| 1601 | Avon Energy Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 1996 |
| 1602 | Avondale Operating Co | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2019 |
| 1603 | Avra Oil Co | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |
| 1604 | Aw Hembree Co | Shawnee, OK 74802-1725 | Oil & Gas Operator | Aug 2025 |
| 1605 | Aw Tipka Oil & Gas Inc | Dover, OH 44622 | Oil & Gas Operator | Dec 2024 |
| 1606 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Dec 2025 |
| 1607 | Ax Operating, L.L.C. | | Oil & Gas Operator | Jul 2018 |
| 1608 | Axem Resources I | | Oil Operator | Aug 1995 |
| 1609 | Axem Resources Inc | Denver, CO 80202-4617 | Oil & Gas Operator | Jul 2013 |
| 1610 | Axeon Energy Operations LLC | Evergreen, CO 80439-7624 | Oil Operator | Jul 2015 |
| 1611 | Axia Energy II LLC | HGHLNDS Ranch, CO 80129 | Oil & Gas Operator | Jan 2020 |
| 1612 | Axia Energy III LLC | Highlands Ranch, CO 80129 | Oil & Gas Operator | Aug 2025 |
| 1613 | Axia Energy LLC | Hghlands Ranch, CO 80129-2258 | Oil & Gas Operator | Apr 2015 |
| 1614 | Axio Production Company, L.P. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2006 |
| 1615 | Axiom Energy LLC | Park City, UT 84098 | Oil Operator | Feb 2010 |
| 1616 | Axiom Tep, LLC | | Oil & Gas Operator | May 2015 |
| 1617 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Dec 2025 |
| 1618 | Axis Exploration LLC | | Oil & Gas Operator | Sep 2025 |
| 1619 | Axis Onshore, LLC | | Oil & Gas Operator | Apr 2008 |
| 1620 | Axis Onshore, LP | | Oil & Gas Operator | Dec 2010 |
| 1621 | Axis Petroleum Co. | | Oil & Gas Operator | Dec 2022 |
| 1622 | Axp Energy, Inc | Lexington, KY 40509 | Oil & Gas Operator | Dec 2023 |
| 1623 | Axtel Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Dec 2025 |
| 1624 | Aycox Robert D | Healdton, OK 73438 | Oil Operator | Sep 2022 |
| 1625 | Ayers Oil Co. | Crystal City, TX 78839 | Oil & Gas Operator | Sep 1995 |
| 1626 | Ayers, R.B. | Sidney, TX 76474 | Oil & Gas Operator | Apr 2003 |
| 1627 | Ayluma Operating Inc | Dewar, OK 74437 | Oil & Gas Operator | Oct 2024 |
| 1628 | Aylward Drilling | | Oil & Gas Operator | Dec 1986 |
| 1629 | Ayres, C. D. | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 2025 |
| 1630 | Ayres, Joe D. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2004 |
| 1631 | Azar Marsha | Chicago, IL 60618 | Oil Operator | Jan 2025 |
| 1632 | Azariah Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | Sep 2025 |
| 1633 | Azco Opr Co | Phoenix, AZ 85076-0535 | Oil & Gas Operator | Dec 2001 |
| 1634 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 1635 | Azkan Oil & Gas LLC | | Oil Operator | Jul 2024 |
| 1636 | Aztec Drilling & Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2015 |
| 1637 | Aztec Energy, LLC | Wichita Falls, TX 76301 | Oil Operator | Dec 2025 |
| 1638 | Aztec Exploration Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2013 |
| 1639 | Aztec Gas And Oil Corporation | Elephant Butte, NM 87935-0370 | Oil & Gas Operator | Mar 2005 |
| 1640 | Aztec Oil & Gas Company | | Oil & Gas Operator | Mar 1978 |
| 1641 | Aztec Oil & Gas Company "A" | Wichita Falls, TX 76309 | Oil & Gas Operator | Sep 2010 |
| 1642 | Aztec Oil Co | | Oil & Gas Operator | Dec 1977 |
| 1643 | Aztec Oil Operating LLC | El Dorado, KS 67042 | Oil & Gas Operator | Jun 2025 |
| 1644 | Aztec Producing Company Inc | | Oil & Gas Operator | May 2022 |
| 1645 | Aztec Production Company | | Oil & Gas Operator | Jan 1996 |
| 1646 | Aztec-Solatex | | Gas Operator | Aug 1978 |
| 1647 | Azteca Operating, Inc. | Electra, TX 76360 | Oil Operator | Dec 2025 |
| 1648 | Azteca Petroleum, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Dec 2025 |
| 1649 | Aztel Operating Inc. | Windthorst, TX 76389 | Oil Operator | Oct 2003 |
| 1650 | Aztex Petroleum | Chandler, AZ 85249 | Oil & Gas Operator | Dec 2025 |
| 1651 | Azul Operating, LLC | | Gas Operator | Dec 2024 |
| 1652 | Azul, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 1995 |
| 1653 | Azure Energy LTD | Tulsa, OK 74135-7825 | Oil & Gas Operator | Sep 2025 |