| 1501 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 1502 | Asher Tip Corporation | Fairfax, OK 74637-0308 | Oil & Gas Operator | Nov 2003 |
| 1503 | Ashford, Jerry | Caney, KS 67333 | Oil Operator | Aug 1992 |
| 1504 | Ashland Exploration | | Oil & Gas Operator | May 1979 |
| 1505 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 1506 | Ashland Exploration Properties Inc | | Gas Operator | Dec 1996 |
| 1507 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2023 |
| 1508 | Ashlawn Corporation | | Oil & Gas Operator | Dec 2008 |
| 1509 | Ashlawn Energy, Inc. | | Oil & Gas Operator | Jul 1995 |
| 1510 | Ashley Jim Company (The) | Broken Arrow, OK 74012 | Oil Operator | Jan 2026 |
| 1511 | Ashley Valley Operating Company LLC | Orem, UT 84097 | Oil & Gas Operator | Oct 2025 |
| 1512 | Ashlock Thomas J | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2015 |
| 1513 | Ashlock True | | Oil Operator | Nov 1987 |
| 1514 | Ashlock, Beryl Roderick | Virgil, KS 66870 | Oil Operator | Dec 2019 |
| 1515 | Ashlock, Edd | Neal, KS 66863 | Oil Operator | Dec 1986 |
| 1516 | Ashlock, Ernest H. | Overland Park, KS 66202 | Oil Operator | Jun 1987 |
| 1517 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2026 |
| 1518 | Ashtola Prod Co | Valley Forge, PA 19482-0858 | Gas Operator | Dec 1986 |
| 1519 | Ashton Oil & Gas, Inc. | | Oil Operator | Jun 1990 |
| 1520 | Ashuca | | Oil Operator | Feb 1998 |
| 1521 | Asioco Inc. | | Oil & Gas Operator | Jan 2018 |
| 1522 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 1523 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 1524 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2026 |
| 1525 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 1526 | Aspen Drilling C | | Oil & Gas Operator | Aug 1988 |
| 1527 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 1528 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 1529 | Aspen Exploration | | Oil & Gas Operator | Jan 1983 |
| 1530 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 1531 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 1532 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 1533 | Aspen Oil & Gas LLC | | Oil Operator | Jul 2014 |
| 1534 | Aspen Oil Inc | Hobbs, NM 88241 | Oil & Gas Operator | Mar 2019 |
| 1535 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Jun 2026 |
| 1536 | Aspen Pumping Service | Artesia, NM 88211 | Oil & Gas Operator | Jan 2009 |
| 1537 | Asphalta LLC | | Oil & Gas Operator | Mar 2026 |
| 1538 | Aspire Exploration LLC | Cleveland, OK 74020-0727 | Oil & Gas Operator | Feb 2015 |
| 1539 | Asseff, George S Oil & Gas Company | | Oil & Gas Operator | Dec 2008 |
| 1540 | Assent Energy Partners, LLC | College Sta, TX 77842 | Oil & Gas Operator | Jun 2026 |
| 1541 | Asset Resources Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2010 |
| 1542 | Assiduous Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Mar 2026 |
| 1543 | Assiniboine & Sioux Tribes | | Oil & Gas Operator | Mar 1997 |
| 1544 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 1545 | Associated Oil & | | Oil Operator | Mar 1986 |
| 1546 | Associated Oil Properties | Agoura Hills, CA 91376 | Oil Operator | Nov 2020 |
| 1547 | Associated Petro | | Oil & Gas Operator | Aug 1994 |
| 1548 | Associated Petro Invest Inc | Stillwater, OK 74076-2346 | Oil & Gas Operator | May 2013 |
| 1549 | Associated Petroleum Consultants, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2013 |
| 1550 | Astarta Springs Sustainable Farms LLC | | Oil & Gas Operator | Dec 2025 |
| 1551 | Astro Corporation | Tulsa, OK 74145 | Oil & Gas Operator | Apr 2007 |
| 1552 | Astro Energy Corporation | Edmond, OK 73083-3607 | Oil & Gas Operator | Sep 2014 |
| 1553 | At Oil & Gas, LLC | Eastland, TX 76448 | Oil & Gas Operator | Jun 2026 |
| 1554 | Atalaya Resources LLC | Tulsa, OK 74103-4361 | Oil & Gas Operator | Dec 2022 |
| 1555 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 1556 | Atasca Resources, Inc. | Houston, TX 77219 | Oil & Gas Operator | Jun 2026 |
| 1557 | Atascosa Exploration, LLC | San Antonio, TX 78209 | Oil Operator | Apr 2020 |
| 1558 | Atc Realty Eight, Inc. | | Oil & Gas Operator | Nov 1988 |
| 1559 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2026 |
| 1560 | Atco Prod. Co., Inc. | Winnie, TX 77665 | Oil & Gas Operator | Nov 2020 |
| 1561 | Atex Exploration & Operating Co. | Whitesboro, TX 76273 | Oil & Gas Operator | Jun 2026 |
| 1562 | Atf Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 1563 | Atha Edward E | Athens, OH 45701 | Oil & Gas Operator | Dec 1987 |
| 1564 | Athabasca Energy Corporation | Simonton, TX 77476 | Oil & Gas Operator | Dec 2017 |
| 1565 | Athan Inc | Edmond, OK 73013-6628 | Oil & Gas Operator | Mar 2026 |
| 1566 | Athanor Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 1567 | Athena Energy LLC | Toronto, ON M5E 1W7 | Gas Operator | Jan 2011 |
| 1568 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Jun 2026 |
| 1569 | Athena Resources, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Jun 2026 |
| 1570 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 1571 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 1572 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 1573 | Atinum Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 1574 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 1575 | Atkins Oil L.C. | Conroe, TX 77303 | Oil Operator | Jun 2026 |
| 1576 | Atkins Production | | Oil Operator | Dec 2008 |
| 1577 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 1578 | Atkinson J V | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 1579 | Atkinson Operations LLC | Three Rivers, TX 78071 | Oil Operator | Jun 2026 |
| 1580 | Atkinson WM H Estate | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2001 |
| 1581 | Atkinson, Jim | Nocona, TX 76255 | Oil & Gas Operator | Jun 2026 |
| 1582 | Atla Energy Inc | Zanesville, OH 43702-2607 | Oil & Gas Operator | Dec 2003 |
| 1583 | Atlanko Oil & Gas Inc | Tulsa, OK 74135-7846 | Oil & Gas Operator | Jan 2026 |
| 1584 | Atlanta Exploration Co. | | Oil & Gas Operator | Oct 2001 |
| 1585 | Atlantic & Gulf Petroleum Co. | Houston, TX 77002 | Gas Operator | Mar 1991 |
| 1586 | Atlantic Energy Corp Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 1991 |
| 1587 | Atlantic Exploration, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2015 |
| 1588 | Atlantic Oil And Gas Development LLC | Rockledge, FL 32955 | Oil Operator | Dec 2025 |
| 1589 | Atlantic Oil Company | | Oil & Gas Operator | Dec 2025 |
| 1590 | Atlantic Oil Corporation | Denver, CO 80206 | Oil & Gas Operator | Dec 1982 |
| 1591 | Atlantic Operating II, LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 1592 | Atlantic Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 1593 | Atlantic Petroleum Co. | | Oil Operator | Mar 2000 |
| 1594 | Atlantic Resources Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 1595 | Atlantic Richfield Company | Houston, TX 77079 | Oil & Gas Operator | Dec 2016 |
| 1596 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2026 |
| 1597 | Atlantis Oil Cor | | Oil Operator | Sep 1989 |
| 1598 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 1599 | Atlas Eagle Ford Oper Co, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | May 2020 |
| 1600 | Atlas Energy Corp | | Oil & Gas Operator | Nov 2005 |