| 1501 | Atteberry Engineering | Edmond, OK 73013-6624 | Oil & Gas Operator | Mar 2008 |
| 1502 | Attica Central School District | Attica, NY 14011 | Gas Operator | Dec 2023 |
| 1503 | Attica Gas Ventu | | Oil & Gas Operator | Dec 1995 |
| 1504 | Atwa Energy Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 1996 |
| 1505 | Atwell Oil & Gas, Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Jun 2025 |
| 1506 | Atwell Technical Services, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 1507 | Atwell, David L. | Duncan, OK 73533 | Oil & Gas Operator | Jul 2003 |
| 1508 | Atwell, Harold | | Gas Operator | Dec 2023 |
| 1509 | Atwood Energy Inc | Port Washington, OH 43837-9214-9214 | Oil & Gas Operator | Dec 1993 |
| 1510 | Atwood Resources Inc | Houston, TX 72151-89-89 | Oil & Gas Operator | Dec 1993 |
| 1511 | Atx Energy Partners LLC | Austin, TX 78716 | Oil & Gas Operator | Apr 2025 |
| 1512 | Auburn Enlarged Central School District | Auburn, NY 13021 | Gas Operator | Dec 2023 |
| 1513 | Auburn Enterprises, Inc. | Kyle, TX 78640 | Oil & Gas Operator | Aug 2003 |
| 1514 | Auden Oil Inc. | Hardin, TX 77561 | Oil Operator | Jun 2025 |
| 1515 | Audrey Oil & Gas LLC | Pampa, TX 79066 | Oil & Gas Operator | Jun 2025 |
| 1516 | Augerhead Oil LLC | Lewisville, OH 43754 | Oil & Gas Operator | Dec 2024 |
| 1517 | August Oil | Plano, TX 75093 | Oil & Gas Operator | Aug 2003 |
| 1518 | Augusta Oil & Gas | Abilene, TX 79604 | Oil & Gas Operator | Nov 2002 |
| 1519 | Augusta Oil & Gas Inc | Abilene, TX 79604 | Oil & Gas Operator | Dec 2015 |
| 1520 | Augustus Energy Partners LLC | Billings, MT 59102 | Oil & Gas Operator | Feb 2014 |
| 1521 | Augustus Energy Resources LLC | | Oil & Gas Operator | Jun 2018 |
| 1522 | Augustus Oil And Gas Corporation | Austin, TX 78731 | Oil & Gas Operator | Jun 2025 |
| 1523 | Aunix Operating, LLC | Tomball, TX 77377 | Oil Operator | Jun 2025 |
| 1524 | Aurivos LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 1525 | Auro USA, Inc. | | Oil Operator | Dec 2024 |
| 1526 | Aurora Energy LTD | Traverse City, MI 49684 | Oil & Gas Operator | Dec 2006 |
| 1527 | Aurora Exploration & Prod Co | Whitesboro, TX 76273 | Oil Operator | Jun 2025 |
| 1528 | Aurora Gas LLC. | | Oil & Gas Operator | Dec 2017 |
| 1529 | Aurora Gas, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jan 2000 |
| 1530 | Aurora Operating, LLC | Houston, TX 77010 | Oil Operator | Jun 2025 |
| 1531 | Aurora Power Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Aug 2018 |
| 1532 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2025 |
| 1533 | Aurora USA Development, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 1534 | Aus-Tex Exploration Inc | | Oil & Gas Operator | Apr 2025 |
| 1535 | Ausanka Oil Operations | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 1536 | Ausland Production Company | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 1537 | Ausmus & Clark Oil | | Oil Operator | Jul 2022 |
| 1538 | Auster Oil And Gas, Inc. | | Oil & Gas Operator | Mar 1989 |
| 1539 | Auster Oil And Gas, Inc. Et Al | | Oil & Gas Operator | May 2001 |
| 1540 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 1541 | Austin E. Stewart | | Oil & Gas Operator | Feb 1979 |
| 1542 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jun 2025 |
| 1543 | Austin Minerals Inc. | Austin, TX 78720 | Oil & Gas Operator | Jun 2025 |
| 1544 | Austin Oil Company | | Oil & Gas Operator | Dec 2000 |
| 1545 | Austin Operating, LLC. | Chicago, IL 60622 | Oil Operator | Jun 2025 |
| 1546 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 1547 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 1548 | Austin Resources Oper Company | Houston, TX 77019 | Gas Operator | Mar 1999 |
| 1549 | Austin Ridge Energy Corporation | Houston, TX 77224 | Oil & Gas Operator | Jun 2025 |
| 1550 | Austin, Chas W | | Oil Operator | Jan 2009 |
| 1551 | Austin, Dewey | Burkburnett, TX 76354 | Oil & Gas Operator | Nov 1996 |
| 1552 | Austin, John F. | Baton Rouge, LA 70879 | Oil Operator | May 1992 |
| 1553 | Austin, Robert E. | Miami, OK 74354 | Oil Operator | Dec 1995 |
| 1554 | Austin, Robert L. | Stafford, KS 67578 | Oil & Gas Operator | Dec 1999 |
| 1555 | Austral Oil & Exploration, Inc | | Oil & Gas Operator | Jun 2004 |
| 1556 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 1557 | Australis TMS Inc. | | Oil & Gas Operator | Feb 2025 |
| 1558 | Auten Operating Company, Inc. | Houston, TX 77242 | Oil & Gas Operator | May 1998 |
| 1559 | Auterra Operating, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Jun 2025 |
| 1560 | Autry C. Stephens | Midland, TX 79701 | Oil & Gas Operator | Dec 2001 |
| 1561 | Autry Producing Co. | Cisco, TX 76437 | Oil & Gas Operator | Aug 2008 |
| 1562 | Autry Producing Inc. | Cisco, TX 76437 | Oil Operator | Jun 2025 |
| 1563 | Autry, Martin | Seguin, TX 78155 | Oil Operator | Jun 2025 |
| 1564 | Autumn Energy LLC | Andrews, TX 79714 | Oil Operator | Aug 2017 |
| 1565 | Autumn Energy Operating | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 1566 | Autumn Exploration LTD | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2015 |
| 1567 | Autumn Ridge Energy LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2021 |
| 1568 | Autumn Ridge Enterprises LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2017 |
| 1569 | Av-Tech Resources Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2022 |
| 1570 | Ava Gas Corp | Columbus, OH 43215 | Oil & Gas Operator | Dec 2013 |
| 1571 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Jun 2025 |
| 1572 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jun 2025 |
| 1573 | Avalon Energy Corporation | | Oil & Gas Operator | Jul 1990 |
| 1574 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |
| 1575 | Avalon Operating LLC | Tulsa, OK 74119-5401 | Oil & Gas Operator | Mar 2025 |
| 1576 | Avalon TX Operating, LLC | Andrews, TX 79714 | Oil & Gas Operator | Jan 2023 |
| 1577 | Avant Jack E | Skiatook, OK 74070 | Oil Operator | Jan 2013 |
| 1578 | Avant Operating, LLC | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 1579 | Avanti Exploration La, LLC | | Oil & Gas Operator | Nov 2024 |
| 1580 | Avatar Energy LLC | Dallas, TX 75220-2230 | Oil & Gas Operator | Jul 2016 |
| 1581 | Aven Gas & Oil Inc | Oklahoma City, OK 73113-0491 | Oil & Gas Operator | Nov 2021 |
| 1582 | Averill, W. M. Inc. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2003 |
| 1583 | Avers Harvey G Energy Expl | | Oil & Gas Operator | May 2013 |
| 1584 | Avery Cheryl L | Clarion, PA 16214-7624 | Gas Operator | Dec 2024 |
| 1585 | Avery Oil & Gas, L.P. | Buena VIsta, CO 81211 | Gas Operator | Dec 2006 |
| 1586 | Avery, Irving W. | Buena VIsta, CO 81211 | Oil & Gas Operator | Mar 2008 |
| 1587 | Avian Tech International, Inc. | Euless, TX 76040 | Oil & Gas Operator | Apr 1995 |
| 1588 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 1589 | Avighna Energy Inc | Sugar Land, TX 77487 | Oil & Gas Operator | Jan 2019 |
| 1590 | Avips Petroleum, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jun 1996 |
| 1591 | Aviva America, Inc. | | Oil & Gas Operator | Nov 2013 |
| 1592 | Avoca Farms LTD | Avoca, NY 14809 | Gas Operator | Dec 2023 |
| 1593 | Avon Energy Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 1996 |
| 1594 | Avondale Operating Co | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2019 |
| 1595 | Avra Oil Co | Dallas, TX 75248 | Oil & Gas Operator | Jun 2025 |
| 1596 | Aw Hembree Co | Shawnee, OK 74802-1725 | Oil & Gas Operator | Feb 2025 |
| 1597 | Aw Tipka Oil & Gas Inc | Dover, OH 44622 | Oil & Gas Operator | Dec 2024 |
| 1598 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Jun 2025 |
| 1599 | Ax Operating, L.L.C. | | Oil & Gas Operator | Jul 2018 |
| 1600 | Axem Resources I | | Oil Operator | Aug 1995 |