| 1601 | Axiom Energy LLC | Park City, UT 84098 | Oil Operator | Feb 2010 |
| 1602 | Axiom Tep, LLC | | Oil & Gas Operator | May 2015 |
| 1603 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Sep 2025 |
| 1604 | Axis Exploration LLC | | Oil & Gas Operator | Jun 2025 |
| 1605 | Axis Onshore, LLC | | Oil & Gas Operator | Apr 2008 |
| 1606 | Axis Onshore, LP | | Oil & Gas Operator | Dec 2010 |
| 1607 | Axis Petroleum Co. | | Oil & Gas Operator | Dec 2022 |
| 1608 | Axp Energy, Inc | Lexington, KY 40509 | Oil & Gas Operator | Dec 2023 |
| 1609 | Axtel Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Sep 2025 |
| 1610 | Aycox Robert D | Healdton, OK 73438 | Oil Operator | Sep 2022 |
| 1611 | Ayers Oil Co. | Crystal City, TX 78839 | Oil & Gas Operator | Sep 1995 |
| 1612 | Ayers, R.B. | Sidney, TX 76474 | Oil & Gas Operator | Apr 2003 |
| 1613 | Ayluma Operating Inc | Dewar, OK 74437 | Oil & Gas Operator | Oct 2024 |
| 1614 | Aylward Drilling | | Oil & Gas Operator | Dec 1986 |
| 1615 | Ayres, C. D. | Iowa Park, TX 76367 | Oil & Gas Operator | Sep 2025 |
| 1616 | Ayres, Joe D. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2004 |
| 1617 | Azalea Oil Company LLC | Castle Rock, CO 80108 | Oil Operator | Jul 2025 |
| 1618 | Azar Marsha | Chicago, IL 60618 | Oil Operator | Jan 2025 |
| 1619 | Azco Opr Co | Phoenix, AZ 85076-0535 | Oil & Gas Operator | Dec 2001 |
| 1620 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 1621 | Azkan Oil & Gas LLC | | Oil Operator | Jul 2024 |
| 1622 | Aztec Drilling & Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2015 |
| 1623 | Aztec Energy, LLC | Wichita Falls, TX 76301 | Oil Operator | Sep 2025 |
| 1624 | Aztec Exploration Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2013 |
| 1625 | Aztec Gas And Oil Corporation | Elephant Butte, NM 87935-0370 | Oil & Gas Operator | Mar 2005 |
| 1626 | Aztec Oil & Gas Company | | Oil & Gas Operator | Mar 1978 |
| 1627 | Aztec Oil & Gas Company "A" | Wichita Falls, TX 76309 | Oil & Gas Operator | Sep 2010 |
| 1628 | Aztec Oil Co | | Oil & Gas Operator | Dec 1977 |
| 1629 | Aztec Oil Operating LLC | El Dorado, KS 67042 | Oil & Gas Operator | Apr 2025 |
| 1630 | Aztec Producing Company Inc | | Oil & Gas Operator | May 2022 |
| 1631 | Aztec Production Company | | Oil & Gas Operator | Jan 1996 |
| 1632 | Azteca Operating, Inc. | Electra, TX 76360 | Oil Operator | Sep 2025 |
| 1633 | Azteca Petroleum, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Sep 2025 |
| 1634 | Aztel Operating Inc. | Windthorst, TX 76389 | Oil Operator | Oct 2003 |
| 1635 | Aztex Petroleum | Chandler, AZ 85249 | Oil & Gas Operator | Sep 2025 |
| 1636 | Azul Operating, LLC | | Gas Operator | Dec 2024 |
| 1637 | Azul, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 1995 |
| 1638 | Azure Energy LTD | Tulsa, OK 74135-7825 | Oil & Gas Operator | Jun 2025 |