| 1501 | Ausanka Oil Operations | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 1502 | Ausland Production Company | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 1503 | Ausmus & Clark Oil | | Oil Operator | Jul 2022 |
| 1504 | Auster Oil And Gas, Inc. | | Oil & Gas Operator | Mar 1989 |
| 1505 | Auster Oil And Gas, Inc. Et Al | | Oil & Gas Operator | May 2001 |
| 1506 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 1507 | Austin E. Stewart | | Oil & Gas Operator | Feb 1979 |
| 1508 | Austin Energy LLC | | Oil Operator | Mar 2026 |
| 1509 | Austin Energy Operations, Inc. | Corpus Christ, TX 78410 | Oil & Gas Operator | Jun 2026 |
| 1510 | Austin Minerals Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Jun 2026 |
| 1511 | Austin Oil Company | | Oil & Gas Operator | Dec 2000 |
| 1512 | Austin Operating, LLC. | Chicago, IL 60622 | Oil Operator | Jun 2026 |
| 1513 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 1514 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 1515 | Austin Ridge Energy Corporation | Houston, TX 77224 | Oil & Gas Operator | Jun 2026 |
| 1516 | Austin Robert L | Stafford, KS 67578 | Oil & Gas Operator | Dec 1999 |
| 1517 | Austin, Chas W | | Oil Operator | Jan 2009 |
| 1518 | Austin, Dewey | Burkburnett, TX 76354 | Oil & Gas Operator | Nov 1996 |
| 1519 | Austin, John F. | Baton Rouge, LA 70879 | Oil Operator | May 1992 |
| 1520 | Austin, Robert E. | Miami, OK 74354 | Oil Operator | Dec 1995 |
| 1521 | Austral Oil & Exploration, Inc | | Oil & Gas Operator | Jun 2004 |
| 1522 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 1523 | Australis TMS Inc. | | Oil & Gas Operator | Dec 2024 |
| 1524 | Auterra Operating, LLC | Friendswood, TX 77549 | Oil & Gas Operator | Jun 2026 |
| 1525 | Autry C. Stephens | Midland, TX 79701 | Oil & Gas Operator | Dec 2001 |
| 1526 | Autry Producing Co. | Cisco, TX 76437 | Oil & Gas Operator | Aug 2008 |
| 1527 | Autry Producing Inc. | Cisco, TX 76437 | Oil Operator | Jun 2026 |
| 1528 | Autry, Martin | Seguin, TX 78155 | Oil Operator | Jun 2026 |
| 1529 | Autumn Energy LLC | Andrews, TX 79714 | Oil Operator | Aug 2017 |
| 1530 | Autumn Energy Operating | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 1531 | Autumn Ridge Energy LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2025 |
| 1532 | Autumn Ridge Enterprises LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2017 |
| 1533 | Av-Tech Resources Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2022 |
| 1534 | Av3 Resources, LLC | Midland, TX 79706 | Oil Operator | Jun 2026 |
| 1535 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Jun 2026 |
| 1536 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jun 2026 |
| 1537 | Avalon Energy Corporation | | Oil & Gas Operator | Jul 1990 |
| 1538 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |
| 1539 | Avalon Operating LLC | Tulsa, OK 74119-5401 | Oil & Gas Operator | Jan 2026 |
| 1540 | Avalon TX Operating, LLC | Andrews, TX 79714 | Oil & Gas Operator | Jan 2023 |
| 1541 | Avant Jack E | Skiatook, OK 74070 | Oil Operator | Jan 2013 |
| 1542 | Avant Operating II, LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2026 |
| 1543 | Avant Operating, LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 1544 | Avanti Exploration La, LLC | | Oil & Gas Operator | Nov 2024 |
| 1545 | Avatar Energy LLC | Dallas, TX 75220-2230 | Oil & Gas Operator | Jul 2016 |
| 1546 | Aven Gas & Oil Inc | Oklahoma City, OK 73113-0491 | Oil & Gas Operator | Nov 2021 |
| 1547 | Averill, W. M. Inc. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2003 |
| 1548 | Avers Harvey G Energy Expl | | Oil & Gas Operator | May 2013 |
| 1549 | Avery, Irving W. | Buena VIsta, CO 81211 | Oil & Gas Operator | Mar 2008 |
| 1550 | Avian Tech International, Inc. | Euless, TX 76040 | Oil & Gas Operator | Apr 1995 |
| 1551 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 1552 | Aviator Energy, LLC | Plano, TX 75093 | Oil Operator | Jun 2026 |
| 1553 | Avid Energy Assets LLC | Midland, TX 79708 | Oil & Gas Operator | Jun 2026 |
| 1554 | Avighna Energy Inc | Sugar Land, TX 77487 | Oil & Gas Operator | Jan 2019 |
| 1555 | Avips Petroleum, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jun 1996 |
| 1556 | Aviva America, Inc. | | Oil & Gas Operator | Nov 2013 |
| 1557 | Avoca Farms LTD | Avoca, NY 14809 | Gas Operator | Dec 2024 |
| 1558 | Avon Energy Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 1996 |
| 1559 | Avondale Operating Co | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2019 |
| 1560 | Avra Oil Co | Dallas, TX 75248 | Oil & Gas Operator | Jun 2026 |
| 1561 | Aw Hembree Co | Shawnee, OK 74802-1725 | Oil & Gas Operator | Feb 2026 |
| 1562 | Aw Tipka Oil & Gas Inc | Dover, OH 44622 | Oil & Gas Operator | Dec 2025 |
| 1563 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Jun 2026 |
| 1564 | Ax Operating, L.L.C. | | Oil & Gas Operator | Jul 2018 |
| 1565 | Axem Resources I | | Oil Operator | Aug 1995 |
| 1566 | Axem Resources Inc | Denver, CO 80202-4617 | Oil & Gas Operator | Jul 2013 |
| 1567 | Axeon Energy Operations LLC | Evergreen, CO 80439-7624 | Oil Operator | Jul 2015 |
| 1568 | Axia Energy II LLC | HGHLNDS Ranch, CO 80129 | Oil & Gas Operator | Jan 2020 |
| 1569 | Axia Energy III LLC | Highlands Ranch, CO 80129 | Oil & Gas Operator | Feb 2026 |
| 1570 | Axia Energy LLC | Hghlands Ranch, CO 80129-2258 | Oil & Gas Operator | Apr 2015 |
| 1571 | Axio Production Company, L.P. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2006 |
| 1572 | Axiom Energy LLC | Park City, UT 84098 | Oil Operator | Feb 2010 |
| 1573 | Axiom Tep, LLC | | Oil & Gas Operator | May 2015 |
| 1574 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Jun 2026 |
| 1575 | Axis Exploration LLC | | Oil & Gas Operator | Feb 2026 |
| 1576 | Axis Onshore, LLC | | Oil & Gas Operator | Apr 2008 |
| 1577 | Axis Onshore, LP | | Oil & Gas Operator | Dec 2010 |
| 1578 | Axis Petroleum Co. | | Oil & Gas Operator | Dec 2022 |
| 1579 | Axp Energy, Inc | Lexington, KY 40509 | Oil & Gas Operator | Dec 2023 |
| 1580 | Axtel Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Jun 2026 |
| 1581 | Aycox Robert D | Healdton, OK 73438 | Oil Operator | Sep 2022 |
| 1582 | Ayer, Robert & Ann | Hartford, KY 42347 | Oil Operator | Dec 2024 |
| 1583 | Ayers Oil Co. | Crystal City, TX 78839 | Oil & Gas Operator | Sep 1995 |
| 1584 | Ayers, R.B. | Sidney, TX 76474 | Oil & Gas Operator | Apr 2003 |
| 1585 | Aylward Drilling | | Oil & Gas Operator | Dec 1986 |
| 1586 | Ayres, C. D. | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2026 |
| 1587 | Ayres, Joe D. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2004 |
| 1588 | Azalea Oil Company LLC | Castle Rock, CO 80108 | Oil Operator | Mar 2026 |
| 1589 | Azar Marsha | Chicago, IL 60618 | Oil Operator | Jan 2025 |
| 1590 | Azariah Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | Mar 2026 |
| 1591 | Azco Opr Co | Phoenix, AZ 85076-0535 | Oil & Gas Operator | Dec 2001 |
| 1592 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 1593 | Azkan Oil & Gas LLC | | Oil Operator | Jul 2024 |
| 1594 | Aztec Drilling & Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2015 |
| 1595 | Aztec Energy, LLC | Wichita Falls, TX 76301 | Oil Operator | Jun 2026 |
| 1596 | Aztec Exploration Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2013 |
| 1597 | Aztec Gas And Oil Corporation | Elephant Butte, NM 87935-0370 | Oil & Gas Operator | Mar 2005 |
| 1598 | Aztec Oil & Gas Company | | Oil & Gas Operator | Mar 1978 |
| 1599 | Aztec Oil & Gas Company "A" | Wichita Falls, TX 76309 | Oil & Gas Operator | Sep 2010 |
| 1600 | Aztec Oil Co | | Oil & Gas Operator | Dec 1977 |