| 1501 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |
| 1502 | Avalon Operating LLC | Tulsa, OK 74119-5401 | Oil & Gas Operator | Apr 2026 |
| 1503 | Avalon TX Operating, LLC | Andrews, TX 79714 | Oil & Gas Operator | Jan 2023 |
| 1504 | Avant Jack E | Skiatook, OK 74070 | Oil Operator | Jan 2013 |
| 1505 | Avant Operating II, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 1506 | Avant Operating, LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 1507 | Avanti Exploration La, LLC | | Oil & Gas Operator | Nov 2024 |
| 1508 | Avatar Energy LLC | Dallas, TX 75220-2230 | Oil & Gas Operator | Jul 2016 |
| 1509 | Aven Gas & Oil Inc | Oklahoma City, OK 73113-0491 | Oil & Gas Operator | Nov 2021 |
| 1510 | Averill, W. M. Inc. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2003 |
| 1511 | Avers Harvey G Energy Expl | | Oil & Gas Operator | May 2013 |
| 1512 | Avery, Irving W. | Buena VIsta, CO 81211 | Oil & Gas Operator | Mar 2008 |
| 1513 | Avian Tech International, Inc. | Euless, TX 76040 | Oil & Gas Operator | Apr 1995 |
| 1514 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 1515 | Aviator Energy, LLC | Plano, TX 75093 | Oil Operator | Jun 2026 |
| 1516 | Avid Energy Assets LLC | Midland, TX 79708 | Oil & Gas Operator | Jun 2026 |
| 1517 | Avighna Energy Inc | Sugar Land, TX 77487 | Oil & Gas Operator | Jan 2019 |
| 1518 | Avips Petroleum, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jun 1996 |
| 1519 | Aviva America, Inc. | | Oil & Gas Operator | Nov 2013 |
| 1520 | Avoca Farms LTD | Avoca, NY 14809 | Gas Operator | Dec 2024 |
| 1521 | Avon Energy Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 1996 |
| 1522 | Avondale Operating Co | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2019 |
| 1523 | Avra Oil Co | Dallas, TX 75248 | Oil & Gas Operator | Jun 2026 |
| 1524 | Aw Hembree Co | Shawnee, OK 74802-1725 | Oil & Gas Operator | Mar 2026 |
| 1525 | Aw Tipka Oil & Gas Inc | Dover, OH 44622 | Oil & Gas Operator | Dec 2025 |
| 1526 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Jun 2026 |
| 1527 | Ax Operating, L.L.C. | | Oil & Gas Operator | Jul 2018 |
| 1528 | Axem Resources I | | Oil Operator | Aug 1995 |
| 1529 | Axem Resources Inc | Denver, CO 80202-4617 | Oil & Gas Operator | Jul 2013 |
| 1530 | Axeon Energy Operations LLC | Evergreen, CO 80439-7624 | Oil Operator | Jul 2015 |
| 1531 | Axia Energy II LLC | HGHLNDS Ranch, CO 80129 | Oil & Gas Operator | Jan 2020 |
| 1532 | Axia Energy III, LLC | Highlands Ranch, CO 80129 | Oil & Gas Operator | Mar 2026 |
| 1533 | Axia Energy LLC | Hghlands Ranch, CO 80129-2258 | Oil & Gas Operator | Apr 2015 |
| 1534 | Axio Production Company, L.P. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2006 |
| 1535 | Axiom Tep, LLC | | Oil & Gas Operator | May 2015 |
| 1536 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Jun 2026 |
| 1537 | Axis Exploration LLC | | Oil & Gas Operator | Mar 2026 |
| 1538 | Axis Onshore, LLC | | Oil & Gas Operator | Apr 2008 |
| 1539 | Axis Onshore, LP | | Oil & Gas Operator | Dec 2010 |
| 1540 | Axis Petroleum Co. | | Oil & Gas Operator | Dec 2022 |
| 1541 | Axp Energy, Inc | Lexington, KY 40509 | Oil & Gas Operator | Dec 2023 |
| 1542 | Axtel Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Jun 2026 |
| 1543 | Aycox Robert D | Healdton, OK 73438 | Oil Operator | Sep 2022 |
| 1544 | Ayer, Robert & Ann | Hartford, KY 42347 | Oil Operator | Dec 2024 |
| 1545 | Ayers Oil Co. | Crystal City, TX 78839 | Oil & Gas Operator | Sep 1995 |
| 1546 | Ayers, R.B. | Sidney, TX 76474 | Oil & Gas Operator | Apr 2003 |
| 1547 | Aylward Drilling | | Oil & Gas Operator | Dec 1986 |
| 1548 | Ayres, C. D. | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2026 |
| 1549 | Ayres, Joe D. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2004 |
| 1550 | Azar Marsha | Chicago, IL 60618 | Oil Operator | Jan 2025 |
| 1551 | Azariah Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | Apr 2026 |
| 1552 | Azco Opr Co | Phoenix, AZ 85076-0535 | Oil & Gas Operator | Dec 2001 |
| 1553 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 1554 | Azkan Oil & Gas LLC | | Oil Operator | Jul 2024 |
| 1555 | Aztec Drilling & Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2015 |
| 1556 | Aztec Energy, LLC | Wichita Falls, TX 76301 | Oil Operator | Jun 2026 |
| 1557 | Aztec Exploration Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2013 |
| 1558 | Aztec Gas & Oil Corp. | Elephant Butte, NM 87935-0370 | Gas Operator | Mar 2005 |
| 1559 | Aztec Oil & Gas Company | | Oil & Gas Operator | Mar 1978 |
| 1560 | Aztec Oil & Gas Company "A" | Wichita Falls, TX 76309 | Oil & Gas Operator | Sep 2010 |
| 1561 | Aztec Oil Co | | Oil & Gas Operator | Dec 1977 |
| 1562 | Aztec Oil Operating LLC | El Dorado, KS 67042 | Oil & Gas Operator | Feb 2026 |
| 1563 | Aztec Producing Company Inc | | Oil & Gas Operator | May 2022 |
| 1564 | Aztec Production Company | | Oil & Gas Operator | Jan 1996 |
| 1565 | Azteca Operating, Inc. | Electra, TX 76360 | Oil Operator | Jun 2026 |
| 1566 | Azteca Petroleum, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Jun 2026 |
| 1567 | Aztel Operating Inc. | Windthorst, TX 76389 | Oil Operator | Oct 2003 |
| 1568 | Aztex Petroleum | Chandler, AZ 85249 | Oil & Gas Operator | Jun 2026 |
| 1569 | Azul Operating, LLC | | Gas Operator | Dec 2024 |
| 1570 | Azul, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 1995 |
| 1571 | Azure Energy LTD | Tulsa, OK 74135-7825 | Oil & Gas Operator | Apr 2026 |