| 1501 | Atkinson WM H Estate | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2001 |
| 1502 | Atkinson, Clifford III | San Antonio, TX 78217 | Oil & Gas Operator | Dec 1996 |
| 1503 | Atkinson, Jim | Nocona, TX 76255 | Oil & Gas Operator | Feb 2026 |
| 1504 | Atla Energy Inc | Zanesville, OH 43702-2607 | Oil & Gas Operator | Dec 2003 |
| 1505 | Atlanko Oil & Gas Inc | Tulsa, OK 74135-7846 | Oil & Gas Operator | Nov 2025 |
| 1506 | Atlanta Exploration Co. | | Oil & Gas Operator | Oct 2001 |
| 1507 | Atlantic & Gulf Petroleum Co. | Houston, TX 77002 | Gas Operator | Mar 1991 |
| 1508 | Atlantic Energy Corp Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 1991 |
| 1509 | Atlantic Exploration, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2015 |
| 1510 | Atlantic Oil And Gas Development LLC | Rockledge, FL 32955 | Oil Operator | Dec 2025 |
| 1511 | Atlantic Oil Company | | Oil & Gas Operator | Nov 2025 |
| 1512 | Atlantic Oil Corporation | Denver, CO 80206 | Oil & Gas Operator | Dec 1982 |
| 1513 | Atlantic Operating II, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 1514 | Atlantic Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 1515 | Atlantic Petroleum Co. | | Oil Operator | Mar 2000 |
| 1516 | Atlantic Resources Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 1517 | Atlantic Richfield Company | Houston, TX 77079 | Oil & Gas Operator | Dec 2016 |
| 1518 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2026 |
| 1519 | Atlantis Oil Cor | | Oil Operator | Sep 1989 |
| 1520 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 1521 | Atlas Eagle Ford Oper Co, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | May 2020 |
| 1522 | Atlas Energy Corp | | Oil & Gas Operator | Nov 2005 |
| 1523 | Atlas Energy Corporation (Del.) | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2026 |
| 1524 | Atlas Energy Group Inc | Uniontown, OH 44685-9575 | Oil & Gas Operator | Dec 2011 |
| 1525 | Atlas Fuel Supply, LTD. | Houston, TX 77269 | Oil Operator | Feb 2026 |
| 1526 | Atlas Growth Texas, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 1527 | Atlas Noble LLC | Fort Worth, TX 76116-5423 | Oil & Gas Operator | Jun 2020 |
| 1528 | Atlas Oil & Gas Exploration, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Aug 2003 |
| 1529 | Atlas Oil Co, Inc | | Oil Operator | Dec 2023 |
| 1530 | Atlas Oil Company, LLC | Versailles, KY 40383 | Oil Operator | Dec 2023 |
| 1531 | Atlas Oil Exploration, Inc | | Oil & Gas Operator | Dec 1977 |
| 1532 | Atlas Oil Inc | Oklahoma City, OK 73154-0467 | Oil & Gas Operator | Aug 2008 |
| 1533 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 1534 | Atlas Production Services | | Oil & Gas Operator | Feb 1999 |
| 1535 | Atlas Resources Inc | Coraopolis, PA 15108-0611 | Oil & Gas Operator | Dec 2007 |
| 1536 | Atlas Resources LLC | Pittsburgh, PA 15275-1033 | Oil & Gas Operator | Jun 2018 |
| 1537 | Atls Production Company LLC | Fort Worth, TX 76102-7426 | Gas Operator | Sep 2020 |
| 1538 | Atmic, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2008 |
| 1539 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 1540 | Atnipp, H. L. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 1541 | Atoka Energy LLC | Gainesville, TX 76241 | Oil & Gas Operator | Feb 2026 |
| 1542 | Atoka Operating Permian, LLC | Addison, TX 75001 | Oil & Gas Operator | Sep 2023 |
| 1543 | Atoka Operating, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Feb 2026 |
| 1544 | Atomic Oil & Gas LLC | Lakewood, CO 80228 | Oil & Gas Operator | Dec 2012 |
| 1545 | Atp Oil & Gas Corporation | Houston, TX 77027 | Oil & Gas Operator | Jun 2008 |
| 1546 | Atr Energy Corp | Dallas, TX 75313 | Oil Operator | Oct 2025 |
| 1547 | Atropos Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 1548 | Atropos Production Corporation | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 1549 | Attaway Energy Group, Inc. | | Oil & Gas Operator | Aug 1995 |
| 1550 | Atteberry Engineering | Edmond, OK 73013-6624 | Oil & Gas Operator | Mar 2008 |
| 1551 | Attica Central School District | Attica, NY 14011 | Gas Operator | Dec 2024 |
| 1552 | Attica Gas Ventu | | Oil & Gas Operator | Dec 1995 |
| 1553 | Atwa Energy Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 1996 |
| 1554 | Atwell Oil & Gas, Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Feb 2026 |
| 1555 | Atwell Technical Services, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 1556 | Atwell, David L. | Duncan, OK 73533 | Oil & Gas Operator | Jul 2003 |
| 1557 | Atwell, Harold | | Gas Operator | Dec 2023 |
| 1558 | Atwood Energy Inc | Port Washington, OH 43837-9214 | Oil & Gas Operator | Dec 1993 |
| 1559 | Atwood Resources Inc | Houston, TX 72151 | Oil & Gas Operator | Dec 1993 |
| 1560 | Atx Energy Partners LLC | Austin, TX 78716 | Oil & Gas Operator | Dec 2025 |
| 1561 | Auburn Enlarged Central School District | Auburn, NY 13021 | Gas Operator | Dec 2024 |
| 1562 | Auburn Enterprises, Inc. | Kyle, TX 78640 | Oil & Gas Operator | Aug 2003 |
| 1563 | Auden Oil Inc. | Hardin, TX 77561 | Oil Operator | Feb 2026 |
| 1564 | Audrey Oil & Gas LLC | Pampa, TX 79066 | Oil & Gas Operator | Feb 2026 |
| 1565 | Augerhead Oil LLC | Lewisville, OH 43754 | Oil & Gas Operator | Dec 2024 |
| 1566 | August Oil | Plano, TX 75093 | Oil & Gas Operator | Aug 2003 |
| 1567 | Augusta Oil & Gas | Abilene, TX 79604 | Oil & Gas Operator | Nov 2002 |
| 1568 | Augusta Oil & Gas Inc | Abilene, TX 79604 | Oil & Gas Operator | Dec 2015 |
| 1569 | Augustus Energy Partners LLC | Billings, MT 59102 | Oil & Gas Operator | Oct 2013 |
| 1570 | Augustus Oil And Gas Corporation | Austin, TX 78731 | Oil & Gas Operator | Feb 2026 |
| 1571 | Aunix Operating, LLC | Tomball, TX 77377 | Oil Operator | Feb 2026 |
| 1572 | Aurivos LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 1573 | Auro USA, Inc. | | Oil Operator | Dec 2024 |
| 1574 | Aurora Energy LTD | Traverse City, MI 49684 | Oil & Gas Operator | Dec 2006 |
| 1575 | Aurora Exploration & Prod Co | Whitesboro, TX 76273 | Oil Operator | Feb 2026 |
| 1576 | Aurora Gas LLC. | | Oil & Gas Operator | Dec 2017 |
| 1577 | Aurora Gas, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jan 2000 |
| 1578 | Aurora Operating, LLC | Houston, TX 77010 | Oil Operator | Feb 2026 |
| 1579 | Aurora Power Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Aug 2018 |
| 1580 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 1581 | Aurora USA Development, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 1582 | Aus-Tex Exploration, Inc | | Oil & Gas Operator | Dec 2025 |
| 1583 | Ausanka Oil Operations | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 1584 | Ausco Texas Exploration, LLC | Bastrop, TX 78602 | Oil & Gas Operator | Feb 2026 |
| 1585 | Ausland Production Company | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 1586 | Ausmus & Clark Oil | | Oil Operator | Jul 2022 |
| 1587 | Auster Oil And Gas, Inc. | | Oil & Gas Operator | Mar 1989 |
| 1588 | Auster Oil And Gas, Inc. Et Al | | Oil & Gas Operator | May 2001 |
| 1589 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 1590 | Austin E. Stewart | | Oil & Gas Operator | Feb 1979 |
| 1591 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Feb 2026 |
| 1592 | Austin Gas Compa | | Gas Operator | Jun 1983 |
| 1593 | Austin Minerals Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Feb 2026 |
| 1594 | Austin Oil Company | | Oil & Gas Operator | Dec 2000 |
| 1595 | Austin Operating, LLC. | Chicago, IL 60622 | Oil Operator | Feb 2026 |
| 1596 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 1597 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 1598 | Austin Resources Oper Company | Houston, TX 77019 | Gas Operator | Mar 1999 |
| 1599 | Austin Ridge Energy Corporation | Houston, TX 77224 | Oil & Gas Operator | Feb 2026 |
| 1600 | Austin Robert L | Stafford, KS 67578 | Oil & Gas Operator | Dec 1999 |