| 1 | Abarta Oil & Gas Co., Inc. | Pittsburgh, PA 15238 | Oil & Gas Operator | Dec 2020 |
| 2 | Abarta Oil & Gas Co., LLC | | Oil & Gas Operator | Dec 2021 |
| 3 | Alexander Production Company | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2021 |
| 4 | Alliance Petroleum Co., LLC | | Oil & Gas Operator | Dec 2021 |
| 5 | Anderson, E D | Cisco, TX 76437 | Oil & Gas Operator | Nov 2009 |
| 6 | Anja Resources | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2021 |
| 7 | Antero Resources Bluestone LLC | | Gas Operator | Dec 2013 |
| 8 | Antero Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 9 | Anvil Oil Co., Inc. | Bartlesville, OK 74003-5030 | Oil & Gas Operator | Dec 2008 |
| 10 | Aries Petroleum Corp. | Big Springs, WV 26137 | Oil & Gas Operator | Dec 2021 |
| 11 | Arsenal Resources LLC | Wexford, PA 15090 | Oil & Gas Operator | Dec 2021 |
| 12 | Ascent Resources - Marcellus, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2021 |