| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 2 | Alpha Energy LLC | Ashland, OR 97520 | Oil & Gas Operator | Dec 2023 |
| 3 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 4 | American Eagle Oil | Casper, WY 82605 | Oil & Gas Operator | Dec 2012 |
| 5 | Aminoil USA Inc | | Oil & Gas Operator | Jan 1985 |
| 6 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 7 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 8 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 9 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 10 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 11 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 12 | Anschutz Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2016 |
| 13 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 14 | Antler Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | Nov 2023 |
| 15 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 16 | Arabie, Inc. | Lake Charles, LA 70605 | Oil & Gas Operator | Apr 2024 |
| 17 | Arkland Producing Co Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2023 |
| 18 | Axem Resources Inc | Denver, CO 80202-4617 | Oil & Gas Operator | Jul 2013 |
| 19 | Aztec Gas And Oil Corporation | Elephant Butte, NM 87935-0370 | Oil & Gas Operator | Mar 2005 |
| 20 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Feb 2024 |
| 21 | Bannon Energy Inc | Houston, TX 77068 | Oil & Gas Operator | Jun 1998 |
| 22 | Barrel Springs Development Corp | Denver, CO 80202 | Oil & Gas Operator | Oct 1986 |
| 23 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 24 | Bataa Oil Inc | Greeley, CO 80634 | Oil & Gas Operator | Feb 2024 |
| 25 | Bayless Robert L Producer | Denver, CO 80293 | Oil & Gas Operator | Sep 2003 |
| 26 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2024 |
| 27 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 28 | Berco Resources LLC | Denver, CO 80206 | Oil & Gas Operator | Sep 2009 |
| 29 | BHP Petroleum (USA) Inc | | Oil & Gas Operator | Mar 1993 |
| 30 | Big Piney Oil & Gas Company | Dallas, TX 75206 | Oil & Gas Operator | Sep 1992 |
| 31 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 32 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | May 2018 |
| 33 | Blackjack Oil, Inc. | Las Vegas, NV 89128 | Oil & Gas Operator | Nov 2019 |
| 34 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 35 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 36 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 37 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2023 |
| 38 | Breitburn Operating, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 39 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 40 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 41 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 42 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 43 | C & K Petroleum | | Oil & Gas Operator | Jan 1984 |
| 44 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Dec 2023 |
| 45 | Caerus Northern Rockies LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2021 |
| 46 | Cambria Oil Company | Casper, WY 82601 | Oil & Gas Operator | Dec 1996 |
| 47 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Feb 2024 |
| 48 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 49 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 50 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Feb 2024 |
| 51 | Chambers Jerry | Denver, CO 80237 | Oil & Gas Operator | Dec 1993 |
| 52 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2024 |
| 53 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 54 | Chriscor Oil & Gas | Plana, TX 75075 | Oil & Gas Operator | Jul 1987 |
| 55 | Christmann John J | Lubbock, TX 79401 | Oil & Gas Operator | Dec 1994 |
| 56 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 57 | Coastal Chem Inc | Midvale, UT 84047 | Oil & Gas Operator | Aug 2003 |
| 58 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 59 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 60 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Feb 2024 |
| 61 | Cohort Energy Company | Centennial, CO 80112 | Oil & Gas Operator | Feb 2007 |
| 62 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2023 |
| 63 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 64 | Columbine Exploration Corp | Englewood, CO 80111 | Oil & Gas Operator | Aug 1998 |
| 65 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 66 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 67 | Contango Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 68 | Continental Industries LC | Casper, WY 82602 | Oil & Gas Operator | Feb 2008 |
| 69 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 70 | Crowheart Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | Jan 2024 |
| 71 | Crown Energy Partners LLC | Englewood, CO 80112 | Oil & Gas Operator | Sep 2013 |
| 72 | Crown Oil & Gas Co Inc | Labarge, WY 83123 | Oil & Gas Operator | Jan 2023 |
| 73 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 74 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 75 | Davis Oil Company | Pawhuska, OK 74056 | Oil & Gas Operator | Jun 2018 |
| 76 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 77 | Deca Energy Corporation | | Oil & Gas Operator | Aug 1986 |
| 78 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 79 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 80 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 81 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | Feb 2024 |
| 82 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Dec 2016 |
| 83 | Dietrich Resources Corporation | | Oil & Gas Operator | Jun 2007 |
| 84 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Feb 2024 |
| 85 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 86 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 87 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 88 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 89 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 90 | El Paso Natural Gas Company | El Paso, TX 79978 | Oil & Gas Operator | Apr 2013 |
| 91 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jan 2024 |
| 92 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 93 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Feb 2024 |
| 94 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Jan 2021 |
| 95 | Energen Resources Maq Inc | Birmingham, AL 35203 | Oil & Gas Operator | Sep 2000 |
| 96 | Energetics Inc | Englewood, CO 80155 | Oil & Gas Operator | Aug 1985 |
| 97 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Jan 2024 |
| 98 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 99 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 100 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |