| 1501 | Asamera Oil Us Inc | Denver, CO 80201 | Oil & Gas Operator | Jul 1985 |
| 1502 | Asante Operating Company, LLC | Austin, TX 78703 | Oil Operator | Sep 2025 |
| 1503 | Ascent Energy, Inc | McKinney, TX 75069 | Oil & Gas Operator | Nov 2008 |
| 1504 | Ascent Energy, LLC. | Parker, CO 80134 | Oil & Gas Operator | Jul 2023 |
| 1505 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 1506 | Ascent Resources - Marcellus, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2021 |
| 1507 | Ascent Resources Utica LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 1508 | Ascot Oils, Inc. | | Oil & Gas Operator | Jul 1993 |
| 1509 | Asg Holdings LLC | Colorado Springs, CO 80907 | Oil Operator | Nov 2009 |
| 1510 | Ash Donald D Oil | | Oil & Gas Operator | Feb 1986 |
| 1511 | Ash Exploration, Inc. | | Oil & Gas Operator | Apr 2010 |
| 1512 | Ash, Wiley R., Jr. | Andover, KS 67002 | Oil & Gas Operator | Mar 1990 |
| 1513 | Ash-Bie Oil Co | Ellis, KS 67637 | Oil Operator | Nov 1998 |
| 1514 | Ashbrook Oil Co. | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2020 |
| 1515 | Ashby, Andrew M. | Golden, CO 80401 | Oil & Gas Operator | Jul 1998 |
| 1516 | Ashcraft James C | Frazeysburg, OH 43822 | Oil Operator | Dec 1997 |
| 1517 | Ashe Oil Company | Scio, NY 14880 | Oil Operator | Dec 2024 |
| 1518 | Ashe Road Properties L.P. | | Oil & Gas Operator | Dec 2009 |
| 1519 | Asher Associates Inc | Centennial, CO 80112 | Oil & Gas Operator | Aug 2016 |
| 1520 | Asher Enterprises LTD. Co. | Denton, TX 76210 | Oil & Gas Operator | Nov 2023 |
| 1521 | Asher Oil Co | Artesia, NM 88210 | Oil & Gas Operator | Aug 1995 |
| 1522 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 1523 | Asher Tip Corporation | Fairfax, OK 74637-0308 | Oil & Gas Operator | Nov 2003 |
| 1524 | Ashford, Jerry | Caney, KS 67333 | Oil Operator | Aug 1992 |
| 1525 | Ashland Exploration | | Oil & Gas Operator | May 1979 |
| 1526 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 1527 | Ashland Exploration Properties Inc | | Gas Operator | Dec 1996 |
| 1528 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2023 |
| 1529 | Ashlawn Corporation | | Oil & Gas Operator | Dec 2008 |
| 1530 | Ashlawn Energy, Inc. | | Oil & Gas Operator | Jul 1995 |
| 1531 | Ashley Valley Operating Company LLC | Orem, UT 84097 | Oil & Gas Operator | Jun 2025 |
| 1532 | Ashley, Jim Company | Broken Arrow, OK 74012 | Oil Operator | Feb 2025 |
| 1533 | Ashlock Thomas J | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2015 |
| 1534 | Ashlock True | | Oil Operator | Nov 1987 |
| 1535 | Ashlock, Beryl Roderick | Virgil, KS 66870 | Oil Operator | Dec 2019 |
| 1536 | Ashlock, Edd | Neal, KS 66863 | Oil Operator | Dec 1986 |
| 1537 | Ashlock, Ernest H. | Overland Park, KS 66202 | Oil Operator | Jun 1987 |
| 1538 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2025 |
| 1539 | Ashtola Prod Co | Valley Forge, PA 19482-0858 | Gas Operator | Dec 1986 |
| 1540 | Ashton Oil & Gas, Inc. | | Oil Operator | Jun 1990 |
| 1541 | Ashuca | | Oil Operator | Feb 1998 |
| 1542 | Asioco Inc. | | Oil & Gas Operator | Jan 2018 |
| 1543 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 1544 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 1545 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 1546 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 1547 | Aspen Drilling C | | Oil & Gas Operator | Aug 1988 |
| 1548 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 1549 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 1550 | Aspen Exploration | | Oil & Gas Operator | Jan 1983 |
| 1551 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 1552 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 1553 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 1554 | Aspen Oil & Gas LLC | | Oil Operator | Jul 2014 |
| 1555 | Aspen Oil Inc | Hobbs, NM 88241 | Oil & Gas Operator | Mar 2019 |
| 1556 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2025 |
| 1557 | Aspen Pumping Service | Artesia, NM 88211 | Oil & Gas Operator | Jan 2009 |
| 1558 | Asphalta LLC | | Oil & Gas Operator | Jul 2025 |
| 1559 | Aspire Exploration LLC | Cleveland, OK 74020-0727 | Oil & Gas Operator | Feb 2015 |
| 1560 | Asseff, George S Oil & Gas Company | | Oil & Gas Operator | Dec 2008 |
| 1561 | Assent Energy Partners, LLC | College Sta, TX 77840 | Oil & Gas Operator | Sep 2025 |
| 1562 | Asset Resources Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2010 |
| 1563 | Assiduous Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Jun 2025 |
| 1564 | Assiniboine & Sioux Tribes | | Oil & Gas Operator | Mar 1997 |
| 1565 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 1566 | Associated Oil & | | Oil Operator | Mar 1986 |
| 1567 | Associated Oil Properties | Agoura Hills, CA 91376 | Oil Operator | Nov 2020 |
| 1568 | Associated Petro | | Oil & Gas Operator | Aug 1994 |
| 1569 | Associated Petro Invest Inc | Stillwater, OK 74076-2346 | Oil & Gas Operator | May 2013 |
| 1570 | Associated Petroleum Consultants, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2013 |
| 1571 | Astarta Springs Sustainable Farms LLC | | Oil & Gas Operator | Jun 2025 |
| 1572 | Astro Corporation | Tulsa, OK 74145 | Oil & Gas Operator | Apr 2007 |
| 1573 | Astro Energy Corporation | Edmond, OK 73083-3607 | Oil & Gas Operator | Sep 2014 |
| 1574 | At Oil & Gas, LLC | Eastland, TX 76448 | Oil & Gas Operator | Sep 2025 |
| 1575 | Atalaya Resources LLC | Tulsa, OK 74103-4361 | Oil & Gas Operator | Dec 2022 |
| 1576 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 1577 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Sep 2025 |
| 1578 | Atascosa Exploration, LLC | San Antonio, TX 78209 | Oil Operator | Apr 2020 |
| 1579 | Atc Realty Eight, Inc. | | Oil & Gas Operator | Nov 1988 |
| 1580 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2025 |
| 1581 | Atco Prod. Co., Inc. | Winnie, TX 77665 | Oil & Gas Operator | Nov 2020 |
| 1582 | Atex Exploration & Operating Co. | Whitesboro, TX 76273 | Oil & Gas Operator | Sep 2025 |
| 1583 | Atf Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 1584 | Atha Edward E | Athens, OH 45701 | Oil & Gas Operator | Dec 1987 |
| 1585 | Athabasca Energy Corporation | Simonton, TX 77476 | Oil & Gas Operator | Dec 2017 |
| 1586 | Athan Inc | Edmond, OK 73013-6628 | Oil & Gas Operator | Jun 2025 |
| 1587 | Athanor Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 1588 | Athena Energy LLC | Toronto, ON M5E 1W7 | Gas Operator | Jan 2011 |
| 1589 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Sep 2025 |
| 1590 | Athena Resources, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Sep 2025 |
| 1591 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 1592 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 1593 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 1594 | Atinum Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 1595 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 1596 | Atkins Oil L.C. | Conroe, TX 77303 | Oil Operator | Sep 2025 |
| 1597 | Atkins Production | | Oil Operator | Dec 2008 |
| 1598 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 1599 | Atkinson J V | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 1600 | Atkinson Operations LLC | Three Rivers, TX 78071 | Oil Operator | Sep 2025 |