| 1 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Mar 2024 |
| 2 | Bandera Energy Company | | Oil & Gas Operator | Mar 1986 |
| 3 | Banding M R Inc | Gillette, WY 82717 | Oil & Gas Operator | Apr 2024 |
| 4 | Banks And Conrad | | Oil Operator | Sep 1987 |
| 5 | Banks Operating Company | | Oil & Gas Operator | Jul 1989 |
| 6 | Banta And Haigh | Aurora, CO 80014 | Oil & Gas Operator | Feb 1998 |
| 7 | Barbe D F | Recluse, WY 82725 | Oil & Gas Operator | Dec 2000 |
| 8 | Barn Owls LLC | | Oil & Gas Operator | Mar 2024 |
| 9 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 10 | Baytex Energy USA LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2014 |
| 11 | Bear Oil And Gas Inc | Las Vegas, NV 89107 | Oil & Gas Operator | Jul 2016 |
| 12 | Bearcat Energy LLC (Colorado) | Denver, CO 80202 | Oil & Gas Operator | May 2022 |
| 13 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 14 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Mar 2024 |
| 15 | Bellevue Resources Inc | Lakewood, CO 80235 | Oil & Gas Operator | Feb 2009 |
| 16 | Benchmark Energy LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2023 |
| 17 | Benson-Montin-Greer DRLG Corp | Farmington, NM 87402 | Oil & Gas Operator | Mar 2024 |
| 18 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | May 2024 |
| 19 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Apr 2024 |
| 20 | Betop Inc | Ojai, CA 83203 | Oil & Gas Operator | Dec 1996 |
| 21 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 22 | Big Basin Petroleum LLC | Gillette, WY 82717 | Oil & Gas Operator | Oct 2008 |
| 23 | Big Chief Exploration | Palisades, CO 81526 | Oil & Gas Operator | Oct 1993 |
| 24 | Big Piney Oil & Gas Company | Dallas, TX 75206 | Oil & Gas Operator | Sep 1992 |
| 25 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 26 | Black Bear Oil Corporation | Las Vegas, NV 89128 | Oil & Gas Operator | Feb 2024 |
| 27 | Black Diamond Energy Inc | Pittsburgh, PA 15237 | Gas Operator | May 2016 |
| 28 | Black Hawk Resources Corporation | Denver, CO 80202 | Oil Operator | Mar 1986 |
| 29 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | May 2018 |
| 30 | Black Jack Oil Co Inc | Holliday, TX 76366 | Oil & Gas Operator | Feb 2024 |
| 31 | Blackjack Oil, Inc. | Las Vegas, NV 89128 | Oil & Gas Operator | Nov 2019 |
| 32 | Blackstone Operating Inc | Red Lodge, MT 59068 | Gas Operator | Nov 2009 |
| 33 | Blake Production LLC | Gillette, WY 82717 | Oil & Gas Operator | Mar 2024 |
| 34 | Bluebonnet Energy Corporation | Englewood, CO 80112 | Oil & Gas Operator | Sep 2015 |
| 35 | Bowden Energy Company Inc | Gillette, WY 82716 | Oil & Gas Operator | Feb 2024 |
| 36 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 37 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 38 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 39 | Braden Oil | | Oil & Gas Operator | Mar 2007 |
| 40 | Bradley Jr Jack C | Casper, WY 82601 | Oil & Gas Operator | Apr 2009 |
| 41 | Bradley SR Jack C | Newcastle, WY 82701 | Oil Operator | Jun 2010 |
| 42 | Brannon Oil & Gas Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2013 |
| 43 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2024 |
| 44 | Brent Exploration | | Oil & Gas Operator | Dec 1993 |
| 45 | Bridger Petroleum Corp | | Oil & Gas Operator | Oct 1999 |
| 46 | Briscoe Petroleum, LLC | Sheridan, WY 82801 | Oil & Gas Operator | Mar 2024 |
| 47 | Brower Oil & Gas Inc | Jenks, OK 74037 | Oil & Gas Operator | Nov 2022 |
| 48 | Brown J K Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2003 |
| 49 | Brown Operating Inc | Casper, WY 82602 | Oil & Gas Operator | May 2019 |
| 50 | Brown Shirley | Buffalo, WY 82834 | Oil & Gas Operator | Oct 2010 |
| 51 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 52 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 53 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2024 |
| 54 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 55 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2024 |
| 56 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 57 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | May 2024 |