| 1 | 44 Mag Production Inc | | Gas Operator | Mar 2012 |
| 2 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | May 2026 |
| 3 | Bandera Energy Company | | Oil & Gas Operator | Mar 1986 |
| 4 | Banding M R Inc | Gillette, WY 82717 | Oil & Gas Operator | Mar 2026 |
| 5 | Banks And Conrad | | Oil Operator | Sep 1987 |
| 6 | Banks Operating Company | | Oil & Gas Operator | Jul 1989 |
| 7 | Banta And Haigh | Aurora, CO 80014 | Oil & Gas Operator | Feb 1998 |
| 8 | Barbe D F | Recluse, WY 82725 | Oil & Gas Operator | Dec 2000 |
| 9 | Barn Owls LLC | | Oil & Gas Operator | May 2026 |
| 10 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 11 | Baytex Energy USA LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2014 |
| 12 | Bear Oil And Gas Inc | Las Vegas, NV 89107 | Oil & Gas Operator | Jul 2016 |
| 13 | Bearcat Energy LLC (Colorado) | Denver, CO 80202 | Oil & Gas Operator | May 2022 |
| 14 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 15 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | May 2026 |
| 16 | Bellevue Resources Inc | Lakewood, CO 80235 | Oil & Gas Operator | Feb 2009 |
| 17 | Benchmark Energy LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2023 |
| 18 | Benson-Montin-Greer DRLG Corp | Farmington, NM 87402 | Oil & Gas Operator | Jun 2026 |
| 19 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jul 2026 |
| 20 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Jun 2026 |
| 21 | Betop Inc | Ojai, CA 83203 | Oil & Gas Operator | Dec 1996 |
| 22 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 23 | Big Basin Petroleum LLC | Gillette, WY 82717 | Oil & Gas Operator | Oct 2008 |
| 24 | Big Chief Exploration | Palisades, CO 81526 | Oil & Gas Operator | Oct 1993 |
| 25 | Big Piney Oil & Gas Company | Dallas, TX 75206 | Oil & Gas Operator | Sep 1992 |
| 26 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 27 | Black Bear Oil Corporation | Las Vegas, NV 89128 | Oil & Gas Operator | May 2026 |
| 28 | Black Diamond Energy Inc | Pittsburgh, PA 15237 | Gas Operator | May 2016 |
| 29 | Black Hawk Resources Corporation | Denver, CO 80202 | Oil Operator | Mar 1986 |
| 30 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | Mar 2018 |
| 31 | Black Jack Oil Co Inc | Holliday, TX 76366 | Oil & Gas Operator | Apr 2026 |
| 32 | Blackjack Oil, Inc. | Las Vegas, NV 89128 | Oil & Gas Operator | Nov 2019 |
| 33 | Blackstone Operating Inc | Red Lodge, MT 59068 | Gas Operator | Nov 2009 |
| 34 | Blake Production LLC | Gillette, WY 82717 | Oil & Gas Operator | Mar 2026 |
| 35 | Bluebonnet Energy Corporation | Englewood, CO 80112 | Oil & Gas Operator | Sep 2015 |
| 36 | Bowden Energy Company Inc | Gillette, WY 82716 | Oil & Gas Operator | Nov 2025 |
| 37 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 38 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 39 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 40 | Braden Oil | | Oil & Gas Operator | Mar 2007 |
| 41 | Bradley Jr Jack C | Casper, WY 82601 | Oil & Gas Operator | Apr 2009 |
| 42 | Bradley SR Jack C | Newcastle, WY 82701 | Oil Operator | Jun 2010 |
| 43 | Brannon Oil & Gas Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2013 |
| 44 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 45 | Brent Exploration | | Oil & Gas Operator | Dec 1993 |
| 46 | Bridger Petroleum Corp | | Oil & Gas Operator | Oct 1999 |
| 47 | Briscoe Petroleum, LLC | Sheridan, WY 82801 | Oil & Gas Operator | May 2026 |
| 48 | Brower Oil & Gas Inc | Jenks, OK 74037 | Oil & Gas Operator | Nov 2022 |
| 49 | Brown J K Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2003 |
| 50 | Brown Operating Inc | Casper, WY 82602 | Oil & Gas Operator | May 2019 |
| 51 | Brown Shirley | Buffalo, WY 82834 | Oil & Gas Operator | Oct 2010 |
| 52 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 53 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2026 |
| 54 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2026 |
| 55 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 56 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2026 |
| 57 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 58 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jul 2026 |
| 59 | C & H Well Servicing Inc | Gillette, WY 82717 | Oil & Gas Operator | Jun 2026 |
| 60 | Calco Inc | | Oil & Gas Operator | Feb 1991 |
| 61 | Cambria Oil Company | Casper, WY 82601 | Oil & Gas Operator | Dec 1996 |
| 62 | Camwest II LP | McKinney, TX 75070 | Oil & Gas Operator | Jul 2007 |
| 63 | Camwest Limited Partnership | Denver, CO 80202 | Oil & Gas Operator | Apr 2004 |
| 64 | Carbon Creek Energy LLC | Sheridan, WY 82801 | Oil & Gas Operator | Apr 2026 |
| 65 | Cardinal Wyoming LLC | | Oil & Gas Operator | May 2026 |
| 66 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Jun 2026 |
| 67 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 68 | Caza Exploration Company | | Oil Operator | Nov 1991 |
| 69 | Cedar Resources Corporation | Gillette, WY 82717 | Gas Operator | Dec 2010 |
| 70 | Cedar Ridge Operating Co LLC | Durango, CO 81303 | Gas Operator | Dec 2009 |
| 71 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 72 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 73 | Cenergy Resources LLC | | Oil & Gas Operator | Jan 2026 |
| 74 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 75 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 76 | Century Energy | Gillette, WY 82717 | Oil & Gas Operator | Dec 1996 |
| 77 | Century Oil & Gas Corporation | | Oil & Gas Operator | Dec 1987 |
| 78 | Century Oil And Gas LLC | Katy, TX 77494 | Oil & Gas Operator | May 2026 |
| 79 | CH4 Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2006 |
| 80 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | May 2026 |
| 81 | Chambers Jerry | Denver, CO 80237 | Oil & Gas Operator | Dec 1993 |
| 82 | Chandler Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2009 |
| 83 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2026 |
| 84 | Chaparral Resources Inc | Denver, CO 80293 | Oil & Gas Operator | Jan 1996 |
| 85 | Charger Resources, LLC | Hurst, TX 76054 | Oil & Gas Operator | Aug 2015 |
| 86 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 87 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2026 |
| 88 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2026 |
| 89 | Chipcore LLC | Casper, WY 82601 | Oil & Gas Operator | May 2026 |
| 90 | Chriscor Oil & Gas | Plana, TX 75075 | Oil & Gas Operator | Jul 1987 |
| 91 | CHS McPherson Refinery Inc | Platteville, CO 80651 | Oil & Gas Operator | Apr 1994 |
| 92 | Ciris Energy Inc | Centennial, CO 80112 | Gas Operator | Dec 2016 |
| 93 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Jul 2026 |
| 94 | CKT Energy LLC | Dallas, TX 75379 | Oil & Gas Operator | Sep 2020 |
| 95 | CLC Operations Inc | Midland, TX 79701 | Oil & Gas Operator | Mar 1997 |
| 96 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 97 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Apr 2026 |
| 98 | Coal Creek Minerals LLC | Northglenn, CO 80234 | Gas Operator | Feb 2012 |
| 99 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 100 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2026 |