602 | Oil Operator | Jul 2025 |
| 86 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 87 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Aug 2025 |
| 88 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 89 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Oct 2025 |
| 90 | Shenandoah Energy Inc | Denver, CO 80265-1050 | Oil & Gas Operator | Dec 2014 |
| 91 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 92 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 93 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 94 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 95 | Terex Energy Corporation | Casper, WY 82602 | Oil & Gas Operator | Aug 2019 |
| 96 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 97 | The Brinkerhoff Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 98 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Oct 2025 |
| 99 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 100 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |