| 1 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 2 | Altus Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Jul 1984 |
| 3 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 4 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 5 | Arch Oil And Gas Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1994 |
| 6 | Axem Resources Inc | Denver, CO 80202-4617 | Oil & Gas Operator | Jul 2013 |
| 7 | Banks Operating Company | | Oil & Gas Operator | Jul 1989 |
| 8 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 9 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Dec 2025 |
| 10 | Big Chief Exploration | Palisades, CO 81526 | Oil & Gas Operator | Oct 1993 |
| 11 | Big Wells Energy Corp | Katy, TX 77494 | Oil & Gas Operator | Sep 2019 |
| 12 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | Mar 2018 |
| 13 | Bower Properties LLC | Worland, WY 82401 | Oil & Gas Operator | Aug 2005 |
| 14 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 15 | Breitburn Operating LP | Keithville, LA 71047 | Oil & Gas Operator | Feb 2026 |
| 16 | Brent Exploration | | Oil & Gas Operator | Dec 1993 |
| 17 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Nov 2025 |
| 18 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Dec 2025 |
| 19 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 20 | Chambers Jerry | Denver, CO 80237 | Oil & Gas Operator | Dec 1993 |
| 21 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 22 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Feb 2026 |
| 23 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 24 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Feb 2026 |
| 25 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 26 | Coronado Oil Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 27 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 28 | Davey Corporation | Golden, CO 80401 | Oil & Gas Operator | Jan 2026 |
| 29 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 30 | Dietrich Resources Corporation | | Oil & Gas Operator | Jun 2007 |
| 31 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2025 |
| 32 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 33 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 34 | Family Tree Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Feb 2013 |
| 35 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 36 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Jan 2026 |
| 37 | Florida Gas Exploration Co | | Oil & Gas Operator | Feb 1985 |
| 38 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 39 | Fuel Exploration Inc | Denver, CO 80295 | Oil & Gas Operator | Jan 1992 |
| 40 | Gallagher Drilling Inc | Evansville, IN 47730 | Oil Operator | Dec 2020 |
| 41 | Gary-Williams Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2000 |
| 42 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 43 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 44 | Granite Creek Energy LLC | Cody, WY 82414 | Oil & Gas Operator | Dec 2025 |
| 45 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 46 | Hallador Petroleum LLP | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 47 | Hanson Operating Company Inc | Roswell, NM 88202 | Oil & Gas Operator | Aug 2025 |
| 48 | Herbaly Petroleum Corp | FT Worth, TX 76102 | Oil & Gas Operator | Feb 2002 |
| 49 | HMX Investments, Inc. | Katy, TX 77494 | Oil & Gas Operator | Nov 2025 |
| 50 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 51 | Intercontinental Petroleum | | Oil Operator | Oct 2012 |
| 52 | Internorth Inc | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |
| 53 | Intoil, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2002 |
| 54 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 55 | KCS Mountain Resources Inc | Manderson, WY 82432 | Oil & Gas Operator | Nov 2006 |
| 56 | Kentex Worland LLC | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 57 | Kentex Worland Operating Co LLC | | Oil & Gas Operator | Dec 2025 |
| 58 | Kiska Oil & Gas Inc | Tulsa, OK 74103 | Oil Operator | Oct 2012 |
| 59 | Koch Exploration Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 60 | Koch Production Company | Worland, WY 82401 | Oil & Gas Operator | Dec 2002 |
| 61 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 62 | L & R Drilling Company | Belle Fourche, SD 57717 | Oil & Gas Operator | Dec 1999 |
| 63 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Feb 2026 |
| 64 | M & C Oil Inc | Indianola, NE 68034 | Oil & Gas Operator | Nov 2013 |
| 65 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 66 | Markus Production | Littleton, CO 80123 | Oil & Gas Operator | Jan 2026 |
| 67 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 68 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 69 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 70 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 71 | Natural Gas Processing Company | Worland, WY 82401 | Oil & Gas Operator | Dec 2025 |
| 72 | Nielson & Associates, Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 73 | Nortex Gas & Oil Co | Tulsa, OK 74135 | Oil & Gas Operator | Sep 1993 |
| 74 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 75 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 76 | Pearce Leonard | Manderson, WY 82432 | Oil Operator | Dec 1999 |
| 77 | Pearce Mary | | Oil Operator | Dec 1999 |
| 78 | Pedry J J | | Oil Operator | Sep 1989 |
| 79 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 80 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 81 | Phoenix Production Company | Cody, WY 82414-3607 | Oil & Gas Operator | Oct 2023 |
| 82 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Sep 2025 |
| 83 | Polumbus Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1982 |
| 84 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Jan 2026 |
| 85 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 86 | Quinoco Petroleum Inc | | Oil & Gas Operator | Dec 1990 |
| 87 | Resolute Wyoming Inc | Denver, CO 80203 | Oil & Gas Operator | May 2018 |
| 88 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Feb 2026 |
| 89 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 90 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Feb 2026 |
| 91 | Samson Resources Company LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2021 |
| 92 | Seguro Oil & Gas Inc | | Oil Operator | Jul 1992 |
| 93 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 94 | Supron Energy Corp | | Oil & Gas Operator | Oct 1995 |
| 95 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 96 | Temagami Oil & Gas LTD | | Oil & Gas Operator | May 2007 |
| 97 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Nov 2025 |
| 98 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 99 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 100 | The Brinkerhoff Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |