| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 2 | Aceite Energy Corp | | Oil & Gas Operator | Feb 2007 |
| 3 | Advanced Wireless Communications LLC | Farmington, NM 87401 | Oil & Gas Operator | Feb 2024 |
| 4 | Advantage Resources Inc | Broomfield, CO 80020 | Oil & Gas Operator | Dec 2023 |
| 5 | Aec Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | May 2004 |
| 6 | Aeon Energy Corp | | Oil & Gas Operator | Feb 2024 |
| 7 | Alamosa Drilling Inc | Dallas, TX 75206-1841 | Oil & Gas Operator | Jan 2024 |
| 8 | Alan Howard Karchmer Living Trust | | Oil Operator | Dec 2022 |
| 9 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Apr 2024 |
| 10 | American International Energy Corp | | Oil & Gas Operator | Oct 2003 |
| 11 | American Petroleum Energy Co | | Gas Operator | Feb 2024 |
| 12 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 13 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 14 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 15 | Andrikopoulos Resources* A G | | Oil & Gas Operator | Jul 2015 |
| 16 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 17 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 18 | Antelope Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2024 |
| 19 | Antero Resources Piceance LLC | | Oil & Gas Operator | Dec 2012 |
| 20 | Antler Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | Nov 2023 |
| 21 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 22 | Apex Oil Ventures Inc | | Oil & Gas Operator | Dec 2023 |
| 23 | Apollo Operating LLC | | Oil & Gas Operator | Sep 2013 |
| 24 | Arch Oil & Gas LLC | Dallas, TX 75248 | Oil & Gas Operator | Apr 2024 |
| 25 | Arco Permian, A Div Of Atlantic Richfield Company | | Gas Operator | Dec 2001 |
| 26 | Argali Exploration Company | | Gas Operator | Feb 2024 |
| 27 | Argonex Company LLC | | Oil & Gas Operator | Jan 2024 |
| 28 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 29 | Ark Trust, Carol W Byrd Trustee | | Oil Operator | Feb 2024 |
| 30 | Arkoma Operations LLC | | Oil & Gas Operator | Jan 2024 |
| 31 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 32 | Arp Production Company, LLC | Fort Worth, TX 76116 | Gas Operator | Nov 2023 |
| 33 | Atlas Resources LLC Dba Atlas Rockies LLC | | Gas Operator | Jun 2017 |
| 34 | Augustus Energy Partners LLC | Billings, MT 59102 | Oil & Gas Operator | Feb 2014 |
| 35 | Augustus Energy Resources LLC | | Oil & Gas Operator | Jun 2018 |
| 36 | Aurora Power Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Aug 2018 |
| 37 | Aus-Tex Exploration Inc | | Oil & Gas Operator | Jan 2024 |
| 38 | Ausmus & Clark Oil | | Oil Operator | Jul 2022 |
| 39 | Axia Energy LLC | Hghlands Ranch, CO 80129-2258 | Oil & Gas Operator | Jun 2016 |
| 40 | Axis Exploration LLC | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2024 |