| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Dec 2024 |
| 2 | Altex Oil Company | Breckenridge, CO 80424 | Oil & Gas Operator | Dec 2005 |
| 3 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 4 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 5 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2024 |
| 6 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 7 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 8 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 9 | Ant Hills Production | Lusk, WY 82225 | Oil & Gas Operator | Aug 2024 |
| 10 | Antelope Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 11 | Antler Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | Sep 2024 |
| 12 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 13 | Ashland Exploration | | Oil & Gas Operator | May 1979 |
| 14 | Axem Resources Inc | Denver, CO 80202-4617 | Oil & Gas Operator | Jul 2013 |
| 15 | Barrel Springs Development Corp | Denver, CO 80202 | Oil & Gas Operator | Oct 1986 |
| 16 | Benson-Montin-Greer DRLG Corp | Farmington, NM 87402 | Oil & Gas Operator | Oct 2024 |
| 17 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2024 |
| 18 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Nov 2024 |
| 19 | BHB Oil Partners LLC | Powell, WY 82435 | Oil Operator | Sep 2024 |
| 20 | BHP Petroleum (USA) Inc | | Oil & Gas Operator | Mar 1993 |
| 21 | Bitterroot Energy Partners LLC | | Oil & Gas Operator | Oct 2024 |
| 22 | Bluebonnet Energy Corporation | Englewood, CO 80112 | Oil & Gas Operator | Sep 2015 |
| 23 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 24 | Braden-Deem Inc | Wichita, KS 67226 | Oil & Gas Operator | Aug 2024 |
| 25 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 26 | Brower Oil & Gas Inc | Jenks, OK 74037 | Oil & Gas Operator | Nov 2022 |
| 27 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 28 | Bullock Gladys C Trust | | Oil & Gas Operator | Dec 1999 |
| 29 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 30 | Byron Oil Industries Inc | Ballwin, MO 63011 | Oil & Gas Operator | Apr 2019 |
| 31 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 32 | Carbon Creek Energy LLC | Sheridan, WY 82801 | Oil & Gas Operator | Sep 2024 |
| 33 | CDX Gas, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2009 |
| 34 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 35 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 36 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Oct 2024 |
| 37 | Chambers Jerry | Denver, CO 80237 | Oil & Gas Operator | Dec 1993 |
| 38 | Chancellor & Dolezal | | Gas Operator | Apr 1992 |
| 39 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2024 |
| 40 | Charger Resources, LLC | Hurst, TX 76054 | Oil & Gas Operator | Aug 2015 |
| 41 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 42 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 43 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 44 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2023 |
| 45 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 46 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 47 | Continental Industries LC | Casper, WY 82602 | Oil & Gas Operator | Feb 2008 |
| 48 | Continental Production Co LLC | Greenwood VIllage, CO 80155 | Oil & Gas Operator | Aug 2012 |
| 49 | Cordillera Corporation | Denver, CO 80237 | Oil & Gas Operator | Feb 1996 |
| 50 | Cornerstone Natural Resources LLC | Denver, CO 80234 | Oil & Gas Operator | Oct 2024 |
| 51 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 52 | Cox Edwin L & Berry R | | Oil & Gas Operator | Oct 1987 |
| 53 | Crowheart Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | Sep 2024 |
| 54 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 55 | Davis Oil Company | Pawhuska, OK 74056 | Oil & Gas Operator | Jun 2018 |
| 56 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 57 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 58 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 59 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | Oct 2024 |
| 60 | Dolezal George Jr | Littleton, CO 80163 | Oil & Gas Operator | Sep 2006 |
| 61 | Eastern American Energy Corp | | Oil & Gas Operator | Dec 2008 |
| 62 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 63 | Emc Energy | | Oil & Gas Operator | Jun 1985 |
| 64 | Energetics Inc | Englewood, CO 80155 | Oil & Gas Operator | Aug 1985 |
| 65 | Energy Operating Company Inc | Lakewood, CO 80235 | Oil & Gas Operator | Dec 2012 |
| 66 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 67 | Entek GRB LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 68 | EOG Y Resources Inc | Artesia, NM 88210 | Oil & Gas Operator | Feb 2019 |
| 69 | Equitable Resources Energy Company | Big Stone Gap, VA 24219 | Oil & Gas Operator | Dec 1997 |
| 70 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 71 | Escalera Resources Co | Casper, WY 82602 | Oil & Gas Operator | May 2018 |
| 72 | Exeter Drilling Company | Denver, CO 80217 | Oil & Gas Operator | Sep 1997 |
| 73 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |
| 74 | Ferguson Bob | Casper, WY 82605 | Oil Operator | May 2004 |
| 75 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Nov 2024 |
| 76 | Foundation Energy Managment LLC | Addison, TX 74119 | Oil & Gas Operator | Oct 2024 |
| 77 | Fuel Resources Development Co | Denver, CO 80202 | Oil & Gas Operator | Feb 1994 |
| 78 | Gary-Williams Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2000 |
| 79 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 80 | GKM Inc | | Oil & Gas Operator | Mar 1990 |
| 81 | GMT Exploration Company LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 82 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 83 | GRB Resources | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2004 |
| 84 | Greenstreet Lloyd | | Oil Operator | Dec 1986 |
| 85 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2024 |
| 86 | GRMR Oil And Gas LLC | Broomfield, CO 80021 | Oil & Gas Operator | Oct 2024 |
| 87 | Gulf Energy Corporation | Denver, CO 80237 | Oil & Gas Operator | Jun 1987 |
| 88 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 89 | Hallador Petroleum LLP | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 90 | Henderson Petroleum Corp | San Angelo, TX 76906 | Oil & Gas Operator | Jul 2013 |
| 91 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Dec 2024 |
| 92 | HRM Resources III LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2022 |
| 93 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2024 |
| 94 | Incline Reserves Inc | Topeka, KS BAD ADDR | Oil & Gas Operator | Mar 1994 |
| 95 | Industrial Gas Services Inc | Wheat Ridge, CO 80033 | Oil & Gas Operator | Feb 2023 |
| 96 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 97 | Integrity Oil & Gas | Golden, CO 80401 | Oil & Gas Operator | May 2011 |
| 98 | Jogruss Oil Corporation | | Oil & Gas Operator | Jul 1991 |
| 99 | Julander Energy Company | Denver, CO 80614 | Oil Operator | Apr 2016 |
| 100 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |