| 1501 | Arrowhead Petrol | | Oil & Gas Operator | Feb 1992 |
| 1502 | Arrowhead Petroleum Of Kansas, Inc. | Wellington, KS 67152 | Oil & Gas Operator | Oct 2004 |
| 1503 | Arrowhead Productions, LP | Fort Worth, TX 76109 | Oil & Gas Operator | Dec 2025 |
| 1504 | Arrowhead Resources USA LTD | | Oil & Gas Operator | Dec 1992 |
| 1505 | Arrowhead Resources, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 1506 | Arrowood Production Inc | Cross Plains, TX 76443 | Oil & Gas Operator | Mar 2008 |
| 1507 | Arroyo Petroleum | Wichita, KS 67205 | Oil Operator | Mar 2001 |
| 1508 | Arsenal Energy USA Inc. | | Oil & Gas Operator | Aug 2016 |
| 1509 | Arsenal Resources LLC | Wexford, PA 15090 | Oil & Gas Operator | Dec 2021 |
| 1510 | Art Machin & Associates, Inc. | | Oil & Gas Operator | Jul 1997 |
| 1511 | Artex Energy Group LLC | Marietta, OH 45750-5362 | Oil & Gas Operator | Jun 2022 |
| 1512 | Artex Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 1513 | Arthur Arnold | | Oil Operator | Dec 1991 |
| 1514 | Arthur J. Arding Jr. | | Gas Operator | Dec 1995 |
| 1515 | Arthur McAdams | | Oil & Gas Operator | Oct 2025 |
| 1516 | Artra Resources Corp. | | Oil & Gas Operator | Sep 1990 |
| 1517 | Artzberger-Johnson | | Oil & Gas Operator | Mar 1978 |
| 1518 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Oct 2025 |
| 1519 | Aruba Petroleum, LTD. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 1520 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 1521 | Arxana Oil & Gas Company, LLC | | Oil & Gas Operator | Jun 1998 |
| 1522 | Ary, J. Kirk | Midland, TX 79708 | Oil & Gas Operator | Jun 1993 |
| 1523 | Arya Resources, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 1524 | Arysta Lifescience North America LLC | Cary, NC 27513 | Oil & Gas Operator | Dec 2024 |
| 1525 | Arzie, Gerald & Judith And Barankovich, Ronald | Pulaski, NY 13142 | Gas Operator | Dec 2024 |
| 1526 | Asa Energy Corp | | Oil & Gas Operator | Jun 1984 |
| 1527 | Asa Oil & Gas, Inc. | Brady, TX 76825 | Oil & Gas Operator | Dec 2025 |
| 1528 | Asamera Oil Us Inc | Denver, CO 80201 | Oil & Gas Operator | Jul 1985 |
| 1529 | Asante Operating Company, LLC | Austin, TX 78703 | Oil Operator | Dec 2025 |
| 1530 | Ascent Energy, Inc | McKinney, TX 75069 | Oil & Gas Operator | Nov 2008 |
| 1531 | Ascent Energy, LLC. | Parker, CO 80134 | Oil & Gas Operator | Jul 2023 |
| 1532 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 1533 | Ascent Resources - Marcellus, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2021 |
| 1534 | Ascent Resources Utica LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Sep 2025 |
| 1535 | Ascot Oils, Inc. | | Oil & Gas Operator | Jul 1993 |
| 1536 | Asg Holdings LLC | Colorado Springs, CO 80907 | Oil Operator | Nov 2009 |
| 1537 | Ash Donald D Oil | | Oil & Gas Operator | Feb 1986 |
| 1538 | Ash Exploration, Inc. | | Oil & Gas Operator | Apr 2010 |
| 1539 | Ash, Wiley R., Jr. | Andover, KS 67002 | Oil & Gas Operator | Mar 1990 |
| 1540 | Ash-Bie Oil Co | Ellis, KS 67637 | Oil Operator | Nov 1998 |
| 1541 | Ashbrook Oil Co. | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2020 |
| 1542 | Ashby, Andrew M. | Golden, CO 80401 | Oil & Gas Operator | Jul 1998 |
| 1543 | Ashcraft James C | Frazeysburg, OH 43822 | Oil Operator | Dec 1997 |
| 1544 | Ashe Oil Company | Scio, NY 14880 | Oil Operator | Dec 2024 |
| 1545 | Ashe Road Properties L.P. | | Oil & Gas Operator | Dec 2009 |
| 1546 | Asher Associates Inc | Centennial, CO 80112 | Oil & Gas Operator | Aug 2016 |
| 1547 | Asher Enterprises LTD. Co. | Denton, TX 76210 | Oil & Gas Operator | Nov 2023 |
| 1548 | Asher Oil Co | Artesia, NM 88210 | Oil & Gas Operator | Aug 1995 |
| 1549 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 1550 | Asher Tip Corporation | Fairfax, OK 74637-0308 | Oil & Gas Operator | Nov 2003 |
| 1551 | Ashford, Jerry | Caney, KS 67333 | Oil Operator | Aug 1992 |
| 1552 | Ashland Exploration | | Oil & Gas Operator | May 1979 |
| 1553 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 1554 | Ashland Exploration Properties Inc | | Gas Operator | Dec 1996 |
| 1555 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2023 |
| 1556 | Ashlawn Corporation | | Oil & Gas Operator | Dec 2008 |
| 1557 | Ashlawn Energy, Inc. | | Oil & Gas Operator | Jul 1995 |
| 1558 | Ashley Jim Company (The) | Broken Arrow, OK 74012 | Oil Operator | Jun 2025 |
| 1559 | Ashley Valley Operating Company LLC | Orem, UT 84097 | Oil & Gas Operator | Oct 2025 |
| 1560 | Ashlock Thomas J | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2015 |
| 1561 | Ashlock True | | Oil Operator | Nov 1987 |
| 1562 | Ashlock, Beryl Roderick | Virgil, KS 66870 | Oil Operator | Dec 2019 |
| 1563 | Ashlock, Edd | Neal, KS 66863 | Oil Operator | Dec 1986 |
| 1564 | Ashlock, Ernest H. | Overland Park, KS 66202 | Oil Operator | Jun 1987 |
| 1565 | Ashlyn Energy Corp. | Plano, TX 75086 | Gas Operator | Jul 1995 |
| 1566 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2025 |
| 1567 | Ashtola Prod Co | Valley Forge, PA 19482-0858 | Gas Operator | Dec 1986 |
| 1568 | Ashton Oil & Gas, Inc. | | Oil Operator | Jun 1990 |
| 1569 | Ashuca | | Oil Operator | Feb 1998 |
| 1570 | Asioco Inc. | | Oil & Gas Operator | Jan 2018 |
| 1571 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 1572 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 1573 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 1574 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 1575 | Aspen Drilling C | | Oil & Gas Operator | Aug 1988 |
| 1576 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 1577 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 1578 | Aspen Exploration | | Oil & Gas Operator | Jan 1983 |
| 1579 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 1580 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 1581 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 1582 | Aspen Oil & Gas LLC | | Oil Operator | Jul 2014 |
| 1583 | Aspen Oil Inc | Hobbs, NM 88241 | Oil & Gas Operator | Mar 2019 |
| 1584 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2025 |
| 1585 | Aspen Pumping Service | Artesia, NM 88211 | Oil & Gas Operator | Jan 2009 |
| 1586 | Asphalta LLC | | Oil & Gas Operator | Nov 2025 |
| 1587 | Aspire Exploration LLC | Cleveland, OK 74020-0727 | Oil & Gas Operator | Feb 2015 |
| 1588 | Asseff, George S Oil & Gas Company | | Oil & Gas Operator | Dec 2008 |
| 1589 | Assent Energy Partners, LLC | College Sta, TX 77840 | Oil & Gas Operator | Dec 2025 |
| 1590 | Asset Resources Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2010 |
| 1591 | Assiduous Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Nov 2025 |
| 1592 | Assiniboine & Sioux Tribes | | Oil & Gas Operator | Mar 1997 |
| 1593 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 1594 | Associated Oil & | | Oil Operator | Mar 1986 |
| 1595 | Associated Oil Properties | Agoura Hills, CA 91376 | Oil Operator | Nov 2020 |
| 1596 | Associated Petro | | Oil & Gas Operator | Aug 1994 |
| 1597 | Associated Petro Invest Inc | Stillwater, OK 74076-2346 | Oil & Gas Operator | May 2013 |
| 1598 | Associated Petroleum Consultants, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2013 |
| 1599 | Astarta Springs Sustainable Farms LLC | | Oil & Gas Operator | Oct 2025 |
| 1600 | Astin Corp. | Dallas, TX 75229 | Oil & Gas Operator | Sep 1994 |