| 1 | 1876 Resources LLC | Highlands Ranch, CO 80129 | Oil & Gas Operator | May 2025 |
| 2 | 31 Operating | | Oil & Gas Operator | Jul 2022 |
| 3 | 4-H Operating Corporation | | Oil & Gas Operator | Oct 2017 |
| 4 | 44 Canyon LLC | | Gas Operator | Mar 2006 |
| 5 | 8 North LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 6 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Jul 2025 |
| 7 | Abundance Energy Services LLC | Tulsa, OK 74114 | Gas Operator | May 2025 |
| 8 | Aceite Energy Corp | | Oil & Gas Operator | Feb 2007 |
| 9 | Advanced Wireless Communications LLC | Farmington, NM 87401 | Oil & Gas Operator | May 2025 |
| 10 | Advantage Resources Inc | Broomfield, CO 80020 | Oil & Gas Operator | Mar 2025 |
| 11 | Aec Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | May 2004 |
| 12 | Aeon Energy Corp | | Oil & Gas Operator | May 2025 |
| 13 | Alamosa Drilling Inc | Dallas, TX 75206-1841 | Oil & Gas Operator | Apr 2024 |
| 14 | Alan Howard Karchmer Living Trust | | Oil Operator | Dec 2022 |
| 15 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Jul 2025 |
| 16 | American Helium LLC | | Oil & Gas Operator | Apr 2025 |
| 17 | American International Energy Corp | | Oil & Gas Operator | Oct 2003 |
| 18 | American Petroleum Energy Co | | Gas Operator | May 2025 |
| 19 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 20 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 21 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 22 | Andrikopoulos Resources* A G | | Oil & Gas Operator | Jul 2015 |
| 23 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 24 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 25 | Antelope Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 26 | Antero Resources Piceance LLC | | Oil & Gas Operator | Dec 2012 |
| 27 | Antler Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | Apr 2025 |
| 28 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Jul 2025 |
| 29 | Apex Oil Ventures Inc | | Oil & Gas Operator | Apr 2025 |
| 30 | Apollo Operating LLC | | Oil & Gas Operator | Sep 2013 |
| 31 | Arch Oil & Gas, LLC | Dallas, TX 75254 | Oil & Gas Operator | Jul 2025 |
| 32 | Arco Permian, A Div Of Atlantic Richfield Company | | Gas Operator | Dec 2001 |
| 33 | Argali Exploration Company | | Gas Operator | Dec 2024 |
| 34 | Argonex Company LLC | | Oil & Gas Operator | Jan 2024 |
| 35 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 36 | Ark Trust, Carol W Byrd Trustee | | Oil Operator | May 2025 |
| 37 | Arkoma Operations LLC | Tulsa, OK 74114-3502 | Oil & Gas Operator | Apr 2025 |
| 38 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 39 | Arp Production Company, LLC | Fort Worth, TX 76102 | Gas Operator | Mar 2025 |
| 40 | Atlas Resources LLC Dba Atlas Rockies LLC | | Gas Operator | Jun 2017 |
| 41 | Augustus Energy Partners LLC | Billings, MT 59102 | Oil & Gas Operator | Feb 2014 |
| 42 | Augustus Energy Resources LLC | | Oil & Gas Operator | Jun 2018 |
| 43 | Aurora Power Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Aug 2018 |
| 44 | Aus-Tex Exploration Inc | | Oil & Gas Operator | Jun 2025 |
| 45 | Ausmus & Clark Oil | | Oil Operator | Jul 2022 |
| 46 | Axia Energy LLC | Hghlands Ranch, CO 80129-2258 | Oil & Gas Operator | Jun 2016 |
| 47 | Axis Exploration LLC | | Oil & Gas Operator | Apr 2025 |
| 48 | Ballard Petroleum LLC | Billings, MT 59102-5406 | Oil & Gas Operator | Apr 2014 |
| 49 | Baney Well Service Inc | Denver, CO 80237 | Oil Operator | Jun 2016 |
| 50 | Barfield Oil Corporation | | Oil & Gas Operator | Mar 2001 |
| 51 | Barrett Corporation* Bill | | Oil & Gas Operator | Apr 2025 |
| 52 | Barrett Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 53 | Basin Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 54 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 55 | Bataa Oil Inc | Arvada, CO 80005 | Oil & Gas Operator | May 2025 |
| 56 | Bates* James Edward | | Oil & Gas Operator | Jul 2017 |
| 57 | Bayhorse Petroleum LLC | | Oil Operator | Dec 2016 |
| 58 | Bayless Producer LLC* Robert L | | Oil & Gas Operator | Apr 2025 |
| 59 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 60 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | May 2025 |
| 61 | Becca Oil LLC | Cushing, OK 74023-1347 | Oil & Gas Operator | Apr 2025 |
| 62 | Beeman Oil & Gas LLC | | Oil & Gas Operator | May 2025 |
| 63 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 64 | Benchmark Energy LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2023 |
| 65 | Benchmark Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 66 | Benson-Montin-Greer DRLG Corp | Farmington, NM 87402 | Oil & Gas Operator | May 2025 |
| 67 | Bepco Operating Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2006 |
| 68 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 69 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | May 2025 |
| 70 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 71 | Berry Energy Inc*Walter | | Oil & Gas Operator | Feb 2017 |
| 72 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | May 2025 |
| 73 | Bic Petroleum Inc | | Oil & Gas Operator | Sep 2002 |
| 74 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 75 | Bison Energy Corporation | Wichita, KS 67206 | Oil & Gas Operator | Mar 2022 |
| 76 | Bison IV Operating LLC | | Oil & Gas Operator | May 2025 |
| 77 | Black Diamond Minerals LLC | | Oil & Gas Operator | Jun 2014 |
| 78 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | May 2018 |
| 79 | Black Hills Plateau Production LLC | | Oil & Gas Operator | May 2018 |
| 80 | Black Raven Energy Inc | | Oil & Gas Operator | Apr 2017 |
| 81 | Blackrock Energy Corp | | Oil Operator | Apr 2025 |
| 82 | Blue & Gray Energy Inc | | Oil & Gas Operator | Jun 2011 |
| 83 | Blue Chip Oil Inc | | Oil & Gas Operator | May 2025 |
| 84 | Blue Creek Inc | Fort Worth, TX 76181 | Oil & Gas Operator | Dec 2002 |
| 85 | Bonanza Creek Energy Operating Company LLC | | Oil & Gas Operator | Apr 2025 |
| 86 | Bonneville Fuels Corp | Denver, CO 80290 | Oil & Gas Operator | Jun 2002 |
| 87 | Booco'S Contract Services Inc | | Oil & Gas Operator | Jan 2021 |
| 88 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 89 | Boulder Oil Company | | Oil & Gas Operator | Sep 2004 |
| 90 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 91 | Brandly Oilman Consultants Inc | | Oil & Gas Operator | Mar 2006 |
| 92 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 93 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 94 | Brito Oil Co., Inc | Wichita, KS 67201 | Oil & Gas Operator | Dec 2009 |
| 95 | Brooks Exploration, Inc. | Denver, CO 80293 | Oil & Gas Operator | Mar 2001 |
| 96 | Brown Oil & Gas LLC | | Oil & Gas Operator | Apr 2025 |
| 97 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 98 | Btu Energy | | Gas Operator | Aug 2009 |
| 99 | Burlington Resources Oil & Gas LP | | Oil & Gas Operator | Feb 2020 |
| 100 | Burr Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Oct 2019 |