| 1 | Bayhorse Petroleum LLC | | Oil Operator | Dec 2016 |
| 2 | Benchmark Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 3 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Apr 2024 |
| 4 | Bonneville Fuels Corp | Denver, CO 80290 | Oil & Gas Operator | Jun 2002 |
| 5 | Carbon Energy Corporation (USA) | Denver, CO 80290 | Oil & Gas Operator | Jul 2004 |
| 6 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Feb 2024 |
| 7 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2024 |
| 8 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Dec 2023 |
| 9 | Colorado Interstate Gas Company LLC | Colorado Springs, CO 80944 | Oil & Gas Operator | Feb 2024 |
| 10 | Dover Atwood Corporation | Massillon, OH 44646 | Oil & Gas Operator | Dec 2023 |
| 11 | Energy Alliance Company Inc | | Oil & Gas Operator | Jan 2018 |
| 12 | Energy Operations Colorado LP | | Oil & Gas Operator | Nov 2009 |
| 13 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 14 | EP Energy Management LLC | | Oil & Gas Operator | Jun 2006 |
| 15 | Hayes Oil & Gas Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2005 |
| 16 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Jan 2024 |
| 17 | Jackson, Donald W. | Borger, TX 79008 | Oil & Gas Operator | Dec 2001 |
| 18 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 19 | Jones Energy, LTD. | Austin, TX 78746 | Oil & Gas Operator | Sep 2013 |
| 20 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2024 |
| 21 | Keener Oil & Gas Company | Tulsa, OK 74119-4416 | Oil & Gas Operator | Jan 2024 |
| 22 | Lorentz Oil & Gas LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2023 |
| 23 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 24 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Feb 2024 |
| 25 | Murfin Drilling Co., Inc. | Wichita, KS 67202 | Oil & Gas Operator | Feb 2024 |
| 26 | Norstar Petroleum Inc | Englewood, CO 80112 | Oil & Gas Operator | Dec 2023 |
| 27 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 28 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 29 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 30 | Phoenix Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Jul 2022 |
| 31 | Poncho Production Co | | Oil & Gas Operator | Jan 2022 |
| 32 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 33 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Dec 2023 |
| 34 | Samson Oil Company | | Oil & Gas Operator | Feb 2001 |
| 35 | Sandlin Oil Corp | Dacono, CO 80514 | Oil & Gas Operator | Feb 2024 |
| 36 | Sawtooth Energy Partners LLC | | Oil & Gas Operator | Nov 2005 |
| 37 | Schreider & Company, Inc | | Oil & Gas Operator | Jun 2023 |
| 38 | Sovereign Energy LLC | | Oil & Gas Operator | Sep 2011 |
| 39 | Sovereign Operating Company LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 40 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Feb 2024 |
| 41 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 42 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Apr 2024 |
| 43 | West Texas Operating Co LLC D/B/A Xtreme Energy Co | Victoria, TX 77902-2326 | Oil & Gas Operator | Jan 2024 |